[Prevalence of keratoconus patients in Japan].
D000293:Adolescent; D000328:Adult; D002648:Child; D016039:Corneal Transplantation; D005260:Female; D006801:Humans; D007564:Japan; D007640:Keratoconus / Q000453:epidemiology* / Q000601:surgery; D008297:Male; D008875:Middle Aged