Skip navigation | ||
|
||
Medical Encyclopedia |
|
Other encyclopedia topics: | A-Ag Ah-Ap Aq-Az B-Bk Bl-Bz C-Cg Ch-Co Cp-Cz D-Di Dj-Dz E-Ep Eq-Ez F G H-Hf Hg-Hz I-In Io-Iz J K L-Ln Lo-Lz M-Mf Mg-Mz N O P-Pl Pm-Pz Q R S-Sh Si-Sp Sq-Sz T-Tn To-Tz U V W X Y Z 0-9 |
Contents of this page: | |
|
|
Alternative names Return to top
Lazy eyeDefinition Return to top
Amblyopia is loss of visual acuity in one eye caused by lack of use of that eye in early childhood.Causes, incidence, and risk factors Return to top
Amblyopia can be caused by any condition that causes one eye to be favored and the other ignored by the brain. Strabismus (crossed eyes), different refractive errors (farsightedness, nearsightedness, astigmatism) in the two eyes, and childhood cataract are common causes of amblyopia.
The preferred eye becomes dominant and has normal vision. The non-favored eye is ignored by the brain to avoid a clash between the two different images from the eyes. As a result, the visual system in the brain for the non-favored eye fails to develop properly. Between ages 5 and 10, the brain stops growing and the condition becomes permanent.
Strabismus is the most common cause of amblyopia, and there is often a family history of this condition.
Symptoms Return to top
Amblyopia should be suspected in a child if any of the following are seen:
Signs and tests Return to top
Amblyopia is usually easily diagnosed with a complete examination of the eyes. Special tests are usually not required.
Treatment Return to top
The primary treatment involves patching the normal eye to force use of the non-preferred, amblyopic eye. Sometimes, drops are used to blur the vision of the normal eye instead of putting a patch on it. Younger patients have more potential for the visual system of the brain to develop, and thus better potential for improved vision when amblyopia is treated.
The underlying condition will also require treatment. If refractive error is the cause, glasses or contact lenses will be prescribed. If strabismus is the cause, this will require a program of treatment.
Children whose vision cannot be expected to fully recover should wear glasses with protective lenses of polycarbonate, as should all children with only one good eye caused by any disorder.
Expectations (prognosis) Return to top
When treatment starts before age 5, near complete recovery of normal vision is usually possible. This becomes progressively less likely as children become older. Only partial recovery can be expected after age 10.
Complications Return to top
Calling your health care provider Return to top
Call for an appointment with your health care provider or ophthalmologist if a vision problem is suspected in a young child.
Prevention Return to top
Early recognition and treatment of the problem in children can help to prevent permanent visual impairment. All children should have a complete eye examination at least once between age 3 and 5 to avoid the risk of allowing unsuspected amblyopia to go beyond the age where it can be treated successfully.
Update Date: 7/24/2004 Updated by: Edward B. Feinberg, MD, MPH, Professor and Chair, Department of Ophthalmology, Boston University School of Medicine, Boston, MA. Review provided by VeriMed Healthcare Network.
Home | Health Topics | Drug Information | Encyclopedia | Dictionary | News | Directories | Other Resources | |
Copyright | Privacy | Accessibility | Selection Guidelines U.S. National Library of Medicine, 8600 Rockville Pike, Bethesda, MD 20894 National Institutes of Health | Department of Health & Human Services |
Page last updated: 28 October 2004 |