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http://www.gizmodo.com/gadgets/gadgets/liquidcrystal-switchable-focus-eyeglass-lenses-167757.php" [Broken] would be so cool!!!
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It would also be great if it made Fresnel prisms obsolete. It would be great to be able to say: "Need a different prism? No problem, I'll just program it into your glasses. Just give me a few seconds.......there you go. Now walk around for a while and make sure you it works like it before you leave."Wicked! If they can also deliver a tapered cylinder for astigmatism and correct for field-of-vision defects, we've got some killer technology.