<prompt> Exposure keratopathy is due to involvement of which cranial nerve: March 20124th cranial nerve5th cranial nerve6th cranial nerve7th cranial nerve  <response>: Ans: D i.e. 7th cranial nerve Exposure keratopathy is due to any cause which may produce exposure of the cornea due to incomplete closure of the eyelids lagophthalmos, such as extreme proptosis as in exophthalmic ophthalmoplegia or orbital tumour, paralysis of the orbicularis neuroparalytic keratopathy etc. Keratopathy Neurotrophic keratopathy desquamation of corneal epithelium occurs in some cases in which trigeminal nerve is paralyzed Neuroparalytic keratopathy is seen in facial nerve palsy as occurs in Bells palsy, leprosy or neurological disorders leading to ectropion, lagophthalmos exposure keratopathy 