NL2023333B1 - Accommodating lens for sulcus plane and capsular bag - Google Patents

Abstract

The invention relates to a basic lens construction for an accommodating intraocular lens to be implanted at the sulcus plane of the eye, or, alternatively, to be implanted in the 5 the capsular bag of the eye. The construction can be fitted, if required, With rounded edges for the sulcus plane to prevent iris chafing, or, alternatively, Which construction can be fitted With square edges for the capsular bag, to prevent migration of epithelial cells.

Description

Accommodating lens for sulcus plane and capsular bag Summary Disclosed is a basic lens construction for an accommodating intraocular lens to be implanted at the sulcus plane of the eye, or, alternatively, to be implanted in the the capsular bag of the eye. The construction can be fitted, if required, with rounded edges for the sulcus plane to prevent iris chafing, or, alternatively, which construction can be fitted with square edges for the capsular bag, to prevent migration of epithelial cells.

Text Intraocular lenses, IOLs, for example monofocal and multifocal lenses are well known to treat cataract, cloudiness of the natural lens, by removal of the natural lens to be replaced by an artificial polymer lens, or, alternatively, to treat presbyopia, reading far- sightedness, in a transparent but non accommodating natural lens. Such intraocular lenses can be designed for a specific position in the eye which can be in the posterior chamber of the eye, inside the remnants of the capsular bag from which the natural lens is removed, or, alternatively, in the posterior chamber of the eye, at the sulcus plane of the eye, in front of the remnants of the capsular bag and directly behind the iris, or, alternatively, in the anterior chamber of the eye, in front of the iris.

Monofocal IOLs offer the eye a fixed focus and restore sharp vision in combination with, for example, reading spectacles or progressive focus spectacles. Accommodating IOLs restore sharp vision at a range of distances, up to reading distance, by focusing the eye without the need for spectacles.

[1] The present document discloses a basic lens construction for an accommodating intraocular lens to be surgically implanted in the human eye with the same basic lens construction adapted to be implanted at the sulcus plane of the eye, or, alternatively, inside the remnants of the capsular bag, remnants meaning the capsular bag from which the natural lens is removed through a generally round hole, capsulorhexis, in the anterior section of the bag. [2-3] Such basic lens construction can be designed for implantation in the capsular bag and comprise square edges to prevent migration of epithelial cells into the remnants of the capsular bag, for example, the posterior section of the capsular bag which cells can cause opafication, PCO, or, alternatively, the basic lens construction can be designed for implantation at the sulcus plane and comprise round edges to prevent scraping, chafing, of pigment particles from the posterior surface of the iris.

{41 Such basic lens construction for an accommodating intraocular lens can comprise an optical axis with the construction comprising (i) at least one optical component 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 one combination of at least two free-form optical surfaces, with at least one surface fitted to each optical element with the combination adapted to vary at least one optical aberration of the lens with the degree of variation dependent on the degree of shift of the at least one of the optical elements. Free-form means surfaces which are rotational asymmetrical and shaped according to at least one Zernike polynomial and (ii) with the basic lens construction comprising at least one spring component to translate movement of at least one natural component of the eye to movement of at least one of the optical elements of the basic lens construction. Such accommodating lenses are known from, but not restricted to, the documents WO2005084587, NL2015616 and NL2012133.

[5-7] Such lens comprises at least one combination of free-form optical surfaces is adapted to provide variable correction for at least one optical aberration, which variable aberration can be variable defocus, with varying defocus meaning accommodation, or, any other variable aberration, or, any combination of variable aberrations.

[8-10] Such lens provides said variable correction by translation, movement, of at least one of the optical elements which translation can be shift, a slide, of at least one of the optical elements in a direction largely perpendicular to the optical axis, or, alternatively, rotation of at least one of the optical elements, or, alternatively, a combination of any at least two movements.

[11-15] Translation of the at least one optical element of such lens can be achieved by coupling at least one component of the basic lens to at least one natural component of the eye to drive such translation which component can be, for example, the ciliary mass/ciliary muscle of the eye, or, the capsular bag of the eye, or, the zonular network of the eye.

Alternatively, the translation can be driven by an intraocular artificial component, for example a micro electromechanical system, MEMS to which at least one section of the basic lens construction is coupled.

[16-17] The method for basic lens construction comprises the implantation of the lens construction at the sulcus plane, in front of the remnants of the capsular bag, or, alternatively, implantation inside the remnants of the capsular bag.

Such accommodating basic lens construction can comprise at least one spring haptic adapted to urge at least one optical element back to a resting position, a position of decreased optical power, when the driving means are inactive, or, alternatively, comprise at least one haptic adapted to urge the optical element back to a resting position, a position of decreased optical power, when the driving means are active.

