I know the printed font is pretty small in EFAD. If you are having eye strain trouble, (I’m 55 and mine are getting worse all the time), this might be enough reason to get a Kindle. The basic B&W model costs about $100 bucks, and the battery lasts for weeks. You can crank the font up as big as you want, and just click through the “pages.”
I’m reading on a Kindle. My left eye (I think it’s dry eye...will have it checked out next month at my annual exam) starts bothering me if I read too long. Even with an increased font size. Eye drops help, but it still irritates somewhat. I’ll get by, though.