Astigmatism : Definition


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Definitions of Astigmatism

Pronunciation : A*stig"ma*tism
Part of Speech : n.
Etymology : [Gr. astigmatisme.] (Med. & Opt.)
Definition : Defn: 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 indistictness 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.

Source : Webster's Unabridged Dictionary, 1913


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