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What Exactly is an Eye Chart?

If there’s one aspect of optometry that everyone recognizes, it’s the traditional eye chart, with its rows of big letters on top, which gradually become smaller the farther down you go. This chart is usually known as the Snellen chart.

Yet how much do you really know about this eye chart? Are all eye charts the same? How are these eye charts used? And when were they invented?

Here’s everything you need to know about eye charts and more!

What is an Eye Chart?

An eye chart is one of the tools your eye doctor uses to assess your eyesight. Based on how well you can see various letters on the chart, your optometrist will determine whether you have myopia (nearsightedness), hyperopia (farsightedness), presbyopia (age-related farsightedness) or astigmatism, and will measure the prescription that will give you the clearest, most comfortable vision.

Are All Eye Charts The Same?

There are a number of variations to the standard Snellen eye chart. The one an eye doctor uses depends on the personal needs and abilities of the patient. For example, eye doctors will use charts with pictures or patterns for younger children who may not have learned to read or identify letters and numbers.

There are also certain charts that specifically measure distance vision, while others are better for measuring near vision.

History of the Snellen Eye Chart

The Snellen eye chart was developed by Dutch eye doctor Hermann Snellen in the 1860s. Before this standardized eye chart was developed, each eye doctor had their own chart that they preferred to use.

Having so many different eye charts made it impossible to standardize the vision correction available to patients. Eyeglass makers didn’t receive the defined measurements they needed to accurately design, manufacture and measure the optical prescriptions their patients needed.

For the first time, the Snellen eye chart allowed a person to provide a standardized prescription from any eye care provider they chose to any eyeglass maker, and get the same optical lenses to accurately correct their vision.

How The Snellen Chart Is Used in Eye Exams

The standard Snellen chart displays 11 rows of capital letters, with the first row consisting of a single large letter. The farther down the chart you go, the smaller the letters become.

Your Cherry Hill eye doctor will ask you to look through a phoropter – an instrument used to test individual lenses on each eye during an eye exam – and look at the Snellen chart placed 20 feet away. Your eye doctor will prescribe the lenses that provide you with the clearest and most comfortable vision.

In many offices, where 20 feet of space may not be available, you’ll be asked to view the chart through a mirror. This provides the same visual experience as if you were standing 20 feet away.

If you have 20/20 vision, it means you can see what an average person can see on an eye chart from a distance of 20 feet. On the other hand, if you have 20/40 vision, it means you can only see clearly from 20 feet away what a person with perfect vision can see clearly from 40 feet away.

If you have 20/200 vision, the legal definition of blindness, this means what a person with perfect vision can see from 200 feet away, you can see from 20 feet away.

Does 20/20 Visual Acuity Mean Perfect Vision?

No. While eye chart tests identify refractive errors, they can’t detect signs of visual skill deficiencies or diseases such as glaucoma, cataracts or macular degeneration. These are diagnosed using advanced equipment as part of a comprehensive eye exam with your local Cherry Hill eye doctor. Early diagnosis and treatment of eye conditions are essential to ensuring long-term vision and eye health.

For more information, give us a call at 856-230-7511 or visit us in person at Advanced Vision Consultants, today!

Q&A With Your Local Optometrist

How do you keep your eyes healthy?

You only have one set of eyes – don’t take them for granted!

Make sure to implement the following habits for healthy eyes (and body). These include:

  • Eating a balanced diet rich in fiber, fruits and vegetables
  • Drinking plenty of water to hydrate your body and eyes
  • Not smoking, and avoiding 2nd-hand smoke
  • Wearing sunglasses to protect your eyes from ultraviolet (UV) rays
  • Maintaining normal BMI with regular exercise
  • Regular visits to your eye doctor as recommended

What health conditions can an eye exam detect?

A comprehensive eye exam can often detect certain underlying diseases that can threaten your sight and eye health, such as diabetes, high blood pressure, high cholesterol, tumors, autoimmune conditions and thyroid disorders. This is why having your eyes checked regularly is key. The earlier the diagnosis and treatment, the better the outcome and the higher your quality of life.

Bloodshot Eyes – Should You Be Concerned?

You wake up in the morning ready to start your day, only to discover that your eyes are bloodshot. That might not be surprising if you stayed up late to finish a project, had too many drinks at a party or spent time in a smoke-filled room.

But bloodshot eyes can also signal an underlying eye problem. If your eyes appear red or bloodshot, make an appointment with an eye doctor for a comprehensive eye exam to determine the cause and to receive effective treatment.

Why Do I Have Bloodshot Eyes?

When blood rushes to the front of the eye, the tiny red blood vessels on the white of the eye dilate and become visible. This makes the eyes appear red and irritated.

So why do these blood vessels dilate, causing your eyes to look bloodshot?

Bloodshot eyes tend to be caused by:

  • Dry eyes
  • Irritants such as smoke, pollen and perfume
  • Lack of sleep
  • Excessive alcohol consumption
  • Spending too much time in front of the computer

Bloodshot eyes due to lifestyle and environmental irritants may disappear on their own, or you can try to relieve them with over-the-counter eye drops or liquid tears. Lifestyle changes, such as getting more sleep, cutting down on alcohol intake and limiting screen time can often be helpful. If allergies are the culprit, oral antihistamines and antihistamine eye drops may relieve symptoms.

At other times, underlying problems requiring prompt medical attention can cause your eye’s blood vessels to dilate. The following are some of these medical conditions:

Conjunctivitis

You’ve probably heard of “pink eye.” It’s another name for infectious conjunctivitis – an infection of the conjunctiva, the thin membrane covering the eyelid and the front surface of the eye.

There are two types of infectious conjunctivitis – bacterial and viral.

