Multifunctional device for an ophthalmic lens

A multifunctional device for an ophthalmic lens or ophthalmic lens blank, comprising an electrochromic layered module and an ophthalmic power layered module, both modules being on the same support layer.

TECHNICAL FIELD

The present invention relates to the technical field of ophthalmic lenses with active functions such as electrochromic and ophthalmic power functions. More specifically, the present invention relates to multifunctional device for an ophthalmic lens or ophthalmic lens blank with an electrochromic layered module and an ophthalmic power layered module.

PRIOR ART

Compared with plain ophthalmic lenses, ophthalmic lenses with active functions are adaptable to conditions or purpose of use.

For example, in comparison with a photochromic ophthalmic lens which provides a darkening thereof when exposed to UV rays, an electrochromic ophthalmic lens makes it possible to provide a darkening thereof, so that darkening may be tuned to the environment of the wearer independently from the presence of UV rays.

Another example is an ophthalmic lens with an ophthalmic power module that divides the surface of the ophthalmic lens into portions and tunes the ophthalmic power in each portion to the need of the wearer. Thus, the ophthalmic lens may follow the evolution of the wearer's vision or be adapted to the activity of the wearer such as reading versus watching a screen versus looking at far distance. The ophthalmic lens may also be used by multiple persons with different correction needs.

Active functions may even be combined to enhance the adaptability of the ophthalmic lens. For example, US 20050036109 describes an ophthalmic lens with multiple active functions.

Unfortunately, the ophthalmic lens described therein is bulky because each active function necessitates one glass substrate to support it.

Further, especially for the application requiring the provision of an LCD and an electrochromic functions on a same ophthalmic lens, assembly may be quite burdensome due to the need of a precise alignment between two elements that are manufactured separately. Shaping of the ophthalmic lens may also become difficult.

Thus, there is still a need to provide a handier ophthalmic lens with multiple active functions which is easier to manufacture.

SUMMARY OF THE INVENTION

One aim of the invention is to overcome one drawback of the prior art.

To this aim, the invention provides a multifunctional device for an ophthalmic lens or ophthalmic lens blank, comprising a support layer, an electrochromic layered module and an ophthalmic power layered module, whereina part of one face of the support layer, called EC part, forms part of the electrochromic layered module, anda part of one face of the support layer, called OP part, forms part of the ophthalmic power layered module, and

wherein the support layer comprises electric connections to the electrochromic layered module and the ophthalmic power layered module.

Thanks to the multifunctional device of the present invention, ophthalmic lenses or ophthalmic lens blanks with multifunctional active functions may be made lighter; indeed, a single substrate supports both functions. Also, thickness is reduced. It is possible to create required complex printed pattern only on one or both side of the support layer, easing the manufacturing process because only one element needs to be handled. Because the support layer may be patterned on both its faces, the alignment, which sometime may require micrometric precise and/or accurate, may be carried out directly during patterning thus facilitating any subsequent handling.

Other optional and non-limiting features of the multifunctional device are as follows.

The EC-part-bearing face of the support layer and the OP-part-bearing face of the support layer may be opposite faces of the support layer.

The electrochromic layered module may further comprise a continuous transparent conductive layer directly in contact with the EC part. In which case, the electrochromic layered module may further comprise a liquid crystal layer directly on the continuous transparent conductive layer, a second continuous transparent conductive layer directly on the liquid crystal layer, and a protective layer directly on the second continuous transparent conductive layer.

The ophthalmic power layered module may comprise a transparent conductive layer comprising transparent conductive strips oriented in a first direction directly in contact with the OP part. In which case, the ophthalmic power layered module may further comprise a second transparent conductive layer comprising transparent conductive strips oriented in a second direction perpendicular to the first direction, a liquid crystal layer directly between both transparent conductive layers comprising transparent conductive strips, the liquid crystal layer also filling the space between the strips, and a protective layer directly on the second transparent conductive layer comprising transparent conductive strips.

The electric connections may be provided on at least one side edge of the support layer.

