I don't have a problem with it and my wife absolutely loves to cosplay but I've just never felt the urge to dress up. It just seems like so much hassle for the most part. My wife actually gave a textbook example at this-she dressed up as "bedtime Harley" for the last con we went, but refused to wear her glasses because they didn't go with the outfit/didn't look sexy enough. She couldn't see more than a few feet in front of her so whenever I pointed out something cool (there's James Marsters! There's Stan Lee! There's Henry Winkler!) she couldn't see and it was just annoying until I finally convinced her to put on the damn glasses.
Yeah, I've never been able to do contacts because I'm just too twitchy when I try to put them into my eyes, so I've stuck with glasses since I started needing vision correction. Luckily my eyes aren't that bad and I can see reasonably up to a rooms length or more away without them on (then stuff gets more and more blurry the further out it is), but my eyesight is slowly getting worse and I can feel it a lot more that I can't see details on stuff, for instance at Fanime this year I actually ended up going back to the Artist Alley because the first time I was in costume and couldn't actually get a good look at the artwork unless I was right up close so I was able to see some stuff that I didn't notice because I didn't close enough to actually tell what it was without my glasses on.
Another issue I used to have was viewing subtitles when I would go into viewing rooms in costume, but I haven't done as much of that lately, and I usually bring something like a semi matching purse to carry stuff for each of my costumes (everyone really likes the silly super cute pastel bear one I use for Teddie, haha), so for the ones where I had extra room I would sometimes bring glasses to put on when I actually needed to see stuff far away.