Mr. Maxim G. Inkin Profile

Maxim G. Inkin

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Proceedings Article | 29 April 2022 Paper

Laser self-mixing interferometry for measuring and analyzing micromovements of the eyeball

Karina Sadchikova, A. Dzhafarov, M. Inkin, S. Yu. Dobdin, An. Skripal

Proceedings Volume 12193, 121930L (2022) https://doi.org/10.1117/12.2626828

KEYWORDS: Eye, Semiconductor lasers, Visualization, Signal processing, Reflectors, Motion analysis, Laser interferometry, Interferometry, Fourier transforms, Pathology

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Laser interferometry for measuring micromovements of the eyeball has been investigated. A technique for processing an interference signal is proposed, which makes it possible to obtain graphs of the speed and acceleration of the eyeball through the closed eyelid. The unknown motion parameters are found from the frequency of the interference signal of the self-mixing laser system as a result of the windowed Fourier transform. The RLD78NZM5 module was used as a source of laser radiation. Experimental measurements were carried out to determine the parameters of eye movement on volunteers at the age of 20 years. For the first volunteer in a calm state, the velocities of the eyeball movement were in the range of up to 800 μm/s, and the accelerations were in the range of ±20 μm/s². For the second volunteer in a calm state, the velocities of the movement of the eyeball were in the range of up to 1300 μm/s, and the accelerations were in the range of up to 40 μm/s². The speed and acceleration of eyeball movements of the volunteers at rest had the lowest values. These parameters increased with eye movement. When the eye moved to the left and to the right, the speed of the eyeball movement of the first volunteer was higher than when the eye moved up and down. On the contrary, when the eye moved to the left and to the right, the velocities of the eyeball movement of the second volunteer were less than when the eye moved up and down. In addition, the analysis of the movement of the eyeball can be carried out even in its closed state. It has been shown that the physiological state of the somebody can influence the nature of eye movement. This influence can be used to assess the psychoemotional state and diagnose various pathologies of the oculomotor apparatus of the human body.

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