EP0942312A2
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EP
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Multifocal ocular lens having intermediate region with continuously varying optical power
Assignee: Menicon Co Ltd
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Filing: 1999-03-11
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Granted: —
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Expires: 2019-03-11
Abstract
Abstract A multifocal ocular lens having a vision correction area (12, 112) which consists of a central, an intermediate, and an outer vision correction region (14, 16, 18; 114, 116, 118) 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 (16) 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 (116) is represented by one polynomial equation whose degree "exp" 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.
Inventors
- 👤 Tadashi C/O Menicon Co. Ltd. Sawano
- 👤 Hiroyuki C/O Menicon Co. Ltd. Ohyama
- 👤 Kazuya C/O Menicon Co. Ltd. Miyamura
- 👤 Yuuzi c/o Menicon Co. Ltd. Gotou
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 02:21
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/041; G02C7/044; A; A61; A61F; A61F2/00; A61F2/02; A61F2/14; A61F2/16; A61F2/1613; A61F2/1616; A61F2/1618; G02C7/042; G02C7/043; G02C2202/00; G02C2202/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
290 words
A multifocal ocular lens (10, 30, 32,
40) having a vision correction area (12) consisting of a
plurality of vision correction regions having respective
different values of an optical power, said plurality of
vision correction regions including a central vision
correction region (14), an outer vision correction region
(16), and an intermediate region (18) located between said
central and outer vision correction regions, said vision
correction area (12) having an optical axis with which
centers of said central and outer vision correction regions
are aligned, said intermediate region consisting of a
radially inner transition section (20) adjacent to said
central vision correction region and a radially outer
transition section (22) adjacent to said outer vision
correction region, said central and outer vision correction regions
having respectively determined first and second mutually
different values (Pa, Pc) of said optical power, said
optical power of said intermediate region changing from said
first value to said second value, such that a rate of change
of said optical power of said radially inner transition
section (20) increases with an increase in a radial distance
from said optical axis of said vision correction area (12)
of said lens, along a first quadratic curve, while a rate of
change of said optical power of said radially outer
transition section (22) increases with an increase in a
radial distance from a radially inner periphery of said
outer vision correction region, along a second quadratic
curve, said first and second quadratic curves being
connected to each other at a point of inflection which
corresponds to a radial position of a boundary between said
radially inner and outer transition sections, and which
corresponds to a desired third value (Pb) of said optical
power between said first and second values.
Claim 2
Dependent Claim
265 words
A multifocal ocular lens according to
claim 1, wherein a value y1 of said optical power of said
radially inner transition section (20) at a radial point
which is distant from said optical axis of said vision
correction area (12) of said lens by a radial distance x1 is
represented by the following equation (1), while a value y2
of said optical power of said radially outer transition
section (22) at a radial point which is distant from said
optical axis of said vision correction area (12) by a radial
distance x2 is represented by the following equation (2), y1 = Pa - (Pa-Pb) × (Wa-x1) 2 /(Wa-Wb) 2 y2 = Pc - (Pc-Pb) × (Wc-x2) 2 /(Wc-Wb) 2 wherein, Pa: said first value of said optical power of said central
vision correction region (14), Pc: said second value of said optical power of said outer
vision correction region (16), Pb: said third value of said optical power at said radial
position of said boundary between said radially inner
and outer transition sections (20, 22), Wa: a radial distance from said optical axis of said vision
correction area (12) to a boundary between said central
vision correction region (14) and said radially inner
transition section (20), Wb: a radial distance from said optical axis of said vision
correction area (12) to said boundary between said
radially inner and outer transition sections (20, 22), and Wc: a radial distance from said optical axis of said vision
correction area (12) to a boundary of said radially
outer transition section (22) and said outer vision
correction region (16).
Claim 3
Dependent Claim
50 words
A multifocal ocular lens according to
claim 2, wherein said radial distance Wb from said optical
axis of said vision correction area (12) to said boundary of
said radially inner and outer transition sections (20, 22)
is determined according to the following equation: Wb = ((Pa-Pb)Wc - (Pc - Pb)Wa)/(Pa-Pc)
Claim 4
Dependent Claim
150 words
A multifocal ocular lens according to
claim 2 or 3, wherein said central vision correction region
(14) constitutes a part of a central optical zone (24) for
correction of a near vision, while said outer vision
correction region (16) constitutes a part of a peripheral
optical zone (26) for correction of a distant vision, and
values Pa, Pb, Pc, Wa, Wb and Wc in said equations (1) and
(2) are determined as follows: Pa = P + ADD P + (1/6)ADD ≦ Pb ≦ P + (2/3)ADD Pc = P Wa = (1/2)SD (1/2)SD + (1/8)IM ≦ Wb ≦ (1/2)SD + (1/2)IM Wc = (1/2)SD + IM 0.1mm ≦ IM ≦ 3.5mm 0 ≦ SD ≦ 8.0mm wherein, ADD: a difference between Pa and Pc, IM: a radial dimension of said intermediate region, SD: a diameter of said central optical zone, and OZ: a diameter of said peripheral optical zone.
