Abstract
We have presented an analytical theory approach based on a new image processing technique for measuring eye movements quantitatively. This recently developed system makes it possible to analyze not only horizontal and vertical but also rotatory eye movements simultaneously. The system consists of an infrared lighting apparatus, a very small infrared video CCD camera, a VTR controllable by computer, and microcomputers. Six normal adult subjects were used in this investigation and the maximum slow phase velocity of the rotatory component of caloric induceed nystagmus was found to be 0 to 6 degrees /sec.