Progressive power ophthalmic lens
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United States of America Patent
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-
Aug 7, 1990
Grant Date -
N/A
app pub date -
Jan 11, 1989
filing date -
May 14, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A progressive power ophthalmic lens having at least one surface contributing to an increase in power from a distant portion via a progressive zone to a reading portion, radii of curvature of horizontal section curves of the at least one surface contributing to an increase in power and having horizontal planes as a function of the distance from the main meridian decrease in a front surface in the region of the main meridian in the distant portion and increase in the rear surface in the distant portion and decrease in the reading portion, and the course of change of the curvature .DELTA.rh-rh(x,y)-rh (0,y) reverses with increasing distance x from the main meridian.
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