METHOD FOR DETERMINATION OF LABILITY OF HUMAN VISUAL SYSTEM Russian patent published in 2012 - IPC A61B3/02 

FIELD: medicine.

SUBSTANCE: invention is referred to the area of medicine and medical devices. The test subject is shown the sequences of coupled light pulses with duration of 50 ms and with pulse separation of 150 ms, repeated after constant time interval 1 s. In the first stage the duration of pulse separation in the couple is shortened with the constant speed 20 ms/s until the test subjects defines the moment of subjective merge of two light pulses in the couple into one. In the second stage the duration of pulse separation in the couple is increased with constant speed 2 ms/s until the subjective feeling of separation of two light pulses in the couple. In the third stage the duration of pulse separation in the couple is decreased discretely with the pitch 0.1 ms until the moment of subjective merge of two pulses. The duration of pulse separation in the moment is taken as liminal duration of pulse separation t_lim. In the fourth stage the test subject is shown the rhythmic sequence of light pulses with duration 50 ms separated with liminal pulse separation t_lim, the duration of pulse separation is decreased discretely with the pitch 0.1 ms until the moment of subjective merge of two pulses. The duration of pulse separation in the moment is taken as critical duration of pulse separation t_cr. The lability of vision system (F) is taken as equal to the value of frequency of sequence of rhythmic light pulses in Hz: F=1/(ф_imp +t_cr), where ф_imp is the duration of light pulse in sec; t_cr is critical duration of pulse separation between light pulses in sec, defined on the fourth stage of measurement.

EFFECT: method provides for reliable determination of value of vision system lability due to its determination during rhythmic irritation.

1 dwg, 4 dwg, 1 ex