To define a health problem, prevalence of corneal xerosis should be -: (A) >1%, (B) >0.5%, (C) >0.01%, (D) >0.05%
Answer is C. - corneal xerosis a serious problem in which cornea appears dull, dr and non wettable and eventually opaque. - To define a health problem, prevalence of corneal xerosis should be more than 0.01%. Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:616 <\p>