Accommodating Intraocular Lens with Combination of Variable Aberrations for Extension of Depth of Field

Abstract

The invention relates to an accommodating intraocular lens, having an optical axis (3), with the lens comprising at least two optical elements (1, 2), and haptics to allow mutual translation of said elements (1, 2) in a direction substantially perpendicular to the optical axis (3), in which at least two of the elements (1, 2) each comprising free-form optical surfaces. The invention also relates to a combination of such lens and an apparatus adapted for measuring the optical power of an eye.

Claims

1. An accommodating intraocular lens, having an optical axis, with the lens comprising at least two optical elements, and haptics to allow mutual translation of said elements in a direction substantially perpendicular to the optical axis, in which at least two of the elements each comprising at least one free-form optical surface adapted to provide variable defocus optical power of which the rate of optical power is depending on the degree of mutual translation of the elements wherein each of the elements comprises at least one additional free-form optical surface providing variable optical power of at least one additional aberration other than defocus with the rate of variable additional aberration optical power depending on the degree of mutual translation of the elements.

2. The lens according to claim 1, wherein the additional free-form surfaces are adapted to provide a variable increase of additional optical power depending on the degree or rate of mutual translation of the elements.

3. The lens according to claim 1, wherein the additional free-form surfaces are adapted to provide a variable decrease of additional optical power depending on the degree or rate of mutual translation of the elements.

4. The lens according to claim 2, wherein the additional free-form surfaces are adapted to provide variable change of additional optical power to provide variable extension of the depth of field of the lens.

5. The lens according to claim 2, wherein the additional free-form surfaces are adapted to provide variable change of additional optical power to provide an increase of the depth of field of the lens.

6. The lens according to claim 4, wherein the additional free-form surfaces are adapted to provide variable change of additional optical power to provide a decrease of the depth of field of the lens.

7. The lens according to claim 1, wherein the additional free-form surfaces are adapted to provide

8. The lens according to claim 1, wherein the additional free-form surfaces are adapted to provide any variable power of any Zernike mode.

9. The lens according to claim 1, wherein the additional free-form surfaces are adapted to provide a combination of multiple variable optical powers of any multiple number of Zernike modes.

10-20. (canceled)

21. The lens according to claim 1, wherein the additional free-form surfaces are adapted to provide variable aspherical variable optical power.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0030] FIG. 1 shows an example of variable extension of depth of field, for an accommodating lens according to the prior art;

[0031] FIG. 2 shows an aberrated, fixed optical system according to the prior art; and

[0032] FIG. 3 illustrates an accommodating intraocular lens with combination of variable aberrations for extension of depth of field, according to the invention.

DESCRIPTION OF THE INVENTION

[0033] FIG. 1-3 show an example of variable extension of depth of field for an accommodating lens comprising additional free-form surfaces for variable aspherical aberration. FIG. 1-2 illustrate prior art to explain the present invention in FIG. 3.

[0034] FIG. 1. A non-aberrated, say, perfect, optical system with sharp focus over the desired range, with an accommodating lens comprising two optical elements, 1, 2, which translate in a direction largely perpendicular to the optical axis, 3, the incoming light beam, 4, the optical axis, 5, the outgoing focused light beam, 6, providing the focal spot for near vision, 7, and, after translation of at least one of the optical element, the outgoing focused light beam, 8, providing the focal spot for far, 9, and the focal range, 10, of the lens.

[0035] FIG. 2. An aberrated fixed optical system with a fixed blurred focus, with the blur, 11, adding extended depth of field at near, 13a, which can be desired, but also adding blur to far, 13b, which is generally undesired because vision at far is more sensitive to image degradation compared to vision at near. This figure shows the effect of, for example, a fixed power aspheric addition to a fixed focus lens, over the desired range, with the blur illustrated by a widened focal spot, a focal tunnel, 12.

[0036] FIG. 3. This figure illustrates an example of the present invention. A variable aberrated optical system with variable blurred focus, provided by, for example, an variable aspheric addition to a variable focus lens, which results in firstly, blur, 16, extending the desired range at near vision, 13a, and, secondly, by variable correction of blur gradually reducing the focal tunnel into, thirdly, a sharp focal spot, 15 at far vision while maintaining the extended focal range as in FIG. 2, 17.

