astigmatism
(noun)
noun
1. (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people
Similar word(s): astigmia
Definition categories: state, ametropia
2. (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
Similar word(s): astigmia