Ophthalmic lens with dynamic focus control

Abstract

The present invention relates to an ophthalmic lens (100) for glasses, which comprises a main glass (120), a secondary glass (160), a main chamber (140) and a film (400), and the film is configured to divide the volume of the main chamber (140) into a first chamber (142) and a second chamber (146).

Description

[0001] This application is a divisional application of the patent application for invention titled "Ophthalmic Lens with Dynamic Focus Control", with the international filing date of July 5, 2017, and the Chinese national application number of 201780042593.X. Technical Field

[0002] The present invention relates to electronic glasses for patients with eye accommodation problems (presbyopia, accommodative spasm, patients after cataract surgery, etc.). More specifically, the present invention relates to one or more ophthalmic lenses. Background Art

[0003] Currently, there are several solutions to compensate for the lack of accommodation in presbyopic patients, such as: glasses, contact lenses, or intraocular lenses.

[0004] Patients can wear several pairs of glasses (optimized for myopia and hyperopia respectively). However, using several pairs of glasses causes ergonomic problems. Alternatively, bifocal glasses can be used. Bifocal glasses have inserts in their lower part, which provide a near field of view when the user looks down. Bifocal glasses are basically reading glasses, and the quality of the middle field of view is poor. Progressive lenses have a continuous correction from the lower part (for reading) to the upper part, and they allow some middle field of view. However, the middle field of view is clear only within a narrow area (the so-called "corridor" of the field of view), and the outside is blurred. In addition, progressive lenses significantly distort the image and bend straight lines. It can be admitted that when the difference in optical power between the top and the bottom is less than 1 diopter, progressive lenses bring good image quality. Considering that for people with advanced presbyopia, a perfect field of view between the far field and the near field requires 3 diopters, progressive lenses still have problems with image quality.

[0005] For contact lenses or intraocular lenses, the main treatment method called "monovision" involves adjusting the contact lenses at two different distances for the left and right eyes. This is obviously an uncomfortable compromise, but the user can wear compensatory glasses for a given fixed object distance (reading, intermediate, or long distance). Another option relies on the so-called multifocal optical system: several images corresponding to the far and near distances are projected onto the retina. The multifocal solution allows reading and viewing at both close and far distances, but always slightly reduces the image quality. With this solution, blurred images may cause problems, such as when driving at night.

[0006] Another solution that can be considered is LASIK (Laser-Assisted in Situ Keratomileusis) or laser surgery. Unfortunately, presbyopic patients have the same drawbacks as mentioned above: only two possibilities are offered, single vision or multifocal. Both of these solutions can cause discomfort and drawbacks. In addition, the surgery is irreversible.

[0007] The present invention relates to a solution to the aforementioned problem: glasses with adjustable refractive power. The aim of this solution is to provide a pair of glasses with lenses, the refractive power of which is variable at least in the central part, with a variation range of up to 3 diopters. By continuously varying the refractive power of its lenses, the wearer will benefit from good vision at close, medium, long or any other distance. The focusing power of the glasses can be manually driven or autofocus. Summary of the Invention

[0008] To achieve this object, according to a first aspect, the present invention provides an ophthalmic lens for glasses, comprising:

[0009] - A main lens: The main lens comprises a first transparent material; the main lens has a first main surface and a second main surface, and the main lens is configured to transmit light through the first transparent material from the first main surface to the second main surface;

[0010] - A secondary lens: The secondary lens comprises a second transparent material; the secondary lens has a first secondary surface and a second secondary surface, and the secondary lens is configured to transmit light through the second transparent material from the first secondary surface to the second secondary surface;

[0011] - A main chamber: The main chamber has a main volume included between the second main surface and the first secondary surface; and

[0012] - A membrane: The membrane comprises a deformable part, the deformable part is partially included in the main chamber, and completely divides the main chamber into at least a first chamber and a second chamber. The first chamber is configured to include at least a main fluid, and the second chamber is configured to include at least a secondary fluid. The first chamber is included between the second main surface and the deformable part, and the second chamber is included between the deformable part and the first secondary surface,

[0013] Characterized in that:

[0014] The main fluid has a first relative density and the secondary fluid has a second relative density; the ratio between the first relative density and the second relative density is between 0.9 and 1.1, specifically, between 0.95 and 1.05, and preferably, between 0.99 and 1.01.

[0015] This ratio between the first relative density and the second relative density avoids membrane deformation due to gravity.

[0016] Glasses with those glasses have a refractive power that is variable at least in the central part, with a variation range of up to 3 diopters. Through continuous deformation of the membrane, the wearer will benefit from good vision at close range, intermediate range, long range, or any other distance. In addition, these ophthalmic lenses provide true visual comfort to the patient.

[0017] According to an embodiment of the present invention, a main glass having a main glass refractive index and a main fluid having a main fluid refractive index are selected such that the difference between the main glass refractive index and the main fluid refractive index is between 0.1×10 -3 and 25×10 -3 and / or a secondary glass having a secondary glass refractive index and a secondary fluid having a secondary fluid refractive index are selected such that the difference between the secondary glass refractive index and the secondary fluid refractive index is between 0.1×10 -3 and 25×10 -3 between.

