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. Source: opted

2. n. (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people Source: wordnet

3. n. (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point Source: wordnet

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. Source: webster

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. Source: adambom

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 Source: ecdict

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