astigmatism

English dictionary entry

Meanings

noun

A defect of a lens such that light rays coming from a point do not meet at a focal point so that the image is blurred.
A disorder of the vision, usually due to a misshapen cornea, such that light does not focus correctly on the retina causing a blurred image.

/əˈstɪɡmətɪzm̩/ LL-Q1860 (eng)-Wodencafe-astigmatism.wav

astigmatism astigmatisms

From a- (negative prefix) + stem of Ancient Greek στίγμα (stígma, “mark, point”) + -ism. Coined by English polymath William Whewell in 1846.

astigmia

stigma stigmatize emmetropia hyperopia myopia pointlessness

anisoastigmatism astigmatic astigmatically mixed astigmatism

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