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From: csilva@maestro.mitre.org (Carlos Silva)
Newsgroups: comp.human-factors
Subject: Re: Eye Movement Tracker
Message-ID: <1991Jun19.122929.27077@linus.mitre.org>
Date: 19 Jun 91 12:29:29 GMT
References: <164661@felix.UUCP> <1991Jun14.172700.4446@cbnewsl.att.com>
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Reply-To: csilva@maestro.mitre.org (Carlos Silva)
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Yes they do exist and function by using to reflection points on the eyeball.  When the reflection point on the surface of the eye moves, the cursor moves (simplified explanation).  They are excellent and fun to use, we had one by LC technologies (60k or so) at the Contel Tech Center Intelligent Systems lab, now merged with GTE Laboratories where the eye tracker was sent.  

However, the eye tracker does not let you move your head more than 1-3 inches or the light that is shining on your eye will miss your eye.  LC is designing a device that will track head movement within a 12 inch square area so that it will work more naturally.  There are already eye trackers that do this but they are in the 100K-150K range.

carlos silva