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What is Schirmer test is used for testing function of which of the following cranial nerve? and explain in detail?
The Schirmer test for the eye quantitatively measures tear formation placement of filter paper in the lower conjunctival sac. The test result is positive when less than 5 mm of paper is wetted after 5 minutes. It evaluates the function of the greater superficial petrosal branch. Ref: Chang D.F. (2011). Chapter 2. Ophthalmologic Examination. In P. Riordan-Eva, E.T. Cunningham, Jr. (Eds), Vaughan & Asbury's General Ophthalmology, 18e.