[0018] According to an embodiment of the present invention, the refractive index is measured at 589 nm.

[0019] According to an embodiment of the present invention, the main glass includes an intermediate main surface that at least partially surrounds the main opening, the secondary glass includes an intermediate secondary surface that at least partially surrounds the secondary opening, and the intermediate main surface and the intermediate secondary surface are configured to minimize residual light scattering at their interface.

[0020] According to an embodiment of the present invention, the roughness of the intermediate main surface and the intermediate secondary surface is less than 100 nm RMS, precisely, less than 50 nm RMS, preferably, less than 20 nm RMS.

[0021] The RMS roughness (RMS stands for root mean square) described in this application can be measured by a surface profilometer.

[0022] Moreover, those skilled in the art will design surfaces, such as interface shapes, to meet a given accuracy level (for example, the given accuracy level can be lower than λ Na / 4, λ Na is the wavelength of sodium light).

[0023] Therefore, this arrangement allows the interface to be as invisible as possible and as effective as possible in correcting the refractive error of the patient at a given object distance.

[0024] According to another embodiment of the present invention, the membrane is partially included between the intermediate main surface and the intermediate secondary surface.

[0025] Thus, this arrangement allows the membrane to be at the level of the intermediate major surface and the intermediate minor surface.

[0026] According to another embodiment of the present invention, the membrane includes a support portion that is partially included between the intermediate major surface and the intermediate minor surface, and the support portion surrounds the deformable portion.

[0027] Thus, this arrangement allows increasing the size of the chamber and simultaneously reducing the weight or quantity of the major glass and / or the minor glass required.

[0028] According to another embodiment of the present invention, the ophthalmic lens includes a major fluid passage that includes a major channel configured to convey the major fluid and enter a first chamber; and a minor fluid passage that includes a minor channel configured to convey the minor fluid and enter a second chamber.

[0029] Thus, this arrangement allows conveying the major fluid and the minor fluid and entering the first chamber and the second chamber respectively.

[0030] According to another embodiment of the present invention, the major channel is partially defined by the major glass and partially defined by the membrane or the minor glass, and / or the minor channel is partially defined by the minor glass and partially defined by the membrane or the major glass.

[0031] Thus, this arrangement allows having channels in the glass, although these components are thin and fragile, or for certain manufacturing reasons.

[0032] According to another embodiment of the present invention, the major channel is completely defined by the major glass, and / or the minor channel is completely defined by the minor glass.

[0033] Thus, this arrangement allows having channels, although the glass is fragile, and / or the channels may not be drilled.

[0034] According to another embodiment of the present invention, the deformable portion is configured to be deformable between a first position, a second position, and a rest position at the level of the major opening and the minor opening; the first position and the second position are configured to be on both sides of the rest position.

[0035] Thus, when the fluid pushes the membrane from one of the first position, the second position, and the rest position, this arrangement allows saving energy. A part of this energy is provided by the elastically deformable property of the deformable portion.

[0036] According to another embodiment of the present invention, the first chamber has a first chamber shape and the second chamber has a second chamber shape, and the first chamber shape is different from the second chamber shape.

[0037] This arrangement avoids overlapping the boundaries of the first chamber and the second chamber to reduce the residual visibility of the boundaries. Depending on the materials selected, it may also be easier to manufacture chambers with different shapes.

[0038] According to another embodiment of the present invention, the film thickness is less than 10 μm, specifically, the film thickness is less than 5 μm, and preferably, the film thickness is less than 1 μm.

[0039] According to another embodiment of the present invention, the ratio between the first relative density and the second relative density is between 0.9 and 1.1 and the film thickness is less than 10 μm, specifically, the ratio between the first relative density and the second relative density is between 0.95 and 1.05 and the film thickness is less than 5 μm, and preferably, the ratio between the first relative density and the second relative density is between 0.99 and 1.01 and the film thickness is less than 1 μm.

[0040] The fact that the ratio of the first relative density to the second relative density is approximately 1 and the film thickness is less than 10 μm allows reducing the stress applied to the film, thereby reducing the deformation of the latter.

[0041] According to another embodiment of the present invention, the refractive power gradient between the top and the bottom of the ophthalmic lens is less than 0.25 D. This configuration of the ophthalmic lens allows for improved optical quality.

[0042] According to another embodiment of the present invention, the main glass includes a first main glass and a second main glass, and / or the secondary glass includes a first secondary glass and a second secondary glass; the first main glass and the second main glass have a first main glass refractive index and a second main glass refractive index respectively, and the first secondary glass and the second secondary glass have a first secondary glass refractive index and a second secondary glass refractive index respectively; the difference between at least one of the first main glass refractive index and the second main glass refractive index and the refractive index of the main fluid is between 0.1×10 -3 and 25×10 -3 and the difference between at least one of the first secondary glass refractive index and the second secondary glass refractive index and the refractive index of the secondary fluid is between 0.1×10 -3 and 25×10 -3 between.

[0043] Therefore, this arrangement allows the interface between the glass and the fluid to be more or less invisible.

[0044] According to another embodiment of the present invention, the refractive index of the main glass is greater than that of the secondary glass, and / or the refractive index of the first main glass is greater than that of the second secondary glass.

