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Nearsightedness

Definition

Nearsightedness is when light entering the eye is focused incorrectly, making distant objects appear blurred. Nearsightedness is a type of refractive error of the eye.

If you are nearsighted, you have trouble seeing things that are far away.

Alternative Names

Myopia; Shortsightedness; Refractive error - nearsightedness

Causes

People are able to see because the front part of the eye bends (refracts) light and focuses it on the back surface of the eye, called the retina.

Nearsightedness occurs when there is a mismatch between the focusing power of the eye and the length of the eye. Light rays are focused in front of the retina, rather than directly on it. As a result, what you see is blurry. Most of the eye's focusing power comes from the cornea.

Seeing

Watch this video about:
Seeing

Nearsightedness affects males and females equally. People who have a family history of nearsightedness are more likely to develop it. Most eyes with nearsightedness are healthy, but a small number of people with severe nearsightedness develop a form of retinal degeneration.

Symptoms

A nearsighted person sees close-up objects clearly, but objects in the distance are blurred. Squinting will tend to make far away objects seem clearer.

Nearsightedness is often first noticed in school-aged children or teenagers. Children often cannot read the blackboard, but they can easily read a book.

Nearsightedness gets worse during the growth years. People who are nearsighted need to change glasses or contact lenses often. Nearsightedness usually stops progressing as a person stops growing in his or her early twenties.

Other symptoms may include:

Exams and Tests

A nearsighted person can easily read the Jaeger eye chart (the chart for near reading), but has trouble reading the Snellen eye chart (the chart for distance).

A general eye examination, or standard ophthalmic exam may include:

Treatment

Wearing eyeglasses or contact lenses can help shift the focus of the light image directly onto the retina, producing a clearer image.

The most common surgery to correct myopia is LASIK. An excimer laser is used to reshape (flatten) the cornea, shifting the focus.

Outlook (Prognosis)

Early diagnosis of nearsightedness is important, because a child can suffer socially and educationally by not being able to see well at a distance.

Possible Complications

When to Contact a Medical Professional

Call for an appointment with your health care provider if your child shows these signs, which may indicate a vision problem:

Call for an appointment with your eye doctor if you or your child is nearsighted and experiences signs of a possible retinal tear or detachment, including:

Prevention

There is no way to prevent nearsightedness. Reading and watching television do not cause nearsightedness. In the past, dilating eye drops were proposed as a treatment to slow the development of nearsightedness in children, but they have never been proven effective.

The use of glasses or contact lenses does not affect the normal progression of myopia -- they simply focus the light so the nearsighted person can see distant objects clearly. Hard contact lenses will sometimes hide the progression of nearsightedness, but vision will still get worse "under" the contact lens.

References

Garg S, McColgin AZ, Steinert RF. LASIK. In: Tasman W, Jaeger EA, eds. Duane's Ophthalmology 1st ed. Philadelphia, PA: Lippincott Williams & Wilkins; 2012:chap 49.

Olitsky SE, Hug D, Plummer L, Stass-Isern M. Abnormalities of refraction and accommodation. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF, eds. Nelson Textbook of Pediatrics. 19th ed. Philadelphia, PA: Elsevier Saunders; 2011:chap 612.

White PF, Scott CA. Contact lenses. In: Yanoff M, Duker JS, eds. Ophthalmology. 3rd ed. St. Louis, MO: Elsevier Mosby; 2008:chap 2.9.

Whitmore WG. The optics of myopia. In: Tasman W, Jaeger EA, eds. Duane's Ophthalmology Vol. 1. Philadelphia, PA: Lippincott Williams & Wilkins; 2013:chap 42.

Zadnik K, Mutti DO. Biology of the eye as an optical system. In: Tasman W, Jaeger EA, eds. Duane's Ophthalmology. Vol. 1. Philadelphia, PA: Lippincott Williams & Wilkins; 2013:chap 34.


Review Date: 9/2/2014
Reviewed By: Franklin W. Lusby, MD, ophthalmologist, Lusby Vision Institute, La Jolla, CA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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