<prompt> Most of the viral infections present as ?ConjunctivitisKeratitisKeratoconjunctivitisNone  <response>: Ans. is c i.e., Leprosy Decreased corneal sensation corneal hvpesthesia Alterations in corneal sensitivity occur normally with variations in physiological and environmental factors. Corneal sensitivity decreases steadily with age. In addition, the corneas of brown eyed individuals are generally less sensitive than those in blue -eyed individuals. Impoant causes of reduced corneal sensitivity are : ? 1. Iatroginic Topical drugs : - Cocaine, proparacaine, NSAIDs Diclofenac, ketorolac, Timolal, Betaxolol. Surgery - Corneal and cataract operations. Contact lens use 2. Congenital acquired diseases Corneal dystrophies Scleritis, acute angle closure glaucoma. Infections : - Herpes simplex keratitis dendritic ulcer, Leprosy, Herpes zoster, Syphilic luetic neuropathy. Cerebello-pontile angle tumor : - Acoustic neuroma. Sensory neuropathies : - Diabetes, Leprosy, Amyloidosis, Vitamin A deficiency. Toxins : - Carbon disulfide and Hydrogen sulfide. Syndromes :- Goldenhars syndrome, VACTERAL anomalies, Abetalipoproteinemia, Refsums syndrome, Parry-Romberg syndrome and nephropathic cystinosis, congenital insensitivity to pain, Familial dysautonomia Riley-Day syndrome. 