- ametropia - (ophthalmology) faulty refraction of light rays in the eye as in astigmatism or myopia
--1 is a kind of visual impairment, visual defect, vision defect, visual disorder
--1 has particulars:myopia, nearsightedness, shortsightedness; astigmatism, astigmia; hyperopia, hypermetropia, hypermetropy, farsightedness, longsightedness