Not necessarily a vanity thing, it's also a pain in the ass and a life long expense. Do you know how many times I've woken up and found my glasses fell some where and I can't find them? Or the screws loosened and a lense fell out while I'm out doing something? And a pair of glasses can run you anywhere from $200-$800+ every few years, let alone the optometrist appointments to get your prescription updated.
If you need your glasses prescription updated then the Lasik correction you had also no longer works, you still need the optometrist appointments to check eye health. A new pair of glasses can be had for a lot less than $200 as well.
I don't think the mom's laughing if she's blind. Yes, it's a pain in the ass, sometimes, to have glasses. But no, I'm not paying for lasik for my kid who needs glasses/contacts.