About The Word Astigmatism

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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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