If your child has conjunctivitis, they’re not alone. About 12% of kids get bacterial conjunctivitis every year. This highly contagious condition affects children and adults. In addition to reddish eyes, the following symptoms are associated with conjunctivitis:

  • Bacterial conjunctivitis – irritated eyes, swollen eyelids, eye discharge, crusty eyelids and excessive tearing
  • Viral conjunctivitis – cold or flu-like symptoms, runny nose, fever, itchy eyes, excessive tearing

If you or your child are experiencing these symptoms, it’s important to schedule a prompt appointment with an eye doctor, who can diagnose whether the conjunctivitis is viral, bacterial or due to allergies.

Depending on the diagnosis, your eye doctor will prescribe antibiotic eye drops or creams to treat bacterial conjunctivitis. The viral form may run its course after a few days, but cold compresses and non-prescription eye drops may provide relief.

Dry Eye Syndrome

If your eyes are chronically bloodshot you may have dry eye syndrome (DES). Signs of DES include:

  • Dry, irritated eyes
  • Burning or stinging eyes
  • Discharge from the eyes
  • Light sensitivity
  • A feeling you have something stuck in your eyes
  • Blurred vision
  • Watery eyes

Dry eye syndrome is most commonly caused by a blockage of the tiny meibomian glands in the eyelids. These glands secrete oil that keeps eye moisture from evaporating too quickly. Without the oil, tears dry fast, leaving your eyes feeling dry, itchy and with a bloodshot appearance.

Too much screen time, aging, certain medications such as antihistamines, and medical conditions such as Sjogren’s syndrome can cause dry eye syndrome.

In addition to any medications or in-office treatments your eye doctor recommends, make sure to get plenty of hydration, take frequent breaks from digital screens and use a humidifier in your home.

Uveitis

In addition to bloodshot eyes, if you also experience blurred vision, see floaters or your eyes feel painful, you may have an eye inflammation called uveitis. The causes of uveitis include:

  • Autoimmune or inflammatory condition
  • Infection
  • Medication side effects
  • Cancer (in rare cases)

Unfortunately, uveitis symptoms can often be mistaken for something less serious. That’s the reason it’s important to get an eye exam if your eyes are bloodshot. Left untreated, uveitis can lead to serious conditions such as retinal scarring, cataracts and vision loss.

Depending on the cause and severity, your eye doctor may treat uveitis with prescription eye drops, steroid pills, injections or eye implants.

Eye Injury

It’s vital that all eye injuries receive immediate eye care from an eye doctor.

Even a minor eye injury can cause a big red blotch to form on the white part of the eye (sclera). The cause is a broken blood vessel or a subconjunctival hemorrhage.

Although the appearance of this blood looks severe, and can make the entire white part of the eye appear bright red, a subconjunctival hemorrhage is usually painless and doesn’t cause vision loss. Any time you notice excessive blood on the eye following an eye injury, schedule an appointment with an eye doctor to assess the health of your eye.

Glaucoma

In rare cases, bloodshot eyes may signal the presence of glaucoma – a leading cause of vision loss and blindness.

While some types of glaucoma don’t show symptoms in the early phases, bloodshot eyes can indicate the type of glaucoma that requires immediate medical care. This disease causes damage to the optic nerve due to excessive pressure within the eye. When this pressure suddenly rises, the eye’s blood vessels become dilated and visible, making the eye appear red.

If you have bloodshot eyes and/or have the following risk factors for glaucoma, immediately schedule an appointment with your eye doctor.

  • Family history of glaucoma
  • Aged 60+
  • African American, Asian or Hispanic
  • Diabetes
  • High blood pressure

Bloodshot Eyes Won’t Go Away?

Talk to Us Any time you notice bloodshot eyes or blood on the front of the eye, don’t wait. Schedule your eye exam with Dr. Isaac at Advanced Vision Consultants in Cherry Hill today.

Q&A With Your Local Optometrist

Can I get bloodshot eyes after LASIK surgery?

LASIK surgery is highly effective minimally invasive laser eye surgery that can correct refractive errors, but like all surgical procedures, it can have side effects. Your eyes may be bloodshot or you could see halos from a few days to three weeks after surgery. Additionally, you may experience other dry eye symptoms. Eye drops and liquid tears can alleviate these symptoms, but if you have any concerns about your eyes following LASIK surgery contact your eye surgeon.

What Should I Expect from a Glaucoma Exam?

If you have a family history and/or other risk factors for glaucoma, and if your eyes look bloodshot, consider scheduling a glaucoma exam. Your eye doctor may perform the following tests:

  • Tonometry – eye pressure test
  • Gonioscopy – to see how fluid is draining out of your eye
  • Vision field test – to examine the functioning of the optic nerve
  • Dilated pupil exam – to detect any damage to the optic nerve
  • Retinal photo or OCT – digital examination of the retina and optic nerve health

6 Top Treatment Options for Presbyopia

Presbyopia is a condition that occurs as a person ages, which causes the lens of the eye to become less elastic. This results in issues with near vision for people 40 years old and over, which can cause difficulties with simple everyday tasks like reading, writing, or working on a computer.

Fortunately, your Cherry Hill eye care team at Advanced Vision Consultants can easily diagnose presbyopia as part of a routine comprehensive eye exam. Once diagnosed, we can offer a number of treatment options to make sure you enjoy your best vision at all times.

Here are six of the most common treatments for presbyopia correction:

Bifocal and Progressive Lens Eyeglasses

Bifocal and progressive lens eyeglasses are far and away the simplest and most commonly prescribed treatment for presbyopia.

A bifocal lens offers two distinct sections in a single lens. The primary section helps correct for distance vision, while the secondary section, usually a much smaller section of the lens, allows for clear near-vision.

