I like those glasses.
Alas, I already wear a pair, and I don't think I can get anything remotely like that for my prescription anywhere nearby (or for prices I could afford).
I'll definitely try again at some point. I gather iOS 7 seems to have broken various apps. It might also be that particular file, as it seems to crash most apps I've tried it in (apart from Adobe's PDF reader and iBooks). Hmph. Maybe I should just convert it into epub or mobi and put up with the horrible formatting, but the page numbers and headers/footers all over the text really aren't appealing, and I don't think I feel up to physically removing them all (and manage to not spoil myself for the book while at it)...