Claim 5
Dependent Claim
150 words
A multifocal ocular lens according to
claim 2 or 3, wherein said central vision correction region
(14) constitutes a part of a central optical zone (24) for
correction of a distant vision, while said outer vision
correction region (16) constitutes a part of a peripheral
optical zone (26) for correction of a near vision, and
values Pa, Pb, Pc, Wa, Wb and Wc in said equations (1) and
(2) are determined as follows: Pa = P P + (1/6)ADD ≦ Pb ≦ P + (2/3)ADD Pc = P + ADD Wa = (1/2)SD (1/2)SD + (1/2)IM ≦ Wb ≦ (1/2)SD + (7/8)IM Wc = (1/2)SD + IM 0.1mm ≦ IM ≦ 3.5mm 0 ≦ SD ≦ 8.0mm wherein, ADD: a difference between Pa and Pc, IM: a radial dimension of said intermediate region, SD: a diameter of said central optical zone, and OZ: a diameter of said peripheral optical zone.
Claim 6
Dependent Claim
47 words
A multifocal ocular lens according to
any one of claims 1-5, wherein said optical axis of said
vision correction area (12) of said lens is offset from a
geometric center axis of said lens in a lateral direction by
a distance of not larger than 2.0 mm.
Claim 7
Dependent Claim
92 words
A multifocal ocular lens according to
any one of claims 1-4 and 6, wherein said central vision
correction region (14) constitutes a part of a central
optical zone (24) for correction of a near vision, while
said outer vision correction region (16) constitutes a part
of a peripheral optical zone (26) for correction of a
distant vision, said optical axis of said vision correction
area (12) of said lens being offset from a geometric center
axis of said lens in a downward direction by a distance of
not larger than 7.0 mm.
Claim 8
Dependent Claim
92 words
A multifocal ocular lens according to
any one of claims 1-3 and 5-6, wherein said central vision
correction region (14) constitutes a part of a central
optical zone (24) for correction of a distant vision, while
said outer vision correction region (16) constitutes a part
of a peripheral optical zone (26) for correction of a near
vision, said optical axis of said vision correction area
(12) of said lens being offset from a geometric center axis
of said lens in an upward direction by a distance of not
larger than 7.0 mm.
Claim 9
Dependent Claim
33 words
A multifocal ocular lens according to
any one of claims 1-8, wherein at least one of opposite
surfaces of said lens has part-spherical portions
corresponding to said central and outer vision correction
regions.
Claim 10
Dependent Claim
31 words
A multifocal ocular lens according to
any one of claims 1-9, wherein either one of opposite
surfaces of said lens has a toric portion corresponding to
said vision correction area (12).
Claim 11
Dependent Claim
160 words
A multifocal ocular lens (110, 130, 132,
140) having a vision correction area (112) which consists of
a plurality of vision correction regions having respective
different values of an optical power, said plurality of
vision correction regions including a central vision
correction region (114), an outer vision correction region
(116), and an intermediate region (118) located between said
central and outer vision correction regions, said vision
correction area (112) having an optical axis with which
centers of said central and outer vision correction regions
are aligned, said central and outer vision correction regions
having respectively determined first and second mutually
different values (Pa, Pb) of said optical power, said
optical power of said intermediate region being represented
by one polynomial equation whose degree "exp" is not smaller
than 2, and continuously changing from said first value to
said second value with an increase in a radial distance from
said optical axis of said vision correction area (112) of
said lens.
Claim 12
Dependent Claim
95 words
A multifocal ocular lens according to
claim 11, wherein said degree "exp" of said polynomial
equation which represents said optical power of said
intermediate region and a radial dimension "IM" (mm) of said
intermediate region are determined so as to satisfy the
following formulas (20) and (21), respectively, while a
diameter "SD" (mm) of a central optical zone which is
constituted by said central vision correction region (114)
is determined so as to satisfy the following formula (22): 2 ≦ exp ≦ 20 exp/20 ≦ IM ≦ 2.0 + exp/5 0.2 ≦ SD ≦ 3.0
Claim 13
Dependent Claim
27 words
A multifocal ocular lens according to
claim 13, wherein said degree "exp" is determined so as to
satisfy the following formula (23): 4 ≦ exp ≦ 8
Claim 14
Dependent Claim
44 words
A multifocal ocular lens according to
any one of claims 11-13, wherein said optical axis of said
vision correction area (112) is offset from a geometric
center axis of said lens in a lateral direction by a
distance of not larger than 2.0 mm.
Claim 15
Dependent Claim
85 words
A multifocal ocular lens according to
any one of claims 11-14, wherein said central vision
correction region (114) constitutes a part of a central
optical zone for correction of a near vision, while said
outer vision correction region (116) constitutes a part of a
peripheral optical zone for correction of a distant vision,
said optical axis of said vision correction area (112) being
offset from a geometric center axis of said lens in a
downward direction by a distance of not larger than 7.0 mm.
Claim 16
Dependent Claim
85 words
A multifocal ocular lens according to
any one of claims 11-14, wherein said central vision
correction region (114) constitutes a part of a central
optical zone for correction of a distant vision, while said
outer vision correction region (116) constitutes a part of a
peripheral optical zone for correction of a near vision,
said optical axis of said vision correction area (112) being
offset from a geometric center axis of said lens in an
upward direction by a distance of not larger than 7.0 mm.
Claim 17
Dependent Claim
33 words
A multifocal ocular lens according to
any one of claims 11-16, wherein at least one of opposite
surfaces of said lens has part-spherical portions
corresponding to said central and outer vision correction
regions.
Claim 18
Dependent Claim
31 words
A multifocal ocular lens according to
any one of claims 11-17, wherein either one of opposite
surfaces of said lens has a toric portion corresponding to
said vision correction area (112).
References Cited (Backward Citations)
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