Optical device for restoring eyesight
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United States of America Patent
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Aug 8, 2017
Grant Date -
Apr 21, 2016
app pub date -
Sep 16, 2015
filing date -
Oct 20, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
Disclosed herein is an optical device for restoring eyesight, which includes a first tube configured such that a first convex lens having a first focal length is installed to an inner peripheral surface of a fore-end thereof, a second tube inserted into the first tube so as to move forward and backward within the first tube while a first concave lens having a second focal length and a second concave lens having a third focal length are installed to an inner peripheral surface of a fore-end thereof, a third tube configured such that a third concave lens having a fourth focal length and a fourth concave lens having a fifth focal length are installed to an inner peripheral surface of a fore-end thereof, a fixing unit for fixing the second tube to the third tube, and a fourth tube fixed to the fixing unit to cover the second tube.
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