I use this when I'm machine quilting. I wear bifocals and was having a horrible time because I am nearsighted. This works for me. I can see each stitch close enough to sew right over the top of it in a straight line. I won't machine quilt without it.
http://www.simplicity.com/p-5219-cc-...magnifier.aspx My only complaint is the light on it is pretty much useless.
I bought it at Walmart for $19.