16-02-2013, 04:07 PM
EYE GAZE COMMUNICATI ON SYSTEM
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ABSTRACT
The Eye gaze System is a communication and control system for
people with complex physical disabilities. You run the system
with your eyes. By looking at control keys displayed on a screen,
a person can synthesize speech, control his environment (lights,
appliances, etc.), type, operate a telephone, run computer
software, operate a computer mouse, and access the Internet
and e-mail. Eye gaze Systems are being used to write books,
attend school and enhance the quality of life of people with
disabilities all over the world.
INTRODUCTION
Imagine yourself being a intelligent, motivated, and working person
in the fiercely competitive market of information technology, but
just one problem You can't use your hands. Or you can't speak. How
do you do your job? How do you stay employed? You can, because
of a very good gift from computer Industry: The Eye gaze, a
communication & control system you run with your eyes. The Eye
gaze System is a direct-select vision-controlled communication and
control system. It was developed in Fairfax, Virginia, by LC
Technologies, Inc.,
2.Who's using the Eye gaze System?
This system is mainly developed for those who lack the use of their hands or
voice. Only requirements to operate the Eye gaze are control of at least one
eye with good vision & ability to keep head fairly still. Eye gaze Systems are
in use around the world. Its users are adults and children with cerebral
palsy, spinal cord injuries, brain injuries, ALS, multiple sclerosis, brainstem
strokes, muscular dystrophy, and Werdnig Hoffman syndrome. Eye gaze
Systems are being used in homes, offices, schools, hospitals, and long term
care facilities. By looking at control keys displayed on a screen, a person can
synthesize speech, control his environment (lights, appliances, etc.), type,
operate a telephone, run computer software, operate a computer mouse, and
access the Internet and e-mail. Eye gaze Systems are being used to write
books, attend school and enhance the quality of life of people with disabilities
all over the world.
The skills needed by the user:
Good control of one eye:
The user must be able to look up, down, left and right. He must be able to fix
his gaze on all areas of a 15-inch screen that is about 24 inches in front of his
face. He must be able to focus on one spot for at least 1/2 second.
● Several common eye movement problems may interfere with Eye gaze
use. These include:
Nystagmus (constant, involuntary movement of the eyeball):
The user may not be able to fix his gaze long enough to make eye gaze
selections.
Adequate vision:
Several common vision problems may affect a user's ability to see text clearly
on the Eyegaze monitor. These include the following:
Inadequate Visual acuity:
The user must be able to see text on the screen clearly. If, prior to his injury
or the onset of his illness he wore glasses, he may need corrective lenses to
operate the Eye gaze System. If he's over 40 years old and has not had his
vision checked recently, he might need reading glasses in order to see the
screen clearly.
In most cases, eye tracking works well with glasses. The calibration
procedure accommodates for the refractive properties of most lenses. Hardline
bifocals can be a problem if the lens boundary splits the image of the
pupil, making it difficult for the system's image processing software to
determine the pupil center accurately. Graded bifocals, however, typically do
not interfere with eye tracking.