I don't know if you are talking about Loops that fit around your head and the lens flips down. I use them for most of my hand work. Mine was purchased by a dentist friend through his supply source, but you can google and find them on line. They are a little on the pricey side (about $150), but well worth it when I'm hand quilting. The downside is you can't watch TV while you are using them. Mine came with three strengths of lens. I've also used and still have some loops that I bought in Hobby Lobby. They were in the $15 - $25 range, but worked. I also use the lens that clip onto your glasses. They work well for those projects that don't require "fine" stitching. I purchased those at Keepsake Quilting, and I think they are around $15.