Granted Patent B2

US 12,298,605 · App. 18/372,951 · Granted May 13, 2025

Inventors: Ravi Chandra Bakaraju (Kingsford, AU); Klaus Ehrmann (Queenscliff, AU); Arthur Ho (Randwick, AU); Brien Anthony Holden (Kingsford, AU)

Assignee: Brien Holden Vision Institute Limited

G02C7/061A61B3/0025A61B3/1015A61F2/145A61F2/1451A61F2/1613A61F2/1618A61F2/1637G02C7/02G02C7/022G02C7/027G02C7/04G02C7/041G02C7/06G02C7/083A61F2/14A61F2002/1681G02C2202/22G02C2202/24

Abstract

Claims (184)

1. A lens for an eye, the lens having an optical axis, a focal distance and being characterised by:

an aberration profile along the optical axis, the aberration profile:

including at the optical axis a power within 1.0 D of a first power, wherein the first power provides a focal point at the focal distance;

including along a chord diameter through the optical axis at least one region of increased power relative to the first power and at least one region of decreased power relative to the first power;

including higher order aberrations having at least one of a primary spherical aberration component C(4,0) and a secondary spherical aberration component C(6,0), wherein the aberration profile provides, for a model eye with no aberrations and an on-axis length equal to the focal distance:

a retinal image quality (RIQ) with a through focus slope that degrades in a direction of eye growth; and

an on-axis RIQ of at least 0.3;

wherein the RIQ is Visual Strehl Ratio measured substantially along the optical axis for at least one pupil diameter in the range 3 mm to 6 mm, over a spatial frequency range of 0 to 30 cycles/degree inclusive and at a wavelength selected from within the range 540 nm to 590 nm inclusive.

2. The lens of claim 1 , wherein the focal distance is a prescription focal distance for a myopic eye and wherein the focal distance differs from the focal distance for a C(2,0) Zernike coefficient of the aberration profile.

3. The lens of claim 1 , wherein the lens is used for myopia control with or without astigmatism.

4. The lens of claim 1 , wherein the higher order aberrations include at least two spherical aberration terms selected from the group C(4,0) to C(20,0).

5. The lens of claim 1 , wherein the higher order aberrations include at least three spherical aberration terms selected from the group C(4,0) to C(20,0).

6. The lens of claim 1 , wherein the magnitude of higher order aberrations included is at least 0.02 um over a 3 mm, 4 mm, 5 mm or 6 mm pupil diameter.

7. The lens of claim 1 , wherein the average slope over a horizontal field of at least −20° to +20° degrades in a direction of eye growth.

8. The lens of claim 1 , wherein the average slope over a vertical field of at least −20° to +20° degrades in a direction of eye growth.

9. The lens of claim 1 , wherein the aberration profile provides a RIQ of at least 0.3 at the focal length substantially across the pupil diameters in the range 3 mm to 6 mm.

10. The lens of claim 1 , wherein the aberration profile provides a RIQ with a through focus slope that degrades in a direction of eye growth when at least one of primary and secondary astigmatism is added to the aberration profile.

11. The lens of claim 1 , wherein the RIQ is characterised by:

RIQ

=

∫

∫

-

Fmin

+

Fmax

CSF

⁡

(

x

,

y

)

*

(

(

(

FT

⁡

(

❘

"\[LeftBracketingBar]"

FT

⁢

{

A

⁡

(

ρ

,

θ

)

*

exp

[

2

⁢

π

⁢

i

λ

*

W

⁡

(

ρ

,

θ

)

]

}

❘

"\[RightBracketingBar]"

2

)

)

)

)

∫

∫

-

Fmin

+

Fmax

CSF

⁡

(

x

,

y

)

*

(

(

(

FT

⁡

(

❘

"\[LeftBracketingBar]"

FT

⁢

{

A

⁡

(

ρ

,

θ

)

*

exp

[

2

⁢

π

⁢

i

λ

*

W

⁢

diff

⁡

(

ρ

,

θ

)

]

}

❘

"\[RightBracketingBar]"

2

)

)

)

)

,

wherein:

Fmin is 0 cycles/degree and Fmax is 30 cycles/degree;

CSF(x, y) denotes the contrast sensitivity function

CSF(F)=2.6 (0.0192+0.114f)e −(0.114f){circumflex over ( )}1.1 ;

where f specifies the tested spatial frequency, in the range of F min to F max ;

FT denotes a 2D fast Fourier transform;

A(ρ,θ) denotes the pupil diameter;

W(ρ,θ) denotes wavefront phase of the test case measured for i=1 to 20;

W

⁡

(

ρ

,

θ

)

=

∑

i

=

1

k

a

i

⁢

Z

i

(

ρ

,

θ

)

Wdiff(ρ, θ) denotes wavefront phase of the diffraction limited case;

ρ and θ are normalised polar coordinates, where ρ represents the radial coordinate and θ represents the angular coordinate or azimuth; and λ denotes wavelength.

12. The lens of claim 1 including at the optical axis a power within 0.5 D of the first power.

13. The lens of claim 1 including at the optical axis a power equal to the first power.

14. The lens of claim 1 including at the optical axis a power within 0.5D to 1D of the first power.

15. A lens for an eye, the lens having an optical axis, a focal distance and being characterised by:

an aberration profile about the optical axis;

the aberration profile including a) higher order aberrations having at least one of a primary spherical aberration component C(4,0) and a secondary spherical aberration component C(6,0), b) at the optical axis a power within 1.0 D of a first power, wherein the first power provides a focal point at the focal distance and c) along a chord diameter through the optical axis at least one region of increased power relative to the first power and at least one region of decreased power relative to the first power, wherein the aberration profile provides, for a model eye with no aberrations and an on-axis length equal to the focal distance:

a peak Visual Strehl Ratio (first Visual Strehl Ratio) within a through focus range; a Visual Strehl Ratio that remains at or above a second Visual Strehl Ratio over the through focus range that includes said focal distance, wherein the first Visual Strehl Ratio is at least 0.35, the second Visual Strehl Ratio is at least 0.1 and the through focus range is at least 1.8 Dioptres; and

wherein the RIQ is Visual Strehl Ratio measured substantially along the optical axis for at least one pupil diameter in the range 3 mm to 6 mm, over a spatial frequency range of 0 to 30 cycles/degree inclusive and at a wavelength selected from within the range 540 nm to 590 nm inclusive.

16. The lens of claim 15 , wherein the first Visual Strehl Ratio is selected from a group comprising: at least 0.4, at least 0.5, at least 0.6 and at least 0.7.

17. The lens of claim 15 , wherein the first Visual Strehl Ratio is selected from a group comprising: at least 0.1, at least 0.12, at least 0.14, at least 0.16, at least 0.18 and at least 0.2.

18. The lens of claim 15 , wherein the through focus range is selected from a group comprising: at least 1.9, at least 2, at least 2.1, at least 2.2, at least 2.3, at least 2.4 and at least 2.5 Dioptres.

19. The lens of claim 15 , wherein the lens has a prescription focal distance located within 0.25 Dioptres of an end of the through focus range.

Assignments (2)

Priority Claims (2)

Continuity (5)

References Cited (400)