Yeah keeping your eyes fresh is huge. I read somewhere that eye fatigue is a real thing that messes with your focus on detailed work. Makes total sense.
The 20-20-20 rule actually works. Look at something 20 feet away for 20 seconds every 20 minutes. Also remember to blink, you'd be surprised how much we stare without doing it.
Ever get ear fatigue from headphones too? Kinda like what @murphy.barbara said about eyes, my ears need a break from podcasts to actually hear my thoughts later.