Acknowledgement: the authors thank Kats DV, Cand. Sci (Med), Assistant Professor at the Department of Ophthalmology of Pirogov Russian National Research Medical University, for revising the manuscript; Baranov MV Cand. Sci (Med), Vice Principal of Research Institute for Space Medicine, for helping with the recruitment process; Glazko NG, ophthalmologist at Filatov City Clinical Hospital No. 15, for his assistance with data analysis.

Author contribution: Valyakh MA — literature analysis, data acquisition, analysis and interpretation, manuscript preparation; Glazko NG — data analysis; Baranov MV — recruitment of participants; Kats DV — manuscript revision.