<prompt> Vit. A deficiency is characterized by -Bitots spotXerophthalmiaNight blindnessAll  <response>: Ans. is a i.e., Bitots spot; b i.e., Xerophthalmia; c i.e., Night blindness o The most characteristic and specific signs of vitamin A deficiency are eye lesions. o These develop before the age of 2 years. o The term xerophthalmia comprises all the occular manifestations of vitamin A deficiency. Xerophthalmia MI eye It Is a syndrome due to deficiency of vitamin A. o It has following stages 1. Night blindness -- Earliest ocular .symptom 2. Conjuctival xerosis Earliest ocular sign 3. Bitots spot 4. Corneal xerosis 5. Keratomalacia cornea! ulcers 