What ever you do, never buy from this company. I bought a pair of single lens glasses in glass and Transaction. The glasses were sent to my eye clinic, and did nothing to mute the sun, even the girl at the clinic said they did not get darker in the sun. The clinic sent them back to this company, and they just sent them back, saying that in glass the glasses would not get darker. That was $180 wasted to a company named Nautical Optical Lab.