An ophthalmologist can look at the film of tears on your eye using a slit lamp (biomicroscope). A dye such as fluorescein may be placed in the eye to make the tear film more visible. Your health care provider may do a Schirmer's test, measuring the rate of tear production using a calibrated paper wick placed on the edge of the eyelid.
Your eye's cornea may be thick. You may have reduced visual acuity.