The eye tracking thing I've tried doing at some point, a few years back. Unless you have hardware to support running neural networks it turns out to be way too

The eye tracking thing I've tried doing at some point, a few years back. Unless you have hardware to support running neural networks it turns out to be way too power-consuming, even if it's push-to-point (you have to depress a key to move the pointer to where your eye is/was). A4 format would be great, yes.