Isnt that a Fresnel lens ? http://en.wikipedia.org/wiki/Fresnel_lens http://en.wikipedia.org/wiki/Fresnel_lens They have been around for a while. I remember som

Isnt that a Fresnel lens ? http://en.wikipedia.org/wiki/Fresnel_lens http://en.wikipedia.org/wiki/Fresnel_lens They have been around for a while. I remember some plastic ones come free with books that have very fine print. So was the novelty of it all putting them on eye glasses ?