astigmatism

== English == === Etymology === From a- (negative prefix) + stem of Ancient Greek στίγμα (stígma, “mark, point”) + -ism. Coined by English polymath William Whewell in 1846. === Pronunciation === (US) IPA(key): /əˈstɪɡmətɪzm̩/ === 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 ==== astigmia ==== Derived terms ==== ==== Related terms ==== stigma stigmatize ==== Translations ==== ==== See also ==== === Further reading === astigmatism on Wikipedia.Wikipedia == Romanian == === Etymology === Borrowed from French astigmatisme. By surface analysis, astigmat +‎ -ism. === Noun === astigmatism n (uncountable) astigmatism ==== Declension ==== == Swedish == === Noun === astigmatism c (optics) astigmatism (pathology) astigmatism ==== Declension ==== ==== See also ==== brytningsfel (“refractive error”) === References === astigmatism in Svensk ordbok (SO) astigmatism in Svenska Akademiens ordlista (SAOL) astigmatism in Svenska Akademiens ordbok (SAOB) Svensk MeSH