Ophthalmic apparatus with corrective meridians having extended tolerance band

Patent metadata

Field	Value
Publication number	US-10646329-B2
Application number	US-201715467963-A
Country	US
Kind code	B2
Filing date	Mar 23, 2017
Priority date	Mar 23, 2016
Publication date	May 12, 2020
Grant date	May 12, 2020

Abstract

The embodiments disclosed herein include improved toric lenses and other ophthalmic apparatuses (including, for example, contact lens, intraocular lenses (IOLs), and the like) and associated method for their design and use. In an embodiment, an ophthalmic apparatus (e.g., a toric lens) includes one or more angularly-varying phase members comprising a diffractive or refractive structure, each varying the depths of focus of the apparatus so as to provide an extended tolerance to misalignment of the apparatus when implanted in an eye. That is, the ophthalmic apparatus establishes an extended band of operational meridian over the intended correction meridian.

First claim

What is claimed is:

1. A rotationally-tolerant intraocular lens (IOL), the intraocular lens comprising a multi-zonal optic body comprising one or more angularly-varying phase members that each includes an optimized combination of angularly and zonally diffractive phase structure located across one or more optical zones to apply power at one or more correcting meridian, wherein each of the one or more angularly-varying phase members applies the power at a given correcting meridian and vary an extended depth of focus to a plurality of nearby points of focus to provide an extended tolerance to misalignment of the intraocular lens when implanted in an eye,
the multi-zonal optic body forming a first angularly-varying phase member having a peak cylinder power centered at a first correcting meridian, the first angularly-varying phase member at the peak cylinder power being configured to direct light, at the first correcting meridian, to a first point of focus on the retina, wherein at angular positions nearby to the first correcting meridian, the angularly-varying phase member varies, at each optical zone, and is configured to direct light to points of focus nearby to the first point of focus such that the multi-zonal optic body, when rotational offset from the peak cylinder power, directs light from the nearby points of focus to the first point of focus, thereby establishing an extended band of operational meridians over the first correcting meridian,
wherein each phase structure has a height profile at a face of the multi-zonal optic body that varies along the extended band of operational meridians over each respective corrective meridian.

2. The intraocular lens of claim 1 , wherein the multi-zonal lens body forms the angularly-varying phase member, wherein a height profile T1(r, θ) for each meridian θ is defined as:
T 1( r ,θ)= t 1 ( r )|COS 2 (θ)|+ t 2 ( r )|SIN 2 (θ)|

where t 1 (r) and t 2 (r) are the added power for each zone.

3. The intraocular lens of claim 2 , wherein the multi-zonal lens body comprises at least four optical zones, the at least four optical zones forming an angularly varying efficiency quadric optics.

4. The intraocular lens of claim 3 , wherein the angularly-varying phase members, collectively, form a pattern that is expressed as

r
⁡

(
θ
)

=

2
·
n
·

s
⁡

(
θ
)

·
λ

A
⁡

(
θ
)

,

where r(θ) is the contour radius for the given meridian added power A(θ), wavelength λ, zone number n, and the scaling value s(θ), all at meridian θ.

5. The intraocular lens of claim 1 , wherein the angularly-varying phase member spans an optical zone defined by a polynomial-based surface coincident at a plurality of meridians having distinct cylinder powers, wherein each of the plurality of meridians is uniformly arranged on the optical zone for a same given added diopter of power up to 1.0D.

6. The intraocular lens of claim 5 , wherein differences among each continuously uniformly distributed contour line, at a given IOL plane, associated with a given meridian of the plurality of meridians is less than about 0.6D (diopters).

7. The intraocular lens of claim 5 , wherein the polynomial-based surface is characterized by a series of weighted cosine-based functions.

8. The intraocular lens of claim 1 , wherein the one or more angularly-varying phase members each spans a first optical zone defined by a freeform-polynomial surface area coincident with one or more distinct cylinder powers, wherein the freeform-polynomial surface area is defined as a mathematical expression comprising a combination of one or more polynomial expressions each having a distinct complex orders.

9. The intraocular lens of claim 8 , wherein at least one of the one or more polynomial expressions are selected from the group consisting of a Chebyshev polynomial and a Zernike polynomial.

10. The intraocular lens of claim 8 , wherein the freeform-polynomial surface area establishes the extended band of operational meridian across a range selected from the group consisting of about ±4 degrees, about ±5 degrees, about ±6 degrees, about ±7 degrees, about ±8 degrees, about ±9 degrees, about ±10 degrees, about ±11 degrees, about ±12 degrees, about ±13, degrees, about ±14 degrees, and about ±15 degrees.

11. The intraocular lens of claim 8 , wherein the freeform-polynomial surface area has a second height profile T(x,y) on a first base height profile, the second height profile being defined as:
T ( x,y )=Σ{ c ( i,j )*cos( i *arccos( t ))*cos( j *arccos( t ))}

where c(i, j) is a coefficient based on i and j, which are each integers, x and y are spatial locations on the freeform-polynomial surface area, and t is a normalized parameter having values between −1.0 and 1.0.

12. The intraocular lens of claim 11 , wherein the coefficients c(i,j) or c 2 (i 2 , j 2 ) are a function of local coordinates that puts accumulated high surface amplitude to area of non-functional retinal area.

13. The intraocular lens of claim 11 , wherein the coefficients c(i,j) or c 2 (i 2 , j 2 ) are a function of local coordinates that accounts for irregular corneal shape.

14. The intraocular lens of claim 8 , wherein the one or more optical zones includes the first optical zone and a second optical zone, wherein the second optical zone is defined by a second freeform-polynomial surface region characterized and defined by a second polynomial, wherein the second freeform-polynomial surface area has a third height profile T 2 (x,y) superimposed on a first height profile (e.g. a base or typical aspheric height profile), the third height profile being defined as:
T 2 ( x,y )=Σ{ c 2 ( i 2 ,j 2 )*cos( i 2 *arccos( t 2 ))*cos( j 2 *arccos( t 2 ))}

where c 2 (i, j) is a coefficient based on i 2 and j 2 , which are each integers, x and y are spatial locations on the second freeform-polynomial surface area and has values between −1.0 and 1.0, and t 2 is a normalized parameter having values between −1.0 and 1.0.

15. The intraocular lens of claim 14 , wherein the first freeform-polynomial surface area and the second freeform-polynomial surface area each comprises a monofocal lens, a bifocal lens, a multi-focal lens, or an extended range of vision lens.

16. The intraocular lens of claim 1 , wherein the angularly-varying phase member is formed of a refractive structure.

17. The intraocular lens of claim 1 , wherein the angularly-varying phase member is formed of a diffractive structure.

18. The intraoc

Assignees

• Abbott Medical Optics Inc
• Johnson & Johnson Surgical Vision Inc

Inventors

• Zhao Huawei

Classifications

• A61F2/1613

  having special lens configurations, e.g. multipart lenses; having particular optical properties, e.g. pseudo-accommodative lenses, lenses having aberration corrections, diffractive lenses, lenses for variably absorbing electromagnetic radiation, lenses having variable focus · CPC title

• A61F2/1645 Primary

  Toric lenses · CPC title

• A61F2/1654

  Diffractive lenses · CPC title

• G06F30/00

  Computer-aided design [CAD] · CPC title

• G02C2202/02

  Mislocation tolerant lenses or lens systems · CPC title