How is the Schirmer test typically conducted?

The Schirmer test is typically conducted by placing a small strip of filter paper in the lower conjunctival sac, which is the area between the lower eyelid and the eyeball. This strip absorbs tears over a specific period, usually five minutes, allowing for the measurement of tear production. The amount of moisture on the filter paper indicates the volume of tears produced, which aids in diagnosing conditions related to dry eyes or other tear film dysfunctions.

The use of filter paper is essential in this test as it provides a standardized method to assess tear production objectively. The other methods mentioned do not pertain to the Schirmer test; fluorescent dye is used in other ophthalmic tests, measuring surface tension is unrelated to tear measurement, and digital pressure tests are not standard practices in evaluating tear production.