astigmatism

Words with a similar base: astigmatism

'astigmatism'

[astigmatism.n.01] as in: (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people

'astigmatism'

[astigmatism.n.02] as in: (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point