DEVICE AND METHOD FOR DETECTING AND MEASURING ASYMETRY RIGHT EYE-LEFT EYE BETWEEN ZONES WITHOUT BLUE CONES OF FOVEA OF EACH RETINAL IN HUMAN

摘要

The invention relates to a device for detecting and measuring right eye asymmetry - left eye, never observed, for areas without blue cones in the center of the fovea of each retina, and a method for assigning a coefficient of ellipticity to each retina. The device comprises, in particular, a frosted screen (12) illuminated by a source (11) emitting a white light whose spectrum is similar to that emitted by a blue sky. This screen (12) is placed at the exit of a conical system (13), about 2 m long. A lateral displacement in front of the eye, of a double green and blue filter (14,15) makes it possible to observe through the green filter a light green entoptic image on the screen, about 2 cm in diameter, this image being due to the absence of blue cones in the center of the retina. A control device consisting of another blue filter may be inserted into the system, the entoptic image then appearing pink when the filter is rapidly moved away from the eye. A graphic tablet (19) connected to a computer (18) allows the observer to raise the profile of the zone without blue cones of the fovea of each retina and thus obtain the two recordings called fovéagrams. Moreover, the measurement of the ellipticity rate for each eye makes it possible to qualify the degree of asymmetry right eye - left eye. The device and the method for measuring the ellipticity rate of each zone are intended to describe the stability or instability of the ocular dominance which may be crucial for disorders of vision and dyslexia in particular.