In addition, the basic lens construction can also comprise at least one fixed power optical surface to correct for any fixed optical disorder of the eye, for example, presbyopia, also: reading far-sightedness.

In addition, the basic lens construction can comprise a combination of optical surfaces to correct for any combination of fixed optical disorders and variable optical disorders of which a variable optical disorder can be a disorder generated by the lens construction. Fig. 1 and 2 show the basic lens construction with, in this example, the two optical elements, 1, the optical component with four optical surfaces comprising one anterior optical surface, 2, which can be fitted with, for example, a, generally weak power spherical lens and two intra lenticular surfaces each fitted with at least one free-form optical surface, and one posterior optical surface (backside of the construction, not shown in this illustration), which can be fitted with a, generally strong power spherical lens and elastic hinges, 3, which allow the optical elements to, in this example, slide/move versus each other and which allow the optical elements, in this example, to return to the resting state after the accommodative driving force, from, for example, the ciliary mass of the eye has receded, and fenestrations, 4, which allow intraocular fluids to freely flow from the posterior ocular chamber to the anterior optical chamber, and the connection bridge, 5, between the mechanical section of the construction, the hinges, and the optical section of the construction, the optical elements, and the barrel of the construction, 6, which barrel couples the construction to the component of the eye which drives movement of the optical elements.

So, in summary, the present document discloses a basic lens construction for an accommodating intraocular lens, a lens adapted to be implanted in the human eye with the basic lens construction lens adapted to be implanted in the sulcus of the eye, or, alternatively, to be implanted in the remnants of the capsular bag of the eye which construction can have, if required, but not necessarily so, rounded edges, or, alternatively, square edges, or, alternatively, a combination of rounded edges and square edges, with an example of such lens construction being a basic lens construction comprising an optical axis with the construction 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 one combination of at least two free-form optical surfaces adapted to vary at least one optical aberration of the lens with the degree of variation dependent on the degree of movement of the at least one of the optical elements which elements comprise a combination of {free-form optical surfaces is adapted to provide variable correction of at least one variable optical aberration.

The method for basic lens construction comprises implantation of the lens construction at the sulcus plane, or, alternatively, comprises implantation the lens construction inside the capsular bag.

Claims (17)

Conclusions I. Base lens structure for an accommodating intraocular lens, a lens adapted to be implanted in the human eye, characterized in that the base lens structure is adapted to be implanted in the ciliary body of the eye, or alternatively, in the remains of the capsular sac of the eye. The base lens structure for implantation in the capsular bag according to claim 1, characterized in that the base lens structure comprises edges which edges are rectangular. The basic lens structure for implantation in the radiator as claimed in claim 1, characterized in that the basic lens structure comprises edges which edges are rounded. A base lens structure according to any combination of claims 1-3, characterized in that the base lens structure comprises an optical axis and the structure comprises at least two optical elements, at least one element of which is adapted to move in at least a direction substantially perpendicular to the optical axis, having at least a combination of at least two free-form optical surfaces adapted to vary at least one optical aberration of the lens wherein the amount of variation is dependent on the amount of movement of at least one of the optical elements. The base lens structure of claim 4, characterized in that the combination of free-form optical surfaces is adapted to provide variable correction of at least one variable optical aberration. The base lens structure of claim 5, characterized in that the combination of free-form optical surfaces is adapted to provide variable correction of a variable blur aberration. A base lens structure according to claim 5 or 6, characterized in that the combination of free-form optical surfaces is adapted to provide variable correction for at least one aberration other than blur. A basic lens construction according to claims 4-7, characterized in that the displacement of at least one of the optical elements can be any combination of at least one movement in a plane which is substantially perpendicular to the optical axis. A base lens structure according to claim 8, characterized in that the displacement of at least one of the optical elements is a displacement of at least one optical element. The base lens structure of claim 8, characterized in that the displacement of at least one of the optical elements is a rotation of at least one optical element. A base lens structure according to any combination of claims 1-10, characterized in that at least one haptic element is coupled to at least one natural component of the eye. The base lens structure of claim 11, characterized in that the natural component is the ciliary mass of the eye. The base lens structure of claim 11, characterized in that the natural component is the capular bag of the eye. A base lens structure according to claim 11, characterized in that the natural component is the zonular network of the eye. A base lens assembly according to any combination of claims 1-14, characterized in that the at least one section of the lens is coupled to a MEMS. 16. Application of a basic lens construction, characterized in that the application comprises the implantation of the lens construction in the plane of the radiator. 17. Use of a base lens structure, characterized in that the use comprises implantation of the lens structure within the capsular bag.