Do you know of an existing application (e.g. for android) that automatically monitors how long you've been staring at your screen and suggests you to pause after a while ?
Pause reminder apps are common, but you'd often forget to hit "start", for example when you're answering to a text conversation.
One way of doing that would be by analysing front camera snaps, or the accelerometer for a cheaper approximation.
I believe it could be beneficial for our eyes, but our social life and productivity as well.