Ophthalmic lens having an extended depth of focus
AssigneeAlcon Inc.
InventorsXIN HONG, ZORAN MILANOVIC, XIN WEI
Life of this patent
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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.
Claims20
An ophthalmic lens, comprising:
- an optic comprising a first surface, a second surface, and an optical axis, the first surface comprising:
- a first zone extending from the optical axis to a first radial boundary, the first zone comprising an inner region having a first curvature and an outer region having the first curvature;
- a second zone extending from the first radial boundary to an edge of the optic;
- and
- a phase shift feature comprising a first phase shift step extending from the first surface, a second phase shift step extending from the first surface, and an elevated lens segment extending between the first phase shift step and the second phase shift step.
An ophthalmic lens, comprising:
- an optic comprising a first surface, a second surface, and an optical axis;
- a phase shift feature separating an inner region and an outer region of the first surface, the phase shift feature comprising:
- a first phase shift step extending outwardly from the outer region of the first surface, the first phase shift step having a first step height;
- a second phase shift step extending inwardly toward the inner region of the first surface, the second phase shift step having a second step height;
- and
- a ridge surface extending between the first phase shift step and the second phase shift step;
- wherein the second step height is greater than the first step height such that the inner region is recessed relative to the outer region.
An ophthalmic lens having an optical axis, the ophthalmic lens comprising:
- a first zone extending from the optical axis to a first radial boundary, the first zone comprising an inner region and an outer region;
- and
- a second zone extending from the first radial boundary to an edge of the optic;
- wherein a surface profile of the first zone is defined as follows:
- Zfirst zone=Zbase+Z2ps
- 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
- a2, a4, and a6 are, respectively, second, fourth, and sixth order coefficients;
- and
- wherein:
- Z
- 2
-
- p
-
- s
- =
- {
- 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
- )
- /
- (
- r
- 4
- -
- r
- 3
- )
- *
- Δ
- 2
- r
- 3
- ≤
- r
- <
- r
- 4
- Δ
- 1
- +
- Δ
- 2
- r
- 4
- ≤
- r
- <
- r
- 5
- ;
- r0 is the optical axis;
- the inner region extends from the optical axis to r1
- the phase shift feature extends from r1 to r4;
- an outer region of the first zone extends from r4 to r5;
- Δ1 is a step height of the phase shift feature relative to the inner region;
- and
- Δ2 is a step height of the phase shift feature relative to the outer region.
Dependencies are inferred from the claim text.