Get on your bike or go off-road in a jeep or a buggy!
Some stores offer a "test range" where you can "test drive" goggles, either on your bike in a controlled area or by simulating different conditions with assorted light bulbs and electric fans to imitate wind.
Stay aware when you are on your bike - don't wear a personal stereo or use a mobile phone whilst cycling.
When you are on your bike and going very fast, the last thing you need is to have anything impede your sight.
So where do you shop for your goggles or sun glasses before hopping back on your bike?