when the time came for mechanical adjustment of my focus length i couldn’t find a model of glasses i liked so i made my own.the frame is made from carbon fiber and the “glasses” themself are bought from a 100yen shop and are made from cheap reading glasses and cut by a fine saw. The whole construction is glued together with 5-second crazy glue. the disadvantaged of the glasses is that they can not fold. so they have a special case.