Fresnel piggyback intraocular lens that improves overall vision where there is a local loss of retinal function

Patent metadata

Field	Value
Publication number	US-10143548-B2
Application number	US-201514849369-A
Country	US
Kind code	B2
Filing date	Sep 9, 2015
Priority date	Mar 10, 2014
Publication date	Dec 4, 2018
Grant date	Dec 4, 2018

Abstract

Systems and methods are provided for improving overall vision in patients suffering from a loss of vision in a portion of the retina (e.g., loss of central vision) by providing a piggyback lens which in combination with the cornea and an existing lens in the patient's eye redirects and/or focuses light incident on the eye at oblique angles onto a peripheral retinal location. The piggyback lens can include a redirection element (e.g., a prism, a diffractive element, or an optical component with a decentered GRIN profile) configured to direct incident light along a deflected optical axis and to focus an image at a location on the peripheral retina. Optical properties of the piggyback lens can be configured to improve or reduce optical errors at the location on the peripheral retina. One or more surfaces of the piggyback lens can be a toric surface, a higher order aspheric surface, an aspheric Zernike surface or a Biconic Zernike surface to reduce optical errors in an image produced at a peripheral retinal location by light incident at oblique angles. One or more surfaces of the piggyback lens can be faceted.

First claim

What is claimed is:

1. An ophthalmic lens configured to improve vision for a patient's eye, the lens comprising:
a Fresnel lens having a first surface and a second surface opposite the first surface, the Fresnel lens having an optical axis that intersects the first and the second surface, wherein the Fresnel lens when disposed in an eye of a patient is configured to reduce optical errors together with a cornea and an existing lens in the eye of the patient due to at least one of astigmatism or coma for light incident at an oblique angle with respect to an optical axis of the eye of the patient and focused at a peripheral retinal location disposed at a distance from the fovea and at an eccentricity of about 1 degree to about 25 degrees with respect to the fovea in a horizontal or a vertical plane, wherein one or both of the first or the second surface is faceted,
wherein one or both of the first or the second surface of the Fresnel lens is configured as a higher order aspheric surface, an aspheric Zernike surface, or a Biconic Zernike surface described by at least one of (i) aspheric coefficients having an order greater than or equal to 8, or (ii) at least six Zernike coefficients, and
wherein a difference between a curvature of the first surface and a curvature of the second surface is such that the Fresnel lens has a refractive optical power less than 0.25 Diopters.

2. The lens of claim 1 , wherein the oblique angle is in a range between about 5 degrees and about 30 degrees with respect to the optical axis of the eye of the patient.

3. The lens of claim 1 , wherein a thickness of the Fresnel lens varies about a periphery of the Fresnel lens.

4. The lens of claim 1 , wherein the Fresnel lens is configured such that when disposed in the eye of the patient, a modulation transfer function (MTF) of the Fresnel lens together with the cornea and the existing lens is at least 0.3 for a spatial frequency of 30 cycles/mm at a wavelength of about 550 nm for both the tangential and the sagittal foci at the peripheral retinal location.

5. The lens of claim 1 , wherein the Fresnel lens is configured such that when disposed in the eye of the patient, a modulation transfer function (MTF) of the Fresnel lens together with the cornea and the existing lens is at least 0.5 for a spatial frequency of 100 cycles/mm at a wavelength of about 550 nm for both the tangential and the sagittal foci at the fovea.

6. The lens of claim 1 , wherein a thickness of the Fresnel lens along the optical axis of the Fresnel lens is between about 0.1 mm and about 0.9 mm.

