MadePancakesOnce

for the record, your english appears to be perfect

I've heard it as the 20/20/20 rule: every 20 minutes, look at something 20 metres(feet?) away for 20 seconds

or have your character practice magazine retention

edit: apparently this is unrealistic

Brain

You may have made a fatal mistake my friend

retina is inside your eye, at the back. the curvy bit at the front of your eye is the cornea