Impairment of functions of structures related to eyes
Impairments of visual quality
Incidence
US statistics (2016) for common eye disorders in people over age 40 are that: (a) 24.4 million people have cataracts; (b) 2.7 million have glaucoma; (c) 4.2 million suffer impaired vision; and (d) 4.88 million suffer dry eye.