The prongs that go over the bridge of my glasses are very long, and dug painfully into the bridge of my nose. So I used some snips to cut about 1/8&#34; off each one. They still hurt my nose, even with the plastic sheath. The only way I can wear them for long periods is to stuff padded tissue under the prongs. Also, the prongs have scratched up the finish on my glasses. The polarized lenses work well, if you can stand the discomfort.