Do glasses disqualify you from Class 4 Flight physical for 15q?

Correctable 20/20 vision DOES NOT disqualify you from performing ATC duties. The only vision ailment that'll prevent you from passing a flight physical is color blindness. Color recognition is an absolute must in aviation. I'm a 15Q by trade and am currently a 1SG of an ATC Company and I'll tell you that I've served with many controllers and aviators who wear glasses. The flight doc will simply anotate on your upslip (flight physical) that you need glasses to perform aviation duties. Aviation also tends to get favored for corrective surgery so if you do decide to make the transition lasik will become much more accessible to you. If you have any more questions about ATC let me know.

You need to contact a recruiter, retention NCO.
As I understand it, as long as the persons vision is correctable to 20/20 they should be ok. But again, not my field so I could be wrong.

As a 15q and probably way late to this party, as long as it can get corrected to 20/20 or better you will be alright, I have many in my unit that have glasses and another controller that's a walking dead man. As long as you can hear/see you'll be fine.