[0037] So, in summary, the present document discloses an accommodating intraocular lens, having an optical axis, with the lens comprising at least two optical elements of which at least one element is adapted to translate in at least one direction largely perpendicular to the optical axis with at least two of the elements each comprising at least one free-form optical surface adapted to provide variable defocus optical power of which the degree of optical power is depending on the degree of mutual shift of the elements with each of the elements also comprising at least one additional free-form optical surface adapted to provide variable optical power of at least one additional aberration other than defocus of which the degree of variable additional aberration optical power is depending on the degree of mutual shift of the elements.

[0038] The additional free-form surfaces can provide a variable increase of additional variable optical power depending on the degree of mutual shift of the elements, or, alternatively, the additional free-form surfaces can provide a variable decrease of additional variable optical power depending on the degree of mutual shift of the elements.

[0039] For example, the additional free-form surfaces can provide variable change of additional variable optical power to provide extension of the depth of field of the lens, or, alternatively, the additional free-form surfaces can provide variable change of additional variable optical power to provide reduction of the depth of field of the lens.

[0040] The additional free-form surface can provide astigmatism variable optical power, or, alternatively, can provide aspherical variable optical power, or, alternatively can provide any variable power of any Zernike mode, or, alternatively, can provide a combination of multiple variable optical powers of any multiple number of Zernike modes.

[0041] The method to provide such a lens can be a pre-operative method which includes, firstly, measurements of the eye to be implanted with the lens including providing measurement of the range of diopter change of at least one variable aberration, secondly, provide conversion of said diopter changes into diopter changes for same aberrations provided by at least two free-form optical surfaces of the lens, and, thirdly, provide manufacturing and implantation of the lens. Alternatively, the method to provide such a lens can be a post-operative method which includes, firstly, measurements of the eye implanted with the lens including providing measurement of the range of diopter change of at least one additional variable aberration, secondly, provide conversion of said diopter changes into diopter changes for same aberrations provided by at least two free-form optical surfaces of the lens, and, thirdly, provide adaptation of said diopter changes of free-form surfaces by any post operative free-form change procedure. The post-operative free-form change procedure can be any procedure, for example, post operative modification of intraocular material by laser treatment, for example femtosecond laser treatment.

[0042] The method to provide such a lens can provide an increase in diopter change of any aberration per unit of translation of the optical elements, for example, but not restricted to, an increase aspheric aberration to provide a desired extension of depth of field as illustrated in FIGS. 1-3.

[0043] Alternatively, the method to provide such a lens can provide a decrease in diopter change of any aberration per unit of translation of the optical elements, for example, a decrease in undesired variable coma or any other undesired variable which degrades visual acuity of the eye.

[0044] The invention further relates to a combination of a lens according to the invention and an apparatus adapted for measuring the optical power of an eye to be provided of an artificial lens and adapted for conversion of the measured optical power into an optical power of the artificial lens.

[0045] In an embodiment, the apparatus is adapted to perform measurements of the eye to be implanted with the lens including providing measurement of the range of optical power change of at least one variable aberration and to provide conversion of said optical power changes into diopter changes for same aberration provided by at least two free-form optical surfaces of the lens.

[0046] In an embodiment (combinable with other embodiments of the invention) the apparatus is adapted to perform measurements of the eye implanted with the lens including providing measurement of the range of diopter change of at least one additional variable aberration, to perform conversion of said diopter changes into diopter changes for same aberrations provided by at least two free-form optical surfaces of the lens, and to perform adaptation of said diopter changes of free-form surfaces by any post operative free-form change procedure.

[0047] In an embodiment (combinable with other embodiments of the invention) the apparatus is adapted to manufacture the lens.

[0048] In an embodiment (combinable with other embodiments of the invention) apparatus is adapted to perform a post-operative free-form change procedure.

[0049] In an embodiment (combinable with other embodiments of the invention) the apparatus is adapted to perform a post-operative free-form change procedure by laser treatment of the lens in situ.