[0045] According to another embodiment of the present invention, the main glass is configured to transmit light from the first main surface to the observer by passing light through the first secondary surface of the secondary glass.

[0046] Thus, this arrangement allows the light to be concentrated on the patient at a distance by deforming the membrane in one direction, while the membrane is deformed in another direction for near vision, thereby minimizing the maximum deformation of the membrane and saving energy.

[0047] According to another embodiment of the present invention, the second main glass includes a main channel configured to convey a main fluid and enter the first chamber.

[0048] Thus, this arrangement allows the conveyance of the main fluid.

[0049] According to another embodiment of the present invention, the first secondary glass includes a secondary channel configured to convey a secondary fluid and enter the second chamber.

[0050] Thus, this arrangement allows the conveyance of the secondary fluid.

[0051] The present invention relates to a pair of glasses comprising at least one ophthalmic lens according to one of the foregoing embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The foregoing and other objects, features, aspects, and advantages of the present invention will become apparent from the following detailed description of the embodiments, which are given by way of illustration and not limitation, with reference to the accompanying drawings, in which:

[0053] - Figure 1 shows an exploded view of an ophthalmic lens 100 according to an embodiment of the present invention;

[0054] - Figure 2 shows a cross-sectional view of the ophthalmic lens 100 with refractive index matching according to the same embodiment of the present invention;

[0055] - Figure 3 shows a front view of the ophthalmic lens 100 according to the same or another embodiment of the present invention;

[0056] - Figure 4 shows a cross-sectional view of an ophthalmic lens 100 having a first main glass 200, a second main glass 300, a first secondary glass 500, and a second secondary glass 600 according to another embodiment of the present invention;

[0057] - Figure 5and 6 shows a chamber cross-section with a support membrane 400 and chamber dimensions according to different embodiments of the present invention;

[0058] - Figure 7 shows how the membrane of the ophthalmic lens 100 deforms when activated in the variable region according to another embodiment of the present invention: the dashed line corresponds to the far vision field and the solid line corresponds to the near vision field;

[0059] - Figure 8 shows the positive spherical correction of a hyperopic patient in the far vision field according to another embodiment of the present invention; and,

[0060] - Figure 9 shows the negative spherical correction of a myopic patient in the far vision field according to another embodiment of the present invention.

[0061] Description of the Invention

[0062] General Principles

[0063] The core of the present invention can be shown in Figure 1 : The glass 100 will be mechanically made of a first half 120 and a second half 160. These two halves can each be made of different materials: the first half 120 will have a high refractive index and the second half 160 will have a low refractive index. In each half, the solid transparent material that makes up that half will have a refractive index that can match the refractive index of the fluid in the same half. Thus, each half is composed of a solid material and a fluid, but optically this is equivalent to having a single material because their refractive indices match. After assembling the glass and filling it with the fluid, an external observer will not see any inner surface that might separate the fluid from the solid. Thus, the circuit of the fluid will become invisible. In addition, the bottom of the main chamber 140 will become invisible.

[0064] "Glass" does not solely refer to "silicate glass". In fact, in the present invention, the term "glass" refers to a material or composition that is transparent to visible light or the visible spectrum (which is a part of the electromagnetic spectrum visible to the human eye). Or it also means parts made of those materials.

[0065] Optically, the lens 100 will be similar to a double lens formed by combining a first lens 120 and a second lens 160 of two different optical materials. The overall refractive power, and more generally, the overall optical properties such as refraction and light scattering or dispersion, can depend in a predictable manner on the different characteristics of the geometry of three important surfaces (two outer surfaces and the separating surface). As the outer surfaces, they can be the first major surface 210 of the first lens 120 and the second minor surface 620 of the second lens 160, and the separating surface will be a part of a sphere with a given radius R sep or can be an aspherical surface close to that shape.

[0066] The principle of the variable lens may be that the membrane 400 can be stretched across all the central openings of the lens. The central opening, as Figure 3 shown, can be circular. The edge of the membrane 400 can be fixed by the edge of the circular opening. This means that the shape of the deformable membrane 400 can always be spherical, with a variable radius of curvature. At a given position of the deformable membrane 400, its radius of curvature will coincide with the radius of curvature R of the separating surface between the two halves sep . The choice of this particular position (corresponding to the near or far focus) can be left to the product design. At all other positions of the deformable membrane 400, the radius of curvature of the membrane 400 will be different from the radius of curvature of the separating surface. In these settings that resemble a bifocal lens (a lens with different refractive powers (and thus two different refractive corrections) in two regions), the transition between the two regions is clear and invisible. Additionally, the width of the transition zone should be as small as possible, i.e., there should be no gradient between the two zones.

