What test is used to measure tear flow?

The Schirmer test is specifically designed to measure tear flow in the eyes. It involves placing a small strip of paper under the lower eyelid, where it captures tears and allows for an assessment of lacrimal gland function. A certain length of the strip that becomes wet over a set time frame indicates the volume of tears produced. This test is essential for diagnosing various eye conditions, including dry eye syndrome, as it quantifies the amount of moisture and helps healthcare professionals determine the appropriate treatment.

Tonometrically measuring the pressure inside the eye assesses different conditions, primarily glaucoma, and does not provide information about tear flow. The fluorescein test focuses on evaluating corneal integrity and the presence of foreign bodies but also does not measure tear production. Measuring visual acuity assesses how well a person can see but is unrelated to tear secretion or production. Thus, the Schirmer test stands as the most appropriate choice for measuring tear flow.