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Eye Care Glossary

Welcome to our Eye Library, our comprehensive library of vision related information. We’ve compiled dozens of helpful eye care and information articles that will assist you in investigating all aspects of your vision. Performance Eyecare is located in St. Louis near Creve Coeur and in Swansea & Alton, IL.

Children's Vision

Vision is arguably the most important of the five senses; it plays a crucial role throughout childhood and beyond. Yet many parents don’t understand how vision helps their children develop appropriately. Use these articles to proactively care for your child’s eyes, spot potential trouble, and maximize the opportunity for crisp, convenient and healthy vision.


  • Vision Therapy for Children
    An individualized program of eye exercises and other methods can treat non-refractive vision problems such as eye alignment and lazy eye.
  • Children’s Vision – FAQs
    How often should your child’s eyes be examined? What’s the difference between a school vision screening and a comprehensive eye exam? and more.
  • Your Infant’s Visual Development
    Knowing the expected milestones of your baby’s vision development during their first year of life can ensure your child is seeing properly and enjoying their world to the fullest.
  • Are Contact Lenses a Good Choice for Kids?
    Contact lenses offer advantages in the areas of sports and self-esteem. But when is your child old enough for contacts?
  • Learning-Related Vision Problems
    The first step is to make sure your child has 20/20 eyesight. But there are other, less obvious learning-related vision issues you should know about as well.
  • Controlling Nearsightedness in Children
    Certain types of contact lenses and eyeglasses may play a role in slowing the progression of myopia, or nearsightedness.
  • How to Tell if Your Child Needs Glasses
    Keeping your children happy and healthy is a parent’s number one concern. It is easy to tell when your child feels ill and needs to see a doctor, but how do you know if your child is having difficulties seeing?
  • How to Get Your Child to Wear Glasses?
    Everyone remembers how difficult it was to be a child, especially when you had something that made you stand out and others made fun of. So what do you do if your child needs glasses and they refuse to wear them?
  • Back To School!
    Sure, it’s only July. Kids aren’t thinking about school yet, but as a parent you should be. That’s why now is the perfect time to bring your child in for an eye exam before school starts.
  • Children’s Glasses
    With the kids going back to school, it’s time to bring them in for an eye exam and pick out any necessary eyewear to help him or her succeed this school year.
  • Eye Protection This Halloween
    Halloween is the ideal holiday for kids, especially because candy and costumes are involved. It’s also the ideal holiday for something frightening to happen, such as permanent damage to their eyesight.
  • Your Infant’s Visual Development
    Knowing the expected milestones of your baby’s vision development during their first year of life can ensure your child is seeing properly and enjoying their world to the fullest.
Contact Lenses

Today there are more convenient and healthy contact lense choices than ever before. Whatever your vision challenge, it can probably be met with an array of specialty contact lenses for individual vision needs.

If you need correction for presbyopia but dislike the idea of bifocal eyeglasses, you have many contact lens options.

These rigid contact lenses aren’t as popular or well-known as soft contact lenses, but they offer the advantages of durability, crisp vision and high oxygen permeability.

Challenges such as astigmatism, presbyopia, keratoconus and dry eyes need not be a barrier to contact lens wear, but they do require more time and patience.

What if you could wear contacts while sleeping, and then see clearly during the day without them? It might sound like magic, but it’s a time-tested reality called ortho-k.

I can’t wear soft contacts; I have astigmatism. This once-true statement is now simply a myth.

When you first get contact lenses, it can be very difficult to take them in and out and keep them clean. You are putting a foreign object on your eye, so it is expected that some people may struggle more that others. Below are instructions and videos that will help ease the nervousness and stress about caring and wearing your new contact lenses.

Progressive addition lenses (also called progressives or PALs) are the most popular multifocal lenses sold in the United States. Find out why, by reading more!

May can be the worst month for allergy sufferers with the flowers and trees still coming to life from the particularly harsh winter.

At Performance Eyecare, we have several hundred contact lenses in our office and can routinely fit our contact lens patients the same day.

If you’re looking to create a subtle, bold or anywhere in between look, getting colored contact lenses might be the way to go.

Some of us have been told we can’t wear contact lenses because of an irregular cornea or other problems. If this is true for you or someone you know, you may want to get a second opinion and ask the eye doctors at Performance Eyecare about scleral contact lenses.

Can a contact lens really get stuck behind your eye? The answer might surprise you.


Whether or not you require vision correction, sunglasses can add an element of comfort and enhanced performance to your activities, while helping you look great.

For clear, comfortable vision outdoors or when driving, prescription sunglasses eliminate glare which can reduce vision and cause eye strain.

Think fashion and function when choosing the right shades for you.

Activity-specific lenses can enhance whatever activities you enjoy.

Because children spend so much time outdoors in direct sunlight, they need sun protection even more than adults.

