I am legally blind due to non-age related macular degeneration so central vision is pretty well gone. However, with magnification, I can still read.
I have found that Kindle books work well.
I also have a couple closed circuit tv magnifies that look similar to your scanner. You can place a document or book beneath it and magnify it as much as you like and change the color scheme to suit your needs. The one most used is a desk top with a 24” screen. I found many to choose from on ebay.
Hang in there.
Thanks. I’m 73 and I figure this is going to continue to get worse. Right now it is stable. Fingers crossed.