A:AnswerThey do come with a prescription insert "sample". The manual has a QR code that takes you to their prescription lens ordering page. The prescription inserts cost 95 pounds (UK based operation).
However, you cannot use these in the way you are asking. These glasses are a closed (sort of) system. You cannot see through them (sort of). They were not designed for AR. At all. Any translation would have to be done by your phone or attached device if possible.
A:AnswerIf you enter your zip code into the Best buy app or website, it and click "In-store" "In stock nearby", or similar. I haven't heard of any stores having display models to test.
A:AnswerNo. The image is fixed and when you turn your head the display follows. It takes a lot of getting used too, especially with 1st person gaming or perspective. You have to learn to control the urge to turn you head to focus on action or objects that your virtual perspective show to the sides.
