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Definition of Astigmatism
1. Noun. (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people.
Category relationships: Ophthalmology
Generic synonyms: Ametropia
Specialized synonyms: Keratectasia, Keratoconus
Derivative terms: Astigmatic, Astigmatic
2. Noun. (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point.
Category relationships: Optics
Generic synonyms: Condition, Status
Derivative terms: Astigmatic, Astigmatic
Antonyms: Stigmatism
Definition of Astigmatism
1. 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.
Definition of Astigmatism
1. Noun. (optics) A defect of a lens such that light rays coming from a point do not meet at a focal point so that the image is blurred. ¹
2. Noun. (pathology) A disorder of the vision, usually due to a misshapen cornea, such that light does not focus correctly on the retina causing a blurred image. ¹
¹ Source: wiktionary.com
Definition of Astigmatism
1. [n -S]
Medical Definition of Astigmatism
1.