Found this under "Offers For You" (Click the tab that says "Offers For You" right next to tab for "Latest Transactions" on your main page for each AMEX card. Click "Get Offer" to add it to your card.
You can get a pair of prescription glasses with scratch resistant coating from these guys for $95, so saving $10 is nice. My fiance has a pair of these glasses and they are pretty nice and well built. They also donate a pair to the needy for each pair you buy. I'm probably going to pick up a pair rather than paying $150+ out of pocket at my eye doctor (which is after insurance).