The electrochromic layered module may further comprise a printed light sensor. In which case, the electrochromic layered module may further comprise a processor connected to the light sensor. Additional or alternatively, the ophthalmic power layered module may further comprise a controller connected to the light sensor of the electrochromic layered module which is adapted to control the ophthalmic power according to the light received by the light sensor. In this latter case, the controller may be connected to the light sensor through the electric connections of the support layer.

The invention also provides an ophthalmic lens or ophthalmic lens blank comprising the multifunctional device described above. The side edge of the support layer may be flush with the side edge of the ophthalmic lens or ophthalmic lens blank.

The invention also provides a spectacle comprising at least one ophthalmic lens described above.

The invention further provides a method for manufacturing a multifunctional device described above. The method comprises:providing an electrochromic layered module onto a part of one face of the support layer; andproviding an ophthalmic power layered module onto a part of one face of the support layer.

DESCRIPTION

In the whole description and claims, the words “front”, “back”, “up”, “low” and their words derived therefrom are to be understood with reference to the position of the eye of the user of the MF device. Thus, “front” in opposition to “back” designates a position that is farther from the eye of the user, while “back” is closer. Similarly, “up” designates a position that is closer to the upper lid, while “low” is closer to the lower lid.

A multifunctional device (hereafter MF device)1for an ophthalmic lens or ophthalmic lens blank will be described hereafter in reference toFIGS. 1 to 14.

The MF device1comprises a support layer2, an electrochromic layered module (ECL module)3and an ophthalmic power layered module (OPL module)4. The MF device1may either be fixed or embedded into an ophthalmic substrate5, that is to say a substrate suitable for making ophthalmic lens, for example a glass substrate or a plastic substrate. Alternatively, the support layer2of the MF device1may be the ophthalmic substrate itself.

The ECL module3enables the MF device1to darken or to brighten.

The OPL module4enables the MF device1to provide ophthalmic correction to the wearer or a display function.

Unlike the prior art, a part (hereafter EC part for “electrochromic part”) of one face of the support layer2forms part of the ECL module3, and a part (hereafter OP part for “ophthalmic power part”) of one face of the support layer2forms part of the OPL module4. Although it is referred in the following to one EC part and to one OP part, the singular must be understood as encompassing the plural. Thus, a plurality of EC parts may be provided on one face of the support layer and positioned at desired locations. Their size may be various: wide or small. In the latter case, they may be scattered over a portion of the corresponding face of the support layer. In this same manner, a plurality of OP parts may be provided on one face of the support layer and positioned at desired locations. Their size may also be various: wide or small. In this latter case, they may also be scattered over a portion of the corresponding face of the support layer.

The ECL module3generally comprises an electrochromic function layer (ECF layer)32between two end layers31,33. Thus, when saying that one face of the support layer2forms part of the ECL module3, this means that the support layer2on that face forms one of the end layer31of the ECL module33.

The ECF layer32may comprise a continuous transparent conductive layer (CTC layer)321directly in contact with on end layer31thereof. The ECF layer32may then further comprise an electrochromic medium322directly on and in contact with the CTC layer321on one side and with the other end layer33on the other side, this latter forming a protective layer. The electrochromic medium322may be a liquid crystal layer (LC layer), or a composition comprising electrochromic oxidizing compounds and/or reducing compounds in a solvent, such as those described in EP2848669, EP2848667, EP2848668 or EP2848670, or a solid state electrochromic layer, such as those described in WO2014121263 or WO2014113685. Solid state electrochromic layers may be obtained by deposition of a thin layer of at least one electrochromic compound on an electrically conductive substrate by electrodeposition or by a non-electrolytic route. Solid state electrochromic layers may include inorganic nanostructured layers made of WO3, V2O5, NiO, Ir2O3, MoO2, layers made of hexacyanometallates such as the hexacyanoferrates of iron (for example, Prussian blue), vanadium, ruthenium, cadmium, chromium, palladium or platinum. Solid state electrochromic layers may include organic compounds deposited on an electrically conductive substrate, such as viologens or conjugated polymers, such as polythiophene, and its derivatives, in particular poly(3,4-ethylenedioxythiophene), polypyrrole, polyaniline.

Optionally, the ECF layer32comprises a second CTC layer323between the medium322and the other end layer33so that the second CTC layer323is directly on and in contact with the electrochromic medium322on one side and with the other end layer33on the other side.

