Thesaurus: astigmatism

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Definitions

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.
2. n. (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people
3. n. (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
4. 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 indistictness of vision. Note: The term is applied especially to the defect causing images of lines having a certain direction to be indistinct, or imperfectly seen, while those of lines transverse to the former are distinct, or clearly seen.
5. A defect of the eye or of a lens, in consequence of which therays derived from one point are not brought to a single focal point,thus causing imperfect images or indistictness of vision.
6. n:100 n. (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people n. (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point