Mucin tear film deficiency occurs in: (A) Keratoconjunctivitis sicca, (B) Lacrimal gland removal, (C) Canalicular block, (D) Herpetic keratitis
Answer is D. Ans. (d) Herpetic keratitisRef: Khurana anatomy, 2/e, p. 389Soluble surfactant (Mucin) deficiency is caused by ocular surface disorders affecting the goblet cells which secrete mucus forming the innermost layer of the tear film. Herpes infection causes Keratoconjunctivitis and hence mucin deficiency.