Abstract
The evoked reflex movements of eye produced by a simple light stimulus and the objective measurement of the visual field of the mentally retarded children were studied. The subjects were 77 children (MA 2 to 10), belonging to the special school for the mentally retarded. The stimuli presented were the small luminous points arranged in the hemispherical bowl. Eye movements were measured with electro-oculographic technique. The findings are as follows: 1. Three different types of reflex movements are classified, and each type is correlative with particular stages of MA. (A) The very high frequent reflex movements were produced in the children with MA 3 to 5. (B) The frequency increased remarkably as the light stimuli were signalized (Remarkably found in the children with MA 5 to 6). (C) The children with MA over 7 showed the rapid inhibition of the reflex under the all conditions of the experiment. 2. The objective visual field on the horizontal meridian could be obtained from all of the subjects. 3. The reflex movements of eye was proved to be a useful indicator for the objective measurement of the visual field of the children with MA 2 to 6.
