EP0507866A1 - Contact lens for presbyopic persons - Google Patents

Contact lens for presbyopic persons

Info

Publication number
EP0507866A1
EP0507866A1 EP91902711A EP91902711A EP0507866A1 EP 0507866 A1 EP0507866 A1 EP 0507866A1 EP 91902711 A EP91902711 A EP 91902711A EP 91902711 A EP91902711 A EP 91902711A EP 0507866 A1 EP0507866 A1 EP 0507866A1
Authority
EP
European Patent Office
Prior art keywords
central
lens according
recess
lens
peripheral
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP91902711A
Other languages
German (de)
French (fr)
Inventor
Gabriel Elie
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0507866A1 publication Critical patent/EP0507866A1/en
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
    • G02C7/04—Contact lenses for the eyes
    • G02C7/041—Contact lenses for the eyes bifocal; multifocal
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
    • G02C7/08—Auxiliary lenses; Arrangements for varying focal length
    • G02C7/081—Ophthalmic lenses with variable focal length
    • G02C7/085—Fluid-filled lenses, e.g. electro-wetting lenses

Definitions

  • the present invention relates to a contact lens for presbyopic whose optical power varies via an interstitial liquid.
  • the optical system is such that for near vision, the visual rays pass through a liquid contained in a cavity formed in the lens, while in distant vision, they pass to the above the cavity, or through its upper part which is empty of liquid.
  • An object of the present invention is to overcome these drawbacks by providing a contact lens whose focal power is capable of being gradually modified between a minimum value and a maximum value, by actions consisting of movements. usual eyes and eyelids, and without necessarily tilting variations.
  • a presbyopic lens according to the invention is characterized in that it has behind its front face a central recess communicating with a peripheral recess located at least partially in the lower zone of the lens, in that the space comprising said central and peripheral recesses communicating with each other is intended to be completely filled with a liquid, in that the material facing and in front of said recesses is flexible, and elastically deformable opposite and in front of the central recess , so that an action of palpebral compression on said peripheral recess, obtained by an inclined position of the eye or a voluntary narrowing of the palpebral slot, results in swelling of said central recess behind said anterior face, resulting in a modification of curvature in the central area and, therefore, a change in optical power.
  • FIG. 1 is a schematic plan view of a lens according to the invention in a preferred embodiment
  • FIG. 2a is a view in vertical axial section of the lens of FIG. 1, as it appears in distant vision
  • FIG. 2b is a view identical to FIG. 2a, but illustrating the deformation of the anterior face obtained by palpebral pressure on the lower zone of the lens, for close-up vision
  • Figs. 3a to 3c show the same lens in place on one eye, in distant vision in FIG. 3a, in close-up vision with the eye directed downwards in FIG. 3b, and in close-up vision with the eye directed horizontally in FIG. 3c
  • Figs. 3a to 3c show the same lens in place on one eye, in distant vision in FIG. 3a, in close-up vision with the eye directed downwards in FIG. 3b, and in close-up vision with the eye directed horizontally in FIG. 3c
  • FIGS. 5a and 5b are respectively a half-view in plan with representation of the profile and a view in axial section of a first variant of lens according to the invention
  • FIGS. 5a and 5b are the same views of a second variant
  • FIG. 6 is an axial section view of a third variant.
  • the lens of Figs. l to 3c is a flexible double-walled lens: a front wall 1 and a rear wall 2. Between these two walls, a system of cubicles is provided, filled with liquid. This liquid must be able to move from one cubicle to another under the effect of the eyelids.
  • the design and location of the cubicles can be of different shapes.
  • a fan cubicle 3 is located in the lower part. It communicates with a circular cubicle 4 located in the center, or close to it, by a small union channel 5.
  • the lens is optically designed to provide the subject with good distance vision, the gaze in the primary position, that is to say straight ahead, in the position of FIG. 3a.
  • the curvatures of the lens in accordance with the refractive index of the material, are chosen so as to give a clear retinal image of an object situated at infinity.
  • the lower cubicle 3, at this time there, is not subjected to any pressure of the lower eyelid, that is to say that it is located above the lower palpebral edge.
  • the lower fan cubicle 3 passes under the lower palpebral edge.
  • the lower eyelid then presses on this cubicle and drives the liquid towards the central cubicle or small bulb 4 which inflates by forming inside the lens a small meniscus plane convex or close to this shape.
  • the refractive index of the liquid and the induced curvatures must provide an increase in the power of the lens capable of giving the retina a clear image of an object located at normal reading distance.
  • This liquid meniscus will produce a small domed deformation on the anterior surface 6 of the lens, while the posterior surface 7 will remain slightly deformed because of the presence of the cornea against it.