Looking to go to the beach? Stand out from the crowd with the latest summer trends in sunglasses. Come see what is “in” at Performance Eyecare.

Even when it’s not summer, it’s important to continue to protect your eyes with UV-blocking sunglasses, such as ones that you can find at Performance Eyecare.

The chilly winter weather may be lingering around for now, but soon enough the warmer spring and summer air will be pushing in. That also means the spring and summer eyeglass and sunglasses style will be coming into fruition, as well.

We rub suntan lotion on our bodies to protect our skin from the sun’s harmful rays, but most of us forget to wear our sunglasses or don’t realize the benefits sunglasses provide our eyes.

Eye Exams

Seeing clearly is just one part of your overall eye health. It’s important to have regular eye exams whether or not you wear glasses or contacts, and even if your vision is sharp. The articles below explain what problems can be spotted with an eye exam, what’s involved in a comprehensive exam, and special considerations for kids and contacts.

Catching problems in their early stages can prevent vision loss. An eye exam can do this by catching things you haven’t yet noticed.

Make the most of your exams by knowing how often to get them, and what information to bring with you.

Learn what common tests and procedures to expect during a routine eye exam.

A routine exam won’t provide some of the measurements and testing that are required to determine if your eyes are suitable for contact lens wear, and to generate your contact lens Rx.

When should your child have their first eye exam? Plus, learn about special considerations for developing eyes.

To maximize your eligibility and coverage, Performance Eyecare participates in most medical policy and vision insurance plans.To maximize your eligibility and coverage, Performance Eyecare participates in most medical policy and vision insurance plans.

Did you know August is National Eye Exam month? It’s a nice reminder as we get ready to send the kids back to school that eye health is important learning for children, and even for adults.

We understand the word “exam” can add some unnecessary stress to your life, so we wanted to share with you what a routine comprehensive eye exam usually consists of.

Anytime is the right time for scheduling an eye exam, but scheduling one at the beginning of each year may be more helpful to remember.

Vision Surgery

Tired of wearing glasses or contact lenses? Today, several surgical methods can correct your eyesight and, in most cases, give you the freedom of seeing well without corrective lenses.

Start here for an overview of the different types of surgery to correct myopia, hyperopia and astigmatism; and the merits and drawbacks of each.

It’s the most popular vision correction surgery, by far. Learn what to expect before, during and after the procedure.

Complications from LASIK are few, but they do happen. It’s important to understand the risks, and how to minimize them.

Successful LASIK surgeons get that way from experience and the ability to screen out poor candidates for the procedure. Here’s the list of what makes you a good candidate.

A number of relatively new procedures are addressing the age-related decrease in ability to focus on near objects that was once correctable only with bifocals.

These small lenses or optical devices are inserted into the cornea to alter its shape and correct vision problems.

Sometimes because of disease or injury, the cornea becomes so damaged that problems cannot be corrected with eyeglasses, contacts, or refractive surgery such as LASIK.


The struggle between fashion and function is officially declared a tie! Never before have eyeglass frames been offered in so many stylish choices. Yet, you’ll be amazed at how many options are at your fingertips to help you see well, and protect your vision.

Get a quick overview of the types of eyeglass frames and lenses available to you.

Which frame material is right for you? Learn about the different types of metal and plastic, and the advantages of each.

It’s no longer a simple choice between glass and plastic. Today’s lenses offer many options to help you see and look your best.

With nearly unlimited choices, how can you choose which frame fits your style and wardrobe, and feels as good as it looks?

Check out our tips for the best fit and comfort, as well as advice on style trends

One pair of glasses won’t suit your every need. Learn about how function-specific eyewear can help with driving and computer use, improve your game and protect your eyes at work and play.

Did you know that Performance Eyecare is one of the only eye centers that customizes Eye prescriptions in Scuba Diving Masks in our St. Louis, MO & Swansea, IL area?

We get it. You want to see, but you want to be fashionable while wearing your new glasses. So what should you look for when trying to pick out the best frame?

Just because you are older doesn’t mean you have to settle for the grandma look when it comes to glasses. Take a look at these tips to consider the next time you pair a new set of frames.

Style is important in every setting, which is why it’s important to choose frames that not only feel good, but also look good.

Performance Eyecare has the perfect glasses to fit your style and personality.

Just the thought of buying eyeglasses for your child can make you want to pull your hair out.

Do you use the same pair of glasses for everything you do, or do you own a pair of specialty eyeglasses designed for specific tasks? Find out what we have to say about eyeglasses and maintaining everyday life.

Did you know October is considered Computer Learning Month? We’re not here to teach you how to use the computer better, but to inform you of computer vision syndrome, especially for children who are likely to use the computer more often.

We understand that teenagers can have extremely picky taste when it comes to anything, but especially when it involves fashion. This is where our opticians come in handy! We can help your teenager choose the most updated, trendy eyeglasses.

