Spent around 20 minutes helping my Mum set up her new 16E (a slightly painful experience as she isn't really tech savi at all) - this short period is enough to tell me I'm at the end of the road with iPhone.
The inside edge of my eyes (nearest my nose) feel strained already and I can feel my brain tense around my forehead area. This will most definitely become a headache if I continued.
It's the usual issue of the screen feeling like it's too bright in the centre of my focus - like a torch is being flashed in my vision. If I try to read posts on this thread, my focus strengthens like I'm trying to see through the phone. Any micro movements in my hand and the screen shimmers.