Further to what Nick said, above, the FAA also has a document about sunglasses for pilots. It's in the Health section. It talks about desirable features and characteristics of sunglasses, not brands, but you can use the information to shop for the kind that's best for your situation.
Here's the link:
FAA: Sunglasses for Pilots
(It's a 3-page 'pdf' document.)
Hope this helps.