Are you thinking bout the tru-glo peep? It has a slide on it where you can allow 4 dot's to show around the peep or you can put it on medium brightness or off. You use a bit of plastic tubing to pull it around to center on every draw. If that's what your looking for it works well. If it's not then nope I havent heard of it. Other than a regular peep. Check redhead magazine of bass pro shops. They have a ton of different peep sights.

Good luck.