Progressive lenses function in a similar manner. However, instead of the distance and near vision sections being in distinct zones, they’re more blended. This offers a more seamless viewing experience, though it can sometimes take longer to get used to.

Contact Lenses

There are two common types of contact lenses when it comes to the treatment of presbyopia with contacts:

Monovision contact lenses come in different prescriptions for each eye; one eye is fitted with a lens for distance vision and one for near vision. This solution may not be for everyone, however, as it can sometimes take some time to get used to.

Multifocal contact lenses work in much the same way that multifocal eyeglasses do. They’re designed to offer clear vision across distance, moderate and near vision. They come in various types, including soft disposable, rigid gas permeable, and hybrid contact lenses.

Corneal Inlays

Corneal inlays are very small implantable lenses that your eye doctor surgically places in the cornea to address issues with presbyopia. There are a few different kinds of corneal inlays currently available. Each of these lenses works in a slightly different way:

Corneal inlays that rely on exploiting the pinhole effect are implanted in the non-dominant eye allowing the lens to extend the patient’s overall range of vision.

Corneal inlays that are made from biocompatible hydrogel are designed to imitate the cornea in your eye. This inlay treats presbyopia in the same way as multifocal contact lenses, changing the curvature of the eye, and altering the way light enters and is focused on the retina.

Monovision LASIK

Although traditional LASIK procedures don’t address presbyopia, certain variations can help reduce symptoms and minimize your reliance on bifocals or reading glasses.

Monovision LASIK is the most widely used surgical correction for presbyopia. It corrects the dominant eye so that you can see better at a distance while leaving the less-dominant eye nearsighted. This relies on the idea that the non-dominant eye is only mildly nearsighted, so it is still able to see things up close without the need for reading glasses.

Refractive Lens Exchange

For refractive lens exchange (RLE), an eye surgeon replaces your eye’s natural lens using an artificial intraocular lens (IOL). The IOL improves near vision and reduces your need for near vision solutions such as reading glasses. There are multiple strategies that can be employed to address your particular case, including different types of lenses in each eye. Speak to your eye doctor to find out what will work best for you.

Eye drops are among the newest solutions for the treatment of presbyopia and are most effective in patients who have just begun to experience symptoms. They are miotic drops, meaning they rely on making the pupil contract to create a “pinhole effect” that mimics the eye’s natural ability to focus. This allows for improved vision close-up in patients with presbyopia.

For more information on how we can help you see your best with presbyopia, contact our Cherry Hill eye care team at Advanced Vision Consultants today!

Q&A

Are multifocal contact lenses difficult to get used to?

Some people will be able to adjust immediately to multifocal contacts, while others may take around a week to adjust. During the adjustment period, you may find that your distance vision is not as crisp as you like, and that you see shadows around some images up-close.

What is the pinhole effect?

The pinhole effect is a method of focusing your vision by causing the pupil to dilate or get smaller. This causes light that is scattered and unfocused to be able to enter your eye, leaving only focused light to enter and reach your retina. This results in sharper, more focused vision.

What to Wear to Protect Your Eyes

Your eyes are among the most important organs in the body when it comes to discovering and interacting with the world around you. Unfortunately, they are also among the most exposed, and vulnerable to damage. That’s why it’s so important to ensure that proper protective gear is worn in places and situations where you might accidentally sustain an eye injury.

Whether it’s participating in sports, working with chemicals while cleaning or in a lab, or working on do-it-yourself projects around the home, it’s important to know what counts as proper protection, and what doesn’t.

Fortunately, our eye doctors at are here to explain.

Do Normal Prescription Glasses Count As Safety Equipment?

In short, no. Prescription glasses are built with materials that are primarily useful in promoting wearer comfort and helping you see better and more clearly.

The kinds of plastics and metals used in the frames are built for comfort, but may not hold up against flying shards of metal and wood.

Likewise, lens materials in prescription eyeglasses are chosen for their ability to be easily shaped and molded to give you optimum vision while minimizing aberrations. This ability to be easily molded does not lend itself well to also being impact-resistant.

Safety equipment gear for the eyes is also built with an extra guard around the sides to protect from flying debris and chemicals from all-around. This extra guard is not present in the vast majority of prescription eyeglasses.

So what IS considered proper safety equipment for protecting your eyes?

Personal Protective Equipment For Protecting Your Eyes

In general, there are three types of accepted safety equipment depending on your particular needs and preferences:

Safety Glasses

are made with shatter-resistant lenses, which are manufactured from materials like propionate plastic or polycarbonate. They also have side shields that help from debris and dust that may enter from the sides of, rather than in front of, the face.

What are safety glasses good for? These glasses are designed to be shatter-resistant and protect the eye from large, physical objects such as wood chips or metal or glass shards that could impact the eye, causing serious injury. Some types of safety glasses also offer laser light filtration, preventing reflections from the laser entering the eye, causing painful retinal burns.

What are safety glasses NOT good for? Safety glasses are not meant for protection from liquids or vapors.

Safety glasses can be purchased with or without prescription lenses and can also be ordered with bifocals.

Safety Goggles

These are another common type of personal protective equipment. They may be vented or non-vented.

Non-vented goggles are used as protection from mists, vapors, fumes, or other airborne hazards that require the eyes to be completely covered.

Vented goggles are meant to protect the eyes from liquid chemicals that pose no danger from vapor or mist. These also have a series of buttons embedded into the plastic that house something called a “baffle plate,” which allows air to pass through, but acts as a blockage so that liquid can’t get in.

Be aware that there are many types of goggles on the market, and some are not meant for certain kinds of work. Common, hardware-store goggles, for example, often have holes drilled into the plastic, which can let vapors and liquids into the mask, making them unfit for laboratory work.