Each of the CTC layers321,323may be chosen from derivatives of tin oxide, of indium oxide and of zinc oxide. Mention may be made in particular of fluorine-doped tin oxide (FTO, fluor tin oxide), tin-doped indium oxide (ITO, indium tin oxide), antimony-doped tin oxide and aluminium-doped zinc oxide. Tin-doped indium oxide (ITO) is particularly preferred.

Each of the end layers31,33may be independently in glass or plastic. Each of the end layers31,33may be independently made of the same material as the support layer2.

The OPL module4generally comprises an ophthalmic power function layer (OPF layer)42between two end layers41,43. When saying that one face of the support layer2forms part of the OPL module4, this means that the support layer2on that face forms one of the end layer41of the OPL module4.

The OPF layer42may comprise a transparent conductive layer (TC layer) comprising transparent conductive first strips (TC1 strips)421oriented in a first direction directly in contact with the end layer41thereof, the TC1 strips421being parallel to one another. In which case, the OPF layer42may further comprise a second TC layer comprising transparent conductive second strips (TC2 strips)423oriented in a second direction perpendicular to the first direction, the TC2 strips423being parallel to one another. The OPF layer42further comprises a LC layer422directly between and in contact with both TC layers comprising TC strips421,423, the LC layer422also filling the space between the TC strips421,423. The other end layer43is directly on and in contact with the second TC layer comprising TC2 strips423and forming a protective layer.

Each of the TC layers may be chosen from derivatives of tin oxide, of indium oxide and of zinc oxide. Mention may be made in particular of fluorine-doped tin oxide (FTO, fluor tin oxide), tin-doped indium oxide (ITO, indium tin oxide), antimony-doped tin oxide and aluminum-doped zinc oxide, a layer with a plurality of silver nanowire. Tin-doped indium oxide (ITO) is particularly preferred.

Alternatively, the OPL module4may comprise an OLED display or Micro Led display. Alternatively still, the OPL module4may comprise OLEDs printed on the support layer2, preferably continuously scattered on the support layer2. The OLEDs are preferably micro blue OLEDs.

The OPL module4mays be one of an electrofocus layered module (hereafter EFL module), a holographic mirror module (hereafter HM module) or a spatial light modulator module (hereafter SLM module).

“Holographic mirrors” (HM) are known in the art. The minor is defined as a holographic minor, if it was recorded using a holography process. But according to the invention, the holographic mirror is for visualization purposes. This mirror is used to reflect a light beam generated from an image source, so as to cause the visualization of the image by the wearer. The holographic minor is not used to reconstruct a recorded holographic image (as is the case in traditional hologram viewing). Due to the recording, advantageously according to the invention, the mirror is imparted an optical function, that is able, where applicable, to modify the wavefront of the light beam stemming from the image source upon reflection onto said mirror. This enables to correct the virtual vision of the wearer, because the lens of the invention (when incorporating the minor) can modify the light beam that generates the image in the eye of the wearer.

In some embodiments, the holographic minor (HM) comprises an array of individually tuneable recorded holographic pixels. For example, the array may be an array of polymer dispersed liquid crystals (PDLC) or of holographic polymer dispersed liquid crystals (H-PDLC). In such embodiments, the pixel size may be at least 50 μm.

The virtual image is thus not necessarily a holographic image. It can be any virtual image, such as a 2D or 3D image. The nature of the image results from the nature of the image source, not from the holographic nature of the holographic mirror. It is possible to use, as an image source, a holographic image source, in which case the virtual image is a holographic image.

The mirror used in accordance with the invention is tunable, in that one or more of its optical properties, for one or more parts or areas of said mirror, can be tuned. This means that said one or more optical properties can be adjusted, activated, deactivated, switched (ON or OFF), and/or synchronized with the image source, etc.

“Spatial light modulators” (SLM) are known in the art. Said SLM can be a phase SLM, a phase-only SLM, an amplitude-only SLM, or a phase and amplitude SLM. Where present, the amplitude modulation is preferably independent from the phase modulation, and allows for a reduction in the image speckle, so as to improve image quality in terms of levels of grey. In preferred embodiments, the SLM is a phase or a phase-only SLM. According to the invention, the SLM acts as a ‘programmable’ hologram, namely an electronically addressable reading support that allows the display of the desired holographic image.

