Hey there. I have been wearing prescription glasses of power -6.50D, and the fat lenses on my glasses always made me think I looked like a dork. It wasn't until very recently I figured that a frame of the right shape and size could significantly reduce the thickness of my glasses. I built this simple tool for myself for whenever I have to get a new frame. If you happen to have the same issue, try it out and please let me know what you think! :)