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noun(optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
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noun(ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people
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Definition that contains astigmatism
- stigmatic pertaining to a lens or lens system free of astigmatism (able to form point images)
- anastigmatic pertaining to a lens or lens system free of astigmatism (able to form point images)
- ametropia (ophthalmology) faulty refraction of light rays in the eye as in astigmatism or myopia
- anastigmatic lens a lens designed to correct astigmatism
- anastigmat compound lens or lens system designed to be free of astigmatism and able to form approximately point images