FIELD: medicine.
SUBSTANCE: invention refers to medicine and medical equipment and is intended for determination of learning time to estimate vision resolution by flicker frequency. After presentation of flickers of reference frequency, flicker sequence is presented to a person being tested at constant presentation time specified within 0.5-1.5 s and an increment frequency increased in comparison with the reference and a decrement frequency decreased in comparison with the reference. At the first stage the flicker sequence is shown at the increment frequency continuously increasing at the rate of 0.5 Hz/s and the decrement frequency continuously decreasing at the same rate until the person being tested specified a difference between the presented frequencies and sets the last increment and decrement frequencies presented. Thereafter, the flicker sequence is presented to the person being tested at the set increment and decrement frequencies before the beginning of the second stage of measurements. At the second stage of measurements the flicker sequence is shown at the increment frequency continuously decreasing during presentation at the specified rate 0.25 Hz/s and the decrement frequency continuously increasing at the same rate until the person being tested specifies subjectively that the shown flickers, and sets the last increment and decrement frequencies shown. Thereafter, the last set increment and decrement frequencies are alternately presented to the person being tested before the beginning of the third stage. At the third stage the flicker sequences are presented to the person being tested with the increment frequency discretely increasing in the beginning of each sequence at a preset constant step of 0.1 Hz and the decrement frequency discretely decreasing in the beginning of each sequence at the same step until the person being tested specifies a flicker difference threshold with the increment and decrement frequencies and sets the last frequencies presented. Vision resolution is defined as a difference between the increment and decrement frequencies set at the third stage, and marked as a point in a coordinate plane "resolution - measurement number". The described procedure is repeated more than once. Function ΔF=f (Ni) of dependence of vision resolution on flicker frequency ΔF is graphed, where Ni is a number of the i-th measurement, i=1, 2,… k, k is a number of measurements, to derive a quasi-stationary mode when a transient process is completed. The learning time is determined by the number of measurements during the transient process.
EFFECT: method consists in determination of learning time to estimate vision resolution by flicker frequency and allows considering an individual stabilisation character of the measured values.
3 dwg, 2 ex
