Progressive lens series
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United States of America Patent
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-
Feb 8, 1994
Grant Date -
N/A
app pub date -
Nov 20, 1992
filing date -
Nov 20, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A progressive power lens series in which the surface of each lens body has first and second vision portions which differ in power in accordance with a power curve which lies entirely in the y-z plane of a Cartesian coordinate system and which is the umbilical portion of the principal meridian of the progressive surface with the curvature of the surface in at least one of said vision portions spreading away from the power curve in accordance with a spreading function defined by the intersection of nested non-bipolar conic sections or nested hyperbolic cosines with the x-y plane of the coordinate system.
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