About The Word Astigmatism

Bay Area Crosswords

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 Meaning & Definition
Astigmatism Definition And Meaning

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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