Smith Optics' Aegis Eye Shields come in what the company calls a Field Kit. It includes the frame, three sets of lens, a neck retention leash, a cloth storage bag, and a cleaning cloth. The lenses are easy to change, using a built-in rotating hinge system. The glasses meet Mil-Spec standards, have distortion-free and anti-fog lenses, and offer 100 percent UV protection. An Rx adaptor is available. Available from numerous merchants for about $80.