FIELD: medicine, ophthalmology. SUBSTANCE: method deals with dosed decrease of light passage in the range shorter than 360 nm up to 1% and increase of light passage is step by step enhanced: in area from 360 to 400 nm to 10%, from 400 to 450 nm from 10% to 15%, from 450 to 500 nm from 15% to 25%, from 500 to 550 nm from 25% to 30%, from 550 to 600 nm from 30% to 40% and from 600 to 650 nm from 40% to 45%. EFFECT: higher efficiency and accuracy. 1 tbl