[0067] The optical variation of such a lens depends on the refractive index difference between two fluids that may be liquids. It may be advantageous to choose the largest possible refractive index difference between the two fluids. For example, a refractive index in the range of 1.33 to 1.43 can be selected for the low refractive index part, where there are many solid transparent materials as well as inert fluids. For the high refractive index part, a refractive index in the range of 1.55 to 1.70 will be preferred, where there are many materials. The following table gives some examples, which may not be comprehensive:

[0068]

[0069]

[0070] Table 1: High refractive index solids

[0071]

[0072] Table 2: High refractive index liquids

[0073]

[0074] Table 3: Low refractive index liquids

[0075]

[0076] Table 4: Low refractive index solids

[0077] Of course, there may be many transparent solids and liquids with various refractive properties that may not be listed here. The above list is intended to show that the choice of fluid can be vast, and by mixing fluids, a very good refractive index match can be achieved between those and the selected materials.

[0078] It may be advantageous to match the refractive indices of the fluid and the solid as closely as possible. However, it is possible to accept a small difference between the two refractive indices, up to the level of a few percent. When using a system with a slight refractive index mismatch, the cavities and channels may become slightly visible or only visible under bright light or special illumination conditions. Such mismatches are acceptable to the user as they do not affect the functionality of the product.

[0079] Most of the optical properties of the system do not depend on the refractive index of the film 400, nor on its thickness, as long as it can be uniform. Only the light transmittance will depend slightly on the refractive index of the film 400, as it will be maximum when the refractive index of the film 400 can be between the low refractive index and the high refractive index. However, in practice, in the case of typical liquid refractive indices, over a wide range of the refractive index of the film 400, the light lost by reflection at the interface of the film 400 will always be less than 1.5%. Generally, the thickness of the film 400 will be a fraction of 1 micron to a few percent of a micron (100 nm to 100 μm).

[0080] Materials for the film 400 include: PDMS and all silicone variants, elastomers of various chemical compositions (based on butadiene, etc.). Fluorinated compounds, especially those soluble in solvents (THV221 from 3M TM ), copolymers and terpolymers sold by Piezotech TM ), Teflon-like materials of the AF1600 class soluble in fluorinated solvents, products sold by Cytonix TM ), etc... Novolac resins and similar resins based on reactive species: epoxy resins, polyurethanes, CR39-type resins, transparent polyesters.

[0081] It is also advantageous to use materials that can be deposited on thin films at low temperatures, such as hexamethyldisiloxane, also known as HMDSO-based materials, evaporated in a chamber and deposited by PECVD (plasma deposition). Soluble polymers (reactive or non-reactive) deposited by spin coating can also be used, such as PMMA (polymethyl methacrylate), PC (polycarbonate), PS (polystyrene) and all resins that can be used for microtechnology work. UV curable products can also be good candidates, acrylics, thiols, epoxy resins and other chemicals.

[0082] The membrane 400 may have to have a combination of mechanical properties (Young's modulus, Poisson's ratio, elastic deformation domain), physicochemical (low equilibrium adsorption of liquids should occur in the material), and transparency.

[0083] The refractive index of the membrane 400 may preferably be in the range between the refractive indices on both sides, and most preferably be the geometric mean of the two refractive indices, so as to minimize the total reflectance of the membrane 400 interface for visible light.

[0084] The bottom part of the main chamber, which may be the second main surface 220 of the first lens 120 and / or the first secondary surface 610 of the second lens 160, will be made optically invisible by refractive index matching. However, in the case of a slight refractive index mismatch, a surface with good optical quality may be beneficial: its shape should be spherical or close to spherical so as not to cause any distortion to the wearer.

[0085] For the same reason that there may be a slight refractive index mismatch, all separation surfaces between the liquid and the solid should be polished surfaces with very low roughness (R a <100nm RMS, precisely, R a <50nm RMS, preferably R a <20nm RMS) in order to minimize the residual light scattering at these interfaces. The RMS roughness can be measured by a surface profilometer.

[0086] Conversely, all these design principles will allow an increase in the acceptable window for refractive index mismatch.

[0087] The same principle applies to the channel shape and design, but not to the bottom cavity.

[0088] In Figure 4 is shown an ophthalmic lens 100, in which more separation surfaces can be used: the solution can use 2 to 4 different materials. These two materials can be refractive index matched with the following materials: the main fluid and the secondary fluid and any one of these materials used for manufacturing the housing, or a third material such as CR39 or PC (polycarbonate), which can be any polymer that can be used for ophthalmic lenses, such as Figure 4 shown. The last solution will be beneficial because the outer surface is similar to traditional glass and it is possible to benefit from all the surface treatments developed by the eyewear industry over the years for eyewear such as anti-reflection coatings, scratch resistance, anti-fogging, colored coatings, etc. According to any combination of the foregoing concepts, 4 or even more different materials can also be used for different shells.

[0089] As in Figure 5Variants that can be observed, where the channels can be more open than in the previous schematic diagram, and the membrane 400 can be supported by a support part 435, which can be thicker and stiffer than the deformable membrane 400. The support part 435 and the deformable part 470 can be made of the same material or different materials. Figure 5 The stack of

[0090] - The first main glass 200 can be made of a conventional material such as CR39, which supports various coatings required in a pair of glasses;

[0091] - The second main glass 300 can have a central opening and a channel leading to the outside. This part can be refractive index-matched to the main fluid;

[0092] - The membrane 400 with the support part 435 can have a circular central opening, which can be covered with a thin deformable membrane;

[0093] - The first secondary glass 500 can have the same central opening and a channel leading to the outside. This component can be refractive index-matched to the second liquid;

[0094] - The second secondary glass 600 can also be made of the same material as the front shell.

