astigmatism

(ă-stig′mă-tizm )

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[ ¹an- + Gr. stigma, stem stigmat-, point + -ism ]
ABBR: As A form of ametropia in which the refraction of a ray of light is spread over a diffuse area rather than sharply focused on the retina. It is due to differences in the curvature in various meridians of the cornea and lens of the eye. The exact cause is unknown. Some types show a familial pattern.
astigmatic (as″tig-mat′ik )

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, adj.
SYN: SEE: astigmia

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