Menicon Co., Ltd.

Hideaki Kondou

Hiroyuki Oyama

Kazuya Miyamura

Tadashi Sawano

Yuuzi Gotou

Hiroyuki Ohyama

A multifocal ocular lens having a vision correction area including at least one distant vision correction region having a first optical power value for distant vision correction and at least one near vision correction region having a second optical power value for near vision correction, wherein the vision correction area further includes a central intermediate-distance vision correction region which has a third optical power value for intermediate vision correction between the first and second optical power values and which is located in a central portion of the vision correction area such that the distant and near vision correction regions are located radially outwardly of the central intermediate-distance vision correction region.

Multifocal ocular lens having intermediate-distance vision correction region formed in central part of vision correction area

A multifocal ocular lens having a vision correction area which includes a central and outer vision correction region, an intermediate region located between the central and outer regions, and an intermediate-distance vision correction region located radially outwardly of and adjacent to the outer region, and which has an optical axis with which centers of these regions are aligned, the central and outer vision correction regions having respective different first and second optical power values, wherein the optical power of the intermediate region located between the central and outer regions is represented by a combination of two different quadratic curves connected to each other at a point of inflection which corresponds to a desired third optical power between the first and second values, and wherein the intermediate-distance vision correction region located radially outwardly of the outer region includes radially inner and outer varying-power zones, the optical power in the radially inner varying-power zone continuously varying from the second value of the outer vision correction region to a predetermined fourth value which is between the first and second values, while the optical power in the radially outer varying-power zone continuously varying from the fourth value to the second value of the outer region.

Multifocal ocular lens

A toric multifocal lens including a plurality of vision correction regions having centers on a common optical center axis, the plurality of vision correction regions providing respective different values of a spherical optical power, each of the plurality of vision correction regions having an optical power for correction of astigmatism, wherein the improvement comprises: at least one of a cylindrical optical power and a cylindrical axis orientation which determine the optical power for correction of astigmatism being different in at least two different vision correction regions of the plurality of vision correction regions, so that the at least two different vision correction regions have respective different values of the optical power for correction of astigmatism.

Growing community of inventors

Okazaki, Japan

Hideaki Kondou