The rising sun in your face.
The sun glasses are probably a bad idea depending on how high up you are in your tree, I would try to manage without them. but what is more important than that is your shadow, i try to keep the sun at my back if at all possible so i can see my shadow. lots of newer hunters get busted because of the movement of there shadow. even if a deer is facing away from you, you can still be busted. be aware of it. i have a checklist that i have drilled into my head over the years that i do every time i get in my stand, and finding and tracking my shadow is one of them. every so often i will slowly stand up and see where it falls. more often than not it determens when and where i will make my crucial movements, like drawing my bow. good luck to you and may many more deer grace your table.