I used to use a Gamespotter Hat/Mask combo from Mossy Oak and my glasses always fogged up so I went back to the mesh material for a mask.
Now I' m seriously thinking about contact lenses, not just because of the fogging problem, but for binocular use, AND I can go back to wearing cool sunglasses. [8D]
Never had a problem with spooking birds though. I always wear my hat brim low to cast a shadow over the specs.
NOW I need to make that Dr' s appointment. Turkey season is coming up FAST!