I recently replaced lenses from a frame I hadn't worn for a while after I had corrective surgery and no longer needed any refraction in my lenses. The process was easy, straightforward and fast. Because mine was not a frame they have blanks for, I had to send in the frame so they could custom cut the lenses. I used my own box (faster), and start-to-finish was about ten days. The lenses are very high-quality polarized green, with an anti-reflective coating and were super simple to get back into the frame. They look great. There's a bonus: once you've sent a frame to Tajima, they keep the measurements on file which makes it even easier to order replacement lenses (if you break one) or a different color or shade.