P.S. acrylic is *awful* for contacts, in my experience. Yes it has very good UV transmission (down to 210 nm, as I recall), but it is very prone to static buildup and as such every particle or hair in the room will cling to it. Plus it tend to scratch quite easily. Glass is cheap- get a nice big thick slab and know that once it's lived its life, you can toss it in the trash with a clear conscience.