Autofocusing eyewear, especially for presbyopia correction
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United States of America Patent
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Jan 27, 2015
Grant Date -
Aug 2, 2012
app pub date -
Jan 26, 2012
filing date -
Jan 28, 2011
priority date (Note) -
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Abstract
A pair of eyewear has transparent waveguides in each eyewear lens. An illumination subsystem directs a beam of light through the waveguides onto a wearer's eyes. A First Purkinje point imaging subsystem for each lens uses light reflected from the eyes through the waveguides. A controller calculates from the positions of the First Purkinje points the wearer's gaze parallax angle and/or the distance to an object of interest on which the gaze of the wearer's eyes converges. The output of the controller may drive variable-focus eyeglass lenses to enable a presbyopic wearer to focus on the object. Modified Alvarez variable-focus lenses are described.
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