Which of the following is the earliest clinical sign of Vit A deficiency?: (A) Bitot's spot, (B) Corneal xerosis, (C) Conjunctival xerosis, (D) Keratomalacia
Answer is C. The ocular manifestation of Vit A deficiency includes night blindness, conjunctival xerosis, Bitot's spot, corneal xerosis and keratomalacia. Extra ocular manifestation of Vit A deficiency includes follicular hyperkeratosis, anorexia and growth retardation. Ref: Park, 21st Edition, Page 568.