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Astigmatism

Synonym(s)

Unequal curvature of the refractive surfaces of the eye. Thus a point source of light cannot be brought to a point focus on the retina but is spread over a more or less diffuse area. This results from the radius of curvature in one plane being longer or shorter than the radius at right angles to it. (Dorland, 27th ed): Definition from: MeSH via Unified Medical Language System at the National Library of Medicine
optical defect in which refractive power is not uniform in all directions (meridians); light rays entering the eye are bent unequally by different meridians, which prevents formation of a sharp image focus on the retina.: Definition from: CRISP Thesaurus via Unified Medical Language System at the National Library of Medicine


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