My eyes are pretty sensitive when reading on an LCD as well. I'm fine for 15 or 20 minutes but then I have to stop or I can't read for several hours. I do read a lot on my phone when I'm away from home.
I think the key to maximizing your reading time on an LCD is to keep the light dim as possible. I always dim it to beyond the point where I'm comfortable and leave it there till my eyes adjust, increasing the brightness a bit if needed. I'm still limited to 15 or 20 minutes reading but at least I get that.
I don't read on tablets because they're too large for me. I prefer smaller screens.
I think the difference in reading on an LCD and using the laptop screen is that when reading I'm staring almost unblinking into the screen where when browsing the web or watching a video I'm always looking away and back.
Are you really stuck with PDF? I realize that some things don't convert easily but have you looked into converting your PDFs with Calibre into something that flows? It's fast and easy if it can do it.
Barry
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