Astigmatism

Astigmatism is a refractive defect of the eye characterized by an aspherical cornea in which one axis of corneal steepness is greater than the perpendicular axis. Astigmatism causes difficulties in seeing fine detail, and can be often corrected by glasses with a cylindrical lens or by toric contact lenses.

External links

\n* MedlinePlus article\n* AllAboutVision.com article \nCategory:Ophthalmology