Face Shields

These are actually not meant to be worn as the sole line of protection for your eyes. Rather, they are supplemental protection for the entire face, and goggles worn underneath the face shield block any vapor or liquid which may make it past.

Still not sure what kind of eye protection you need? Come visit our eye care practice to find out more!

At Advanced Vision Consultants, we put your family’s needs first. Talk to us about how we can help you maintain healthy vision. Call us today: 856-230-7511 or book an appointment online to see one of our Cherry Hill eye doctors.

Want to Learn More? Read on!

Why Does Your Eye Doctor Dilate Your Pupils for an Eye Exam?

What Exactly is an Eye Chart?

6 Ways To Maintain Eye Health If You’re Over 50

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Q&A

Do Normal Prescription Glasses Count As Safety Equipment?

In short, no. Prescription glasses are built with materials that are primarily useful in promoting wearer comfort and helping you see better and more clearly. Safety glasses can be purchased with or without prescription lenses and can also be ordered with bifocals. Safety goggles may be vented or non-vented.

What are Non-vented goggles ?

Non-vented goggles are used as protection from mists, vapors, fumes, or other airborne hazards that require the eyes to be completely covered.

9 Signs Your Child Might Need Glasses

It can sometimes be hard to tell if your child is having trouble seeing. That’s because children are often unaware of their own vision problems, and in many cases may not even have the words to describe what they’re seeing.

Though eye and vision problems are very common in school-age children, the signs are often subtle and easy to miss. When these issues go undiagnosed and untreated, a child may have difficulty learning in the classroom and playing sports, among other things. Fortunately, some vision issues can be easily solved with a simple pair of eyeglasses.

Here are 9 subtle signs that your child may need glasses:

1. They struggle with intense near vision activities like homework, computer use, taking exams or reading. They may also avoid distance vision activities such as sports.

2. They have a hard time keeping their place while reading

3. They tilt their head or squint when watching TV or in class

4. They have problems with unusually teary eyes or frequently rub or squint their eyes

5. They complain about eye fatigue and headaches, especially after reading or other vision-intensive activities

6. They may close one eye while reading or watching TV in order to see better

7. They hold books unusually close to their face in order to read

8. They sit very close to TVs or computer screens in order to see better

9. They use their finger to guide their eyes along the page as they read.

If you notice these or any other signs that your child may be experiencing poor vision, it is important to bring them in for a pediatric eye exam as soon as possible.

Pediatric Eye Exams and Eyeglasses

During your child’s eye exam our eye doctor will test for signs of refractive errors such as myopia (nearsightedness), hyperopia (farsightedness) and astigmatism. If your child has a refractive error, our eye doctor will prescribe prescription glasses to correct their vision and help them thrive at school and at home.

School aged students may be prescribed eyeglasses if their eyes have difficulty focusing. The glasses allow the eyes to function better and remove eye strain. These eyeglasses are often only worn when in class, when reading, using a digital screen or during examinations.

For more information on how to tell if your child needs glasses, and how our eye care practice can help, call us at or visit us in person today!

At Advanced Vision Consultants, we put your family's needs first. Talk to us about how we can help you maintain healthy vision. Call us today: 856-230-7511 or book an appointment online to see one of our Cherry Hill eye doctors.

Want to Learn More? Read on!

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Q&A

Can refractive errors cause problems other than poor vision?

Yes. Myopia in childhood has been linked to an increased risk of developing potentially sight-threatening eye conditions later in life. These conditions include glaucoma, macular degeneration and cataracts. Speak to your eye doctor about the best ways to minimize your child’s risk.

Will wearing glasses weaken my child’s vision?

No. Many people mistakenly believe that eyeglasses make your eyes reliant on them, and that this reliance weakens your eyes. Children with refractive errors will experience changes in their vision, even when their nearsightedness, farsightedness or astigmatism isn’t corrected with glasses or contact lenses.

10 Ways to Give Your Eyes Some Love This Valentine’s Day

Valentine’s Day is the time to express your love and appreciation to those you care about most. But it’s also a great opportunity to take the time to pamper yourself — so why not start with your eyes?

Practice these 10 healthy lifestyle habits to help protect your eye health and vision.

1. Be Mindful of the Food You Eat

Fill your plate with fresh fruits and veggies, lean proteins and whole grains. A well-balanced diet is good for your body and can lower your risk of eye disease.

Studies show that foods high in vitamins A, C, E, Omega-3, lutein and zeaxanthin are especially beneficial for promoting eye health.

2. Drink Plenty of Water

Drinking at least eight 8-ounce glasses of water each day will keep your body hydrated and your eyes moist — which is essential for preventing dry eye syndrome. To add some flavor to your water, try adding a splash of lemon juice or swap some of those glasses of water for an herbal tea or other non-caffeinated beverage. Caffeinated drinks have a dehydrating effect, so try to limit your coffee consumption as much as possible.

3. Exercise Regularly

Exercise is widely known for its physical and mental health benefits, but studies show that it can also lower your risk of serious eye conditions and diseases. Cardio exercise in particular has been shown to lower eye pressure and improve blood flow to the retina and optic nerve at the back of the eye. So grab your gym bag and get moving!

4. Don’t Smoke

If you’ve been thinking about quitting, there’s no better time than now. Smoking tobacco significantly raises your risk of developing sight-threatening eye diseases like diabetic retinopathy, cataracts and age-related macular degeneration (AMD), and can also lead to their early development.

Smoking also robs the body of the essential vitamins and minerals it needs to maintain eye health, and contains around 7,000 chemicals that can lead to eye irritation and dry eye.

5. Practice Good Makeup Hygiene

While wearing makeup can accentuate your eyes and make you feel more beautiful, it’s important to note that if not used properly, certain makeup products can adversely affect eye health.

