Intraocular lens having partly overlapping additional optical active sectors on opposite sides
An intraocular lens includes an optic having first and second sides. The optic has a first main lens surface at the first side, a second main lens surface at the second side, the first main lens surface providing a first main lens surface optical power, the second main lens surface providing a second main lens surface optical power, the first and second main lens surfaces providing a main lens having a main lens optical power and main optical axis defining radial, tangential and axial directions. The optic has: a first additional optical active part at the first side, providing a positive relative optical power with respect to the first main lens surface optical power; and a second additional optical active part at the second side, partly overlapping the first additional optical active part, providing a relative optical power and/or optical aberration with respect to the second main lens surface.
1. An intraocular lens ( 1 ) comprising an optic ( 3 ), the optic having first and second sides ( 3 . 1 , 3 . 2 ) and comprising:
a first main lens surface ( 4 . 1 ) at the first side ( 3 . 1 ) and a second main lens surface ( 4 . 2 ) at the second side ( 3 . 2 ), the first main lens surface providing a first main lens surface optical power and the second main lens surface providing a second main lens surface optical power,
the first and second main lens surfaces providing a main lens ( 4 ) having a main lens optical power to provide distance vision, and a main optical axis (R) defining a radial direction perpendicular to the main optical axis, a tangential direction around the main optical axis and an axial direction along the main optical axis;
a first additional optical active part ( 6 ) at the first side ( 3 . 1 ),
the first additional optical active part providing a positive relative optical power with respect to the first main lens surface optical power,
the first additional optical active part ( 6 ) being positioned at a distance from the optical axis (R) and in tangential directions being delimited by boundaries extending in radial directions, and
the first additional optical active part ( 6 ) overlapping with the second main lens surface ( 4 . 2 ) to form a secondary lens having the positive relative optical power of the first additional optical active part ( 6 ) with respect to the main lens ( 4 ) to provide near or reading vision;
a central part ( 8 ) at the first side ( 3 . 1 ),
the central part being arranged such that the main optical axis (R) passes through the central part, and fitting within a circumscribing circle around the optical axis,
the central part ( 8 ) being adjacent to the first additional optical active part ( 6 ), and
the central part having a relative optical power between −2 and 2 diopter with respect to the first main lens surface optical power; and
a second additional optical active part ( 15 ) at the second side ( 3 . 2 ),
the second additional optical active part being arranged such that the main optical axis (R) passes through the second additional optical active part, and fitting within a circumscribing circle around the main optical axis (R), and
the second additional optical active part providing a relative optical power and/or an optical aberration with respect to the second main lens surface,
wherein the distance between the main optical axis (R) and the first additional optical active part ( 6 ) is smaller than the radius of the circle circumscribing the second additional optical active part ( 15 ), the diameter of the circle circumscribing the central part ( 8 ) being smaller than the diameter of the circle circumscribing the second additional optical active part ( 15 ), such that the second optical active part at least partly overlaps with the first additional optical active part ( 6 ) and partly overlaps with the first main lens surface ( 4 . 1 ).
2. The intraocular lens according to claim 1 , wherein the second additional optical active part ( 15 ) provides a positive relative optical power with respect to the second main lens surface optical power.
3. The intraocular lens according to claim 2 , wherein the second additional optical active part ( 15 ) provides a positive relative spherical optical power with respect to the second main lens surface optical power.
4. The intraocular lens according to claim 1 , wherein the second additional optical active part ( 15 ) provides for an additional depth of focus.
5. The intraocular lens according to claim 4 , wherein the second additional optical active part ( 15 ) provides for an additional positive or negative spherical aberration with respect to an optical aberration of the second main lens surface.
6. The intraocular lens according to claim 1 , wherein the second additional optical active part ( 15 ) fits within a circumscribing circle having a diameter selected from the group consisting of smaller than or equal to 3 millimeter, smaller than or equal to 2 millimeter, and smaller than or equal to 1.5 millimeter.
7. The intraocular lens according to claim 1 , wherein the second additional optical active part ( 15 ) is circular.
8. The intraocular lens according to claim 2 , wherein the second additional optical active part ( 15 ) comprises a second additional optical power surface having a curvature stronger than a curvature of the second main lens surface ( 4 . 2 ).
9. The intraocular lens according to claim 8 , wherein the second additional optical power surface is raised with respect to the second main lens surface ( 4 . 2 ).
10. The intraocular lens according to claim 1 , wherein the distance between the main optical axis (R) and the first additional optical active part ( 6 ) is selected from the group consisting of smaller than 2 millimeter, smaller than 1.5 millimeter, smaller than 1 millimeter, and smaller than 0.5 millimeter.
11. The intraocular lens according to claim 1 , wherein the central part ( 8 ) fits within a circumscribing circle, the circle having a diameter selected from the group consisting of smaller than or equal to 3 millimeter, smaller than or equal to 2 millimeter, smaller than or equal to 1.5 millimeter, smaller than or equal to 1 millimeter, and smaller than or equal to 0.5 millimeter.
12. The intraocular lens according to claim 1 , wherein the central part ( 8 ) is circular.
13. The intraocular lens according to claim 1 , wherein the first additional optical active part ( 6 ) comprises a first additional optical power surface having a curvature stronger than a curvature of the first main lens surface ( 4 . 1 ).
14. The intraocular lens according to claim 13 , wherein the first additional optical power surface is recessed with respect to the first main lens surface ( 4 . 1 ).
15. The intraocular lens according to claim 1 , wherein the positive relative optical power of the first additional optical active part ( 6 ) with respect to the first main lens surface optical power is selected from the group consisting of between 0.5 and 5 diopter, between 0.5 and 4 diopter, and between 0.5 and 3 diopter.
16. The intraocular lens according to claim 2 , wherein the positive relative optical power of the second additional optical active part ( 15 ) with respect to the second main lens surface optical power is selected from the group consisting of between 0.25 and 2 diopter, and between 0.25 and 1 diopter.