Nearsightedness

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Dictionary Meaning and Definition on 'Nearsightedness'

Nearsightedness Meaning and Definition from WordNet (r) 2.0
    nearsightedness n : (ophthalmology) eyesight abnormality resulting from the eye's faulty refractive ability; distant objects appear blurred [syn: myopia, shortsightedness] [ant: hyperopia]
Nearsightedness Meaning and Definition from Webster's Revised Unabridged Dictionary (1913)
    Nearsightedness \Near"sight`ed*ness\, n. See Myopic, and Myopia.
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Wikipedia Meaning and Definition on 'Nearsightedness'


Myopia (Greek: μυωπία, muōpia, "nearsightedness" (Am. Eng.), "shortsightedness" (Brit. Eng.)) is a refractive defect of the eye in which collimated light produces image focus in front of the retina when accommodation is relaxed.

Eye care professionals most commonly correct myopia through the use of corrective lenses, such as glasses or contact lenses. It may also be corrected by refractive surgery, but this does have many risks and side effects. The corrective lenses have a negative optical power (i.e. are concave) which compensates for the excessive positive diopters of the myopic eye.

Myopia has been classified in various manners.

Borish and Duke-Elder classified myopia by cause:

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