[0095] Figure 6 can be shown Figure 5 asymmetric variants of

[0096] Here, for the two compartments, the boundary between the fluid and the solid may not have the same diameter and may not have the same shape. All the separation surfaces between these shells may have to be very well defined. In particular, the different radii of curvature of all the separation surfaces and the front and rear surfaces will determine the overall refractive power of the entire compound lens, which may not be variable as in a single-focus lens. Presumably, this can adjust the refractive error of a user with a far vision. For each other corrective eyewear, different surfaces can be designed to include corrections for astigmatism or prism or any feature to correct eye aberrations. The only difference may be an additional refractive power in the central region for adjusting the field of view at all distances, from long distance to reading distance. In this application, the term central region or central part can refer to the central region or central part of the membrane 400.

[0097] In fact, an example of the implementation according to Figure 5 is to design the glass such that all the separation surfaces are spherical, except for the rear surface, i.e., the second secondary surface 620 of the second lens 160. This second secondary surface 620 can be a free-form surface, allowing for the inclusion of prism and astigmatism corrections, as well as partial refractive corrections required for myopia or hyperopia, with the other part located on the front surface 210 and the intermediate surface.

[0098] Figure 7 Summarizes the optical stack of glasses with extreme positions of the film: in the case where the refractive index of the main glass is higher than that of the secondary glass, the dotted line will show the far vision group, while the solid line shows the near vision position of the film. The rest position of the film is flat between these two extreme positions (not shown).

[0099] These Figure 8 and 9 show how to take into account the patient correction: to obtain a good refractive correction, the infinity vision of each patient's eye should be measured: spectro, astigmatism and spherical error, such as myopia or hyperopia. This correction will be included in the front surface and / or the back surface of the composite glass, as shown in the figure. The figure shows a specific case in which both the back surface and the front surface can be curved to participate in the correction of refractive errors, but only one surface may be used. As in industrial standards, the front surface can also be used for spherical correction and the freeform manufacturing of the back surface can be used to correct astigmatism and more complex corrections. The front surface and the back surface respectively mean the air-main glass interface and the air-secondary glass interface. A separating surface can also be used to participate in the refractive correction of the patient.

[0100] Detailed Description of the Invention According to the First Embodiment

[0101] According to a first embodiment, the present invention relates to an ophthalmic lens 100 for glasses, as Figure 1 shown. The ophthalmic lens 100 may include a main glass 120, a secondary glass 160, a main chamber 140, a film 400, a main fluid and a secondary fluid.

[0102] The main glass 120 may include a first transparent material. The first transparent material may have a refractive index selectable from one of those in Table 1.

[0103] As Figure 1 shown, the main glass 120 may have a first main surface 210 and a second main surface 220. These surfaces may be configured to transmit light from one side or end to the other side or end. More precisely, the main glass 120 may be configured to transmit light through the first transparent material from the first main surface 210 to the second main surface 220.

[0104] The light may further transmit and may pass through the main chamber 140 and the film 400 in order to reach the secondary glass 160.

[0105] The secondary glass 160 may include a second transparent material. The second transparent material may have a refractive index selectable from one of those in Table 4.

[0106] As Figure 1As shown, the secondary glass 160 may have a first secondary surface 610 and a second secondary surface 620. These surfaces may also be configured to transmit light from one side or end to the other side or end. More precisely, the secondary glass 160 may be configured to transmit light from the first secondary surface 610 to the second secondary surface 620 through a second transparent material.

[0107] The main chamber 140 may have a body volume included between the second major surface 220 and the first secondary surface 610, and the main chamber 140 may be defined between the second major surface 220 and the first secondary surface 610.

[0108] In all embodiments, there may be a membrane 400, which may include a deformable portion 470 that may be located in the main chamber 140. In fact, the deformable portion 470 may be partially included in the main chamber 140 and may divide the main chamber 140 completely or partially into at least a first chamber 142 and a second chamber 146. The first chamber 142 may be configured to include a primary fluid, and it, i.e., the first chamber 142, may be included between the second major surface 220 of the main glass 120 and the deformable portion 470.

[0109] On the other side of the membrane 400, there may be a second chamber 146. This chamber may be configured to include a secondary fluid, and it, i.e., the second chamber 146, may be included between the deformable portion 470 and the first secondary surface 610.

[0110] To make the interface between the glass and the fluid invisible, the refractive index of the main glass 120 of the main glass 120 and the refractive index of the primary fluid may actually be close to each other. Specifically, the difference between the refractive index of the main glass 120 and the refractive index of the primary fluid may be between 0.1×10 -3 and 25×10 -3 . This may be the same situation for the interface between the secondary glass 160 and the secondary fluid.

[0111] The secondary glass 160 may have a secondary glass refractive index, and the secondary fluid may have a secondary fluid refractive index, and the difference between them, i.e., the difference between the secondary glass refractive index and the secondary fluid refractive index, may be included between 0.1×10 -3 and 25×10 -3 .

