Ophthalmic lens with optical sectors
An ophthalmic lens comprising a main lens part, a recessed part, an optical center, and an optical axis through the optical center. The main lens part has at least one boundary with the recessed part and has an optical power of between about −20 to about +35 diopter. The recessed part is positioned at a distance of less than 2 mm from the optical center and includes a near part having a relative diopter of about +1.0 to about +5.0 with respect to the optical power of the main lens part. The boundary or boundaries of the recessed lens part with the main lens part form a blending part or blending parts, are shaped to refract light away from the optical axis, and have a curvature resulting in a loss of light, within a circle with a diameter of 4 mm around the optical center, of less than about 15%.
1. An intra-ocular lens comprising opposing first and second sides, and
a main lens part having a surface at the first side and an optical axis passing through an optical centre of the intra-ocular lens, the main lens part having an optical power;
a recessed part having a surface at the first side, which surface is recessed with respect to the surface of the main lens part, the surface of the recessed part having at least one boundary with the surface of the main lens part and the recessed part comprising a near vision part, the near vision part having an add power with respect to the optical power of the main lens part;
a central part having a surface at the first side, which surface is arranged such as to have boundaries with the surface of the main lens part and the surface of the recessed part, the central part having a relative optical power with respect to the optical power of the main lens part;
wherein the central part is circular with a diameter between about 0.5 and 3.0 mm; and
wherein the surface of the recessed part is shaped as a meridian zone having a boundary with the surface of the main lens part, the boundary comprising two semi meridians passing over the surface of the main lens part and through the optical centre.
2. The lens according to claim 1 , wherein the central part comprises the optical centre.
3. The lens according to claim 1 , wherein the relative optical power of the central part with respect to the optical power of the main lens part is between 0% and 100% of the relative optical power of the near vision part with respect to the optical power of the main lens part.
4. The lens according to claim 1 , wherein the relative optical power of the central part is between about −2.0 and +2.0 dioptre with respect to the optical power of the main lens part.
5. The lens according to claim 1 , wherein the central part is circular with a diameter between about 0.5 and 2.0 mm.
6. The lens according to claim 1 , wherein the surface of the recessed part is bounded by a line of latitude, which is concentric with and at a distance from the central part in the radial direction with respect to the optical axis.
7. The lens according to claim 1 , wherein the main lens part is configured for distance vision.
8. The lens according to claim 1 , wherein the near vision part is configured for reading vision.
9. The lens according to claim 1 , wherein the near vision part has a relative optical power of about +1.0 to about +5.0 dioptre with respect to the optical power of the main lens part.
10. The lens according to claim 1 , wherein the near vision part has a relative optical power of about +1.5 to about +4.0 dioptre with respect to the optical power of the main lens part.
11. The lens according to claim 1 , wherein the main lens part has an optical power of about −20 to about +35 dioptre.
12. The lens according to claim 1 , wherein the main lens part has an optical power of about −10 to about +30 dioptre.
13. An intra-ocular lens comprising
a main lens part having a curvature radius Rv;
a circular central part having a first optical property and having a diameter between about 0.5 and 2 mm; and
a meridian part comprising a recess which is bounded by the circular central part, by two meridians passing through a centre of the central part, and by a lower boundary which is concentric with respect to the circular part, the meridian part forming a recess in the lens, the recess having an outer limit lying on or within the curvature radius Rv, and the meridian part comprising a reading vision part.
14. An oculary supported multifocal intra-ocular lens provided with
a circular central lens portion having a diameter between about 0.5 and 2 mm;
a lower lens portion in a lower lens part of the multifocal lens neighbouring the central lens portion; and
a further lens portion having a curvature radius Rv,
wherein the lower lens portion comprises a recess comprising two sides which run from the central lens portion towards a rim of the multifocal lens, and an outer limit of the lower lens portion lies on or within an imaginary sphere having its origin and radius of curvature coinciding with the curvature radius Rv of the further lens portion.
15. The lens according to claim 1 , wherein the central part is circular with a diameter between about 0.6 and 3.0 mm.
16. The lens according to claim 1 , wherein the central part is circular with a diameter between about 0.8 and 3.0 mm.
17. The lens according to claim 1 , wherein the central part is circular with a diameter between about 0.8 and 2.0 mm.