Progressive spectacle lens with low magnifying differences
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United States of America Patent
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-
Feb 1, 2005
Grant Date -
Aug 28, 2003
app pub date -
Oct 25, 2002
filing date -
Apr 25, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A spectacle lens comprises a region (distance portion) designed for viewing at large distances and in particular 'to infinity'; a region (near portion) designed for viewing at short distances and in particular 'reading distances'; and a progressive zone disposed between the distance portion and the near portion, in which the power of the spectacle lens increases from a value at a distance reference point located in the distance portion to a value at the near reference point located in the near portion along a curve (principal line) veering towards the nose. The invention is distinguished by a combination of the following features: a change of magnification with a direction of sight is small; the magnification increases radially, starting from the distance reference point; the difference between the magnifications at the distance and near reference points is small.
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