To keep your eyes and vision healthy, make sure to:

  • Clean your brushes and applicators regularly
  • Toss any expired products, or eye makeup you’ve used during an eye infection
  • Only apply makeup to the outer margin of your eyelids
  • Remove your makeup before going to bed
  • Never share makeup or use in-store testers

Following these safety tips will help to lower your risk of eye infections and other serious complications.

6. Wear Sunglasses

Studies show that prolonged UV exposure can damage the eyes and lead to the development of sight-threatening eye conditions, like cataracts, macular degeneration and glaucoma, in the future.

Purchase a pair of stylish sunglasses with 100% UV protection and wear them any time you venture outdoors — the sun’s UV rays can penetrate the clouds and reflect off of snow, sand, water and pavement. So keep a pair of sunglasses next to your front door and a spare pair in your bag or car to ensure you have UV protection wherever you go.

7. Prevent Eye Injuries

About 90% of vision loss from eye injuries can be prevented by wearing the right eye protection.

Protective eyewear like sports goggles or glasses with polycarbonate lenses are designed with sturdy materials that are less likely to break or shatter while you play sports, and can protect your eyes from small particles that fly in the air when you mow the lawn or engage in DIY projects.

8. Learn First Aid for Eye Injuries

Let’s be real, accidents can happen even if we take all the right measures to protect ourselves. But knowing what to do in case of an unexpected eye injury can potentially save you or someone you love from permanent eye damage or vision loss.

Note: Any type of eye injury should be taken seriously, and promptly examined by an eye doctor.

9. Avoid Digital Eye Strain

Prolonged screen time can cause eye strain, dry eyes, blurry vision and headaches — and lead to a condition called digital eye strain, also known as computer vision syndrome.

Avoid symptoms of digital eye strain by limiting screen time as much as possible. If prolonged screen time is unavoidable, practice the 20-20-20 rule: set an alarm on your phone as a reminder to take breaks every 20 minutes to focus on an image at least 20 feet away, for at least 20 seconds.

10. Visit Your Eye Doctor

Regular eye exams are crucial when it comes to maintaining your eye health. With an eye exam, your eye doctor can identify early signs of sight-threatening eye diseases and conditions — enabling earlier treatment and increasing your chances for optimal results.

From all of us at Advanced Vision Consultants in Cherry Hill, we wish you a Happy Valentine’s Day!

At Advanced Vision Consultants, we put your family’s needs first. Talk to us about how we can help you maintain healthy vision. Call us today: 856-230-7511 or book an appointment online to see one of our Cherry Hill eye doctors.

Want to Learn More? Read on!

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Wear Progressive Glasses? Transition To Multifocal Contact Lenses!

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Q&A

What’s the difference between an eye exam and vision screening?

Vision screenings are basic tests of visual acuity, generally conducted by a school nurse or pediatrician. These screenings can’t identify many vision conditions that impact learning or work performance, and are unable to detect ocular health problems.

A comprehensive eye exam, which is performed by an eye doctor, includes tests for visual acuity and functional vision, as well as close examination of the inner and outer structures of the eye.

How often do I need to have an eye exam?

According to the American Optometric Association (AOA), it is important to have your eyes examined every one to two years, depending on your age, whether or not you wear glasses or contacts, your family history of eye disease, and your ocular health to date. Annual eye exams help your eye doctor monitor your eye health and easily identify any changes in your vision.

Why Is My Eyelid Twitching?

What Is An Eyelid Twitch?

Myokymia, more commonly known as an eyelid twitch, occurs when the eyelid muscles spasm uncontrollably. This sensation is generally felt in either the upper or lower eyelid of one eye.

An eyelid twitch can develop for a number of reasons, and can last anywhere from a few moments to several days, depending on the underlying cause.

Eyelid twitches are usually nothing to worry about, though persistent eyelid spasms can signal a more serious underlying condition.

What Causes Eyelid Twitching?

There are a range of factors that could be causing your eyelid to twitch, including:

Stress.

This is the most common cause. Any type of physical or mental stress leads to the release of cortisol, a steroid hormone in the body that acts as a stimulant and puts your body into “flight or fight” mode. It can affect the nervous system in uncharacteristic ways, including making the nerves stimulate your muscles to twitch.

Fatigue.

Have you stayed awake later than usual, or are you juggling work and family commitments? Your eyelid twitch may be a sign that your body is craving a few more hours of rest and shut eye.

Allergies.

Itchy, watery, irritated eyes can cause eyelid spasms.

Dry eyes.

Dry, sore eyes may sometimes lead to an eyelid twitch.

Eye strain.

Eye muscle fatigue from prolonged reading or using a digital device can lead to blurry or double vision, dry eyes, headaches and, sometimes, an eyelid twitch.

Caffeine.

Consuming too much caffeine can over-stimulate your mind and body, including the muscles in your eyes.

Alcohol.

Similar to caffeine, excessive alcohol intake can have stimulating effects on your eye muscles.

Nutrient deficiencies.

According to research, a deficiency in vitamins B12 or D, or magnesium, or other electrolyte imbalance can cause an eyelid twitch.

Blepharospasm.

This rare eye condition is caused by a neurological problem that leads to uncontrollable facial and eyelid spasms that generally worsen over time.These spasms may also cause an increase in blink rate and intensity.

Neurological disease.

Although uncommon, an eyelid twitch can be a symptom of multiple sclerosis (MS), Parkinson’s disease or Bell’s palsy.

