Frames bought on the Internet are less likely to fit properly.
The Telegraph reports that according to a British study, glasses bought online pose a safety risk. The article says a College Optometrists study of glasses sold in the U.K. found that 27 percent of frames bought online were unacceptable, and 9 percent were unsafe. That's versus 10 percent unacceptable and 5 percent unsafe among glasses that were fitted in stores. Problems cited by the study include poor fit and incorrect measurement of pupillary distance. Elderly patients in particular are cautioned against using the internet to buy frames with bifocal and varifocal lenses, as they require careful fitting.