Variable focus lens and spectacles
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United States of America Patent
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May 14, 2013
Grant Date -
Oct 27, 2011
app pub date -
Apr 8, 2009
filing date -
Apr 10, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention provides a variable focus lens formed from a ring with a front surface and a rear surface, a flexible membrane is attached to a radially inner part of the front surface, and a front cover is attached to a radially outer part of the front surface, a rear cover is provided on the rear surface of the ring, preferably integral with the ring, so that a variable volume cavity is defined between the flexible membrane, the ring and the rear cover, second flexible membrane can be provided between the ring and the rear cover, where the invention also provides a method of filling a variable focus lens, and an adjustment mechanism for varying the focus of the lens.
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