Maybe a mini-version. You look up fresnel lense in the book of all knowledge, and it talks about lighthouse lenses for pages and pages, in the fine print near the bottom it kindasorta skips over the little flexible plastic thingies.

Cut me some slack OK, I'm older than dirt, had a hard day, didn't sleep well last night, missed lunch, am older than dirt, didn't get my after dinner toddy, am older than dirt, it's Jimmy Buffetts fault, the excuse list goes on and on...