Technology for Life Science Specular reflection Q Principle The tear film is a thin layer of approximately 100 nm thick. Irradiation of white light on the tear film surface, several interference patterns appear by difference in two specular reflection light paths obtained between the surface and the back of the lipid layer. Also, advanced optical system designed for the shape of the cornea makes it possible to observe the interference image in a wide area. In addition, by the principle of specular reflection, the break-up of the tear film can be observed in a non-invasive manner. Colorful patterns...