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Martin I thought that I remembered seeing a non- contact gaze detector, but on a quick search I can't find it. Something like the head mouse systems but instead of looking for the reflective dot on the forehead, it looks for your pupil/iris. Does this ring bells with anybody else ? Barry Taylor, Clinical Scientist Bioengineering Department Tulley Medical Physics Building, Hull Royal Infirmary Anlaby Road, Hull HU3 2JZ Tel 01482 675928, fax 01482 675750 > ---------- > From: Wozencroft, Martin[SMTP:[log in to unmask]] > Reply To: A discussion list for Assistive Technology professionals. > Sent: 18 April 2002 09:03 > To: [log in to unmask] > Subject: switch access > > Dear all, > > I am working with a person who has facial expression only. Uses a > ventillator on a trachy. No head movement. > The person can frown, raise eye-brows and grin. > > I have tried EMG ( doesn't like pads on skin ), Liberator P-switch ( > doesn't > like head band ) to pick up on frown. > > Also tried eye-blink. Doesn't like idea of spectacle frame. > > I have experimented with roller microswitch again on headband to pick up > on > frown without success. > > I would be very greateful for any advice anyone can offer. > > thanks > > Martin Wozencroft > Clinical Electronics Engineer > Specialist Disability Service > Mary Marlborough Centre > Oxford > 01865-227600 >