US 12,257,143 B2
Intraocular lens
Demas Sanger, Fukaya (JP)
Assigned to Hoya Medical Singapore Pte. Ltd., Singapore (SG)
Appl. No. 17/779,311
Filed by Hoya Medical Sinapore Pte. Ltd., Singapore (SG)
PCT Filed Nov. 10, 2020, PCT No. PCT/JP2020/041882
§ 371(c)(1), (2) Date May 24, 2022,
PCT Pub. No. WO2021/111821, PCT Pub. Date Jun. 10, 2021.
Claims priority of application No. 2019-220380 (JP), filed on Dec. 5, 2019.
Prior Publication US 2022/0401210 A1, Dec. 22, 2022
Int. Cl. A61F 2/16 (2006.01); G02C 7/02 (2006.01)
CPC A61F 2/16 (2013.01) [A61F 2/164 (2015.04); G02C 7/02 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An intraocular lens comprising
at least three visual acuity correction regions that are concentric with a lens center O at which a predetermined base power is set, and that are adjacent to each other,
wherein the visual acuity correction regions are set as a first region including the lens center O, and a second region and a third region disposed in this order radially from the first region,
when r1 is a position of a first boundary between the first region and the second region, and r2 is a position of a second boundary between the second region and the third region, as viewed radially from the lens center O,
the first region is a region for correcting a visual acuity for far vision or a visual acuity for vision between far vision and intermediate vision,
the second region is a region for correcting a visual acuity for intermediate vision or a visual acuity for near vision,
the third region is a region for correcting the visual acuity for far vision,
a change in power is discontinuous on the first boundary and the second boundary,
a base difference value (exceeding 0 D) obtained by subtracting the base power from a power PB1Low of the first region on the first boundary is less than 50% of a base difference value (exceeding 0 D) obtained by subtracting the base power from a power PB1High of the second region on the first boundary,
an average value (exceeding 0 D) of the base difference values within the first region from the lens center O to the position r1 of the first boundary is greater than 5 times an average value (exceeding 0 D) of the base difference values within the first region from a lens center O of a virtual spherical lens having a base power at the lens center O to the position r1,
the second region has a power resulting from adding one or more positive constant powers to a reference aspheric power, in an area from the position r1 to the position r2, of a virtual aspheric lens that has a base power at the lens center O, and that cancels the whole of a positive longitudinal spherical aberration caused by a cornea,
the power is reduced in the third region so as to provide a negative longitudinal spherical aberration that cancels at least part of the positive longitudinal spherical aberration caused by the cornea,
a second step value constituted by a value obtained by subtracting a power PB2Low of the third region from a power PB2High of the second region on the second boundary is greater than a first step value constituted by a value obtained by subtracting the power PB1Low of the first region from the power PB1High of the second region on the first boundary, and
the power PB2High of the second region on the second boundary is greater than the base power, and the power PB2Low of the third region on the second boundary is less than the base power.