How's the difference in scratch resistance? I was concerned that all the salt from my abundant sweat drying on the glasses would scratch the lenses when I clean them. I've always gotten real glass until the ones I got a couple of weeks ago, because I keep my glasses for ten years or more. I still have virtually the same prescription I got 23 years ago (only 1/4 diopter different, which is the minimum).
BTW, I find plastic (polycarbonate) is more difficult to get smear-free when cleaning than glass is.
I finally got new normal glass lenses this winter after 10-12 years because I'd worn off the scratch-resistant coating. Poly is usually softer than glass, and it's difficult to get a hard coating to stick to a softer substrate. I'd suggest you try rinsing your new glasses in the sink (running water) when possible. Doesn't do much for wiping sweat off on the road, I know. :/
unless you know why you might want the additional impact/shatter resistance.
When I mentioned glass to the people at the glasses store next to the optometrist, they thought that was terrible because it could shatter and get glass in your eyes. I told them that when we were kids, they were all
glass (tempered, unlike what our grandparents had), and we all got hit in the face with balls on the playground many times, and the glasses never
broke on our faces. Never. What did happen sometimes is that the glasses would get knocked off and fall and, on very rare occasion, break when they hit the concrete-- but never on our faces. One woman there had a "horror" story about someone she sold glas to who got in a car accident and the edge of the lens was pressed into the skin above the eye and cut it; but the lens did not break. It only got popped out of the frame. The same thing could have happened with plastic.
Same here. The only lenses I broke were my first ones, when they fell out of my book bag and the neighbor ran over them with her car. However, to get my new high-index light weight blah-de-blah lenses I had to sign a waiver to acknowledge they were too thin for federal regs. Should I wear goggles while road cycling?