Astigmatism - Definition
astigmatism
n 1: (ophthalmology) impaired eyesight resulting usually from
irregular conformation of the cornea; common in nearsighted
people [syn: astigmatism, astigmia]
2: (optics) defect in an optical system in which light rays from
a single point fail to converge in a single focal point [syn:
astigmatism, astigmia] [ant: stigmatism]