  • the subject wants to look at a close object without looking down, he can produce the same effect of filling the cubicle or central bulb 4 by voluntarily reducing the palpebral slit, Fig. 3c. This tonic movement will press on the fan cubicle 3 and drive the liquid towards the central cubicle 4. Normally, in the horizontal gaze, the subject looks endlessly, and the lens must be designed to provide correction for far vision .
  • the fan cubicle 3 must be of sufficiently large area so that the pressure of the lower eyelid, which is low, is sufficient for an adequate transfer of liquid to the central cubicle 4.
  • the union channel 5 passes closer to the rear face 7 than to the front face 6, so that neither deformation of its walls nor deformation of the front face is generated along its path.
  • its deformation will be slight. If necessary, it will be possible to give its walls increased rigidity, by greater polymerization at its level for example. Furthermore, care will be taken that its diameter is sufficient to in no case cause blockage of the circulation of the liquid.
  • the central cubicle or bulb 4 must have a studied diameter. It does not have to be large and comparable to the average pupil diameter. In fact, in all presbyopia correction lenses, the central zone intended to correct near vision is of small diameter and, however, near vision is usually satisfactory, although slightly blurred by the simultaneous image. of the distant vision system. But what bothers most is the presence of a blur in far vision, due to the persistence, during this far vision, of a second blurred image caused by the cohabitation of the system to see close up. It is therefore important that the unused system is retracted. This is what the invention provides. For that, it is necessary that the cubicle or central bulb 4 empties and that its walls flatten during the far vision, and that it fills during the near vision.
  • the central cubicle 4 will be slightly offset downward relative to the geometric center of the lens. It turns out that the latter has a slight tendency to go up in the gaze downwards relative to the center of the cornea, and the pupil itself has a slight tendency to decenter downwards and inwards in the near vision.
  • the lens must be stabilized. Indeed, the flashes give it a turning movement. However, the fan cubicle 3 must imperatively remain down. It is therefore necessary to use stabilization systems which are already well known since they are used for lenses intended to equip astigmatic eyes. We will use, for example, the device of allegations.
  • An upper relief 8 may even be accompanied by an additional thickness 9 situated just below the upper palpebral edge. In addition to its stabilizing effect, it can also constitute a slight stop for the upper eyelid which pushes the lower part of the lens under the lower eyelid when looking down.
  • a ballast prism 10 can also be provided under the lower cubicle 3.
  • the liquid chosen must not cause a blocking phenomenon. Its refractive index must correspond to the desired optical effect. Its oxygen permeability is desirable so as not to interfere with the oxygen demand of the cornea; as well as the permeability of the lens material.
  • FIGs. 4a to 6 other embodiments of lenses in accordance with the invention are illustrated, that is to say corresponding to the same idea of a lens containing a liquid phase and that the latter, mobilized by the eyelids , generates a deformation causing a change in optical power.
  • a circular cavity is formed over most of the surface, between the walls 1 and 2.
  • This cavity is divided into an annular part 3 'having the same function and substantially the same profile as the cubicle 3 previously described , an intermediate part 5 'tightened by thickening of the material under the front face 6, and a central part 4', to which corresponds in the front wall 1 a zone of least resistance which can be deformed under the pressure of the liquid compressed by palpebral pressure.
  • this lens can be free of stabilization means. However, if the near vision system is offset from the geometric center, these stabilization means become necessary again.
  • Figs. 5a, 5b on the one hand, and 6 on the other hand illustrate lenses similar respectively to the first and second lenses already described, but free of posterior wall. The role of the latter is then played by the cornea of the eye, while the liquid phase consists of tears.
  • the lower cubicle 3, the central cubicle 4 and the union channel 5 are parts in hollow in the rear face 7 of the lens. It is the same for the circular cavity in the rear face 7 of the lens in FIG. 6, which is divided by its profile into a peripheral annular volume 3 ', a central part 4', and a tightened intermediate part 5 ', whose shapes are substantially identical to the same parts of the lens shown in Figs. 4a and 4b.
  • the lenses according to the invention can be made from a single material, but also from several materials, the characteristics of which are chosen according to the parts for which they are intended: in fact, certain parts may have an interest in being more elastic or more rigid than others. Thus, for example, in the embodiments with rear wall, this can be provided rigid. In the same vein, the zones corresponding to the central cubicle, the fan-shaped lodge, or the peripheral annular lodge can be flexible while the other zones are rigid. This possible difference in consistency should be considered more particularly in the variants not having a posterior wall.

