Some of the coatings they use on glasses scratch really easily - beware. There are some high quality coatings available though. One was guaranteed not to scratch for up to a year. I dont know if the a/r units will be able to process something that isnt round and not larger than 80mm. There is a process that will put a titanium a/r coating on lenses, but they have only done it on real small lenses so far.

Sean