CR-39 is allyldiglycol carbonate, according to the patent (4594288).
"Lenses of allyl-N-ethylene glycol carbonate having enhanced resistance to scratching or abrasion can be formed by preparing a substrate of a polymer or copolymer of allyl-N-ethylene glycol carbonate, the substrate being at least partially polymerized. A thin film of a copolymer of allyl-N-ethylene glycol carbonate and of an allyl monomer is formed by overmolding on the substrate and polymerized."
(Well, didn't you want to know?)

Acrylic eyeglasses seem to be made mostly in China. Many colors and designs, reading glasses, etc. Lenscrafters 'FeatherWates' seem to be made of acrylic. Couldn't find anything authoritative on types or use in prescription glasses.