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To assess true u.v. protection, the doctor uses a speck trow photometer. these are from the mall kiosk. they cost about $20. >> 100% uv protection. >> drugstore? >> 100%. >> h & m? >> 100% again. >> kids' glasses from a street vendor? >> 100%. >> 11 pairs of discount glasses all had the same amount of u.v. protection as expensive brands. 100%. but dr. fong explains that expensive glasses often do have more durable frames, higher end design, comfortable fit. and the nice case. >> reporter: rocking the cheap glasses from now on. becky worley, abc news, california.

Can you get safe protection for your eyes for fraction of the price? abc's becky worley investigates. ♪ >> reporter: designer shades. they promise to block 100% of uv rays. but do cheaper sunglasses provide less protection than the expensive ones? >> ultraviolet light will age your eyes faster. >> reporter: the doctor, professor at uc berkeley school of optometry, says it can cause an early onset of cataracts, macular degeneration even growths on your cornea. to see if cheaper sunglasses can protect against these vision issues -- see, protected -- i buy sunglasses from from mall kiosks, even...