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