Thanksnfor the input. I got some oakley lens puck that slightly smaller than a medusa lens, like 1-1.5 mm short compared to my spare lens. I will try it hopefully it works. I will then have etched medusa lens lol..
I just need to know how to remove the lens retained on the inside of the goggles. I saw one youtube video it was removed but the guy has not reponded to my query.