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astigmatism
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astigmatism
n. unequal curvature of the lens of the eye creating a distorted image

Wikipedia English The Free EncyclopediaDownload this dictionary
Astigmatism
An optical system with astigmatism is one where rays that propagate in two perpendicular planes have different foci. If an optical system with astigmatism is used to form an image of a cross, the vertical and horizontal lines will be in sharp focus at two different distances. The term comes from the Greek α- (a-) meaning "without" and στίγμα (stigma), "a mark, spot, puncture".

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WordNet 2.0 DictionaryDownload this dictionary
astigmatism
Noun
1. (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea
(synonym) astigmia
(hypernym) ametropia
(hyponym) keratectasia
(classification) ophthalmology
2. (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
(synonym) astigmia
(antonym) stigmatism
(hypernym) condition, status
(classification) optics


Babylon English-CzechDownload this dictionary
astigmatism
n. astigmatismus

Babylon English-PolishDownload this dictionary
astigmatism
Rzecz. astygmatyzm

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