index astigmatism


Also found in: Dictionary, Thesaurus, Encyclopedia.

index astigmatism

Etymology: L, indicare, to make known, a + stigma, point
an astigmatism caused by unequal refractive indices in different parts of the lens.

index astigmatism

Astigmatism resulting from inequalities in the refractive indices of different parts of the lens.
See also: astigmatism