Xerophthalmia is considered a problem in a community if:-: (A) Night blindness >1%, (B) Bitot spots >1%, (C) Corneal ulceration > 0.05%, (D) Corneal ulcer >0.5%
Answer is A. 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%