Word:

Astigmatism

A`stig´ma`tism
n.1.(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.
Noun1.astigmatism - (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea
Synonyms: astigmia
2.astigmatism - (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
Synonyms: astigmia
Antonyms:
stigmatism - (optics) condition of an optical system (as a lens) in which light rays from a single point converge in a single focal point
ametropia, astigmia, keratectasia, keratoconus, ophthalmology
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-- Astigmatism --
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