How to Stop Your Eye Twitch

  • Schedule an eye exam to find out what may be causing your eyelid twitch. Your eye doctor may prescribe glasses to relieve eye strain, or recommend dry eye treatments, Botox injections or oral medication to treat the underlying problem.
  • Practice stress-relieving activities such as yoga and deep breathing exercises, or simply take some time out of your day to relax.
  • Use eye drops to alleviate eye allergies or dry eye symptoms.
  • Take frequent breaks from the screen and consider wearing computer glasses to reduce eye strain.
  • Limit caffeine and alcohol consumption to determine if these stimulants may be the cause of your eyelid twitch.
  • Speak with your physician to find out if you can benefit from taking nutritional supplements and to rule out a neurological disorder, especially if other symptoms are present.

Although an eye twitch is generally not a cause for concern, if it persists for longer than a few days or you notice any changes to your vision, contact Dr. Isaac at Advanced Vision Consultants today to schedule an eye exam.

Q & A

Frequently Asked Questions with Dr. Daniel H. Isaac

Q: What is dry eye syndrome?

  • A: Dry eye syndrome (DES) is a chronic condition that occurs when your eyes don’t produce enough tears or the quality of your tear film is compromised. This results in a range of symptoms that may include dry, itchy, irritated eyes, and sometimes eye twitches. While mild DES can often be alleviated temporarily with over-the-counter lubricating eye drops, moderate to severe DES generally requires specialized in-office treatments.

Q: How can I relieve eye strain after prolonged screen time?

  • A: Digital eye strain, also known as computer vision syndrome, can cause a host of uncomfortable symptoms, including headaches, eye fatigue, dry eyes and blurry vision. Computer vision syndrome may cause your eyelid to twitch.If limiting screen time isn’t practical on a daily basis, try to follow the 20-20-20 rule: every 20 minutes, look at something around 20 feet away for at least 20 seconds. It is also important to remember to blink frequently and to close your eyes completely. Lastly, speak to your optometrist about wearing computer glasses while you work, as they are designed to eliminate glare from the screen, and reduce eye strain.

Quality Frames For Prescription Eyeglasses & Computer Glasses In Deptford, New Jersey. Visit Advanced Vision Consultants for an eye exam and eyeglasses that match your style.

What’s the Link Between Sleep and Glaucoma?

Sleep is usually a time for restoration and healing, but the way we sleep, how much we sleep and conditions like apnea can increase your chances of developing a serious eye condition: glaucoma.

Glaucoma is a sight-threatening optic nerve disease that generally affects people over 50 and, in its early stages, usually presents no symptoms until permanent vision loss has occurred.

This is why it’s essential to have your annual eye exam, especially if you’re 50 or older or at high risk of developing glaucoma. Regular check-ups enable your eye doctor to detect any eye problems, including glaucoma, early on. This can maximize the effectiveness of eye disease treatment and management.

If you’re due for your annual eye evaluation, schedule your eye exam with at in today.

Sleep and Risk Factors for Glaucoma

The quality and amount of our sleep and the way we sleep can increase our risk of developing glaucoma due to the following factors:

Eye Pressure and Glaucoma

The pressure within our eyes is affected by the amount of aqueous fluid and its ability to drain from the eyes. The aqueous fluid doesn’t drain efficiently when we lie flat on our back. The lack of drainage due to positioning during sleep can increase ocular pressure, which can strain the optic nerve and increase the risk of glaucoma.

Blood Pressure and Glaucoma

When we sleep, our blood pressure decreases. This is often good for people who suffer from hypertension because it takes some pressure off the cardiovascular system. However, long periods of low blood pressure, or hypotension, during sleep has been shown to exacerbate glaucoma symptoms.

Sleep Apnea and Glaucoma

Sleep apnea is marked by the occasional or frequent cessation of breathing during sleep. Usually, the person is unaware that they have sleep apnea, and only a partner or someone else who sleeps in the same room will notice that they make choking or gasping sounds as they stop breathing.

These periods of interrupted breathing can lessen the flow of oxygen and damage the optic nerve. There is an observable link between people who have sleep apnea and those who suffer from glaucoma, which may suggest a causal connection. The risk of people with sleep apnea developing glaucoma could be as high as 10 times the average. Individuals with sleep apnea should consult with their primary care physician, who can suggest lifestyle changes and devices such as oral appliances to help treat the condition.

Glaucoma and the Amount of Sleep

Too little or too much sleep can affect general health and contribute to eye problems. As mentioned above, extended periods of lying down can increase pressure on the optic nerve and contribute to the development of glaucoma. Yet too little sleep causes fatigue and has been associated with field vision loss.

According to a National Health and Nutrition Examination Survey (2005-2008), those who slept 10 hours or more a night had triple the risk of developing glaucoma compared to people who slept only 7 hours a night. Getting three hours of sleep a night tripled the risk of field vision loss.

Among other lifestyle glaucoma prevention tips, such as maintaining a healthy weight and not smoking, getting the right amount of sleep — not too much or too little — are important steps towards preventing optic nerve problems.

How Glaucoma Interferes with Sleep

Not only does the amount and way we sleep affect the development and progression of glaucoma. This optic nerve disease can interfere with our sleep. This occurs because the communication between the retina’s photosensitive cells and the hypothalamus — the part of the brain that contains the circadian clock that regulates sleep — is disrupted in glaucoma patients.

The hypothalamus no longer sends a message to the pineal gland to secrete melatonin and induce sleep at the proper time. The result: people with glaucoma may also experience sleep disturbances.

Risk factors for Glaucoma

Since many glaucoma patients do not experience symptoms prior to diagnosis, it is essential to undergo regular eye exams, especially for those considered at higher risk:

  • Aged 50 or older
  • Have a family history of glaucoma
  • Hypertension, diabetes, sickle cell anemia, heart disease
  • Are African American, Asian or Hispanic
  • Have corneas that thin at the center
  • Eye injury or prior eye surgery
  • High myopia (severe nearsightedness)
  • Take corticosteroids such as eye drops, pills or creams

How is Glaucoma Detected?

