<prompt> Neurotrophic keratopathy is caused by -Bells palsyFacial and trigeminal nerve palsy bothTrigeminal nerve palsyAll of the above  <response>: Neuroparalytic keratitis occurs due to paralysis of the sensory nerve supply of the cornea. Causes I.Congenital 1.Familial dysautonomia Riley-Day syndrome 2.Congenital insensitivity to Pain. 3.Anhidrotic ectodermal dysplasia. II.Acquired 1.Following alcohol-block or electrocoagulation of Gasserian ganglion or section of the sensory root of trigeminal nerve for trigeminal neuralgia. 2.A neoplasm pressing on Gasserian ganglion. 3.Gasserian ganglion destruction due to acute infection in herpes zoster ophthalmicus. 4.Acute infection of Gasserian ganglion by herpes simplex virus. 5.Syphilitic luetic neuropathy. 6.Involvement of corneal nerves in leprosy. 7.Injury to Gasserian ganglion Reference:Comprehensive ophthalmology,AK Khurana,4th edition,page no.107 