[0112] It may not be necessary to precisely determine the thickness of the membrane 400, which may be very thin such that the interfaces between the primary fluid and the membrane 400 and between the secondary fluid and the membrane 400 do not interfere with the patient's vision.

[0113] During manufacturing, the membrane 400 can be placed on the primary glass 120 or the secondary glass 160. More precisely, the primary glass 120 can include an intermediate primary surface 234 that at least partially surrounds a primary opening within which the membrane 400 can be placed. In this configuration, the membrane 400 can be placed in a position that can be described as a rest position.

[0114] Similar to the primary glass, the secondary glass can include an intermediate secondary surface that at least partially surrounds a secondary opening. The intermediate primary surface and the intermediate secondary surface are configured to minimize residual light scattering at their interface and correct the refractive error of a patient at a given object distance.

[0115] Another way to manufacture the ophthalmic lens 100 can be to place the membrane 400 on the intermediate secondary surface 654 and more precisely place the membrane 400 at the level of the secondary opening, which is referred to as the rest position because no pressure can be exerted on the membrane 400.

[0116] The first chamber 142 can include a first volume that can be sealed by the membrane 400, and the second chamber 146 can include a second volume that can also be sealed by the membrane 400. In other words, the first volume and the second volume can be completely impermeable, which means that no leakage can allow fluid communication between the chambers.

[0117] The above-mentioned chambers, namely the first chamber 142 and the second chamber 146, can be configured to increase or decrease their volume. In fact, this can be the membrane 400, which can be configured to increase or decrease the volume of the chambers. In fact, the deformable portion 470 of the membrane 400 can be configured to be deformed between a first position and a second position. As already mentioned, when no pressure can be exerted, the rest position can be at the level of the primary opening or the secondary opening, and the membrane 400 elastically deforms between a first position and a second position that can be located on either side of the rest position. This technical feature can have the following advantage: when the membrane 400 returns to the rest position and no pressure can be exerted, a part of the elastic force of the membrane 400 can be used. This can allow energy savings.

[0118] To avoid an excessive burden on the membrane 400, when the chambers can be filled with a primary fluid and a secondary fluid, the relative densities can be matched such that the primary fluid has a first relative density and the secondary fluid has a second relative density. The ratio between the first relative density and the second relative density can be included between 0.9 and 1.2, specifically, between 0.95 and 1.06, and preferably, between 0.99 and 1.01. Thus, due to this configuration, gravity can have no effect on the fluid and also no indirect effect on the membrane 400. In other words, no deformation appears on the membrane 400 because the hydrostatic pressures on both sides of the membrane 400 can be equal.

[0119] The density matching between the primary fluid and the secondary fluid can be combined with the mechanical properties of the membrane 400, in particular the lateral tension indirectly derived from the deformation-pressure curve, and with the material properties of the membrane 400 to optimize the optical quality of the lens: When the ophthalmic lens 100 is operated vertically, which means the optical axis is horizontal, there is a significant height difference between the top and the bottom of the ophthalmic lens 100, such that the hydrostatic pressure can vary with height. When the densities of the primary fluid and the secondary fluid exactly match on both sides of the membrane 400, this pressure can be balanced on both sides: Even if the absolute value of the pressure changes, the pressure difference between one side and the other side of the deformable membrane 400 can be eliminated anywhere.

[0120] On the other hand, when there is a density mismatch, this mismatch causes some deformation of the membrane 400, resulting in an optical "coma" aberration. It has been found that there are regions of the parameter space in which this optical aberration is below the specification, resulting in better optical quality. Table 5 below summarizes some configurations of the primary fluid, the secondary fluid, and the membrane thickness.

[0121] In Table 5, the density mismatch ratio represents the ratio between the first relative density of the primary fluid and the second relative density of the secondary fluid. It can be understood that when the refractive power gradient between the top and the bottom of the ophthalmic lens 100 is less than 0.25 D, the optical quality is achieved. In other words, when the ratio between the first relative density and the second relative density is between 0.9 and 1.1 and when the membrane thickness is less than 10 μm, specifically, when the ratio between the first relative density and the second relative density is between 0.95 and 1.05 and when the membrane thickness is less than 5 μm, and preferably, when the ratio between the first relative density and the second relative density is between 0.99 and 1.01 and when the membrane thickness is less than 1 μm, the optical quality is achieved.

[0122]

[0123]

[0124] Table 5: Density Matching Criteria

[0125] The previously described intermediate secondary surface 654 can be formed by the secondary glass 160, and it, i.e., the intermediate secondary surface 654, can at least partially surround the secondary opening. Special attention should also be paid here to the interface between the intermediate primary surface 234 and the intermediate secondary surface 654, and in some other embodiments, equal attention should be paid to the interface between the intermediate primary surface 234 and the membrane 400 and the interface between the intermediate secondary surface 654 and the membrane 400. Effectively, the interface can be configured to minimize residual light scattering. Otherwise, when the eye looks into the distance and at the end of the visual field, the patient may have an unpleasant sensation.

[0126] Since it can be constructed by the reader, special attention can be paid to always providing the ophthalmic lens 100 that is as clear as possible and has improved comfort.

