What does it mean if you loose your eyesight from smoking pot?

I smoked some weed with my friends and when I was standing at a concession stand my eyesight slowly started to go away kinda like when you stand up and youre lightheaded. Well my sight was completely gone for a few minutes, my eyes were wide open and I looked normal but couldn't see. I was wondering if this is related to glaucoma in any way or just what happened. This only happened once and it wasn't my first time smoking