Analysis of 5184 anterior measured keratotomies after the S. N. Fedorov's method performed at the Krasnoyarsk Interregional Centre of Ophthalmic microsurgery has shown coincidence of practical results with a computer prognosis in 80% of cases. It is shown that unsatisfactory refractive effect is directly related with irregular incisions of the cornea, its perforation and subsequent coarse scarring of the incisions. The authors have worked out a number of measures for optimization of the operation and treatment of persons with coarse scarring of the cornea in the postoperative period, which allows twice to reduce discrepancy between practical results of the operation and computer prognosis.