Landscapes

  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Eyeglasses (AREA)

Abstract

L'invention concerne une lentille de contact contenant en son sein un liquide susceptible d'être mobilisé par l'effet de pression des paupières. Ce liquide va circuler vers le centre (4) de la lentille, pour provoquer à ce niveau une voussure capable de modifier la puissance de la lentille et la rendre apte à passer de la correction de la vision de loin à la correction de la vision de près, et vice-versa.The invention relates to a contact lens containing within it a liquid capable of being mobilized by the pressure effect of the eyelids. This liquid will circulate towards the center (4) of the lens, to cause at this level a curvature capable of modifying the power of the lens and making it able to pass from the correction of far vision to the correction of vision. close, and vice versa.

Description

LENTILLE DE CONTACT POUR PRESBYTE CONTACT LENS FOR PRESBYTE
La présente invention concerne une lentille de contact pour presbyte dont la puissance optique varie par l'intermédiaire d'un liquide interstitiel.The present invention relates to a contact lens for presbyopic whose optical power varies via an interstitial liquid.
Dans les lentilles de ce type connues à ce jour, le système optique est tel que pour la vision de près, les rayons visuels passent à travers un liquide contenu dans une cavité ménagée dans la lentille, alors qu'en vision éloignée, ils passent au-dessus de la cavité, ou bien à travers sa partie supérieure qui est vide de liquide.In lenses of this type known to date, the optical system is such that for near vision, the visual rays pass through a liquid contained in a cavity formed in the lens, while in distant vision, they pass to the above the cavity, or through its upper part which is empty of liquid.
Dans la demande de brevet français n° 2 369 583 au nom de Glorieux Gilbert, est décrit un système de lentille possédant deux parois au sein desquelles une cavité forme deux espaces dont un' espace supérieur de volume capillaire entourant le centre optique. La cavité n'est que partiellement remplie de liquide et le mécanisme d'action est la capillarité : le système marche par inclinaison de la tête ou des yeux en faisant appel à un niveau de liquide horizontal pour que les forces de capillarité fassent monter le liquide dans ledit espace supérieur.In French Patent Application No. 2369583 in the name of Gilbert Glorieux is disclosed a lens system having two walls within which a cavity form two spaces of which a higher capillary space volume surrounding the optical center. The cavity is only partially filled with liquid and the mechanism of action is capillarity: the system works by tilting the head or the eyes using a horizontal liquid level so that the capillary forces cause the liquid to rise in said upper space.
Ces systèmes de lentille connus sont doublement limités, d'une part en ce qu'ils requièrent nécessairement une inclinaison de l'oeil ou de la tête pour la vision de près, de sorte que celle-ci n'est bonne que pour des objets placés en contrebas de l'oeil; et, d'autre part, en ce que le passage d'une puissance optique à une autre se fait brutalement, selon le principe du "tout ou rien".These known lens systems are doubly limited, on the one hand in that they necessarily require an inclination of the eye or the head for near vision, so that this is only good for objects placed below the eye; and, on the other hand, in that the transition from one optical power to another takes place abruptly, according to the "all or nothing" principle.
Un objet de la présente invention est de pallier ces inconvénients en prévoyant une lentille de contact dont la puissance focale soit susceptible d'être modifiée progressivement entre une valeur minimale et une valeur maximale, par des actions consistant en des mouvements habituels des yeux et des paupières, et sans que des variations d'inclinaison soient forcément nécessaires.An object of the present invention is to overcome these drawbacks by providing a contact lens whose focal power is capable of being gradually modified between a minimum value and a maximum value, by actions consisting of movements. usual eyes and eyelids, and without necessarily tilting variations.
Pour répondre à cet objet, une lentille pour presbyte selon l'invention est caractérisée en ce qu'elle comporte derrière sa face antérieure un évidement central communiquant avec un évidement périphérique situé au moins partiellement dans la zone inférieure de la lentille, en ce que l'espace comprenant lesdits évidements central et périphérique communiquant entre eux est destiné à être rempli totalement d'un liquide, en ce que la matière en regard et en avant desdits évidements est souple, et déformable élastiquement en regard et en avant de 1'évidement central, de sorte qu'une action de compression palpébrale sur ledit évidement périphérique, obtenue par une position inclinée de l'oeil ou un rétrécissement volontaire de la fente palpébrale, se traduise par un gonflement dudit évidement central derrière ladite face antérieure, entraînant une modification de courbure dans la zone centrale et, par conséquent, une modification de puissance optique.To respond to this object, a presbyopic lens according to the invention is characterized in that it has behind its front face a central recess communicating with a peripheral recess located at least partially in the lower zone of the lens, in that the space comprising said central and peripheral recesses communicating with each other is intended to be completely filled with a liquid, in that the material facing and in front of said recesses is flexible, and elastically deformable opposite and in front of the central recess , so that an action of palpebral compression on said peripheral recess, obtained by an inclined position of the eye or a voluntary narrowing of the palpebral slot, results in swelling of said central recess behind said anterior face, resulting in a modification of curvature in the central area and, therefore, a change in optical power.
