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Tear film immediately after resurfacing by the eye lids (left) and after surface evaporation (right). The elliptical projection represents the specular component of the coaxial illumination of the operation microscope, where the major and minor axes of the ellipse are given by a and b, respectively, upon incidence (subscript i) and reflection (subscript r). After surface evaporation, the shape of the reflection becomes distorted, such that ai ≠ ar and bi ≠ br.
