Progressive spectacle lens
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United States of America Patent
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Nov 15, 2005
Issued Date -
N/A
app pub date -
Oct 24, 2002
filing date -
Apr 25, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A spectacle lens is provided with a region (distance portion) designed for viewing at greater distances and, in particular, 'to infinity', a region (near portion) designed for viewing at short distances and, in particular, 'reading distances', and a progression zone disposed between the distance portion and the near portion, in which the power of the spectacle lens increases from the value in the distance reference point located in the distance portion to the value at the near reference point located in the near portion along a line (principal meridian) curving towards the nose. The invention is marked by specific conditions for the astigmatic deviation and/or the mean 'as worn' power being observed.
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Cited Art Landscape
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