THE COMMON VISUAL DISORDERS: THEIR EFFECT ON JOB PERFORMANCE

Common visual disorders are subdivided into two major groups — the ametropias and anomalies of binocular vision. Myopia, hypermetropia and astigmatism are discussed from Sorsby's aetiological standpoint of correlation and component mechanisms, and the incidence of these conditions and presbyopia is detailed with some figures on the necessity for correction. Binocular anomalies of heterophoria, strabismus and amblyopia are described, together with some data on the performance of the one-eyed person. The relationship between visual acuity and illumination is explained with particular reference to the common disorders of vision.