METHOD OF REGISTRATION OF DYSMETRIC SACCADES Russian patent published in 2023 - IPC A61B3/113 

FIELD: medical technology.

SUBSTANCE: invention relates to a method of recording dysmetric saccades. The method includes fixing the subject's head, presenting the subject with a visual stimulus, illuminating the subject's eye with infrared light, recording the signal reflected from the eye to obtain a video sequence of pupil images, computer-implemented processing of the resulting video sequence with determining the coordinates of the pupil in each frame of the video sequence, forming a two-dimensional array of values in chronological sequence coordinates of the center of the pupil, corresponding to the frames of the video sequence, from which at least three points are selected by means of segmentation analysis, which are considered the area of gaze fixation. A pattern on a computer screen is used as a visual stimulus, including a background, one peripheral image that serves as a target for performing a saccade in its direction, and one central image, the characteristics of which serve as a signal for performing or not performing a saccade. The central image changes size according to the type of pulsation and/or changes color within one of the two pairs of opponent colors: green — red or yellow — blue, where the first color is a signal for a saccade, and the second color is a signal for its failure. To illuminate the eye with infrared radiation and register the reflected signal, a device is used to study dysmetric saccades. In the method, a video camera is installed in the body of the device for studying dysmetric saccades. The device is installed using a fixing element so that the camera lens is located directly in front of the subject's face. In the method, the focal length of the lens is adjusted and the intensity of infrared radiation is manually or automatically adjusted to obtain an optimal image of the pupil. The upper limit of the energy density of radiation is 100 W/m². The signal reflected from the eye is analyzed in such a way that, in a part of each frame of the video sequence, the area of acceptable pupil location is calculated, while this area has the shape of a square, the side length of which in pixels is equal to the quotient of the dividend and the divisor, where the dividend is the product of the maximum saccade speed and matrix resolution of video camera, and the divider is the product of the video camera shooting frequency and the monitor's gaze coverage angle, while the monitor's gaze coverage angle is equal to two arc tangents from the partial half of the monitor width and the distance from the eyes to the monitor screen.

EFFECT: technical result of the invention is to increase the efficiency of registration of dysmetric saccades.

2 cl