Looking for that ‘wow’ factor? Make a fashion statement with your eyeglasses with help using these makeup tips.


Eye problems can range from mild to severe; some are chronic, while others may resolve on their own, never to appear again. The articles below will give you a basic understanding of some of these problems and their implications. The cardinal rule is if your eyes don’t look good, feel good or see well, you should visit your doctor.

Commonly called “lazy eye” amblyopia can be treated successfully if detected early enough in childhood.

Often mistakenly called “a stigmatism” this common vision problem can be corrected with eyeglasses, contact lenses or refractive surgery.

Red, swollen eyelids and crusty debris at the base of your eyelashes are signs you may have blepharitis.

Cataracts are a common cause of vision loss after age 55. Surgical correction is safe and effective, and offers several new options for better vision.

AIDS or other diseases that affect your immune system can increase your risk of serious eye problems from cytomegalovirus (CMV) infection.

People with serious vision problems from an eye injury or disease affecting the front surface of the eye can often regain vision with a cornea transplant.

If undetected or uncontrolled with medication, diabetes can cause serious vision loss, even blindness.

Dry eye syndrome is a common condition, especially in women over age 40. Many treatment options are available.

Are you bothered by red, itchy eyes? You may have allergies.

“Floaters” are usually normal and harmless. But if you notice a sudden increase in floaters or floaters accompanied by flashes of light, see your eye doctor immediately.

Glaucoma is a variety of disorders in the eye that can lead to loss of vision and even blindness. The most common type of glaucoma is caused by a gradual and painless rise of pressure inside the eye.

Also called farsightedness, hyperopia is a common vision problem that can cause headaches, eyestrain and trouble reading.

This eye disease causes the cornea to grow thinner and bulge forward in an irregular cone-shape. Treatment options range from gas permeable contact lenses to a cornea transplant.

This age-related problem is the leading cause of vision loss and blindness in Americans age 65 and older.

Also called nearsightedness, myopia is a very common vision problem, affecting up to one-third of the U.S. population.

You’ve heard of high blood pressure, but what about high eye pressure?

Pingueculae and pterygia are funny-looking words for growths on the surface of your eye.

This acute and contagious form of conjunctivitis is particularly common among preschoolers and school-age children.

Are you over age 40 and starting to hold reading material at arm’s length to see it clearly? You probably have presbyopia.

Ptosis is a drooping eyelid. Surgery is usually required to correct this problem.

A detached retina is a medical emergency. Learn the warning signs of a retinal detachment and what you can do to avoid permanent vision loss.

These inherited disorders, commonly abbreviated as RP, cause progressive peripheral vision loss, night blindness and central vision loss.

Don’t let the cold, snow or cloudy weather fool you, snow reflects UV radiation from the sun and this puts your face and eyes at an extreme risk.

This common problem is simply an infected lid gland. Learn how to prevent and treat styes.

This inflammatory eye disease can cause permanent vision loss if not promptly treated.

Can using someone else’s prescription glasses harm your eyes? Will sitting too close to the television ruin your eyes? Will crossing your eyes too long make them permanently stick like that?! Everyone has heard many eye rumors, many from your parents growing up. The questions everyone has is, are they true? Below is a list of eye myths and facts. I bet you will be shocked by some of them. Don’t be afraid to share this with your parents!

We all get things in our eye, watery eyes and even a little eye pain or discomfort. Do you know how to tell when an eye symptom is serious or just annoying? People tend to believe that eye infections are only common among children.

Many allergens (substances that can evoke an allergic response) are in the air, where they come in contact with your eyes and nose.

Computers are an essential part of many people’s day. Whether it be for work or leisure, we tend to stare at our screens for long periods of time which can cause computer eye strain.

Vision Over 40

If you are among the 85 million Baby Boomers in the United States and Canada (born between 1946 and 1964), you’ve probably noticed your eyes have changed. Most notably, presbyopia – the normal, age-related loss of near focusing ability – usually becomes a problem in our 40’s, requiring new vision correction solutions. Learn about measures you can take to keep seeing clearly for years to come.

Are you over 40 and struggling to read with your contacts? Try multi-focal contact lenses.

If you are over 40, already wear glasses, and your “arms aren’t long enough” to read a newspaper, it’s time for multifocal lenses.

“One-size-fits-all” doesn’t apply when it comes to eyewear. The best eyeglass lens solutions for work and play are those tailored specifically to your vision needs.

There is no need to advertise your age with bifocals or trifocals-choose progressive lenses.

All about reading glasses, including why custom-made readers are superior to the pre-made variety from the drugstore.

The risk for dry eye increases with age, especially for women.

After the age of 40, our eyes become less flexible and not as capable of focusing on things up close. This may be why you can’t seem to get that newspaper far enough way to see clearly, even with those bifocals or trifocals.

