Aspheric lenses and lens family
View Patent ↗In an embodiment, an aspheric IOL for use in a pseudophakic ocular system has no inherent spherical aberration. In an embodiment, an aspheric IOL for use in a pseudophakic ocular system has a controlled amount of inherent negative spherical aberration such that the IOL induces no spherical aberration in a converging wavefront from a cornea passing through the lens. An embodiment of the invention is directed to a family of aspheric IOLs made up of any two or more member aspheric IOLs each having different spherical aberration values and different lens shape factors. A lens constant, such as the well known A-constant, is kept constant throughout the family of lenses. An embodiment of the invention is directed to a multi-component accommodating intraocular lens (A-IOL). In a particular embodiment, the A-IOL introduces substantially no residual spherical aberration to a wavefront incident upon and passing through the A-IOL.
1. A family of aspheric IOLs, comprising:
a plurality of individual aspheric IOLs each having a same lens power value and a different value of inherent spherical aberration (SA), wherein each of the lenses is characterized by a lens constant that is the same for the plurality of lenses, further wherein each lens has a lens shape factor that is different for the plurality of lenses.
2. The family of IOLs of claim 1 , wherein the plurality of IOLs consists of any two or more individual IOLs.
3. The family of IOLs of claim 1 , wherein each of the plurality of IOLs is a childlens whose lens constant is the same as the lens constant of a spherical parent-lens that is not one of the family of IOLs.
4. The family of IOLs of claim 1 , wherein the value of inherent spherical aberration is in the range of −2.0μ≦SA≦1.0μ over a 6mm pupil aperture.
5. The family of IOLs of claim 1 , wherein the family of IOLs comprises at least one IOL in a first group having a value of inherent spherical aberration (SA) in the range of −2.0μ≦SA<0μ over a 6mm pupil aperture, at least one IOL in a second group having a value of inherent spherical aberration substantially equal to zero, and at least one IOL in a third group having a value of inherent spherical aberration (SA) in the range of 0<SA≦1μ over a 6mm pupil aperture.
6. The family of IOLs of claim 5 , wherein at least one lens in the first group and at least one lens in the second group and at least one lens in the third group have equal values of lens power.
7. The family of IOLs of claim 1 , wherein each of the lenses has a different lens power.
8. The family of IOLs of claim 1 , further wherein each of the lenses has a paraxial power (P) in the range +15D≦P≦+40D.
9. The family of IOLs of claim 5 , further comprising an optical system having an optical axis, the system including a focusing optical element having a focusing power between 37 diopters to 49 diopters and including a single one of the plurality of the first group of IOLs, said focusing optical element disposed on an object side of the one lens, wherein the lens induces no spherical aberration in a converging wavefront propagating from the focusing optical element through the lens.
10. The family of IOLs of claim 5 , further comprising an optical system having an optical axis, the system including a focusing optical element and a single one of the plurality of the first group of IOLs, said focusing optical element disposed on an object side of the one lens, wherein the lens induces between about −0.13μ to −0.07μ of spherical aberration to a converging wavefront propagating from the focusing optical element through the lens, further wherein the spherical aberration amount is analogous to an amount of spherical aberration induced by a healthy natural crystalline lens in a relaxed state.
11. The family of IOLs of claim 10 , wherein the lens induces about −0.1μ of spherical aberration to a converging wavefront propagating from the focusing optical element through the lens.
12. The family of IOLs of claim 1 , comprising phakic IOLs, pseudophakic IOLs or a combination of phakic IOLs and pseudophakic IOLs.
13. The family of IOLs of claim 1 , wherein each of the plurality of individual IOLs has a posterior surface and an anterior surface characterized by a respective conic constant, k p , k a , further wherein the ratio k a :k p is constant for all radii.
14. The family of IOLs of claim 1 , wherein each of the plurality of individual IOLs has a lens body made of silicone having an index or refraction (n) of between 1.40 ≦n ≦1.60.
15. The family of IOLs of claim 14 , wherein each of the plurality of individual IOLs has a lens body made of silicone having an index or refraction (n) of about 1.43.
16. The family of IOLs of claim 1 , wherein each of the plurality of individual IOLs has a lens body made of a hydrophilic acrylic having an index or refraction (n) of about 1.46.
17. The family of IOLs of claim 1 , where each lens is labeled as having a same power as other lenses in the family.
18. The family of IOLs of claim 1 , wherein each of the lenses has a paraxial power (P) in the range −10D ≦P ≦+40D.