L'invention sera mieux comprise à l'aide des explications qui vont suivre, et des dessins annexés, parmi lesquels : la Fig. 1 est une vue en plan, schématique, d'une lentille selon l'invention dans une forme de réalisation préférée, la Fig. 2a est une vue en coupe axiale verticale de la lentille de la Fig. 1, telle qu'elle se présente en vision éloignée, la Fig. 2b est une vue identique à la Fig. 2a, mais illustrant la déformation de la face antérieure obtenue par pression palpébrale sur la zone inférieure de la lentille, pour la vision rapprochée, les Figs. 3a à 3c montrent la même lentille en place sur un oeil, en vision éloignée à la Fig. 3a, en vision rapprochée avec l'oeil dirigé vers le bas à la Fig. 3b, et en vision rapprochée avec l'oeil dirigé horizontalement à la Fig. 3c, les Figs. 4a et 4b sont respectivement une demi-vue en plan avec représentation du profil et une vue en coupe axiale d'une première variante de lentille selon l'invention, les Figs. 5a et 5b sont les mêmes vues d'une seconde variante, et la Fig. 6 est une vue en coupe axiale d'une troisième variante.The invention will be better understood using the explanations which follow, and the appended drawings, among which: FIG. 1 is a schematic plan view of a lens according to the invention in a preferred embodiment, FIG. 2a is a view in vertical axial section of the lens of FIG. 1, as it appears in distant vision, FIG. 2b is a view identical to FIG. 2a, but illustrating the deformation of the anterior face obtained by palpebral pressure on the lower zone of the lens, for close-up vision, Figs. 3a to 3c show the same lens in place on one eye, in distant vision in FIG. 3a, in close-up vision with the eye directed downwards in FIG. 3b, and in close-up vision with the eye directed horizontally in FIG. 3c, Figs. 4a and 4b are respectively a half-view in plan with representation of the profile and a view in axial section of a first variant of lens according to the invention, FIGS. 5a and 5b are the same views of a second variant, and FIG. 6 is an axial section view of a third variant.
Dans les dessins, les mêmes références numériques sont partout utilisées pour désigner les mêmes éléments.In the drawings, the same reference numerals are used everywhere to designate the same elements.
La lentille des Figs. l à 3c, représentée dans la forme de réalisation préférée de l'invention, est une lentille souple à double paroi : une paroi antérieure 1 et une paroi postérieure 2. Entre ces deux parois, est ménagé un système de logettes, rempli de liquide. Ce liquide doit pouvoir se déplacer d'une logette à l'autre sous l'effet des paupières.The lens of Figs. l to 3c, shown in the preferred embodiment of the invention, is a flexible double-walled lens: a front wall 1 and a rear wall 2. Between these two walls, a system of cubicles is provided, filled with liquid. This liquid must be able to move from one cubicle to another under the effect of the eyelids.
Le dessin et l'emplacement des logettes peuvent être de différentes formes. Dans l'exemple montré, une logette en éventail 3 est située dans la partie inférieure. Elle communique avec une logette circulaire 4 située au centre, ou proche de celui-ci, par un petit canal d'union 5.The design and location of the cubicles can be of different shapes. In the example shown, a fan cubicle 3 is located in the lower part. It communicates with a circular cubicle 4 located in the center, or close to it, by a small union channel 5.
La lentille est optiquement prévue pour fournir au sujet une bonne vision de loin, le regard en position primaire, c'est-à-dire droit devant soi, dans la position de la Fig. 3a. Les courbures de la lentille, en accord avec l'indice de réfraction du matériau sont choisis de manière à donner une image rétinienne nette d'un objet situé à l'infini. La logette inférieure 3, à ce moment- là, n'est soumise à aucune pression de la paupière inférieure, c'est-à-dire qu'elle se situe au-dessus du bord palpébral inférieur.The lens is optically designed to provide the subject with good distance vision, the gaze in the primary position, that is to say straight ahead, in the position of FIG. 3a. The curvatures of the lens, in accordance with the refractive index of the material, are chosen so as to give a clear retinal image of an object situated at infinity. The lower cubicle 3, at this time there, is not subjected to any pressure of the lower eyelid, that is to say that it is located above the lower palpebral edge.
Lorsque le sujet baisse son regard vers le bas, Fig. 3b, la logette inférieure en éventail 3 passe sous le bord palpébral inférieur. La paupière inférieure appuie alors sur cette logette et chasse le liquide vers la logette centrale ou petite ampoule 4 qui se gonfle en formant à l'intérieur de la lentille un petit ménisque plan convexe ou proche de cette forme. L'indice de réfraction du liquide et les courbures induites doivent apporter une augmentation de puissance de la lentille susceptible de donner sur la rétine une image nette d'un objet situé à la distance normale de lecture. Ce ménisque de liquide produira une petite déformation en dôme sur la face antérieure 6 de la lentille, alors que la face postérieure 7 restera peu déformée à cause de la présence de la cornée contre elle.When the subject looks down, Fig. 3b, the lower fan cubicle 3 passes under the lower palpebral edge. The lower eyelid then presses on this cubicle and drives the liquid towards the central cubicle or small bulb 4 which inflates by forming inside the lens a small meniscus plane convex or close to this shape. The refractive index of the liquid and the induced curvatures must provide an increase in the power of the lens capable of giving the retina a clear image of an object located at normal reading distance. This liquid meniscus will produce a small domed deformation on the anterior surface 6 of the lens, while the posterior surface 7 will remain slightly deformed because of the presence of the cornea against it.
Si le sujet veut regarder un objet proche sans porter son regard vers le bas, il pourra produire le même effet de remplissage de la logette ou ampoule centrale 4 en réduisant volontairement la fente palpébrale, Fig. 3c. Ce mouvement tonique appuiera sur la logette en éventail 3 et chassera le liquide vers la logette centrale 4. Normalement, dans le regard horizontal, le sujet regarde à l'infini, et la lentille doit être conçue pour fournir la correction de la vision de loin.If the subject wants to look at a close object without looking down, he can produce the same effect of filling the cubicle or central bulb 4 by voluntarily reducing the palpebral slit, Fig. 3c. This tonic movement will press on the fan cubicle 3 and drive the liquid towards the central cubicle 4. Normally, in the horizontal gaze, the subject looks endlessly, and the lens must be designed to provide correction for far vision .
