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US 12,491,066 B2Granted
Intraocular lens with extended depth of focus
AssigneesPhysiol, Consejo Superior de Investigaciones Scientificas (CSIC)
InventorsSusana Marcos Celestino, Carlos Dorronsoro Diaz, Suad Redzovic, Christophe Pagnoulle
Life of this patent
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Abstract
The invention relates to an intraocular lens with extended depth of focus including aspheric anterior and posterior optical surfaces.
Claims19
Intraocular lens comprising:
- an anterior optical surface, and
- a posterior optical surface,
- both extending radially outward relative to an optical axis (Z);
- characterized in that:
- a first surface among the anterior and posterior optical surfaces is defined by the equation:
- z
- s
-
- t
- (
- r
- )
- =
- r
- 2
- R
- s
-
- t
- (
- 1
- +
- 1
- -
- (
- 1
- +
- κ
- s
-
- t
- (
- R
- s
-
- t
- )
- )
-
- r
- 2
- R
- s
-
- t
- 2
- )
- +
- ∑
- i
- ≥
- 2
- α
- 2
-
- i
- s
-
- t
-
- r
- 2
-
- i
- where:
- zst(r) is a component, measured along the optical axis (Z), of a displacement vector from a vertex of the first surface,
- to any point of the latter at a radius r from the optical axis (Z);
- Rst is a radius of curvature of the first surface evaluated at said vertex;
- κst(Rst) is a conic constant of the first surface evaluated at said vertex and defined in function of said radius of curvature Rst of the first surface by the relation:
- κ
- s
-
- t
- (
- R
- s
-
- t
- )
- =
- {
- a
-
- R
- s
-
- t
- 2
- +
- b
-
- R
- s
-
- t
- +
- c
- if
-
- R
- s
-
- t
- <
- 0
- A
- [
- erf
-
- (
- BR
- s
-
- t
- +
- C
- )
- +
- D
- ]
- if
-
- R
- s
-
- t
- >
- 0
- where erf denotes a Gauss error function, and where a, b, c, A, B, C, D are constant real numbers such that:
- a∈[0.050;
- 0.075], b∈[−1;
- 0], c∈[−20;
- 0], A∈[−41;
- −39],
- B∈[0.07;
- 0.13], C∈[−2.6;
- −2.0] and D∈[0.75;
- 1.25];
- α21st is a coefficient of asphericity of order 2i of the first surface;
- a second surface among the anterior and posterior optical surfaces and different from said first surface is defined by the equation:
- z
- n
-
- d
- (
- r
- )
- =
- r
- 2
- R
- n
-
- d
- (
- 1
- +
- 1
- -
- (
- 1
- +
- κ
- n
-
- d
- (
- R
- n
-
- d
- )
- )
-
- r
- 2
- R
- n
-
- d
- 2
- )
- +
- ∑
- i
- ≥
- 2
- α
- 2
-
- i
- n
-
- d
-
- r
- 2
-
- i
- where:
- znd(r) is a component, measured along the optical axis (Z), of a displacement vector from a vertex of the second surface,
- to any point of the latter at a radius r from the optical axis (Z);
- Rnd<0 is a radius of curvature of the second surface evaluated at said vertex;
- κnd(Rnd) is a conic constant of the second surface evaluated at said vertex and defined in function of said radius of curvature Rnd of the second surface by the relation:
- κnd(Rnd)=fRnd2+gRnd+h
- where f, g, h are constant real numbers such that:
- f∈[0.08;
- 0.12], g∈[1.0;
- 1.6] and h∈[0;
- 9];
- α2ind is a coefficient of asphericity of order 2i of the second surface;
- the anterior and posterior optical surfaces being such that the intraocular lens provides an extended depth of focus, wherein
- the coefficients of asphericity of order smaller than or equal to 10 of the first and second surfaces are non-zero,
- the coefficients of asphericity of the first and second surfaces are bounded in absolute value by 0.1, and
- the coefficients of asphericity of order strictly greater than 10 of the first and second surfaces are substantially equal to zero.
212 more elements
Dependencies are inferred from the claim text.