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Noun
astigmatism
astigmia
Definition: (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people
astigmatism
astigmia
Definition: (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
Definition: A defect of a lens such that light rays coming from a point do not meet at a focal point so that the image is blurred.