1. Very cool concept and good execution. Your site is well designed.
2. On the homepage, it says "A ditto is a virtual you.", but it's not immediately clear why I would want one. Maybe change the copy to "Create a virtual you to try on glasses online." or something like that.
3. I expected to be able to click on "Free RX Lenses", "Free Shipping and Returns", and "Fresh Styles". This should take me to the "Learn more" links.
4. When I went to create a Ditto, I was confused by the "You'll need a (webcam) + (credit card). I almost bailed at this point because I thought I'd have to pay to create a Ditto, which didn't make any sense.
5. Otherwise, great job and keep up the good work.