title: Night myopia: cause and a possible basis for amelioration.
abstract: The relationship between night myopia under simulated night driving conditions and the dark focus accomodation was examined. Over a range of luminance and contrast conditions typical of the night driving situation, college-age subjects accommodated to about one-half the difference between a distant simulated road sign and their individual dark focus. Subsequent laboratory and field experiments demonstrated that: (1) a negative correction equal to one-half the value of the dark focus significantly improved night visual performance as compared with their normal or full dark-focus correction, and (2) greater improvements in performance were obtained for subjects who exhibited a relatively near dark focus.
mesh_terms: D000063:Accidents, Traffic / Q000517:prevention & control; D000065:Accommodation, Ocular; D000293:Adolescent; D000328:Adult; D001334:Automobile Driving; D003624:Darkness; D006801:Humans; D007834:Lasers; D008297:Male; D009216:Myopia / Q000175:diagnosis / Q000209:etiology*; D012029:Refraction, Ocular; D014792:Visual Acuity