astigmatism

English

Etymology

From a- (negative prefix) + stem of Ancient Greek στίγμα (stígma, “mark, point”) + -ism.

Pronunciation
  • (US) IPA(key): /əˈstɪɡmətɪzm̩/

Noun

astigmatism (countable and uncountable, plural astigmatisms)

  1. (optics) 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.
  2. (pathology) 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.

Synonyms

Derived terms

Translations
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See also

Further reading
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