Back in high high school I was helpless seeing my paralyzed father every day in bed. In 3rd year I thought of making a device through which a patient can be independent. So, I came up with an idea of controlling electronics through the eye, in my case an "eye controlled mouse."
If a person concentrates on an object his pupil contracts and relaxes; i.e radius will change that will detect whether he wants to use this device or not. Depending on screen the person will have a fixed radius of pupil.
Now, a pointer will move according to the motion of the center point of the pupil and blinking of eyes (double blink ) will act as a select.
So, if a mouse pointer can be controlled then through a PC everything can be controlled.