O.R. Shangina - Dr.Sc. (Biol.), Leading Research Scientist, FSBI «Russian Eye and Plastic Surgery Centre» of the Russian Federation Ministry of Health, Ufa, Russia. E-mail: alloolga@mail.ru R.A. Khasanov - Ph.D. (Pharm.), Leading Research Scientist, FSBI «Russian Eye and Plastic Surgery Centre» of the Russian Federation Ministry of Health, Ufa, Russia