The main causes of blindness and poor vision and their frequency vary in different regions of the world, which is due to a number of factors (socioeconomic, demographic, geoclimatic, etc.), as well as the level of medicine and, in particular, the state of the ophthalmo-pediatric service. The prevalence of childhood blindness in the world is about 1.3 million, visually impaired - 5.2 million people.