Progressive-power spectacle lens design method
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United States of America Patent
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Sep 16, 2014
Grant Date -
Mar 15, 2012
app pub date -
Sep 12, 2011
filing date -
Sep 14, 2010
priority date (Note) -
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Abstract
A progressive-power spectacle lens design method, the progressive-power spectacle lens including a distance portion, a near portion, and a progressive portion provided between the distance portion and the near portion, the method comprising: decreasing a distance along a principal meridian from a fitting point to a progression start point and increasing a length of a progressive corridor defined by the progression start point and a progression end point when addition power is large, whereas increasing the distance along the principal meridian from the fitting point to the progression start point and decreasing the length of the progressive corridor when the addition power is small, wherein the distance from the fitting point to the progression end point is fixed irrespective of the addition power.
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