Many folks wear sunglasses when flying RC model planes but if you haven't tried polarized sunglasses then you really should.
Polarized lenses make a huge difference and create a far greater contrast between the model and the sky. If you want to know where I got my "butt-ugly" sunglasses (which can be work over prescription eyeware) then just say, and I'll hunt out the receipt.
Do you wear polarized sunnies when flying?