<prompt> Bitots spot prevalence as public health problem -120.5None  <response>: - bitots spots are triangular, pearly white or yellowish foamy spots on the bulbar conjunctiva on either side of cornea. - the prevalence of bitots spots in population at risk more than 0.5 percent is regarded as a public health problem. Reference : Parks textbook of preventive and social medicine, 23rd edition, pg no:616 p 