Preferably, the OPL module4presents a position on the lower part of the support layer2, while the ECL module3presents a position on the upper part of the support layer2or covers the latter entirely (thus overlapping with the OPL module4). The ECL module and the OPL module are said to overlap when their projections perpendicularly to the average plane of the support layer onto a same plane overlap on that latter plane. The separator(s) may be made of optical glue.

The same face of the support layer2, e.g. the front face or the back face thereof, may form both part of the ECL module3and part of the OPL module2. In other words, the EC part and the OP part are both on the same face of the support layer2. In this configuration, the ECL module3and the OPL module4preferably share their end layers31,41. In this case, the ECF layer32of the ECL module3and the OPF layer42of the OPL module4may be separated at their lateral edges through a separator6, preferably a liquid-tight separator, or by a gap of gas, such as air, or material, such as the same material as that of the support layer2; each of the ECF layer32of the ECL module3and OPF layer42of the OPL module4being separated from the gap by a separator6, preferably an air-tight and liquid-tight separator.

In this case, there is usually another support layer2′ forming both part of the ECL module3and OPL module4(notably their other end layers33,43) so that they are sandwiched between both support layers2,2′.

Alternatively, one face of the support layer2forms part of the ECL module3and the other face of the support layer2forms part of the OPL module4. In other words, the EC part is on one face of the support layer2and the OP part in on the other. In this latter configuration, the support layer2is an intermediate support layer. The position of the EC part may be at the front and the position of the OP part at the back. Alternatively, the position of the EC part is at the back and the position of the OP part at the front.

The EC part may cover the entire corresponding face or only part thereof. Alternatively or additionally, the OP part may cover the entire corresponding face or only part thereof.

The ECL module3may further comprise a printed light sensor. The light sensor makes it possible to tune the electrochromic effect based on the environment's lighting. Indeed, usually if the environment's lighting is low, the electrochromic effect needs to be deactivated. In which case, the ECL module3may further comprise a processor connected to the light sensor. Additional or alternatively, the OPL module4may further comprise a controller connected to the light sensor of the ECL module3which is adapted to control the ophthalmic power according to the light received by the light sensor. In this latter case, the controller may be connected to the light sensor through the electric connections of the support layer. For example, the controller may be connected to the light sensor by direct wires soldered on the ECL module and/or OPL module or by flex cable and connectors that are previously soldered on the ECL module and/or OPL module. Controller may alternatively be integrated directly on the ECL module and/or OPL module, and connected to other active component and light sensor by ITO or other printed conductive wires.

The light sensor may be any light sensor known to the skilled person.

Ambient light sensor like Rohm BH1721FVC could be used, or more complex light sensors as AS7264 from AMS where different light wavelength can be analyzed, that enable to adapt the EC function to different colour light.

The support layer2is typically a single block of material. The support layer may be in glass or plastic.

The support layer2may be a thin layer of material, the purpose of which is dedicated to the support of the ECL module3and OPL module4. In this case, the thickness of the thin layer of material forming the support layer2may be 50 μm to 2000 μm. Intermediate lower and higher range values may be 100 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, 1000 μm, 1250 μm, 1500 μm and 1750 μm. Particularly, its thickness is between 100 μm and 1000 μm when the ECL part and the OPL part are on the same face of the support layer. Particularly, its thickness is between 300 μm and 1000 μm when the ECL part and the OPL part are on opposite faces of the support layer.

The whole assembly, support layer2with the ECL module3and OPL module4is then attached to an ophthalmic lens or ophthalmic lens blank5, either at the front face or at the back face thereof. That is to say either the other end layer33,43of the ECL module3or OPL module4not being the support layer is attached to the ophthalmic lens or ophthalmic lens blank5, typically with optical glue.

Alternatively, the support layer2may be at least part or the whole part of the substrate of an ophthalmic lens or ophthalmic lens blank5. The ECL module3and OPL module4may be on the front face or the back face thereof. When the ECL module3and OPL module4are on two different side of the support layer2, one can be on the front face of the ophthalmic lens or ophthalmic lens blank and the other on the back face thereof.