Are you 40 years old and beginning to experience blurred near vision when reading or working at the computer? You have likely developed presbyopia.

The best way to avoid vision problems to go for annual eye exams as you get older. So what are some of the signs you should look out for?

Vision Over 60

Just as our physical strength decreases with age, our eyes also exhibit an age-related decline in performance – particularly as we reach our 60’s and beyond. Some age-related eye changes are perfectly normal, but others may signal a disease process. It’s important to recognize signs and symptoms, and perhaps even more important to mitigate the effects of aging with some simple and common-sense strategies.

Learn about changes that occur to your eyes and your vision as you grow older – and what you can do to protect your eyesight.

Protect yourself from age-related eye problems and vision loss by following these simple tips.

Vision problems can seriously affect the quality of life of America’s seniors. Learn what you can do to prevent or cope with age-related vision loss.

Sports Vision

Sports eyewear can give you the performance edge you’re seeking for just about any sport. But make sure you get the eye protection you need as well. And after you’re fit for the right eyewear, you might want to take your game up a notch with the same kind of vision training used by professional athletes.

To excel in most sports, you need more than just 20/20 eyesight. A sports vision specialist can help you tune up other visual skills that are important as well.

Sports eyewear does more than just protect your eyes from injury – it offers performance advantages as wel.

The proper spots eyewear will help you see as clearly in the pool and underwater as you do on dry ground.

Enjoy sports to the fullest, with no worries about eye safety. Learn more about the benefits of protective sports eyewear for you and your kids.

Good vision is critical when hunting or using a firearm, so look for the right features when buying “shooting glasses.”

Anyone who has ever played a sport knows how essential eyesight is for performance.
If you are wanting to check that your vision is performing at maximum capacity in your sport, you will want to go through a Sports Visions Workup.

The weather is warming up and many of us will be hitting the links to play a round of golf this spring. Before you take your first swing of the season, make sure you’re wearing the proper golf eyewear.

Are you or your child considering playing a sport? Here are some things to consider to keep your eyes safe before you commit to a sport.

Vision Insurance

It’s true that insurance protects you against unexpected or overwhelming financial obligations. Vision insurance, on the other hand, is a wellness benefit designed to provide routine eye care, prescription eyewear and other vision-related services at a reduced cost. Learn about types of vision plans, and how they work.

Learn about types of plans, coverage and payment options.

According to recent data published in the journal Diabetes Care, over the last decade there has been little to no change in how frequently minority patients with diabetes are seeking annual eye care screenings.

Low Vision

Low vision is the term used to describe reduced eyesight that cannot be fully corrected with eyeglasses, contact lenses or eye surgery. The primary causes of low vision are eye diseases, but low vision also can be inherited or caused by an eye or brain injury.

Any signs of vision loss should prompt a doctor’s visit; if you have a problem that can’t be corrected with eyewear or surgery, low vision aids can help.

Innovative low vision devices for computers can help visually-impaired people stay connected with friends and the online world.

Your Eyes

Your eyes are just as important as your health, so why wouldn’t you take care of them? Read more for educate yourself on things you may not know, tip & other eye facts.

There are seven main parts in the eye that play a role in transmitting information to the brain, detecting light, and focusing. A problem with any of these parts means a problem with your vision.

Ultraviolet rays are a danger to skin and eyes year-round, playing a contributing factor to skin damage, skin cancer and eye disorders such as cataracts.

Nutrition is key for healthy eyes. To find out which nutrients you should be including in your diet for healthy eyes, read more!

Those summer flowers are way past the point of blooming, but why are we still sneezing as if the allergy season just arrived?

Tired of giving the same gifts each year? You should consider giving the gift of proper eyesight to your loved one this holiday season.

The bright winter sun and cold winds can be damaging your eyes. Here are tips to keep them healthy through the harsh winter conditions.

Another year has come and gone and it’s the perfect time to start taking better care of your eyes.

The winter season is the season for colds, which in turn can create a battle against pink eye.

A direct hit to the eye is an obvious reason as to why your eye may hurt, but how do you know why your eye suddenly hurts if you didn’t suffer a direct blow to it?

Whether you have dry eyes, pink eye, red eye or itchiness, there is an eye drop or ointment for relief of these symptoms. But which eye drop or ointment works best for which symptom?

Most spots and floaters are normal, but there is a time when you should be concerned.

Springtime is great for those who love warmer weather, but it can also be a terrible time for those who suffer from allergies.

Which foods can help keep your eyes healthy and reduce your risk of cataracts and age-related macular degeneration?

Big project due? Bills need to be paid? Trying to find a job? These are a few things that can cause stress. That stress can cause other problems to your health including your eyes.

Many of us were told when we were kids to eat our carrots if we want to have healthy eyes. Healthy eyes go beyond just carrots.