Dry eyes may result from:
The inability of tears to drain into the nose can occur with:
Risks There are no risks with this test.
Do not rub the eyes for at least 30 minutes after the test. Contact lenses should be left out for at least 2 hours after the test.
Even though Schirmer's test has been available for more than a hundred years, several studies show that it does not properly identify a large group of patients with dry eyes. Newer and better tests are being developed. One test measures a molecule called lactoferrin. Patients with low tear production and dry eyes have low levels of this molecule.
Another test involves fluorescein eye drops, which contain a dye that is placed in the eye. Tears should flush the dye into the nose within 2 minutes. It will take longer in persons with dry eyes.