You could also look at screen readers, BTW. Can recommend Google TalkBack for Android. iOS has its own which is also quite good based on what I've heard.
Voiceover on iOS is really good. I'm totally blind and have been using it since 2010. One thing to consider is that when using a screen reader bigger may not be better. When I've used an iPad, I've had issues with spacial awareness finding things on the screen because it's so large. I don't have these issues on the iPhone. I realize that if someone still has some vision then bigger may be better.
