Progressive-power lens and progressive-power lens design method
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United States of America Patent
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Apr 1, 2014
Grant Date -
Sep 13, 2012
app pub date -
Mar 7, 2012
filing date -
Mar 8, 2011
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Abstract
A progressive-power lens having an eyeball-side surface including a distance portion and a near portion having different values of dioptric power and an intermediate portion that connects the distance portion and the near portion to each other, and an object-side surface including a spherical first region having a first curvature and extending along a principal meridian, a spherical second region having a second curvature equal to the first curvature and facing the distance portion, and a third region located outside the first region and below the second region and having a third curvature smaller than the first curvature.
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