(adj) of or relating to a defect in the eye or in a lens caused by a deviation from spherical curvature which prevents light rays from meeting at a common focus and so results in distorted images, Ant.anastigmatic
The Collaborative International Dictionary of English (GCIDE) v.0.53
a. [ Pref. an-not + astigmatic. ] (Optics) Not astigmatic; free of astigmatism; -- pertaining to a lens or lens system, and used especially of a lens system which consists of a converging lens and a diverging lens of equal and opposite astigmatism but different focal lengths, and sensibly free from astigmatism. [ Webster 1913 Suppl. + WordNet 1.5 ]
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