<prompt> Epithelial xerosis of the conjunctiva is caused byTrachomaXerophthalmiaDiphtheriaPemphigus  <response>: Epithelial xerosis: It occurs due to hypovitaminosis -A. Epithelial xerosis may be seen in association with night blindness or as a part and parcel of the xerophthalmia the term which is applied to all ocular manifestations of vitamin A deficiency which ranges from night blindness to keratomalacia 