Eye tracker is a small device that is installed at the bottom of the computer screen. Just look at the computer screen and control the mouse cursor with your eye movement.
Eye Control feature in Windows 10 combined with Eye Tracker enables full computer access on a Windows PC via eye gaze, replacing the standard keyboard and mouse.
The camera reads the reflection of light in the optical system of the eye. The resulting image is analyzed, the angle of reflection is determined and the direction of view is calculated. When a person uses a virtual keyboard, a computer program recognizes that he is currently looking at, for example, the letter "R", and displays it on the screen.