Mass blindness has shifted from infection (onchocerciasis, trachoma, corneal ulcers) to cataract.
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D001766:Blindness / Q000453:epidemiology / Q000209:etiology* / Q000382:microbiology*; D002386:Cataract / Q000150:complications*; D002387:Cataract Extraction; D004196:Disease Outbreaks; D006801:Humans; D007239:Infections