Figure 1.

Representative examples of the LacryDiag Ocular Surface Analyzer and Keratograph 5M tests. Descending vertically, these include tear meniscus height – the height of the inferior tear meniscus measured from the top of the inferior eyelid margin to the top of the inferior tear lake (indicated by green arrows); noninvasive tear break-up time – the amount of time immediately after a blink before the first visible disruption of the circular reflected white light mires; tear film interferometry – characterized by the pattern and movement of interference patterns visualized using white light on the surface of the tear film; and, meibography – assessment of the structure of the inferior and superior meibomian glands which produce meibum, a lipid substance that prevents tear film evaporation. Inferior meibomian glands shown.