I bought Scott illuminator goggles, through Amazon Prime it was $30. http://amzn.com/B007WEPXVI The illuminator lenses are great and actually help me see more detail at night (when there are street lights around or using my bike light). Also removed the glare of snow during daytime. I wear those over a "Chaos -CTR Howler Multi Tasker Pro Windproof Balaclava" which I also got on Amazon. http://amzn.com/B002ZG7RGM That thing is amazing and has kept my face warm even under -20F wind chill.

I went with goggles because I wanted to cover the space in the balaclava, so that the freezing, burning cold air is not hitting my face. Sunglasses or safety glasses won't help when you're facing a very strong wind and racing downhill against it providing a -30F or lower wind chill. Winter biking for me is all about comfort. I want to feel like I'm in a space suit.