Progressive multifocal ophthalmic lens
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United States of America Patent
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-
Jan 30, 1996
Grant Date -
N/A
app pub date -
Nov 18, 1993
filing date -
Dec 11, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A progressive multifocal ophthalmic lens is provided having an aspherical surface comprising a distance vision portion, a near vision portion and an intermediate vision portion, in which the maximum mean sphere gradient value is situated in the intermediate vision portion of the principal meridian of progression of the lens, and the cylinder gradient over the whole aspherical surface of the lens is less than the product obtained by multiplying the power addition value at each point by a constant value coefficient.
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Family
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