# US 12,109,107 B2 · Multifocal ophthalmic lens having chromatic aberration correction

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- Number: US 12,109,107 B2
- Document ID: US12109107B2
- Status: Granted
- Kind: B2
- Application number: 17/229,252
- Filed: 2021-04-13
- Published: 2021-07-29
- Granted: 2024-10-08
- Earliest claimed: 2017-04-27
- Assignees: Alcon Inc.
- Applicants: Alcon Inc.
- Inventors: Xin Hong; Xin Wei
- Web page: https://patentgrep.com/patent/US12109107B2

## CPC

- A61F 2/1613: {having special lens configurations, e.g. multipart lenses; having particular optical properties, e.g. pseudo-accommodative lenses, lenses having aberration corrections, diffractive lenses, lenses for variably absorbing electromagnetic radiation, lenses having variable focus}
- A61F 2/1618: {Multifocal lenses}
- A61F 2/1637: {Correcting aberrations caused by inhomogeneities; correcting intrinsic aberrations, e.g. of the cornea, of the surface of the natural lens, aspheric, cylindrical, toric lenses}
- A61F 2/1654: {Diffractive lenses}
- G02C 7/041: {bifocal; multifocal}
- A61F 2/1659: {having variable absorption coefficient for electromagnetic radiation, e.g. photochromic lenses}
- A61F 2002/1681: {having supporting structure for lens, e.g. haptics}
- G02C 7/06: bifocal; multifocal {; progressive (G02C7/041 takes precedence)}
- G02C 2202/20: Diffractive and Fresnel lenses or lens portions
- G02C 2202/22: Correction of higher order and chromatic aberrations, wave front measurement and calculation
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)
- G02C: SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES (trial frames for testing the eyes A61B3/04; goggles or eyeshields not having the same features as spectacles A61F9/00)

## Abstract

An ophthalmic lens includes an optic comprising an anterior surface, a posterior surface, and an optical axis. At least one of the anterior surface and the posterior surface has a surface profile including a base curvature, a refractive region having the base curvature, and a diffractive region comprising a diffractive profile including a plurality of diffractive steps. At least a portion of the diffractive profile constitutes a combination of a base diffractive profile defining multiple foci for the ophthalmic lens and an achromatizing structure that reduces longitudinal chromatic aberrations.

## Claims

### Claim 1

An ophthalmic lens, comprising:
an optic comprising a surface profile including a base curvature and a diffractive profile comprising a plurality of diffractive steps, at least a portion of the diffractive profile being a combination of:
a base diffractive profile defining multiple foci for the ophthalmic lens; and
an achromatizing structure that reduces longitudinal chromatic aberrations; and
the surface profile is defined as follows:
Sag
achromatized_multifocal
=
Sag
⁡
(
r
)
+
g
⁡
(
r
)
;
g
⁡
(
R
)
=
0
0
≤
r
≤
r
1
′
;
g
⁡
(
r
)
=
h
×
(
r
2
T
g
-
⌊
r
2
T
g
⌋
)
r
1
′
<
r
≤
r
2
′
;
g
⁡
(
r
)
=
0
r
2
′
<
r
≤
r
3
;
wherein:
Sag(r) defines the surface profile of the ophthalmic lens excluding the achromatizing structure;
g(r) defines the achromatizing structure;
r3, r1′ and r2′ denote junction points on the surface profile;
Tg denotes a period in r2 space of the achromatizing structure;
└ ┘ denotes a floor function, wherein └x┘=max{m∈z|m≤x} is a set of integers; and
h denotes a step height.

### Claim 2 (depends on 1)

The ophthalmic lens of claim 1, wherein the base diffractive profile comprises an apodized diffractive profile.

### Claim 3 (depends on 1)

The ophthalmic lens of claim 1, wherein n defines an outer edge of the optic.

### Claim 4 (depends on 1)

The ophthalmic lens of claim 1, wherein:
Z
b
⁢
a
⁢
s
⁢
e
(
r
)
=
cr
2
1
+
1
-
(
1
+
k
)
⁢
c
2
⁢
r
2
+
a
2
⁢
r
2
+
a
4
⁢
r
4
+
a
6
⁢
r
6
+
…
+
a
n
⁢
r
n
;
Zbase(r) denotes the base curvature of the optic;
r is a radial distance from the optical axis;
c is a base curvature of the surface;
k is a conic constant; and
a2, a4, a6, and an are, respectively, second, fourth, sixth, and nth order coefficients, where n is an even number.

### Claim 5 (depends on 4)

The ophthalmic lens of claim 4, wherein n=20.

### Claim 6 (depends on 1)

The ophthalmic lens of claim 1, wherein:
h=Nhλ/(nIOL−nocularmedia);
Nh is an integral;
λ denotes a design wavelength;
nIOL denotes a refractive index of ophthalmic lens; and
nocularmedia denotes a refractive index of an ocular media of a patient.