a·stig·ma·tism ( -st g m-tz m)n. A visual defect in which the unequal curvature of one or more refractive surfaces of the eye, usually the cornea, prevents light rays from focusing clearly at one point on the retina, resulting in blurred vision. [a- + Greek stigma, stigmat-, point (from stizein, stig-, to tattoo; see steig- in Indo-European roots).] as tig·matic ( stg-mtk) adj. & n.as tig·mati·cal·ly adv. |
astigmatism [əˈstɪgməˌtɪzəm], astigmia [əˈstɪgmɪə]
n
1. (Physics / General Physics) a defect of a lens resulting in the formation of distorted images; caused by the curvature of the lens being different in different planes
2. (Medicine / Pathology) faulty vision resulting from defective curvature of the cornea or lens of the eye
| astigmatism (-stgm-tzm) A visual defect in which the unequal curvature of one or more refractive surfaces of the eye, usually the cornea, prevents light rays from focusing clearly at a single point on the retina, resulting in blurred vision. |   top: astigmatic vision; bottom: corrected vision |
astigmatism
a defect in a lens, eye, or mirror that causes rays from one direction not to focus at one point. — astigmatic, adj.
See also: Eyes
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. | astigmatism - (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people ophthalmology - the branch of medicine concerned with the eye and its diseases ametropia - (ophthalmology) faulty refraction of light rays in the eye as in astigmatism or myopia keratectasia - abnormal bulging of the cornea of the eye keratoconus - abnormal cone-shaped protrusion of the cornea of the eye; can be treated by epikeratophakia |
| 2. | astigmatism - (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point optics - the branch of physics that studies the physical properties of light condition, status - a state at a particular time; "a condition (or state) of disrepair"; "the current status of the arms negotiations" 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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