Had an interesting seminar at the office yesterday. Our Eschenbach low vision rep came around and did an hour long talk about the various low vision aids they offered... one of them really caught my eye. They were high-plus readers (anywhere from +8 to +24)... but they were THIN. The +24 looked like it was the thickness of a standard +2.50. The rep didn't have any real technical information about them, but knew they used Diffractive optics. The lenses themselves looked like a fresnel lens laminated between two lenses... does any one have any info on this technology, or how the lenses themselves worked? They were quite interesting.
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