The eye has a cornea a clear, curved layer that protects it. If the cornea's shape is irregular, astigmatism results. People who have astigmatism see images as distorted, so they need to wear glasses or contact lenses.
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.
Noun
(optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
Noun
(ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea
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.
Astigmatism
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.
Usage Examples
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