Not sure if IR causes any damage to any tissue in the eye. UV will cause cataracts, but the canopy filters out most of that. They don't mention any AR coatings (like Maui Jim) which are very effective at increasing contrast..

Unfortunately I need readers to see the instruments, and prefer polarized lenses to see other gliders (I know many don't like polarized, but I do...). SunCloud brand seems to do the trick with high quality, a good stock selection and a reasonable price at $30-$85 http://www.amazon.com/s/ref=nb_sb_no...ncloud+readers

Matt