Astigmatism
[ə'stɪgmətɪz(ə)m] or [ə'stɪɡmətɪzəm]
Definition
(noun.) (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point.
(noun.) (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people.
Edited by Angelina--From WordNet
Definition
(n.) 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.
Typist: Mason
Definition
n. a defective condition of the eye in which rays proceeding to the eye from one point are not correctly brought to a focus at one point.—adj. Astigmat′ic.
Inputed by Addie
Examples
- It is designed to ascertain variations in corneal curvature for the correction of corneal astigmatism. Edward W. Byrn. The Progress of Invention in the Nineteenth Century.
Inputed by Leslie