Progressive power lens
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United States of America Patent
Stats
-
Oct 3, 1995
Grant Date -
N/A
app pub date -
Aug 25, 1992
filing date -
Dec 27, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In the present invention, the distance, the intermediate, and the reading portions are smoothly jointed together, and thereby the present invention provides a progressive power lens which is capable of enlarging an area, which provides an excellent field of view, by improving aberration of the lens body as well as reducing in weight and thickness. The curvature of one of two refracting interfaces of the distance portion or the reading portion varies along the principal gazing line from the vicinity of the center of the lens toward the peripheral portion thereof, the refracting interfaces oppositely facing to each other.
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Family
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Cited Art Landscape
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