Ophthalmic lens having an extended depth of focus

Patent metadata

Field	Value
Publication number	US-9968440-B2
Application number	US-201615055993-A
Country	US
Kind code	B2
Filing date	Feb 29, 2016
Priority date	Feb 29, 2016
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

In certain embodiments, an ophthalmic lens includes an optic having an anterior surface, a posterior surface, and an optical axis. At least one of the anterior surface and the posterior surface includes a first zone extending from the optical axis to a first radial boundary and a second zone extending from the first radial boundary to the edge of the optic. The first zone includes an inner region and an outer region separated by a phase shift feature, the phase shift comprising a ridge extending outwardly from the inner region and the outer region.

First claim

The invention claimed is:

1. An ophthalmic lens, comprising
an optic comprising an anterior surface, a posterior surface, and an optical axis, at least one of the anterior surface and the posterior surface comprising:
a first zone extending from the optical axis to a first radial boundary; and
a second zone extending from the first radial boundary to the edge of the optic;

wherein:
the first zone comprises an inner region having a first curvature and an outer region having the first curvature;
a phase shift feature separating the inner region and the outer region, the phase shift feature comprising a ridge of increased thickness relative to adjacent portions of the inner region and the outer region, the ridge comprising a ridge surface having the first curvature, a first phase shift step extending outwardly from the inner region to the ridge surface, and a second phase shift step extending inwardly from the ridge surface to the outer region.

2. The ophthalmic lens of claim 1 , wherein the inner region and the outer region have the same optical power.

3. The ophthalmic lens of claim 1 , wherein:
the first curvature comprises a first aspheric profile;
the second zone has a second curvature comprising a second aspheric profile, the second aspheric profile being different than the first aspheric profile.

4. The ophthalmic lens of claim 1 , wherein a surface profile of the first zone is defined as follows:
Z first zone =Z base +Z 2ps
wherein:

Z
base

=

cr
2

1
+

1
-

(

1
+
k

)

⁢

c
2

⁢

r
2

+

a
2

⁢

r
2

+

a
4

⁢

r
4

+

a
6

⁢

r
6

r is a radial distance from the optical axis;
c is a base curvature of the first zone;
k is a conic constant; and
a 2 , a 4 , and a 6 are, respectively, second, fourth, and sixth order coefficients; and

wherein:

Z

2
⁢
ps

=

{

0

r
0

≤
r
<

r
1

(

r
-

r
1

)

⁢

/

⁢

(

r
2

-

r
1

)

*

Δ
1

r
1

≤
r
<

r
2

Δ
1

r
2

≤
r
<

r
3

Δ
1

+

(

r
-

r
3

)

⁢

/

⁢

(

Assignees

• Novartis Ag

Inventors

• Hong Xin
• Milanovic Zoran
• Wei Xin

Classifications

• G02C7/06

  bifocal; multifocal {; progressive (G02C7/041 takes precedence)} · CPC title

• G02C7/044

  Annular configuration, e.g. pupil tuned · CPC title

• G02B27/0075

  with means for altering, e.g. increasing, the depth of field or depth of focus · CPC title

• A61F2/1618 Primary

  Multifocal lenses · CPC title

• A61F2/1616

  Pseudo-accommodative, e.g. multifocal or enabling monovision · CPC title