It seems like twenty dollars is the going rate for the scratch coatings. As far as effectiveness most of the eyeglass companies will warranty a scratched lens for six months to a year with free replacement. When you get the impact resistant lenses ALWAYS get scratch coatings because the lenses are softer than the standard lenses and will scratch easier. <br><br>If you are looking for frames that seem to hold up better than average go with the titanium nickel alloys. These are the ones that can be wadded up into a ball and spring back into shape just as soon as you let them go. Just don't go showing this to all of your friends, you can still break them if stressed to much. Very light weight but a bit more expensive than standard wire frames.