Schirmer tear testing and fluorescein staining of the cornea provide important information about a patient’s ophthalmic health. (See Schirmer Tear Test & Fluorescein Stain.) The Schirmer tear test (STT) measures basal tear production and reflex tear response and is often used to diagnose keratoconjunctivitis sicca (KCS).1 Basal tears are normal tears produced daily to lubricate and nourish the ocular surfaces.2

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The STT is performed by inserting an absorbent paper test strip between the lower eyelid and cornea and measuring the length of strip that absorbs moisture in 1 minute. The result is then compared with established normal values. 


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