That was one of the five sites I found for eyeglass materials. These are the others:

- http://www.allaboutvision.com/lenses/how-to-choose.htm

- https://web.archive.org/web/20090815102701/http://www.hbutz.... (table at end)

- https://en.wikipedia.org/wiki/Corrective_lens#Ophthalmic_mat...

- https://web.archive.org/web/20160322110111/http://www.optica...

Trivex is impact resistant and lighter but it's also a little thicker than some of the high index materials so the weight ends up being the same. MR-8 was the one I hadn't heard of and was most curious about.

https://www.reddit.com/r/AskReddit/comments/4v3ts4/what_was_... has some notes about scratch resistance

With high index lenses, the chromatic aberration (low "abbe number") was annoying me (see ScottBurson's post), especially on a wide screen monitor. I ended up getting lenses made of glass. But these aren't so great outdoors because you don't want shattered glass in your eye.

I ended up getting glass for use at home at the computer and MR-8 for the rest of the time (hiking, driving). For the computer lenses, I got a slightly lower prescription (-4 instead of -5) and they're a lot more comfortable for reading (people may find these useful after the age of 40). I think next time I'll go for CR-39 instead of glass, as the glass lenses are rather heavy.