A mesure que le sujet baisse son regard, il trouve des objets à une distance moyenne (le sol par exemple), puis de plus en plus proches. Or plus le regard baisse, plus la logette en éventail 3 disparait sous la paupière inférieure, et plus le liquide qui la remplit est sollicité pour être poussé vers la logette centrale 4. Celle-ci se remplira ainsi de plus en plus, en apportant une progressivité dans la puissance fournie. Cette modulation de la puissance peut d'ailleurs être aussi obtenue par un resserrement plus ou moins tonique des paupières. Ces deux modes d'action doivent pouvoir être facilement mis en oeuvre car ils correspondent à des mouvements habituels des yeux et des paupières chez le sujet voulant obtenir une vision de près, soit pendant la lecture, soit pour diaphragmer par ré--ι-écissement âe la fente palpébrale.As the subject lowers his gaze, he finds objects at a medium distance (the ground for example), then closer and closer. However, the more the gaze drops, the more the fan cubicle 3 disappears under the lower eyelid, and the more the liquid which fills it is urged to be pushed towards the central cubicle 4. This will thus be filled more and more, bringing a progressiveness in the power supplied. This modulation of the power can also be obtained by a more or less tonic tightening of the eyelids. These two modes of action must be able to be easily implemented because they correspond to usual movements of the eyes and the eyelids in the subject wanting to obtain a near vision, either during reading, or to diaphragm by re-ι-thinning â e the palpebral cleft.
La logette en éventail 3 doit être de surface assez étendue pour que la pression de la paupière inférieure, qui est faible, suffise pour un transfert adéquat de liquide vers la logette centrale 4.The fan cubicle 3 must be of sufficiently large area so that the pressure of the lower eyelid, which is low, is sufficient for an adequate transfer of liquid to the central cubicle 4.
De préférence, le canal d'union 5 passe plus près de la face postérieure 7 que de la face antérieure 6, afin que ne soient engendrées ni déformation de ses parois, ni déformation de la face antérieure le long de son trajet. En le construisant de section circulaire, sa déformation sera faible. Si nécessaire, on pourra conférer à ses parois une rigidité accrue, par plus grande polymérisation à son niveau par exemple. Par ailleurs, on prendra soin que son diamètre soit suffisant pour ne provoquer en aucun cas de blocage de la circulation du liquide.Preferably, the union channel 5 passes closer to the rear face 7 than to the front face 6, so that neither deformation of its walls nor deformation of the front face is generated along its path. By building it with a circular section, its deformation will be slight. If necessary, it will be possible to give its walls increased rigidity, by greater polymerization at its level for example. Furthermore, care will be taken that its diameter is sufficient to in no case cause blockage of the circulation of the liquid.
La logette ou ampoule centrale 4 doit avoir un diamètre étudié. Il n'est pas nécessaire que celui- ci soit important et comparable au diamètre pupillaire moyen. En effet, dans toutes les lentilles de correction de la presbytie, la zone centrale prévue pour corriger la vision de près est de faible diamètre et, pourtant, la vision de près est d'ordinaire satisfaisante, bien que légèrement brouillée par l'image simultanée du système de vision éloignée. Mais ce qui gêne le plus, c'est la présence d'un flou en vision de loin, dû à la persistance, pendant cette vision de loin, d'une deuxième image floue provoquée par la cohabitation du système à voir de près. II est donc important que le système non employé s'escamote. C'est ce que procure l'invention. Pour cela, il faut que la logette ou ampoule centrale 4 se vide et que ses parois s'aplatissent lors de la vision de loin, et qu'elle se remplisse lors de la vision de près. Lesdites parois devront donc avoir la flexibilité, l'élasticité voulue, pour chasser le liquide lorsque la logette inférieure 3 n'est plus comprimée par la paupière. A noter que la pesanteur aidera à ce vidage. De préférence, la logette centrale 4 sera légèrement décalée vers le bas par rapport au centre géométrique de la lentille. Il s'avère en effet que celle- ci a légèrement tendance à remonter dans le regard vers le bas par rapport au centre de la cornée, et la pupille elle-même a légèrement tendance à se décentrer vers le bas et en-dedans dans la vision de près.The central cubicle or bulb 4 must have a studied diameter. It does not have to be large and comparable to the average pupil diameter. In fact, in all presbyopia correction lenses, the central zone intended to correct near vision is of small diameter and, however, near vision is usually satisfactory, although slightly blurred by the simultaneous image. of the distant vision system. But what bothers most is the presence of a blur in far vision, due to the persistence, during this far vision, of a second blurred image caused by the cohabitation of the system to see close up. It is therefore important that the unused system is retracted. This is what the invention provides. For that, it is necessary that the cubicle or central bulb 4 empties and that its walls flatten during the far vision, and that it fills during the near vision. Said walls must therefore have the flexibility, the elasticity desired, to expel the liquid when the lower cubicle 3 is no longer compressed by the eyelid. Note that gravity will help this emptying. Preferably, the central cubicle 4 will be slightly offset downward relative to the geometric center of the lens. It turns out that the latter has a slight tendency to go up in the gaze downwards relative to the center of the cornea, and the pupil itself has a slight tendency to decenter downwards and inwards in the near vision.
La lentille doit être stabilisée. En effet, les clignements lui impriment un mouvement tournant. Or, la logette en éventail 3 doit impérativement rester vers le bas. Il faut donc faire appel à des systèmes de stabilisation bien connus déjà puisqu'ils sont employés pour des lentilles destinées à équiper des yeux astigmates. On aura recours, par exemple, à l'artifice des allégements. Un allégement supérieur 8 peut même être accompagné d'une surépaisseur 9 située juste en-dessous du bord palpébral supérieur. Outre son effet de stabilisation, celui-ci peut aussi constituer un léger butoir pour la paupière supérieure qui pousse la partie basse de la lentille sous la paupière inférieure lors du regard vers le bas. Eventuellement, un prisme ballast 10 peut aussi être prévu sous la logette inférieure 3.The lens must be stabilized. Indeed, the flashes give it a turning movement. However, the fan cubicle 3 must imperatively remain down. It is therefore necessary to use stabilization systems which are already well known since they are used for lenses intended to equip astigmatic eyes. We will use, for example, the device of allegations. An upper relief 8 may even be accompanied by an additional thickness 9 situated just below the upper palpebral edge. In addition to its stabilizing effect, it can also constitute a slight stop for the upper eyelid which pushes the lower part of the lens under the lower eyelid when looking down. Optionally, a ballast prism 10 can also be provided under the lower cubicle 3.
