Clinical course of different stages of primary open-angle glaucoma (POAG) is studied in 216 patients (432 eyes) who followed monitoring and treatment instructions during 13 years and in those who didn't. In patients who did not follow recommendations glaucoma progression was found in 99,4% of patients with initial disease, in 48,7% of cases with advanced stage and in 50% of patients with the end stage of the disease. Patients who followed recommendations of general ophthalmologists and glaucomatologists showed stable course of glaucoma process in 1 patient (0,6%) with initial stage, in 51,3% of patients with advanced stage and in 50% of patients with the end stage of the disease.