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I was wearing eyeglasses many years. Last year I got a visus eye operation, I donīt need glasses any more. If you can afford it, itīs amazing.
The M9, with glasses? Forget it. With DSLR glasses are fine, but be careful to order small glasses, when you can touch the upper rim of the viewfinder with your eyebrow (not the glasses) then you will be fine. Nikon and Canon is fine, but I used to remove the viewfinder-cover from the Canon, much better that way.
So generally, no problem. Oh, one, when you come in from a cold outside into a warm room, your glasses will fog, but your camera also, so not limiting (0: