What is "ametropia"

Ametropia \Am`e*tro"pi*a\, n. [Gr. ? irregular + ?, ?, eye.] (Med.) a visual impairment resulting from faulty refraction of light rays in the eye. Subtypes include myopia astigmatism and hyperopia. -- Am`e*trop"ic, a.

n. (context medicine English) Any of several disorders of the eye (spherical or cylindrical) resulting from faulty refractive ability.

n. (ophthalmology) faulty refraction of light rays in the eye as in astigmatism or myopia