An overview of Refractive Errors

Refractive errors are a type of vision problem that makes it hard to see clearly.They happen when the shape of your eye keeps light from focusing correctly on your retina(a light-sensitive layer of tissue in the back of your eye).

Refractive errors are the most common type of vision problem. More than 150 millionAmericans have a refractive error — but many don’t know that they could be seeing better.That’s why eye exams are so important.

If you have a refractive error, your eye doctor can prescribe eyeglasses or contact lenses to help you see clearly.

There are 4 common types of refractive errors:

Nearsightedness (myopia) makes far-away objects look blurry

Farsightedness (hyperopia) makes nearby objects look blurry

Astigmatism can make far-away and nearby objects look blurry or distorted

Presbyopia makes it hard for middle-aged and older adults to see things up close

Refractive errors can be caused by:

1. Eyeball length (when the eyeball grows too long or too short)

2. Problems with the shape of the cornea (the clear outer layer of the eye)

3. Aging of the lens (an inner part of the eye that is normally clear and helps the eye focus)

4. Some people develop a refractive error after surgery to remove cataracts from their eyes

The most common symptom is blurry vision. Other symptoms include:

1. Double vision

2. Hazy vision

3. Seeing a glare or halo around bright lights

4. Squinting

5. Headaches

6. Eye strain (when your eyes feel tired or sore)

7. Trouble focusing when reading or looking at a computer

Some people may not notice the symptoms of refractive errors.It’s important to get eye exams regularly — so your eye doctor can make sureyou’re seeing as clearly as possible.

If you wear glasses or contact lenses and still have these symptoms, you mightneed a new prescription. Talk to your eye doctor and get an eye exam if you arehaving trouble with your vision.

There’s usually nothing you can do to prevent a refractive error from developing in your eyes.Because they’re caused by the shape of your eye, cornea or lens — or changes to these parts of your eyes —there’s no way to prevent refractive errors. There’s also nothing you can do to prevent your childfrom being born with a refractive error.

An eye care specialist will diagnose refractive errors with an eye exam.They’ll look at your eyes (including inside them). They’ll also have youperform a visual acuity test. This will help determine which type of refractiveerror you have and how much it’s affecting your vision.

Eye doctors can correct refractive errors with glasses or contact lenses, or fix the refractive error with surgery.

Glasses. Eyeglasses are the simplest and safest way to correct refractive errors.Your eye doctor will prescribe the right eyeglass lenses to give you the clearest possible vision.

Contacts. Contact lenses sit on the surface of your eyes and correct refractive errors.Your eye doctor will fit you for the right lenses and show you how to clean and wear them safely.

Surgery. Some types of surgery, like laser eye surgery, can change the shape of your cornea to fix refractive errors.Your eye doctor can help you decide if surgery is right for you.

Talk over your options with your eye doctor. Remember these tips:

1. See your doctor for eye exams regularly

2. Tell your doctor if your vision gets worse or if you are having problems with your glasses or contact lenses

3. Encourage family members to get checked for refractive errors, since they can run in families