G - Physics – 02 – C
Patent
G - Physics
02
C
G02C 7/06 (2006.01) G02C 7/02 (2006.01) G02C 7/04 (2006.01)
Patent
CA 2263635
A multifocal ocular lens having a vision correction area which consists of a central, an intermediate, and an outer vision correction region having respective different values of an optical power, and which has an optical axis with which centers of the central and outer vision correction regions are aligned, the central and outer vision correction regions having respectively determined first and second mutually different values of the optical power, wherein the optical power of the intermediate region is represented by a combination of a first and a second quadratic curve connected to each other at a point of inflection which corresponds to a radial position of a boundary between the inner and outer sections, and which corresponds to a desired third value of the optical power between the first and second values, or the optical power of the intermediate region is represented by one polynomial equation whose degree is not smaller than 2 and continuously changes from the first value to the second value with an increase in a radial distance from the optical axis.
Gotou Yuuzi
Miyamura Kazuya
Ohyama Hiroyuki
Sawano Tadashi
Borden Ladner Gervais Llp
Menicon Co. Ltd.
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