La viscosité du liquide remplissant les logettesThe viscosity of the liquid filling the cubicles
3 et 4 est étudiée pour que le transfert de liquide entre les deux compartiments ait lieu facilement. Le liquide choisi ne doit pas engendrer de phénomène de blocage. Son indice de réfraction doit correspondre à l'effet optique recherché. Sa perméabilité à l'oxygène est souhaitable pour ne pas gêner la demande en oxygène de la cornée; de même que la perméabilité du matériau de la lentille.3 and 4 is studied so that the transfer of liquid between the two compartments takes place easily. The liquid chosen must not cause a blocking phenomenon. Its refractive index must correspond to the desired optical effect. Its oxygen permeability is desirable so as not to interfere with the oxygen demand of the cornea; as well as the permeability of the lens material.
Aux Figs. 4a à 6, sont illustrées d'autres formes de réalisation de lentilles conformes à l'invention, c'est-à-dire répondant à la même idée d'une lentille contenant une phase liquide et que celle-ci, mobilisée par les paupières, engendre une déformation provoquant un changement de puissance optique.In Figs. 4a to 6, other embodiments of lenses in accordance with the invention are illustrated, that is to say corresponding to the same idea of a lens containing a liquid phase and that the latter, mobilized by the eyelids , generates a deformation causing a change in optical power.
Dans la lentille des Figs. 4a et 4b, une cavité circulaire est formée sur la plus grande partie de la surface, entre les parois 1 et 2. Cette cavité se divise en une partie annulaire 3 ' ayant la même fonction et sensiblement le même profil que la logette 3 précédemment décrite, une partie intermédiaire 5' resserrée par épaississement de la matière sous la face antérieure 6, et une partie centrale 4', à laquelle correspond dans la paroi antérieure 1 une zone de moindre résistance qui peut se laisser déformer sous la pression du liquide comprimé par la pression palpébrale. Bien entendu, du fait de sa symétrie, cette lentille peut être exempte de moyens de stabilisation. Toutefois, si le système de vision de près est décalé par rapport au centre géométrique, ces moyens de stabilisation redeviennent nécessaires.In the lens of Figs. 4a and 4b, a circular cavity is formed over most of the surface, between the walls 1 and 2. This cavity is divided into an annular part 3 'having the same function and substantially the same profile as the cubicle 3 previously described , an intermediate part 5 'tightened by thickening of the material under the front face 6, and a central part 4', to which corresponds in the front wall 1 a zone of least resistance which can be deformed under the pressure of the liquid compressed by palpebral pressure. Of course, due to its symmetry, this lens can be free of stabilization means. However, if the near vision system is offset from the geometric center, these stabilization means become necessary again.
Les Figs. 5a, 5b d'une part, et 6 d'autre part, illustrent des lentilles semblables respectivement aux première et seconde lentilles déjà décrites, mais exemptes de paroi postérieure. Le rôle de cette dernière est alors joué par la cornée de l'oeil, alors que la phase liquide est constituée par les larmes. Dans la lentille des Figs. 5a et 5b, la logette inférieure 3, la logette centrale 4 et le canal d'union 5 sont des parties en creux dans la face postérieure 7 de la lentille. Il en est de même de la cavité circulaire dans la face postérieure 7 de la lentille à la Fig. 6, qui se divise par son profil en un volume annulaire périphérique 3 ' , une partie centrale 4 ' , et une partie intermédiaire resserrée 5 ' , dont les formes sont sensiblement identiques aux mêmes parties de la lentille représentée des Figs. 4a et 4b.Figs. 5a, 5b on the one hand, and 6 on the other hand, illustrate lenses similar respectively to the first and second lenses already described, but free of posterior wall. The role of the latter is then played by the cornea of the eye, while the liquid phase consists of tears. In the lens of Figs. 5a and 5b, the lower cubicle 3, the central cubicle 4 and the union channel 5 are parts in hollow in the rear face 7 of the lens. It is the same for the circular cavity in the rear face 7 of the lens in FIG. 6, which is divided by its profile into a peripheral annular volume 3 ', a central part 4', and a tightened intermediate part 5 ', whose shapes are substantially identical to the same parts of the lens shown in Figs. 4a and 4b.
Les lentilles conformes à 1'invention peuvent être fabriquées en un matériau unique, mais aussi en plusieurs matériaux dont les caractéristiques sont choisies en fonction des parties auxquelles ils sont destinés : en effet, certaines parties peuvent avoir intérêt à être plus élastiques ou plus rigides que d'autres. Ainsi, par exemple, dans les formes de réalisation avec paroi postérieure, celle-ci peut être prévue rigide. Dans un même ordre d'idée, les zones correspondant à la logette centrale, à la loge en éventail, ou à la loge annulaire périphérique peuvent être souples alors que les autres zones sont rigides. Cette éventuelle différence de consistance sera à considérer plus particulièrement dans les variantes ne présentant pas de paroi postérieure. The lenses according to the invention can be made from a single material, but also from several materials, the characteristics of which are chosen according to the parts for which they are intended: in fact, certain parts may have an interest in being more elastic or more rigid than others. Thus, for example, in the embodiments with rear wall, this can be provided rigid. In the same vein, the zones corresponding to the central cubicle, the fan-shaped lodge, or the peripheral annular lodge can be flexible while the other zones are rigid. This possible difference in consistency should be considered more particularly in the variants not having a posterior wall.

