About The Word Astigmatism
Learn about the word Astigmatism to help solve your crossword puzzle. Discover Astigmatism definitions and meaning, origins, synonyms, related terms and more at the free Crossword Dictionary.
Astigmatism
| Astigmatism Definition And Meaning |
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What's The Definition Of Astigmatism?
[n] (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
[n] (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea Synonyms | Synonyms for Astigmatism: astigmia Related Terms | Find terms related to Astigmatism: See Also | ametropia | condition | keratectasia | keratoconus | status Astigmatism In Webster's Dictionary \A*stig"ma*tism\, n. [Gr. 'a priv. + ?, ?, a prick
of a pointed instrument, a spot, fr. ? to prick: cf. F.
astigmatisme.] (Med. & Opt.)
A defect of the eye or of a lens, in consequence of which the
rays derived from one point are not brought to a single focal
point, thus causing imperfect images or indistinctness of
vision.
Note: The term is applied especially to the defect causing
images of lines having a certain direction to be
indistinct, or imperfectly seen, while those of lines
transverse to the former are distinct, or clearly seen.
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