astigmatism
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English
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Etymology
From a- (negative prefix) + stem of Ancient Greek στίγμα (stígma, “mark, point”) + -ism. Coined by English polymath William Whewell in 1846.
Pronunciation
Noun
astigmatism (countable and uncountable, 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
Related terms
Translations
defect of a lens
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disorder of the vision
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See also
Further reading
astigmatism on Wikipedia.Wikipedia
Romanian
Etymology
Borrowed from French astigmatisme. By surface analysis, astigmat + -ism.
Noun
astigmatism n (uncountable)
Declension
| singular only | indefinite | definite |
|---|---|---|
| nominative-accusative | astigmatism | astigmatismul |
| genitive-dative | astigmatism | astigmatismului |
| vocative | astigmatismule | |
Swedish
Noun
astigmatism c
Declension
| nominative | genitive | ||
|---|---|---|---|
| singular | indefinite | astigmatism | astigmatisms |
| definite | astigmatismen | astigmatismens | |
| plural | indefinite | — | — |
| definite | — | — |
See also
- brytningsfel (“refractive error”)