Eye movement analyzing device utilizing pupil center-of-gravity data

Claim 1

An eye movement analyzing device, comprising goggles which can be mounted on and dismounted from an examinee's head having incorporated therein an eyepiece provided near one eye or both eyes, a television camera provided on said eyepiece and focused on the approximate area of an iris of the moving eye for receiving light reflected from the eye to observe eye movement, a video analyzing device for recording and analyzing signals from said television camera, wherein said video analyzing device comprises a tracker connected to said eyepieces, and monitor means connected to said tracker for observing light axes of said TV cameras, and a computer system connected to said tracker, said computer system including output and input means, an autofocusing system for said television camera for automatically focusing an approximate area of the iris according to the amount of eye movement, said autofocusing system outputting pupil center-of-gravity data to focus control means via a pupil center-of-gravity detector and said focus control means adjusting extension of said lens based upon previously calculated correction data so that said focus control means focuses on a proximate area of the iris.