Xerophthalmia is considered a problem in a community if:-
Correct Answer: Night blindness >1%
Description: Prevalence criteria for determining the Xerophthalmia problem in a community: Criteria Prevalence Night blindness >1.0% Bitot's spots >0.5% Corneal xerosis / corneal ulceration / keratomalacia >0.01% Corneal ulcer >0.05% Serum retinol >5.0%
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Social & Preventive Medicine
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