1. D. V. Pridachina, E. T. Zhilyakova, and M. Yu. Novikova, Sovrem. Probl. Nauki Obraz., No. 6 (2011); https: //www.science- education.ru/ru/article/view?id=4990.
2. G. S. Polunin, V. V. Kurenkov, T. N. Safonova, et al., Refrakts. Khir. Oftal’mol., 3(3), 53 – 56 (2003).
3. A. J. Bron, “The definition and classification of dry eye disease,” in: Dry Eye: A Practical Approach. Essentials in Ophthalmology, C. Chan (ed.), Springer-Verlag, Berlin, Heidelberg, 2015, pp. 1 – 19.
4. F. Stapleton, Q. Garrett, C. Chan, and J. P. Craig, “The epidemiology of dry eye disease,” in: Dry Eye: A Practical Approach. Essentials in Ophthalmology, Springer-Verlag, Berlin, Heidelberg, 2015, pp. 21 – 29.
5. O. V. Kol’chik and P. V. Sorokin, Nizhegorod. Med. Zh., No. 8, 193 – 196 (2006).