Leave the sunglasses – It may be bright out, but your eyes will adjust. Sunglasses will not stay put, and they will obstruct your view once they get wet or muddy. You’ll have no way to clean them because you too will be wet and muddy. There’s also a good chance that they will get lost or broken.
If you must wear glasses, some people try goggles. We’re not really a fan of that either. We’d suggest heading to the local gas station and finding a cheap pair of sunglasses that you don’t mind losing. You can put on the trendy shades after the run.