<prompt> Vitamin A deficiency is characterized byBitot spotXerophthalmiaNight blindnessAll of these  <response>: The most characteristic and specific signs of vitamin A deficiency are eye lesions.These develop before the age of 2 years.The term xerophthalmia comprises all the occular manifestations of vitamin A deficiency.Xerophthalmia Dry eve It is a syndrome due to deficiency of vitamin A.It has following stagesNight blindness -- Earliest ocular symptomConjuctival xerosis -- Earliest ocular signBitots spotCorneal xerosisKeratomalacia corneal ulcers 