TARGET DEVICE USED IN EYE MOVEMENT TESTS

A target device used in an eye movement testing device made up of a light group and a refractor. The light group includes a plurality of light sources lined-up side by side behind an window which opens in the front wall of the casing of the testing device, and the refractor is installed to cover the window from the outside of the casing and face the eye to be examined. When the light sources are successively lit on and off, moving virtual images of the light sources are created so that the images which are expanded (to be longer or higher than the light sources) can be seen through the refractor. Thus, the eye movement (nystagmus) induced when the eye follows these types of moving images, is observed.