The SCHIRMER TEAR Test (STT) is a diagnostic test that is indicated to measure the rate of tear production. It should be used in the evaluation of conjunctivitis to diagnose tear deficiency as a contributing factor to ocular surface diseases including: Keratoconjunctivitis sicca (KCS), pigmentary keratitis, indolent corneal ulcers, exposure keratitis, and others. In addition, it can be used to assess lacrimal gland function prior to cataract surgery.