Which test is used to determine the quantity of tears produced?

The Schirmer's Test is employed to quantitatively assess tear production. This test involves placing a small strip of filter paper under the lower eyelid, where it measures the amount of tears that soak into the paper over a set period. A specific length of paper that remains wet indicates adequate tear production, while a shorter wet length suggests reduced tear output, which can help diagnose conditions like dry eye syndrome.

In contrast, the Break Up Time Test evaluates the stability of the tear film and involves measuring the time it takes for the tear film to break up after a blink, rather than the quantity of tears. The Rose Bengal Test assesses ocular surface abnormalities and cell viability, often in the context of dry eye conditions, but does not provide a measure of tear quantity. The Fluorescein Test primarily highlights corneal defects and dry spots but is also not aimed at quantifying tear production. Thus, Schirmer's Test remains the gold standard for directly measuring the quantity of tears produced.