More conversion software:
Quartz filters don't work on jpeg 2000 and don't convert tiled images to single images. pdftk is Windows-only. jpdftweak doesn't convert tiled images either. I can't even figure out what pdfr in the wiki is:
https://wiki.mobileread.com/wiki/Conversion_matrix
Kindle software:
KOReader doesn't work well on older Kindles. It's slow, it's designed for touchscreens, it's hard to navigate the menus using the buttons, and it's impossible to set certain settings like "always open pdfs in page view" without manually editing the config file.
Reading glasses over regular ones:
Migraine trigger.
Reading glasses without regular glasses:
"I see a big light blur."