Bird strikes happen, they aren't uncommon, but they are not a regular occurance for any given pilot.
I've a little over 250 hours at this stage, and haven't had a bird strike. A friend that I fly a lot with has 400 hours, and no bird strikes. So that helps to put it into perspective.
Would you be going OTT if you wore impact resistant sunglasses (like the Mil spec Oakleys) whilst flying?
The chances of having a bird strick, where the bird strike was on the windscreen, and was with sufficient severity to penetrate the windscreen, and in such a location to then hit the pilot in the face, is so unlikely that I have never heard of such an incident. I'm not saying it's never happened, but it's extremely rare.
If it did happen, I can't imagine the brand of sunglasses making the slightest bit of difference. It's a bit like saying if you were punched in the face at full force, would you be better off wearing Oakleys........
dp