ray. but do they? omg so cute. most cost about $10. none more than $20. i buy coach, raybans and smith. each other 100 bucks. $183. to assess true uv protection, dr. fong>> 100% uv protection. >> reporter: all the expensive glasses off it. but now, these are from a mall kiosk. they cost about $20. >> you're getting 100% uv protection. >> reporter: drugstore. >> 100%. >> reporter: h&m. >> 100% again. >> reporter: kids glasses from a street surrender. >> 100%. >> reporter: wow. 11 pairs of discount glasses. they all had the same amount of uv protection as the expensive brands. 100%. but dr. fong explains that expensive glasses often have more durable frames, higher end design, a more comfortable fit and the nice case. rocking the cheap glasses from now on. for "good morning america," becky worley, abc news, berkeley, california. >> i know the difference. i lose the expensive ones more easily. >> never fals. >> that is so true. it's great information. thank you, becky. >>> it's time for "gma's" epic shake it and dance. cam mathison is getting ready to pick one lucky winner to go to the premier on monday. cam, you ready for the danceoff? >> we are all read