astigmatism
English
Etymology
From a- (negative prefix) + stem of Ancient Greek στίγμα (stígma, “mark, point”) + -ism.
Pronunciation
- (US) IPA(key): /əˈstɪɡmətɪzm̩/
Noun
astigmatism (plural astigmatisms)
- (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.
- (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
- astigmatic
- astigmatically
Related terms
Translations
defect of a lens
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disorder of the vision
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- The translations below need to be checked and inserted above into the appropriate translation tables, removing any numbers. Numbers do not necessarily match those in definitions. See instructions at Wiktionary:Entry layout#Translations.
Translations to be checked
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See also
- emmetropia
- hyperopia
- myopia
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