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(Lazy Eye)
  • Definition

    Amblyopia, often called lazy eye, is a condition that occurs when there is a reduction of vision in one eye that is not correctable with glasses.
    There are 2 common types of amblyopia:
    • Anisometropic amblyopia—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 by large differences in astigmatism.
    • Strabismic amblyopia— Visible misalignment (crossing) of one eye.
    Strabismic Amblyopia
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    The sooner amblyopia is treated, the more favorable the outcome.
  • Causes

    Amblyopia is caused when the brain prefers (favors) one eye to the other. The brain’s preference (liking) for one eye over the other can weaken and reduce vision in the eye that is less used.
    There are no apparent genetic or environmental factors that can be attributed to causing amblyopia.
  • Risk Factors

    Amblyopia is more common in children under 10 years old with:
    • Crossed eyes
    • A large difference in sight between the 2 eyes that may be:
      • Unnoticed
      • Detected by a large difference in eyeglass prescription
    • Visual blockage such as a cataract, droopy eyelid, or corneal scarring
    Amblyopia can also occur in adults.
  • Symptoms

    Some people with amblyopia may not have symptoms. In those that have them, amblyopia may cause:
    • A droopy (the inability to fully open) eyelid that blocks the pupil
    • Headaches
    • Blurry vision
    • Excessive squinting or closing of the eyes
    • Repeatedly closing of one eye in bright sunlight
    • Crossing of one eye, generally the eye that is less used will excessively turn toward the nose
    Symptoms vary depending on the extent of the amblyopia.
  • Diagnosis

    Your eye doctor will ask about your symptoms and medical history. An examination of your eyes will be done. Since amblyopia tends to occur in young children, the types of tests their eye doctor will perform will be determined by their age and ability to respond.
    Tests to evaluate the eyes may include:
    • Visual acuity assessment testing (VAT)—to assess distant vision
    • Cycloplegic refraction test—to assess how the eyeball displays and receives images produced by the lens of the eye
    • Retinoscopy—to determine a preverbal child’s eyeglass prescription
    • Prisms—to determine the amount of crossing between the 2 eyes
  • Treatment

    Treatment includes correcting visual obstructions, such as cataracts and other visual abnormalities.
    Talk to your doctor about the best option for you. These may include:
    Atropine Penalization
    Atropine drops or ointment is placed in the non-amblyopic eye. This causes the sound eye to become unfocused and forces the use of the lazy eye.
    Occlusive Therapy
    Occlusive therapy involves using a patch over the non-amblyopic eye (the sound eye), forcing the use of the lazy eye.
    Bangerter foils are another option. The foils, which are made of thin vinyl, are placed over an eye glass lens, covering the non-amblyopic eye. Just like with the patch, this forces the weaker eye to become stronger because you will not be able to see well with the foiled lens.
  • Prevention

    While there are no current guidelines to prevent amblyopia, vision screening can help to detect the condition at an early age. Children under age 3-5 (or younger) years should be examined for eye problems.

    Eye Smart—American Ophthalmology

    National Eye Institute (NEI)


    Canadian Ophthalmological Society

    The Canadian National Institute for the Blind


    Amblyopia. EBSCO DynaMed website. Available at: Updated August 13, 2012. Accessed June 30, 2013.

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    Sakatani K, Jabbur NS, et al. Improvement in best corrected visual acuity in amblyopic adult eyes after laser in situ keratomileusis. J Cataract Refract Surg. 2004;30(12):2517-2521.

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    5/28/2010 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 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.

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