Abstract
Lin et al.1 measured the thickness of the tear film behind a soft contact lens by combining pachometry and mechanical measurement of contact lens thickness. They found an average thickness of 11.5 µm. Fogt et al.2 measured the thickness of the tear film in front of a soft contact lens by analyzing oscillations in the reflectance spectrum from the front of the eye. These “spectral oscillations” are caused by interference of light waves reflected from different surfaces. This method has also been used to measure the thickness of the precorneal tear film, the corneal epithelium, Bowman’s layer and the complete cornea.3 The purpose of this study is to determine whether this method can also be used to measure the post-lens tear thickness, and, if so, to compare our results with those of Linet al. 1
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