Extended depth of focus intraocular lenses and associated methods
A method improves depth of focus in a first eye only by adding a higher order aberration (HOA) to the first eye by adding a monofocal optical device to the first eye. The method may also correct a spherical aberration in a second eye by inserting a monofocal aspheric IOL. The HOA added to the first eye may be selected from the group consisting of spherical, trefoil and coma. Additionally, the monofocal optical device inserted into the first eye may comprise a monofocal aspheric IOL that adds spherical aberration to the first eye. The optical device inserted into the first eye may comprise a 20 D monofocal aspheric IOL that adds 0.4 μm of spherical aberration to the first eye at 6 mm entrance pupil and adds 0.1 μm of spherical aberration to the first eye at 4 mm entrance pupil.
1. A method comprising improving depth of focus in a first eye only by
adding a higher order aberration (HOA) to the first eye by adding a monofocal optical device to the first eye, wherein the HOA is a longitudinal spherical aberration (LSA) and the LSA is less than or equal to 0 mm for all normalized radial distances.
2. The method of claim 1 , wherein the method further comprises a step of correcting a spherical aberration in a second eye by inserting a monofocal aspheric IOL.
3. The method as claimed in claim 2 , further comprising correcting a chromatic aberration in the second eye with the monofocal aspheric IOL.
4. The method as claimed in claim 1 , wherein the HOA added to the first eye is selected from the group consisting of spherical, trefoil and coma.
5. The method as claimed in claim 1 , wherein the monofocal optical device inserted into the first eye comprises a monofocal aspheric IOL that adds spherical aberration to the first eye.
6. The method as claimed in claim 5 , wherein the optical device inserted into the first eye comprises a 20 D monofocal aspheric IOL that adds 0.4 μm of spherical aberration to the first eye at 6 mm entrance pupil and adds 0.1 μm of spherical aberration to the first eye at 4 mm entrance pupil.
7. The method as claimed in claim 1 , wherein
the monofocal optical device inserted into the first eye defines an optical center, an outer edge, a first region that extends from the optical center to a radius between the outer edge and the optical center, and a second region located radially outward of the first region; and
the second region is configured to reduce a longitudinal HOA that will occur in low light conditions within an optical system defined by the monofocal optical device and the first eye.
8. The method as claimed in claim 7 , wherein
the monofocal optical device inserted into the first eye comprises a monofocal aspheric IOL;
the HOA added to the first eye comprises a spherical aberration; and
the longitudinal HOA comprises a longitudinal spherical aberration.
9. The method as claimed in claim 8 , wherein the monofocal optical device inserted into the first eye is configured to create, within the optical system, a higher order aberration to normalized radial distance ratio (HOA-NRD ratio) profile that increases in slope as NRD increases within at least a portion of the first region and does not increase in slope as NRD increases within at least a portion of the second region.
10. The method as claimed in claim 9 , wherein the HOA-NRD ratio profile increases in slope as NRD increases within the entire first region.
11. The method as claimed in claim 9 , wherein the HOA-NRD ratio profile decreases in slope as NRD increases within at least a substantial majority of the second region.
12. The method as claimed in claim 9 , wherein the first region and the second region are separated by an HOA-NRD profile inflection point.
13. The method as claimed in claim 12 , wherein the inflection point is between an NRD of between 0.4 and 0.8.