For a long time, I had “rimless” glasses - the frame was basically a wire that ran along the top of the lenses, and had small fittings for screws that went through the upper part of the lenses to hold them to the frame. Because the frame was so minimal, it didn’t draw attention to the thickness of the lenses, so many people who saw me every day didn’t realize how thick the lenses actually were.
I also had HI lenses; the outer edges were 3/8" to 1/2" thick, while the inner edges were about 1/8". I shudder to think of how heavy they would have been if they were glass.
