An epidemiological study of lens opacities among steel workers.
D000328:Adult; D000367:Age Factors; D002386:Cataract / Q000145:classification / Q000175:diagnosis / Q000453:epidemiology*; D004781:Environmental Exposure; D006358:Hot Temperature; D006801:Humans; D008297:Male; D008669:Metallurgy; D008875:Middle Aged; D009784:Occupational Diseases / Q000453:epidemiology*