| 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. |
| Noun | 1. | 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 |
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