The dark focus of the human eye and its relationship to age and visual defect.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D003624:Darkness; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012030:Refractive Errors / Q000503:physiopathology; D014785:Vision, Ocular / Q000502:physiology*