A digital eye exam maps out the eye with 3D full color images allowing your eye doctor to detect any problems early.

Retinal imaging can detect glaucoma and show optic nerve damage. Eye dilation is occasionally required before the imaging of the eye to enable your optometrist to more easily see the inside of your eye.

To facilitate the early diagnosis and treatment of glaucoma and other eye diseases and conditions, schedule an appointment with at in today.

At Advanced Vision Consultants, we put your family’s needs first. Talk to us about how we can help you maintain healthy vision. Call us today: 856-230-7511 or book an appointment online to see one of our Cherry Hill eye doctors.

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Q&A

What are the symptoms of glaucoma?

Symptoms vary depending on the type of glaucoma.

Open-angle glaucoma results from a lack of drainage of fluid from the eye. It generally has no obvious symptoms in its early phases. In its later stages, it presents with:

  • Blind spots and patches in the central or peripheral vision
  • Tunnel vision

Acute angle-closure glaucoma occurs when there is a sudden buildup of fluid pressure in the aqueous humor. Symptoms include:

  • Headaches
  • Pain in the eyes
  • Blurry vision
  • Nausea
  • Eye redness
  • Appearance of halos

What Causes a Feeling of Pressure Behind the Eye?

Glaucoma is often caused by pressure on the optic nerve. However, a feeling of pressure behind the eye is generally only felt with closed-angle glaucoma.

An excessive amount of fluid in the eye, called the aqueous humor or a sudden blockage to proper drainage causes a buildup and increased pressure on the optic nerve. Drainage of the aqueous humor is through the trabecular meshwork, which is located where the cornea and the iris meet.

Eye Vitamins: Can They Prevent or Treat Glaucoma?

Some initial studies have shown a potential link between Vitamin A and Vitamin C and a protective effect related to glaucoma. However, a systematic review of the literature on vitamins and glaucoma (Nutrients, March 2018), concludes that these studies are inconclusive and more research, including randomized clinical trials, are needed to establish any clear link between specific vitamins and preventing or treating glaucoma.

5 Ways to Protect and Improve Your Child’s Eyesight

Your child’s vision is their primary window into the world around them. Keeping their eyesight healthy is an important part of allowing them to experience life to the fullest.

Here are 5 tips on how to protect and improve your child’s eye health:

1. Take them to the eye doctor for routine eye exams

One of the most important take-aways from any article you read on the subject of keeping your child’s vision and eyes healthy, is the need to keep up with routine comprehensive eye exams.

Although your kid’s school may perform vision screenings, these tests can only detect the most basic issues, such as myopia (nearsightedness) or severe amblyopia. They are not equipped to check for eye diseases that can affect your child’s long-term ocular health, or binocular vision disorders that can hinder their ability to learn.

Our Cherry Hill eye doctor will be able to perform a comprehensive eye exam to check for the presence of these and other conditions. If ocular diseases or vision disorders are detected, your eye doctor will have the equipment and expertise to properly treat them.

2. Limit their screen time

Screens are an ever-present part of our lives. Children can spend hours every day texting, playing video games, watching television, and more. It is all-too-easy to spend way too much time on these digital devices, causing symptoms such as:

  • Fatigue
  • Blurry vision
  • Dry eye
  • Headaches
  • Eyestrain

Excessive blue light, like the kind that comes from these screens, interferes with sleep and is also thought to increase the risk of macular degeneration later in life.

To prevent symptoms and protect your child’s long-term vision health, limit their screen time, when possible, to approximately one hour, and devices should be turned off a few hours before bedtime to allow your child to wind down.

3. Encourage them to eat healthy foods and get exercise

As with every part of the body, a healthy lifestyle can go a long way in ensuring the long-term health of your child’s eyes.

Eating foods that are rich in omega-3 fatty acids is a great way to promote eye health. Good sources include fish such as salmon and herring. For vegans and others who don’t eat fish, flax seeds, chia seeds and walnuts are also a great option.

Leafy greens and fruits are also important, as they’re high in vitamins A, C and E, which are all important for the development and maintenance of healthy vision.

Along with a healthy diet, you should encourage your child to get up and exercise. Physical activity is good for the whole body, and that includes the eyes.

Bonus points if you can get your child outside, as sunlight and outdoor play have been shown to slow or even prevent the development of myopia. Just make sure your child wears sunglasses and a sun hat — UV rays have a cumulative effect that could lead to eye diseases like macular degeneration later in life.

4. Help them avoid eye injuries

Eye injuries are an all-too-common occurrence, especially among children.

If you have little ones at home, make sure that paints, cleaners and other dangerous chemicals and irritants are put away somewhere safe. If these ever get into their eyes, they can cause severe damage to your child’s visual system, including permanent loss of vision.

For contact and ball/puck sports, ensure your child wears the right eyewear to protect their eyes from accidental impacts or pokes. Helmets should also be worn where the sport warrants it, to prevent concussions and other head injuries that can have an effect on vision.

5. Reduce eye infections

Even small, common infections such as pink eye can have an impact on your child’s vision.

Hands are some of the most bacteria-filled parts of our bodies. Your child should learn not to touch their eyes with their unwashed hands, as this is the primary way of introducing germs to the eye that may result in infection.

On a similar note, if you have contact lens wearers, be sure to teach them to wash their hands each and every time they put in or take out their contact lenses. They should also learn to store and clean their lenses strictly according to their eye doctor‘s instructions and should change lenses according to their intended schedule. Daily contacts should be changed daily, monthly contacts, monthly.

For more information on how best to protect and improve your child’s eyesight, contact Advanced Vision Consultants in Cherry Hill today.

