Abstract. The skin of patients before and after cosmetic procedures is studied in vivo with a modified Michelson-Fizeau interferometer. The relevance of the work is shown, since obtaining reliable data on the geometric parameters of the skin surface, its condition is important for every person. The surface relief of the skin around the eyes in patients aged 38–45 years is chosen as the object of the in vivo study. Optical and functional diagrams of the measuring system are given, as well as technical and operational characteristics. Experimental results are obtained for 10 patients. It is revealed that after the application of botulinum toxin, the skin becomes smoother and more elastic, there is practically no variation in the height of the relief.

Keywords: interferometer, human skin, optical diagram, coherence length, botulinum toxin, injection

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