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eye, defects of the

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eye, defects of the

Abnormalities of the eye that impair vision. Glass or plastic lenses, in the form of spectacles or contact lenses, are the usual means of correction. Common optical defects are short-sightedness or myopia; farsightedness or hypermetropia; lack of accommodation or presbyopia; and astigmatism. Other eye defects include colour blindness.
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