- Anisometropic amblyopia occurs when the vision in one eye differs from the other. This is often caused by a large difference in eyeglass prescription. The difference may be caused by one eye being more nearsighted or farsighted than the other or caused by large differences in astigmatism. In general, people who have anisometropic amblyopia are often asymptomatic (showing no signs of the condition).
- Strabismic amblyopia occurs when there is a visible misalignment (crossing) of one eye.
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Age: children nine years of age or younger with:
- Crossed eyes
- A large difference in sight between the two eyes (nearsighted, farsighted, or astigmatism) that may
- Not be noticed
- Be detected by a large difference in eyeglass prescription
- Visual blockage such as a cataract, droopy eyelid, or corneal scarring
- A droopy (the inability to fully-open) eyelid that blocks the pupil
- Blurry vision
- Excessive squinting or closing of the eyes
- Repeatedly closing of one eye in bright sunlight
- A misalignment (crossing) of one eye, generally the eye that is less used will excessively turn toward the nose
- Visual acuity assessment testing (VAT)—such as the Lea Symbols test that is used to assess distant vision.
- Cycloplegic refraction test—which is performed to determine how the eyeball displays and receives images produced by the lens of the eye. To perform the test, eye drops are used to dilate (widen the pupil) for a better view of the eye. To determine the direction of light the eye receives and displays, the dilating drops briefly paralyze (impair movement or make inactive) the eye muscles that control focusing.
- Retinoscopy which allows an eye specialist to determine a preverbal child’s eyeglass prescription
- Prisms to determine the amount of crossing between the two eyes if present
American Association for Pediatric Ophthalmology and Strabismus http://www.aapos.org
National Eye Institute (NEI) http://www.nei.nih.gov
Prevent Blindness America http://www.preventblindness.org
Canadian Ophthalmological Society http://www.eyesite.ca
The Canadian National Institute for the Blind http://www.cnib.ca
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5/28/2010 DynaMed's Systematic Literature Surveillance DynaMed's Systematic Literature Surveillance : Pediatric Eye Disease Investigator Group Writing Committee, Rutstein RP, Quinn GE, et al. A randomized trial comparing Bangerter filters and patching for the treatment of moderate amblyopia in children. Ophthalmology. 2010;117(5):998-1004.
2/4/2011 DynaMed's Systematic Literature Surveillance DynaMed's Systematic Literature Surveillance : US Preventive Services Task Force. Vision screening for children 1 to 5 years of age: US Preventive Services Task Force recommendation statement. Pediatrics. 2011;127(2):340-346.
- Reviewer: Michael Woods, MD
- Review Date: 06/2013
- Update Date: 00/63/2013