Q&A

Frequently Asked Questions with Dr. Daniel H. Isaac,

Q: Can I rely on the vision screenings at my child’s school to catch vision and eye health issues?

  • A: No. School-based vision screenings check for basic visual acuity. Even if your child has perfect 20/20 vision, there may still be issues with visual skills or undetected eye diseases that these types of screenings are not equipped to catch.It is important not to rely on school vision screenings as a replacement for an annual comprehensive eye exam with your local optometrist. During these visits, your eye doctor will be able to assess your child for vision skills such as:

    Eye teaming ability
    Convergence and divergence skills
    Tracking and focusing
    Visual accommodation

    They will also be able to diagnose and treat conditions such as:

    Amblyopia
    Strabismus
    (Rarely) pediatric glaucoma or cataracts

    These and other conditions can only be diagnosed and treated by a trained optometrist as part of a comprehensive eye exam.

Q: Can vision problems be misdiagnosed as ADHD/ADD?

  • A: It is unfortunately common for learning-related vision problems to go undetected. These vision problems can often mimic the symptoms of ADD/ADHD, leading to misdiagnosis and mistaken treatment.As many as 1 out of every 4 school-age children suffers from some form of visual dysfunction. If not properly treated, a child may struggle throughout their entire school career, harming their learning and possibly their long-term self-confidence.

Quality Frames For Prescription Eyeglasses & Computer Glasses In Deptford, New Jersey. Visit Advanced Vision Consultants for an eye exam and eyeglasses that match your style.

How Pregnancy Can Affect Your Eyesight

Pregnancy can impact almost every part of a woman’s body and health — including her eyes. In fact, an estimated 14% of pregnant women report experiencing visual changes during pregnancy that usually resolve on their own within a couple of months after giving birth.

Knowing the different visual symptoms that can present when you’re expecting can help alert you to potential underlying health concerns that your physician may need to address.

Normal Visual Changes During Pregnancy

Blurred Vision

Blurred vision is the most common visual symptom that pregnant women may experience. Hormonal fluctuations are usually to blame for the temporary decrease in visual acuity, and your eyesight will likely return to normal soon after giving birth.

The influx of pregnancy hormones causes fluid retention in some areas of the body and can cause the cornea to thicken slightly. As a result, the light entering the eye isn’t focused accurately and vision may be blurred.

Less commonly, blurred vision can signal gestational diabetes, a pregnancy complication affecting 6-9% of pregnant women. The rise in blood sugar level impacts the focusing lens of the eye, leading to blurry vision. If you are diagnosed with diabetes, including gestational diabetes, it’s a good idea to book an eye exam to monitor for retinal changes.

Blurred vision is also a common side effect of dry eye syndrome, a condition characterized by tears that don’t adequately lubricate the eyes, which can be brought on or exacerbated by pregnancy.

Eye Dryness

Pregnancy hormones can cause a reduction in the amount of tears your eyes produce or affect the quality of the tears. These changes can affect a woman throughout her entire pregnancy, but studies show that eye dryness is particularly common in the last trimester. For this reason, some women find it difficult to wear contact lenses in their third trimester and temporarily switch to glasses.

Eye Puffiness

Yet another body part that swells during pregnancy: the eyelids and tissues around the eyes.

Pregnancy-related water retention may cause your eyelids to appear puffier than during your pre-pregnancy days. You may also notice darker areas under the eyes. If your puffy eyes bother you, try limiting your salt and caffeine intake, as they can worsen the problem.

Visual Changes That May Indicate a Problem

The following visual changes warrant a prompt call to your eye doctor or obstetrician to rule out any underlying complications.

Flashes or floaters

Seeing stars during pregnancy can signal high blood pressure, which is associated with preeclampsia — a serious medical condition that requires close monitoring by your physician and possible treatment.

It’s crucial to have your blood pressure monitored throughout your pregnancy, as preeclampsia can potentially endanger the life of mother and child, as well as damage the cornea and retina.

Temporary vision loss

Temporary vision loss is concerning for pregnant and non-pregnant individuals. Vision loss is another warning sign of preeclampsia, so contact your doctor promptly if you suddenly lose any portion of your visual field.

Sensitivity to light

Light-sensitivity can either be a normal side effect of fluid retention in the eye, or it can signal dangerously high blood pressure and preeclampsia.

How We Can Help

At ​​Advanced Vision Consultants, our goal is to keep your vision and eyes healthy throughout your pregnancy and beyond. If you experience any visual symptoms, we can help by thoroughly examining your eyes to determine the underlying cause and provide you with guidance on what next steps to take.

Pregnancy is a wonderful time, when self care should be at the forefront — and that includes comprehensive eye care.

To schedule an eye exam or learn more about our eye care services, call Advanced Vision Consultants in Cherry Hill today!

Q&A

Frequently Asked Questions with Dr. Daniel H. Isaac

Q: Why are regular eye exams important?

  • A: Having your eyes evaluated by an optometrist on a regular basis is crucial for detecting early signs of eye diseases and changes in your prescription, including during pregnancy. Many serious eye diseases don’t cause any noticeable symptoms until they’ve progressed to late stages, when damage to vision may be irreversible. Whether or not you wear glasses or contact lenses for vision correction, ask your optometrist about how often to schedule a routine eye exam.

Q: Will my baby need an eye exam after birth?

  • A: According to the American Optometric Association and the Canadian Association of Optometrists, babies should have an eye exam within the first 6-12 months of life, even in the absence of noticeable vision problems. Healthy vision is a significant part of healthy overall development, so be sure not to skip your baby’s eye exams!

Quality Frames For Prescription Eyeglasses & Computer Glasses In Marlton, New Jersey. Visit Advanced Vision Consultants for an eye exam and eyeglasses that match your style.