Trade name of a handheld instrument designed to view the tear film non-invasively. It uses a cold light source to minimize any drying of the tear film during the examination. It can be used directly in front of the eye or in conjunction with a slit-lamp biomicroscope to gain more magnification. Evaluation of the interference patterns of the anterior surface of the tear film lipid layer facilitates the diagnosis of the cause of dry eye symptoms, as well as screening patients for contact lens wear. The instrument also allows the measurement of the non-invasive break-up time. See precorneal film; non-invasive break-up time test.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann