This is a good article on eye gaze systems.
http://www.als-mda.org/publications/als/als-curr.html#eyes
 
Check it out.
 
Alisa

Alisa Brownlee, ATP
Clinical Manager, Assistive Technology Services
ALS (Lou Gehrig's Disease) Association, Greater Philadelphia Chapter
 
Assistive Technology Consultant, ALS Association, National Office

Direct Phone Number: 215-631-1877