Financing: the study was partially conducted as part of the State Assignment of the Ministry of Education and Science of the Russian Federation for the Ufa State Aviation Technical University (code of scientific assignment #FEUE-2021-0013, agreement № 075-03-2021-014) at the scientific research laboratory named ‘Sensor systems based on appliances of integrated photonics’ (sections ‘Materials and methods’, ‘Study results’, ‘Discussion of results’) and as part of the project backed by subsidies in the area of science taken from the budget of the Republic of Bashkortostan to ensure state support of scientific research conducted under the guidance of the leading scientists (НОЦ-РМГ-2021, agreement with the Ufa State Aviation Technical University) (Introduction section).

Author contribution: Ibragimova RR — review of literature, data acquisition and analysis, writing an article; Gilmanov II — development of software, searching a database, testing the existing code components; Lopukhova EA — development of software, writing an article, data acquisition and analysis; Lakman IA, Mukhamadeev TR, Kutluyarov RV — study concept and design, scientific editing; Bilyalov AR — scientific editing; Idrisova GM — data analysis, scientific editing.

Compliance with ethical standards: the study was performed in accordance with the principles of Declaration of Helsinki; all patients signed voluntary informed consent to OCT.