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For eyeglasses, special lenses which are a sandwich of stiff yet flexible clear plastic. Between the discs is a thin gap filled with clear fluid. Injecting fluid into the gap causes the lenses to bulge slightly, making them more convex. Conversely, withdrawing fluid makes them more concave. An IR rangefinder
(like in cameras) in the temple senses the distance to objects, and controls a micropump to transfer the right amount of fluid from a reservoir. Thus, the correction can be optimized for objects at a particular distance.
Glance Direction Specs
http://www.halfbake...Specs#963574831-2-1
How to "measure the angle". [egnor, May 10 2000, last modified Oct 04 2004]
TED: Josh Silver: adjustable liquid-filled lenses (2009)
http://www.ted.com/...led_eyeglasses.html
Without the autofocus / high-tech stuff - in fact, Silver's design comes out of trying to get vision to people without an optometrics infrastructure. [jutta, Jun 15 2010]
Superfocus
http://superfocus.com/home2/
Adjustable refractive power eyeglasses [whlanteigne, Apr 11 2013]
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An interesting idea, but I think it'd give one headaches pretty quickly. Your eyes are always changing focus, a little at a time. If the glasses tried to match, they'd always be a bit out of step, and if they had a built in lag, they'd still be incorrect for what you wanted. At least that's what it seems like to me... |
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Worse still, you get to enjoy being totally out of focus when you are driving and the range finder is detecting and focusing for the windshield only a foot in front of your face. |
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Can't see the point. Your eyes already do that...hopefuly (-). |
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No help for us astygmatics still... |
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Baked, bigsleep? Naw, rmutt beat them by years. There ought to be an HB award for ideas that get shamelessly stolen by college professors. A golden goose egg, maybe. |
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Now baked as a consumer product: Superfocus
glasses. See link. |
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