• Tear strips are used to measure the amount od tear production. The Schirmer test is based upon mechanical reflex stimulation of the tear production and is actually a test of reflex tear production when performed without anesthesia.

For optimal results 

• Do not apply any topical medication to the eye or perform any manipulation of the eye before performing the test.
• Place a dry Tear Strip over the middle to lateral 1/3 of the lower eyelid.
• The patient is then instructed to look forward and blink normally. The strip is removed after 5 minutes and amount of wetting is recorded in milimeters.