Claims

REVENDICATIONS
1) Lentille de contact pour presbyte, comportant derrière sa face antérieure ( 6) un évidement central communiquant avec un évidement périphérique situé au moins partiellement dans sa zone inférieure, la matière en regard et en avant desdits évidements étant souple, caractérisée en ce que l'espace comprenant lesdits évidements central et périphérique communiquant entre eux est destiné à être rempli totalement d'un liquide, et en ce qu'au moins en regard et en avant de l'évidement central, la matière est déformable élastiquement, de sorte qu'une action de compression palpébrale sur ledit évidement périphérique, obtenue par une position inclinée de l'oeil ou une réduction volontaire de la fente palpébrale, se traduise par un gonflement dudit évidement central derrière la face antérieure (6), entraînant une modification de courbure dans la zone centrale et, par conséquent, une modification de puissance optique.1) Contact lens for presbyopic, comprising behind its front face (6) a central recess communicating with a peripheral recess located at least partially in its lower zone, the material facing and in front of said recesses being flexible, characterized in that the space comprising said central and peripheral recesses communicating with each other is intended to be completely filled with a liquid, and in that at least opposite and in front of the central recess, the material is elastically deformable, so that a palpebral compression action on said peripheral recess, obtained by an inclined position of the eye or a voluntary reduction of the palpebral slit, results in swelling of said central recess behind the anterior face (6), resulting in a modification of curvature in the central area and, therefore, a change in optical power.
2) Lentille selon la revendication 1, caractérisée en ce que ledit évidement central a une forme circulaire (4, 4').2) Lens according to claim 1, characterized in that said central recess has a circular shape (4, 4 ').
3) Lentille selon la revendication 1 ou 2, caractérisée en ce que ledit évidement central est décalé par rapport au centre géométrique. 4) Lentille selon l'une des revendications3) Lens according to claim 1 or 2, characterized in that said central recess is offset from the geometric center. 4) Lens according to one of claims
1 à 3, caractérisée en ce que ledit évidement périphérique a une forme annulaire (3 ' ) .1 to 3, characterized in that said peripheral recess has an annular shape (3 ').
5) Lentille selon l'une des revendications 1 à 3, caractérisée en ce que ledit évidement périphérique a une forme en éventail (3) et se trouve dans la partie inférieure, relié à 1"évidement central par un canal d'union (5), et en ce qu'elle comporte également des moyens de stabilisation (8, 9, 10). 6) Lentille selon la revendication 5, caractérisée en ce que ledit canal d'union (5) est écarté de la face antérieure (6).5) Lens according to one of claims 1 to 3, characterized in that said peripheral recess has a fan shape (3) and is located in the lower part, connected to 1 "central recess by a union channel (5 ), and in that it also includes stabilization means (8, 9, 10). 6) Lens according to claim 5, characterized in that said union channel (5) is spaced from the anterior face (6).
7) Lentille selon l'une des revendications 1 à 6, caractérisée en ce que lesdits évidements central et périphérique communicants forment des logettes réunies par ledit canal, constituant ensemble un espace clos entre les parois antérieure (1) et postérieure (2).7) Lens according to one of claims 1 to 6, characterized in that said communicating central and peripheral recesses form cubicles joined by said channel, together constituting an enclosed space between the anterior (1) and posterior (2) walls.
8) Lentille selon la revendication 7, caractérisée en ce que sa paroi postérieure (2) est rigide.8) Lens according to claim 7, characterized in that its rear wall (2) is rigid.
9) Lentille selon 1' ne des revendications 1 à 6, caractérisée en ce que lesdits évidements central et périphérique communicants forment une partie en creux dans la face postérieure (7) , laquelle partie en creux se remplit de larmes et est obturée par la cornée lors de la mise en place sur l'oeil.9) Lens according to one of claims 1 to 6, characterized in that said communicating central and peripheral recesses form a hollow part in the posterior face (7), which hollow part fills with tears and is closed by the cornea when placing on the eye.
10) Lentille selon l'une des revendications 1 à 9, caractérisée en ce que la matière a une souplesse accrue sous la face antérieure (2) au niveau desdits évidements central et périphérique. 10) Lens according to one of claims 1 to 9, characterized in that the material has increased flexibility under the anterior face (2) at said central and peripheral recesses.
EP91902711A 1990-01-05 1991-01-03 Contact lens for presbyopic persons Ceased EP0507866A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9000193 1990-01-05
FR9000193A FR2656933B1 (en) 1990-01-05 1990-01-05 CONTACT LENS FOR PRESBYTE.

