It may depend on what insurance if any they have to cover the costs. Also some people just never have any problems with their vision.I wonder how many pool players actually have their vision checked after the age of 40 on a regular basis.
I never had a problem and never needed glasses till my mid fifties. Then I just started to need bifocals. I am 71 now and have gone in for eye exams at least every two years since then. I use Snookerspex glasses for pool. Regular glasses just don't even come close when playing pool.
There are a few different places online for getting billiard glasses if you do a search for them.