Progressive-power lens and progressive-power lens design method
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United States of America Patent
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Jul 15, 2014
Grant Date -
Aug 30, 2012
app pub date -
Feb 23, 2012
filing date -
Feb 24, 2011
priority date (Note) -
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Abstract
A progressive-power lens includes an eyeball-side surface including a distance portion and a near portion having different values of dioptric power. An intermediate portion connects the distance portion and the near portion to each other. An object-side surface of the progressive-power lens includes a first region extending along a principal meridian and having a spherical shape having first curvature, a second region facing the distance portion and having a spherical shape having second curvature equal to the first curvature, and a third region located outside the first region and below the second region and having third curvature greater than the first curvature.
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