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Schirmer's Test

The eye maintains a stable level of moisture and eliminates foreign particles by producing tears. When your eyes are too dry or too wet, your doctor may perform the Schirmer’s test. Test is also known as the:
• Dry eye test
• Tear test
• Tearing test
• Basal secretion test

Tear break up time (TBUT)

(TBUT) is a clinical test used to assess for evaporative dry eye disease. … The TBUT is recorded as the number of seconds that elapse between the last blink and the appearance of the first dry spot in the tear film, as seen in this progression of these slit lamps photos over time.