1.) Adaptor Frame Select 720 Rx models feature an Adaptor Frame for simple switching between normal to prescription lenses. Light and unobtrusive, they’re a great alternative to irritating and fussy contact lenses. * Suitable for prescription lenses below -4.0.
2.) Rx in-Frame Specially designed frame sockets allows interchangeable prescription lenses to fit right in, replacing older "clip-on" lens holders for extra convenience and comfort. Whatever your vision, these lenses are the right prescription for cycling, trekking, running, and just hanging out under the sun. * Suitable for prescription lenses below -6.0
3.) 720CRX In partnership with professional optical labs, 720armour offers customized prescription lenses on wrap-around style sport frames under the CRX designation.