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From: pilgrim@daimi.aau.dk (Jakob G}rdsted)
Newsgroups: comp.human-factors
Subject: Re: Eye Movement Trackers
Message-ID: <1991Jun16.032943.20068@daimi.aau.dk>
Date: 16 Jun 91 03:29:43 GMT
References: <91Jun14.160659edt.6227@neat.cs.toronto.edu>
Sender: pilgrim@daimi.aau.dk (Jakob G}rdsted)
Organization: DAIMI: Computer Science Department, Aarhus University, Denmark
Lines: 37

mgreen@cs.toronto.edu (Marc Green) writes:
>king of them all is the SRI double Purkinje tracker which detects
>changes in the position of the Purkinje images in the the eye.
>(Purkinje images are create by the different refractive indices of
>different ocular media. All you need is about $60K and you have one of
>your very own. There are also cheaper methods, glasses that bounce
>infrared beams of the eye, EOG's which measure activity in the
>ocular-motor muscles, etc. These have problems with accuracy and
>reliability and many operate only in the horizontal plane.

>All trackers require careful and frequent calibration.  Further, It is
>not easy to tell where a person is looking, even if you know the
>position of the pupil; there is a big difference between knowing the
>position of the eye and the locus of gaze. People also make many

How do they cope with the relative position of the head and the screen?
Am I to hold my head absolute still?

>involuntary eye movements, so a tracker would unintentional cause

Consider the aforementioned cursor. Are you saying, that just as I am
about to press the activate button, my eyes may flicker? (i.e. can one
have trouble "fixing" ones looking direction)

>actions to occur. I don't think that eye trackers will ever become
>popular. Just too many problems.

I hope they will become popular, and I expect our technology to advance
so as to solve this. It is just too great an interface to miss...

>Marc Green
>Trent University
--
From the notorious
                      Jakob Gaardsted, Computer Science Department
Bed og arbejd !            University of Aarhus,  Jylland (!)
(Pray and work!)  AMIGA!  pilgrim@daimi.aau.dk | I'd rather play Moria.