[0127] Detailed Description of the Invention According to the Second Embodiment

[0128] In this second embodiment, all of the aforementioned technical features can be more or less the same in this embodiment. However, in this second embodiment, the membrane 400 may include a support portion 435, and the support portion 435 is partially included between the intermediate major surface 234 and the intermediate minor surface 654. The support portion 435 can surround the deformable portion 470, and in this configuration, the support portion 435 can provide the advantages of increasing the chamber size and simultaneously reducing the weight or quantity required for the major and / or minor glass 160. This technical feature can result in cost reduction, increased visual comfort, and / or facilitation of manufacturing. In fact, since the major glass 120 and the minor glass 160 can have different refractive indices and be made of different materials, the first chamber 142 can have a first chamber shape, and the second chamber can have a second chamber shape, which can have different shapes and / or dimensions from each other. In other words, the first chamber shape can be different from the second chamber shape.

[0129] Detailed Description of the Invention According to the Third Embodiment

[0130] In this third embodiment, the difference from the foregoing embodiments lies in the composition of the major glass 120 and the minor glass 160. In fact, the major glass 120 may include a first major glass 200 and a second major glass 300, and / or the minor glass 160 may include a first minor glass 500 and a second minor glass 600.

[0131] The first major glass 200 can have a first major glass refractive index, and the second major glass 300 can have a second major glass refractive index. The first major glass refractive index can be selected from one of the refractive indices present in Table 1, or from any other optical material. The same can be true for the second major glass refractive index.

[0132] The first minor glass 500 can have a first minor glass refractive index, and the second minor glass 600 can have a second minor glass refractive index. The first minor glass refractive index can be selected from one of the refractive indices present in Table 4. The same can be true for the second minor glass refractive index.

[0133] The difference between at least one of the first major glass refractive index and the second major glass refractive index and the major fluid refractive index can be included between 0.1×10 -3 and 25×10 -3between, and the difference between at least one of the first required glass refractive index and the second required glass refractive index and the refractive index of the secondary fluid may be included between 0.1×10 -3 and 25×10 -3 between. This technical feature may be particularly advantageous because the difference between the glass and the fluid can be negligible, and the patient may feel that the mechanism is almost invisible, which significantly increases the patient's comfort.

[0134] This technical feature can be very convenient because the second main glass 300 may include a main channel configured to deliver the main fluid and enter the first chamber 142, or the first secondary glass 500 may include a secondary channel configured to deliver the secondary fluid and enter the second chamber 146. Since the refractive indices can match, the main channel including the main fluid and the secondary channel including the secondary fluid can be more or less invisible.

[0135] In this entire embodiment, the main fluid can be delivered to the first chamber 142 via the main fluid passage 123, and the secondary fluid can be delivered to the second chamber 146 via the secondary fluid passage 156.

[0136] The main fluid passage 123 may include a main channel configured to be in fluid communication with the first chamber 142. According to one of the foregoing embodiments, the main channel may be partially defined by the main glass 120 and partially by the membrane 400 or the secondary glass 160. For some manufacturing reasons, if the secondary glass 160 cannot be drilled, this technical feature may be noticeable.

[0137] The secondary fluid passage 156 may include a secondary channel configured to be in fluid communication with the second chamber 146. According to one of the foregoing embodiments, the secondary channel may be partially defined by the secondary glass 160 and partially by the membrane 400 or the main glass 120. For some manufacturing reasons, if the secondary glass 160 cannot be drilled, this technical feature may be noticeable.

[0138] In one embodiment, the main fluid passage 123 and the secondary fluid passage 156 may be placed at different horizontal levels to avoid restricting the membrane 400 in the other fluid passage when one fluid can be delivered in its chamber, for facilitating external fluid connection.

[0139] In another embodiment, the main channel may be completely defined by the main glass 120. The same may be true for the secondary channel. This means that the secondary channel may be completely defined by the secondary glass 160.

[0140] It is clear from this description that the main channel or the secondary channel can have their own configurations independently of each other.

[0141] As can be explained from this specification, throughout the embodiments, the low refractive index portion 160 can be included between the high refractive index portion 120 and the eye. In practice, the main glass refractive index can be greater than the secondary glass refractive index, and / or the first main glass refractive index can be greater than the second secondary glass refractive index.

[0142] Some of these technical features can be found in glasses including such an ophthalmic lens 100 or in eyepieces for the following: microscopes, telescopes, binocular microscopes, magnifying glasses, endoscopes, optical viewfinders, donder zoom modules, precision eyepieces, monoculars, binoculars, cameras and projectors, objective lenses, or any device adapted to transmit light before entering the human eye.

[0143] The general public can benefit from these glasses to compensate for the loss of accommodation in daily tasks (reading, watching TV, working on the computer, driving, doing sports, etc...), however, non-presbyopic people can also use it to improve visual accuracy when performing high-precision tasks.

