Variation of the visual threshold with retinal location. I. The central 20 degrees of visual field.
D000221:Adaptation, Ocular; D000328:Adult; D003116:Color; D003623:Dark Adaptation; D006801:Humans; D008027:Light; D008722:Methods; D012160:Retina / Q000502:physiology*; D012171:Retinal Vessels; D013997:Time Factors; D014785:Vision, Ocular; D014794:Visual Fields