The support layer2may comprise a recess21(for example seeFIG. 13) on one of its face to house the other elements of the ECL module3and/or OPL module4so that the corresponding module is fully housed inside the recess21of the support layer2. In this case, either the support layer2forms both end layers31,33;41,43of the corresponding module (thus embedding the corresponding module) or only one end layer31,41and the other end layer33,43is a protective layer.

The support layer2may comprise an excess of thickness22(for example seeFIG. 14) on one of its face to support the other elements of the ECL module3and/or OPL module4so that the corresponding module is somewhat raised. This is particularly advantageous when the support layer2is a thin layer of material and that the assembly of support layer2, ECL module3and OPL module4is to be attached to an ophthalmic lens or ophthalmic lens blank5with a recess51on its face to be attached to the face of the support layer2presenting the excess of thickness22.

The support layer2comprises electric connections to the ECL module3and the OPL module4. The electric connections may be provided on at least one side edge of the support layer. These electric connections may be configured for various purposes such as powering the ECL module3and the OPL module4. They can also be configured for connections to other devices and/or mutual connection between both modules, for example for a communication purpose. An electric connection may be provided only at one side edge of the support layer. Electric connections may also be provided across the face of the support layer on which the ECL module3and/or the OPL module4is provided, for example for connecting a plurality of ECL modules3and/or OPL modules4.

The support layer2may also be a patterned or engraved intermediate support layer such that one or both of its faces present a pattern, preferably a micrometric pattern, notably for providing the support layer with electric wires and connections or electric components that can be created through surface patterning or engraving such as signal transmitter, polariser, transistor, sensor, isolator, and any active optic, for example electrochromic material, phase changing material and more. Technologies for patterning or engraving a surface are known. Among those available, the following ones are worth mentioning:standard technologies for liquid crystal display such as photolithography, laser engraving, chip on glass mounting and soldering for active components soldering on substrate; andelectronic printing technologies such as aerosol printing, ink projection.
In ink projection, the ink may comprise a graphene based conductor or is a silver ink for printing silver nanowires acting like ITO (Indium Tin Oxyde).

The invention also provides an ophthalmic lens or ophthalmic lens blank5comprising the MF device1described above. The MF device1may cover all or only part of the ophthalmic lens or ophthalmic lens blank5. When it covers the entire ophthalmic lens or ophthalmic lens blank5, the support layer is preferably the ophthalmic substrate itself. The side edge of the support layer2may be flush with the side edge of the ophthalmic lens or ophthalmic lens blank5.

The invention also provides a spectacle comprising at least one ophthalmic lens described above.

The invention further provides a method for manufacturing a MF device described above. The method comprises:providing an ECL module onto an EC part of one face of the support layer;providing an OPL module onto an OP part of one face of the support layer.

Providing an ECL module may comprise providing a CTC layer directly on and in contact with the EC part. The step may further comprise a LC layer directly on and in contact with the CTC layer, a second CTC layer directly on and in contact with the LC layer, and a protective layer directly on and in contact with the second CTC layer.

Providing an OPL module may comprise patterning the support layer with a transparent conductive layer comprising TC strips oriented in a first direction directly in contact with the part of the corresponding face of the support layer. Providing an OPL module may further comprise providing a second TC layer comprising TC strips oriented in a second direction perpendicular to the first direction, a LC layer directly between and in contact with both TC layers comprising TC strips, the LC layer also filling the space between the strips, and a protective layer directly on and in contact with the second TC layer comprising TC strips.

EXAMPLES

In Example 1, the MF device comprises a support layer, an ECL module on one face of the support layer and an OPL module which is an EFL module, on another face of the support layer opposite to the one face, the support layer being an intermediate support layer.

The ECL module, apart from the one face of the support layer, further comprises a CTC layer, for example ITO, over the entire one face of the support layer and directly contacting the one face and acting as a first electrode. The ECL module also comprises a LC layer directly contacting the CTC layer and entirely covering it, and a protective layer, preferably made of the same material as the support layer, contacting the LC layer and entirely covering it.