Claims

1. An ophthalmic lens (100) for spectacles, comprising: - A main glass (120): The main glass (120) comprises a first transparent material; the main glass (120) has a first main surface (210) and a second main surface (220), and the main glass (120) is configured to transmit light through the first transparent material from the first main surface (210) to the second main surface (220); - A secondary glass (160): The secondary glass (160) comprises a second transparent material; the secondary glass (160) has a first secondary surface (610) and a second secondary surface (620), and the secondary glass (160) is configured to transmit light through the second transparent material from the first secondary surface (610) to the second secondary surface (620); - A main chamber (140): The main chamber (140) has a main volume included between the second main surface (220) and the first secondary surface (610); And - A film (400): The film (400) comprises a deformable portion (470), the deformable portion (470) is partially included in the main chamber (140), completely dividing the main chamber (140) into at least a first chamber (142) and a second chamber (146), the first chamber (142) is configured to include at least a main fluid, the second chamber (146) is configured to include at least a secondary fluid, the first chamber (142) is included between the second main surface (220) and the deformable portion (470), the second chamber (146) is included between the deformable portion (470) and the first secondary surface (610), the main fluid has a first refractive index and the secondary fluid has a second refractive index, the first refractive index is different from the second refractive index and the first refractive index of the main fluid is greater than the second refractive index of the secondary fluid; the refractive index of the main fluid is in the range of 1.55 to 1.70, and the refractive index of the secondary fluid is in the range of 1.33 to 1.43; the main fluid has a first relative density, and the secondary fluid has a second relative density; the ratio between the first relative density and the second relative density is between 0.9 and 1.1, and The ophthalmic lens is characterized in that the film thickness is less than 5 μm, and at least one surface selected from the first main surface (210) and the second secondary surface (620) is part of a sphere.

2. The ophthalmic lens (100) according to claim 1, wherein, Select a primary glass having a primary glass refractive index and a primary fluid having a primary fluid refractive index such that the difference between the primary glass refractive index and the primary fluid refractive index is between 0.1×10 -3 and 25×10 -3 and / or select a secondary glass having a secondary glass refractive index and a secondary fluid having a secondary fluid refractive index such that the difference between the secondary glass refractive index and the secondary fluid refractive index is between 0.1×10 -3 and 25×10 -3 between.

3. The ophthalmic lens (100) according to any one of claims 1 to 2, wherein, The main glass (120) includes an intermediate main surface (234) that at least partially surrounds a main opening, the secondary glass (160) includes an intermediate secondary surface (654) that at least partially surrounds a secondary opening, and the intermediate main surface (234) and the intermediate secondary surface (654) are configured to minimize the scattering of residual light.

4. The ophthalmic lens (100) according to claim 3, wherein, The film (400) is at least partially included between the intermediate main surface (234) and the intermediate secondary surface (654).

5. The ophthalmic lens (100) according to claim 3, wherein, The membrane (400) includes a support portion (435) that is partially included between the intermediate major surface (234) and the minor surface (654), and the support portion (435) surrounds the deformable portion (470).

6. The ophthalmic lens (100) according to claim 1, comprising a main fluid passageway (123) that includes a main channel configured to convey the main fluid and enter the first chamber (142); and a secondary fluid passageway (156) that includes a secondary channel configured to convey the secondary fluid and enter the second chamber (146).

7. The ophthalmic lens (100) according to claim 6, wherein, The main channel is partially defined by the main glass (120) and partially by the membrane (400) or the secondary glass (160), and / or the secondary channel is partially defined by the secondary glass (160) and partially by the membrane (400) or the main glass (120).

8. The ophthalmic lens (100) according to any one of claims 6 to 7, wherein, The main channel is completely defined by the main glass (120), and / or the secondary channel is completely defined by the secondary glass (160).

9. The ophthalmic lens (100) according to claim 1, wherein, The deformable portion (470) is configured to be deformable between a first position, a second position, and a rest position at the level of the main or secondary opening; the first position and the second position are configured to be on opposite sides of the rest position.

10. The ophthalmic lens (100) according to claim 1, wherein the first chamber (142) has a first chamber shape and the second chamber (146) has a second chamber shape, the first chamber shape being different from the second chamber shape.

11. The ophthalmic lens (100) according to claim 1, wherein, The main glass (120) includes a first main glass (200) and a second main glass (300), and / or the secondary glass (160) includes a first secondary glass (500) and a second secondary glass (600); the first main glass (200) and the second main glass (300) have a first main glass (200) refractive index and a second main glass (300) refractive index respectively, and the first secondary glass (500) and the second secondary glass (600) have a first secondary glass (500) refractive index and a second secondary glass (600) refractive index respectively; the difference between at least one of the first main glass (200) refractive index and the second main glass (300) refractive index and the main fluid refractive index is between 0.1×10 -3 and 25×10 -3 and the difference between at least one of the first secondary glass (500) refractive index and the second secondary glass (600) refractive index and the secondary fluid refractive index is between 0.1×10 -3 and 25×10 -3 between.

12. The ophthalmic lens (100) according to claim 11, wherein, The refractive index of the first main glass (200) is greater than the refractive index of the second secondary glass (600).

13. The ophthalmic lens (100) according to any one of claims 11 to 12, wherein, The second main glass (300) includes a main channel configured to convey the main fluid and enter the first chamber (142), and / or the first secondary glass (500) includes a secondary channel configured to convey the secondary fluid and enter the second chamber (146).

14. A pair of glasses comprising at least one ophthalmic lens (100) according to any one of claims 1 to 13.

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