Publications (1)

Publication Number Publication Date
EP0507866A1 true EP0507866A1 (en) 1992-10-14

Family

ID=9392616

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91902711A Ceased EP0507866A1 (en) 1990-01-05 1991-01-03 Contact lens for presbyopic persons

Country Status (3)

Country Link
EP (1) EP0507866A1 (en)
FR (1) FR2656933B1 (en)
WO (1) WO1991010154A1 (en)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060290882A1 (en) * 2005-06-27 2006-12-28 Paragon Vision Sciences, Inc. Laminated contact lens
EP2137568A4 (en) * 2007-03-19 2011-01-26 In Technology Holdings Llc Hydrodynamic multifocal contact lens and associated manufacturing techniques
US7866815B2 (en) * 2009-03-30 2011-01-11 Dorothy Mai Win-Hall Accommodating or focusable contact lens
US9046699B2 (en) * 2012-03-13 2015-06-02 Johnson & Johnson Vision Care, Inc. Dynamic fluid zones in contact lenses
US10712588B2 (en) 2012-05-25 2020-07-14 Paragon Crt Company Llc Contact lens having a space
EP2855132B1 (en) 2012-05-25 2019-10-16 Paragon CRT Company LLC Multicomponent optical device having a space
US10049275B2 (en) 2012-05-25 2018-08-14 Paragon Crt Company Llc Multicomponent optical device for visual and audible translation and recognition
US10302968B2 (en) 2013-01-28 2019-05-28 Onefocus Vision, Inc. Fluidic module for accommodating soft contact lens
CA2899432A1 (en) 2013-01-28 2014-07-31 Onefocus Technology, Llc Accomodating soft contact lens
WO2015095891A1 (en) 2013-12-20 2015-06-25 Onefocus Vision, Llc Fluidic module for accomodating soft contact lens
JP2016507081A (en) 2013-01-30 2016-03-07 ワンフォーカス テクノロジー， エルエルシー Manufacturing process for adjustable soft contact lenses
JP2017523482A (en) * 2014-07-31 2017-08-17 ワンフォーカス ビジョン， インコーポレイテッド Control device that responds to burst width
WO2016173620A1 (en) * 2015-04-28 2016-11-03 Optotune Ag Contact and intraocular lenses comprising an adjustable focus length
JP2019505010A (en) 2015-11-11 2019-02-21 ワンフォーカス ビジョン， インコーポレイテッド Perspective adjustment lens with cavity
WO2017083771A1 (en) 2015-11-11 2017-05-18 Onefocus Vision, Inc. Rotationally stabilized contact lens
WO2018089699A1 (en) 2016-11-11 2018-05-17 Onefocus Vision, Inc. Accommodating cavity lens shaped with photocleavable insert
US11460719B2 (en) 2017-05-01 2022-10-04 Pres-By Vision Ltd. Dynamic tear lenses

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1279252A (en) * 1960-07-18 1961-12-22 Optical device at one or more focal lengths
US3614215A (en) * 1970-04-23 1971-10-19 Leo Mackta Fluid bifocal spectacle
FR2369583A1 (en) * 1976-11-02 1978-05-26 Glorieux Gilbert OPTICAL LENS ALLOWING DIFFERENTIAL CORRECTION
US4477158A (en) * 1981-10-15 1984-10-16 Pollock Stephen C Lens system for variable refraction

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9110154A1 *

Also Published As

Publication number Publication date
FR2656933B1 (en) 1993-03-12
FR2656933A1 (en) 1991-07-12
WO1991010154A1 (en) 1991-07-11

Similar Documents

Publication Publication Date Title
EP0507866A1 (en) Contact lens for presbyopic persons
BE1013846A5 (en) Variable spectacle lens for varying the focal length comprises rear ring spaced from the front ring by hinges and with an actuator while inside diameter has line of contact between free area of the membrane
EP0343067B1 (en) Diffractive lens with a composite profile
CH617515A5 (en)
EP0039284B1 (en) Progressive ophthalmic lens
EP0993281B1 (en) Intraocular implant
US8968399B2 (en) Intraocular lens
FR2463940A1 (en) OPHTHALMIC LENS WITH VARIABLE FOCAL POWER
WO2001034066A1 (en) Pre-crystalline intraocular implant
CH656302A5 (en) INTRAOCULAR LENS WITH NEGATIVE POWER AND OPTICAL ASSEMBLY INCLUDING SUCH A LENS.
WO1985002028A1 (en) Universal vision corrector
FR2907559A1 (en) ELECRO-COMMANDABLE OPTICAL COMPONENT COMPRISING A SET OF CELLS
FR2666735A1 (en) Intraocular implant with internal cavity
FR2681524A1 (en) CRYSTALLINE IMPLANT.
FR2617294A1 (en) Cylindrical lens for sunglasses
EP0477109A1 (en) Intraocular implant for correcting myopia
FR2728459A1 (en) Intra=ocular correcting lens
EP0488835A1 (en) Multifocal intraocular lens
EP3691571B1 (en) Assembly consisting of a pair of multifocal ocular implants
FR2582416A1 (en) Bifocal contact lens
EP1660929A1 (en) Optical accommodative compensation system
EP1112045B1 (en) Intraocular implant for anterior chamber
FR2860706A1 (en) Retinal image magnifying system for optical correction of atrophic age-related macular degeneration, has positive power lens, and intraocular lens producing shadow image of object of size lying between twenty and fifty micrometer
FR2789499A1 (en) Support for spectacles on head has frame fitting over head with legs to space it from head surface
WO1995015733A1 (en) Intraocular implant

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE ES GB IT

17P Request for examination filed

Effective date: 19920727

17Q First examination report despatched

Effective date: 19930426

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 19931018