Progressive power lens
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United States of America Patent
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Mar 11, 2008
Grant Date -
Dec 29, 2005
app pub date -
Jun 24, 2005
filing date -
Jun 25, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A progressive power lens having a positive vertex power in a distance portion is provided. At least a back surface of the progressive power lens is configured as a progressive surface. The progressive power lens satisfies a condition:<.times..times.< ##EQU00001## where Pf represents a vertex power in the distance portion along a vertical cross-section, ADD represents an addition power, and D1 represents a surface power of a front surface.
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