Re: Eye detection sensor
The focusing of a digital camera is normally been done by IR. With any IR signal that is to long and too intense you will burn the retina. The exact amount will be different for different age groups, state of health, and a lot of other things.
My suggestion is to setup your device to always have the same distance from the eye. Pre determine the focus and set it manually. Then don't make use of the IR focusing of the camera. In result never impose any IR signal into the eye.