7. The lens of claim 6 , wherein the Fresnel lens is symmetric about the optical axis of the Fresnel lens.

8. The lens of claim 6 , wherein the Fresnel lens is asymmetric about the optical axis of the Fresnel lens.

9. The lens of claim 1 , wherein the Fresnel lens is configured to be implanted between the iris and the existing lens.

10. The lens of claim 9 , wherein the Fresnel lens is configured to be implanted in the sulcus.

11. The lens of claim 1 , wherein the existing lens is configured to provide foveal vision.

12. The lens of claim 1 , wherein the Fresnel lens includes diffractive features.

13. The lens of claim 1 , wherein the Fresnel lens includes prismatic features.

14. A method of selecting an lens (IOL) configured to be implanted in a patient's eye, the method comprising:
obtaining at least one characteristic of the patient's eye using a diagnostic instrument; and
selecting a Fresnel lens having a first surface and a second surface opposite the first surface the Fresnel lens having an optical axis that intersects the first and the second surface,
wherein light incident on the patient's eye at an oblique angle with respect to an optical axis of the patient's eye is focused at the peripheral retinal location by a combination of the selected Fresnel lens, an existing lens and the patient's cornea,
wherein one or both of the first and the second surface of the Fresnel lens have an asphericity that reduces optical errors due to at least one of astigmatism or coma for light incident at the oblique angle with respect to the optical axis of the patient's eye and focused at a peripheral retinal location of the patient's eye disposed at a distance from the fovea and at an eccentricity of about 1 degree to about 25 degrees with respect to the fovea in a horizontal or a vertical plane,
wherein at least one of the first or the second surface is faceted,
wherein one or both of the first or the second surface of the Fresnel lens is configured as a higher order aspheric surface, an aspheric Zernike surface, or a Biconic Zernike surface described by at least one of (i) aspheric coefficients having an order greater than or equal to 8, or (ii) at least six Zernike coefficients, and
wherein a difference between a curvature of the first surface and a curvature of the second surface is such that the Fresnel lens has a refractive optical power that is substantially 0 Diopter.

15. The method of claim 14 , wherein the obtained characteristic includes axial length along the optical axis of the patient's eye and corneal power.

16. The method of claim 14 , wherein the obtained characteristic is selected from the group consisting of axial length along the optical axis of the patient's eye, corneal power based at least in part on measurements of topography of the cornea, an axial length along an axis which deviates from the optical axis of the patient's eye and intersects the retina at the peripheral retinal location, a shape of the retina, and a measurement of optical errors due to at least one of oblique astigmatism or coma at the peripheral retinal location.

17. The method of claim 14 , wherein at least one of the surfaces of the Fresnel lens includes a redirecting element.

18. The method of claim 17 , wherein the redirecting element comprises a diffractive feature.

19. The method of claim 17 , wherein the redirecting element comprises a prismatic feature.

20. The method of claim 14 , wherein the Fresnel lens is configured such that when disposed in the eye of the patient, a modulation transfer function (MTF) of the Fresnel lens together with the cornea and the existing lens is at least 0.3 for a spatial frequency of 30 cycles/mm at a wavelength of about 550 nm for both tangential and sagittal foci.

21. The lens of claim 1 , wherein the existing lens is a natural lens.

22. The lens of claim 1 , wherein the existing lens is an lens.

23. The method of claim 14 , wherein the existing lens is a natural lens.

24. The method of claim 14 , wherein the existing lens is an lens.

Assignees

• Amo Groningen Bv

Inventors

• Rosen Robert
• Weeber Hendrik A
• Canovas Vidal Carmen
• Van Der Mooren Marrie
• Sellitri Dora
• Piers Patricia Ann

Classifications

• A61F2240/002

  Designing or making customized prostheses · CPC title

• A61F2/1654

  Diffractive lenses · CPC title

• A61F2/1656 Primary

  Fresnel lenses, prisms or plates · CPC title

• A61F2/1602

  Corrective lenses for use in addition to the natural lenses of the eyes or for pseudo-phakic eyes · CPC title

• A61F2/1637 Primary

  Correcting aberrations caused by inhomogeneities; correcting intrinsic aberrations, e.g. of the cornea, of the surface of the natural lens, aspheric, cylindrical, toric lenses · CPC title