amblyopia


amblyopia
amblyopic /am'blee op"ik/, adj.
/am'blee oh"pee euh/, n. Ophthalm.
dimness of sight, without apparent organic defect.
[1700-10; < NL < Gk amblyopía, equiv. to amblý(s) dull + -opia -OPIA]

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      reduction in vision in one or both eyes (eye, human) due to abnormal visual experience in early childhood, leading to functional changes in the visual centres of the brain. These changes result from eye-related problems that degrade or distort images received by the brain. The most common causes are misalignment of the eyes ( strabismus) and uncorrected (usually asymmetric) refractive errors (e.g., farsightedness (hyperopia), nearsightedness (myopia), or astigmatism). Other conditions that affect the clarity of vision, such as congenital cataracts (cataract), can also cause amblyopia. In each of these situations the brain receives inferior or inappropriate visual information, which it suppresses over time.

      If left untreated, these changes within the visual centres of the brain will become permanent and lead to irreversible vision deficits. Fortunately, this outcome is usually avoidable or reversible during early childhood by promptly correcting the underlying eye problem (removing the cataract or prescribing eyeglasses) or forcing the use of the weaker eye, often by carefully covering the stronger eye with a patch. However, despite the availability of effective treatments, amblyopia remains a major cause of childhood-onset reduced vision. Vision screening is an essential means of identifying children at risk of developing amblyopia.

Daniel M. Albert David M. Gamm
 

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Universalium. 2010.

Look at other dictionaries:

  • Amblyopia — Classification and external resources ICD 10 H53.0 ICD 9 368.0 …   Wikipedia

  • amblyopia — (n.) 1706, weakening of the eyesight, medical Latin, from Gk. amblyopia dim sightedness, noun of action from amblys dulled, blunt + ops eye (see EYE (Cf. eye)). Related: Amblyopic …   Etymology dictionary

  • Amblyopia — Am bly*o pi*a, Amblyopy Am bly*o py, n. [Gr. ?; ? blunt, dim + ? eye: cf. F. amblyopie.] (Med.) Weakness of sight, without and opacity of the cornea, or of the interior of the eye; the first degree of amaurosis. [1913 Webster] …   The Collaborative International Dictionary of English

  • amblyopia — [am΄blē ō′pē ə] n. [ModL < Gr amblys, dull + OPIA] a loss in sharpness of vision, esp. when not traceable to any intrinsic eye disease amblyopic [am΄blēäp′ik, am΄blēō′pik] adj …   English World dictionary

  • Amblyopia — Impaired vision in an eye due to a disorder of the brain cells that control the vision in that eye, not usually due to a problem with the eye itself. Amblyopia is caused by lack of use of an eye when the brain favors the other eye. The eye is… …   Medical dictionary

  • amblyopia — n. poor sight, not due to any detectable disease of the eyeball or visual system, known colloquially as lazy eye. In practice this strict definition is not always obeyed. For example, in toxic amblyopia, caused by tobacco, alcohol, certain other… …   The new mediacal dictionary

  • amblyopia — noun Etymology: New Latin, from Greek amblyōpia, from amblys blunt, dull + ōpia opia more at mollify Date: circa 1706 dimness of sight especially in one eye without apparent change in the eye structures called also lazy eye • amblyopic adjective …   New Collegiate Dictionary

  • Amblyopia — Klassifikation nach ICD 10 H53.0 Amblyopia ex anopsia …   Deutsch Wikipedia

  • amblyopia — am•bly•o•pi•a [[t]ˌæm bliˈoʊ pi ə[/t]] n. oph dimness of sight without apparent organic defect • Etymology: 1700–10; < NL < Gk amblyōpía=amblý(s) dull + ōpiā opia am bly•op′ic ˈɒp ɪk adj …   From formal English to slang

  • amblyopia — noun /æmblɪˈəʊpɪə/ dimness or blurring of the eyesight due to a fault in transmission of signals to the brain from an otherwise healthy eye. See Also: amblyope, amblyopic …   Wiktionary


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