The ECL module further comprises a second electrode which may be a CTC layer or a TC layer comprising TC strips.

The ECL module preferably comprises a light sensor.

The EFL module, apart from the other face of the support layer, further comprises a transparent conductive layer comprising a plurality of transparent conductive strips, such as ITO strips or silver nanostrips, the strips being parallel to one another along a given direction. The EFL module also comprises a LC layer entirely covering the transparent conductive layer, directly contacting it, and filing the gaps between the transparent conductive strips. The EFL module further comprises a protective layer, preferably made of the same material as the support layer, contacting the LC layer and entirely covering it.

Last, a controller is connected by wires and/or connectors to the active parts (ECL and EFL modules), or embedded partially or completely on the glass (for example the battery can be separated and connected through wires). This controller contains a battery or energy source, like supercapacitor, a processor and connection means to the ECL and EFL modules. Processor can be a display controller, a general purpose processor, a FPGA (Field Programmable Gate Array) or a custom designed application-specific integrated circuit (ASIC).

In Example 2, the MF device comprises a support layer, an ECL module on one face of the support layer and an OPL module on another face of the support layer opposite to the one face.

In this example, the OPL module provides the backlight function. Thus, no supplementary back light module is needed. The ECL module provides the liquid crystal function.

The OPL module, apart from the other face of the support layer, comprises a plurality of OLEDs printed on the other face of the intermediate support and homogeneously scattered through the surface thereof.

The ECL module, apart from the one face of the support layer, comprises a TC layer comprising a plurality of TC strips, such as ITO strips or silver nanostrips, the strips being parallel to one another along a first given direction. The ECL module further comprises another TC layer comprising a plurality of TC strips, such as ITO strips or silver nanostrips, the strips being parallel to one another along a second given direction intersecting the first given direction, preferably perpendicularly.

Last, a controller as described in Example 1 is provided.

Example 3—Light Therapy

In Example 3, the MF device may be used for light therapy. It comprises a support layer, an ECL module on one face of the support layer and an OPL module on another face of the support layer opposite to the one face.

The ECL module is the same as in Example 1 but without light sensor.

The OPL module, apart from the other face of the support layer, further comprises a plurality of micro-sized blue micro LEDs on the other face of the intermediate support and homogeneously scattered through the surface thereof. The micro LEDs have a size of about 10 μm and as such they are almost if not entirely invisible to the wearer.

This MF device preferably forms a multifunctional ophthalmic lens that provides not only blue light therapy but also reduces the light entering the wearer's eye when sunlight is strong or in the evening when the amount of blue light entering the wearer's eye must be reduced or even avoided to facilitate melatonin synthesis for easy sleep.

A controller as described in Example 1 is provided.

In order to improve functionality of the MF device, a light sensor may be provided to better regulate the level of light provided by the MF device according to external light and/or time of the day, for example to provide a chronobiology cycle regulation.

Example 4—OLED Display

In Example 4, the MF device comprises a support layer, an ECL module on one face of the support layer and an OPL module on another face of the support layer opposite to the one face.

The ECL module is the same as in Example 1.

The OPL module, apart from the other face of the support layer, further comprises a transparent OLED display.

OLED display can be printed directly on the plastic substrate, or on glass substrate. Micro Led display can be produced with more complex means that are at the moment under development.

The support layer comprises a processor, preferably soldered on its side edge. The processor is connected to the light sensor and controls the ECL module to tune its darkening based on the signal of the light sensor, which is indicative of the lighting conditions, so that the ECL module is activated on when the light sensor detect a high level of light, in order to enhance the display contrast.

A controller as described in Example 1 is provided to address each pixel of the display and control the ECL module.

Example 4bis—Holographic Mirror Display

In this example, all elements are the same as in Example 4 but the OPL module is a holographic mirror.

Example 4ter—Spatial Light Modulator Display

In this example, all elements are the same as in Example 4 but the OPL module is a spatial light modulator.

