TLDR: I'm finding that adjusting to a device requires giving the eyes time to adapt. Start out with short reading sessions and slowly increase the duration. This is working for me.
I've ended up switching most of my reading over to my iPhone. While I'm constantly frustrated at Apple Books' lack of using all the screen space unlike the Kindle App - most of my books are in Apple Books so I've been reading a lot of books on my iPhone 13 PM horizontally with vertical scrolling and that seems to help a bit with the loss of margin space.
I almost always use pure black background with white text with the brightness turned down, but I'm noticing I need a lot more surrounding light when I do this. Usually I read with sepia on my iPad in a dark room (with brightness at 0) - and that worked for me for awhile.
But as my eyes get older and I'm consolidating my devices cuz I'm tired of carrying things around and want to simplify my life - I'm reading on my iPhone and I'm noticing that my eyes are very aware of the difference of reading on an iPad Pro 11 vs an iPhone 13 Pro Max.
I'm finding that my eyes are adapting and it's taking me time to get used to reading on it - but as they do, it's like building muscles and I can read on it for growing periods of time and as such, it's getting more and more comfortable.
I'd been using an iPad Pro 11 for the last 3 years and while it's a great device, I'm enjoying my iPhone 13 Pro Max.
Wow. I never thought I’d see you resort to reading mostly on an iPhone! You’d been so enamored with your iPad Pro in prior posts.
What prompted the change? Just simply wanting to consolidate devices? Was the iPad Pro that much of a hassle after using it for so many years?