<prompt> First clinical sign of Vitamin - A deficiency is:Night blindnessConjunctival xerosisBitots spotsKeratomalacia  <response>: All the ocular manifestations of Vitamin - A deficiency are collectively known as Xerophthalmia Dry Eye. - Xerophthalmia is most common in children aged 1-3 years. First clinical sign of Vitamin - A deficiency: Conjunctival xerosis . First clinical symptom of Vitamin - A deficiency: Night blindness. Conjunctival xerosis in Xerophtalmia - characteristic appearance of emerging like sand banks at receding tide. Bitots Spots are triangular, pearly-white or yellowish, foamy spots on bulbar conjunctiva, on either side of cornea temporal nasal. 