In Example 5, the MF device1comprises an ophthalmic lens or ophthalmic lens blank5, an ECL module3and an OPL module4. A first support layer2is in contact with the front face of the ophthalmic lens or ophthalmic lens blank5on one of its face. An ECF layer32is in contact with the other face of the first support layer2and an OPF layer42with the same other face of the first support layer2so that the first support layer2forms one end layer31,41of each of the ECL module3and OPL module4. A second support layer2′ is in contact with the ECF layer32and the OPF layer42forming the other end layer33,43of each of the ECL module3and OPL module4. A separator6formed by optical glue is placed between the ECF layer32and the OPF layer42. Further amount of optical glue is used to completely seal the function layers32,42from the external environment.

In this example 5, the ECL module3covers the entire upper part of the ophthalmic lens or ophthalmic lens blank5and the OPL module4covers the entire lower part thereof.

The separation between both modules3,4is substantially horizontal when considering the ophthalmic lens or ophthalmic lens blank5in their normal wearing position. The height of the upper part forms 50 to 65% of the height of the ophthalmic lens or ophthalmic lens blank, the rest being the lower part.

Alternatively, in an example not illustrated, the first support layer2and the ophthalmic lens or ophthalmic lens blank5are together a unique block of material.

In Example 6, the MF device1has the same structure than that of example 5, except the following.

The OPF layer42is surrounded by the ECF layer32so that the OPL module4is surrounded by the ECL module3.

The OPL module4covers a portion of the lower part of the ophthalmic lens or ophthalmic lens blank5leaving a strip of ECL module3at the lowest part thereof. The OPL module4has typically the shape of the smaller and lower lens of a bifocal ophthalmic lens with necessarily having the same function.

Alternatively, in an example not illustrated, the first support layer2and the ophthalmic lens or ophthalmic lens blank are together a unique block of material.

In Example 7, the MF device1comprises an ophthalmic lens or ophthalmic lens blank5, ECL module3and an OPL module4. The ophthalmic lens or ophthalmic lens blank5presents at its front face a recess51.

A intermediate support layer2is in contact fully on one of its faces with an ECF layer32(here front face). A portion of its other face (here back face) presents an excess of thickness22in contact with an OPF layer42. The ECF layer32is further in contact with a second support layer33opposite to the intermediate support layer2and which covers it entirely. The OPF layer42is also in contact with a third support layer43that covers it entirely.

The intermediate support layer2, the ECF layer32and the second support layer33form the ECL module3.

The excess of thickness22, the OPF layer42and the third support layer43form the OPL module4.

The thickness of OPL module4is equal to the depth of the recess51on the front face of the ophthalmic lens or ophthalmic lens blank5so that the recess can house the OPL module4and at the same time the front face of the ophthalmic lens or ophthalmic lens blank5is in contact with the intermediate support layer2.

Thus, the OPL module4overlaps over its entire surface the ECL module3.

Alternatively, in an example not illustrated, the third support layer43and the ophthalmic lens or ophthalmic lens blank5are together a unique block of material.

Alternatively still, in an example not illustrated, the intermediate support layer2, the third support layer43and the ophthalmic lens or ophthalmic lens blank5are together a unique block of material. In this latter example, the OCL module4is entirely embedded in the ophthalmic lens or ophthalmic lens blank5.

In example 8, the MF device1comprises an ophthalmic lens or ophthalmic lens blank5, ECL module3and an OPL module4.

An intermediate support layer2is in contact fully on one of its faces with an ECF layer32(here back face). The other face (here front face) of the intermediate support layer2presents a recess21over a portion thereof. An OPF layer42is in contact with the surface of the recess21and covers it entirely.

The ECF layer32is further in contact with a second support layer33opposite to the intermediate support layer2and which covers it entirely thus forming an ECL module3. The OPF layer42is also in contact with a third support layer43that covers it entirely thus forming an OPL module4.

The added thickness of the OPF layer42and third support layer43equals to the depth of the recess21of the intermediate support layer2.

The second support layer33is attached to the front face of the ophthalmic lens or ophthalmic lens blank5, e.g. with optical glue.

Alternatively, the third support layer43and the intermediate support layer2are together a unique block of material. In this latter example, the OCL module4is entirely embedded in the intermediate support layer.

Any ECL module of the examples 1 to 8 may be combined with any of the OPL module of the examples 1 to 4, depending on the desired effect.