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Night Myopia

1976; Lippincott Williams & Wilkins; Volume: 53; Issue: 11 Linguagem: Inglês

10.1097/00006324-197611000-00001

1538-9235

D. Alfred Owens, Herschel W. Leibowitz,

Visual perception and processing mechanisms

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.