<prompt> Schirmers test detects abnormality of which nerve?OculomotorFacialHypoglossalGlossopharyngeal  <response>: Refer: AK Khurana Comprehensive Ophthalmology, 6th edition, pg no. 389Schirmers test is used for the production of tear by lacrimal glandsPreganglion secretory fibers for lacrimal gland arise from the lacrimatory nucleus and pass through the facial nerve, then to its greater petrosal branch. Greater petrosal nerve forms nerve to the pterygoid canal to reach pterygopalatine ganglion. Postganglionic fibers supply lacrimal glandThus, lesion in any structure of this pathway will have positive Schirmers test 