METHOD FOR STUDYING DIPLOPIA Russian patent published in 2023 - IPC A61F9/00 A61B3/00 

FIELD: medicine; ophthalmology.

SUBSTANCE: fields of vision are separated using red-green glasses, luminous objects are presented, double images are combined after the image is presented, and the relative position of the double images is estimated. The study is carried out sequentially from distances of 1 m and 3 m, corresponding to a view near and far, while a tangential grid is projected onto the screen with the radii of the circle corresponding to this distance, corresponding to marks 5°, 10°, 15° and 20°. Meridians are applied radially on a circular scale from 0 to 360°. A red cross is projected into the center of the grid using a projector. Start the study with the head position to the left/down, while the gaze is directed to the right/up; being in this position, the subject, with the help of his pointer, "covers" the cross projected in the center of the screen, trying to combine the crossed lines so that both crosses coincide. In the presence of diplopia, these images do not match; the position of the red cross is marked on the screen by the subject using the computer “mouse” displayed on it. Next, the patient moves his head to the right in such a way that he looks at the “frowningly” mark. While moving his head, he holds his pointer in such a way that both crosses are always aligned. The speed of head movement will reflect the speed of adaptation of the sensory system to doubling and will be the higher, the faster the patient can track the discrepancy between the two images and correct the position of his pointer, while objectively changing the position of the red cross on the screen. His new position is again fixed by the researcher; then the patient continues to turn his head to the right, while looking up/left. The next position of the head is to turn to the left, while the gaze is directed to the right. Next, the patient turns his head to the right through the central position, at the end point the gaze is directed to the left; the third stage — the head is raised and turned to the left, the gaze is directed to the down/right, the patient turns his head to the right without lowering it, while the gaze is always directed down, at the end point — to the down/left. At each point in time, the pointer of the subject covers the projected cross in such a way that they are completely aligned according to the subjective perception of the patient, but objectively, the position of the cross from the pointer of the patient changes. Based on the results of the study, the displacement of the imaginary image in different positions is evaluated, as well as the dynamics of changes in the relative position of two images with the same direction of gaze, thereby assessing the rate of patient adaptation to changes in diplopia.

EFFECT: method makes it possible to increase the informativeness and accuracy of diagnosing diplopia due to the possibility of an objective quantitative assessment of diplopia during a change in the direction of gaze and assessment of diplopia for near and far distances.

1 cl, 2 ex