(n) (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point, Syn.astigmia, Ant.stigmatism
The Collaborative International Dictionary of English (GCIDE) v.0.53
n. [ Gr. 'a priv. + &unr_;, &unr_;, a prick of a pointed instrument, a spot, fr. &unr_; 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. [ 1913 Webster ]
☞ 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. [ 1913 Webster ]
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