Edge design for reducing unwanted photic effects in intraocular lenses
View Patent ↗An intraocular lens (IOL) has an optic, a peripheral rim, and a reduced thickness region connecting the optic to the peripheral rim. The peripheral rim has a continuously curving outer edge that it does not include any tangents parallel to the optical axis either along its length or at the intersection of the outer edge with the anterior or posterior surfaces of the IOL.
1. An intraocular lens (IOL) formed from a soft, foldable material, comprising:
an optic having an optical surface with a base curvature corresponding to an optical power of the optic, the optic having an edge thickness at an outer boundary of the optical surface;
a peripheral rim formed as a circle surrounding the optic, the peripheral rim having a maximum thickness, the peripheral rim defining a cross section having a continuously curving outer edge having a constant radius and that does not include any tangents parallel to an optical axis of the optic, the continuously curving outer edge extending between the anterior and posterior surfaces of the IOL and intersecting each surface at a respective corner; and
a reduced thickness region outside the optical surface of the optic between the peripheral rim and the optic, the reduced thickness region integrally formed with the peripheral rim and the optic and having a reduced thickness relative to the maximum thickness of the peripheral rim and the edge thickness of the optic.
2. The IOL of claim 1 , wherein the continuously curving outer edge comprises a first portion having a curvature configured to reflect off-axis light rays within the optic and a second portion having a curvature configured to reflect off-axis light rays posterior to the optic.
3. The IOL of claim 1 , wherein an anterior surface of the IOL is recessed to form the reduced thickness region.
4. The IOL of claim 3 , wherein both the anterior surface of the IOL and a posterior surface of the IOL are recessed to form the reduced thickness region.
5. The IOL of claim 1 , wherein the optic is a monofocal refractive optic.
6. The IOL of claim 5 , wherein the optic is toric, aspheric or both.
7. The IOL of claim 1 , wherein at least out of the outer edge, an anterior surface of the IOL, and a posterior surface of the IOL is textured to diffuse incoming light.
8. The IOL of claim 1 , wherein a radius of curvature of the outer edge is 0.8 mm.
9. The IOL of claim 1 , wherein a radius of curvature of the outer edge is 1.19 mm.