Method for designing contact lens

Abstract

A computer-implemented method for designing a contact lens, the method comprising:-for a first region of the contact lens, a second region of the contact lens, determining, for a first region of the contact lens, a value of at least one optical characteristic of at least one micro-optical element superimposed on the contact lens in the first region, based on a first comparison between a first optical function of the contact lens calculated in the entire first region of the contact lens and a first target optical function,-determining, for a second region of the contact lens, a value of at least one optical characteristic of at least one micro-optical element superimposed on the contact lens in the first region; determining a value of at least one optical characteristic of at least one micro-optical element superimposed on the contact lens in a second region on the basis of a second comparison between a second lens optical function of the contact lens calculated in the entire second region of the contact lens and a second target optical function, the second region is included in a complex of the first region and the second region.

Description

Technical Field

[0001] The present invention relates to a method for designing a contact lens. Background Art

[0002] Myopia of the eye is characterized in that the eye focuses light from a distance in front of the retina. In other words, the length presented by a myopic eye is too long for clear distant vision. Myopia has both genetic and environmental causes. In the latter case, myopia develops due to an increase in near vision tasks and a decrease in outdoor activities.

[0003] There are many solutions aimed at alleviating the discomfort caused by myopia and / or controlling the evolution of myopia. In particular, it is known to use an ophthalmic lens which is intended to be worn in front of the wearer's eye and which has an optical device zone including an arrangement of micro-optical elements having optical characteristics adapted to alleviate the discomfort caused by myopia and / or to provide a myopia control function in order to manage myopia progression. These solutions can be practical, but in the design process, the influence of the light environment on the change in the pupil size of the wearer is not considered, especially when the wearer is engaged in indoor or outdoor activities. Thus, when applied to contact lenses, the design of these lenses is not well adapted to changes in the light environment. The fact that the light environment is not considered in the design process of these contact lenses can change the visual acuity of the wearer wearing these contact lenses. Summary of the Invention

[0004] In this context, an object of the present invention is to provide a method for designing a corrective contact lens which, due to its optical characteristics, provides a better compromise for the wearer between visual acuity and visual discomfort in terms of myopia evolution control.

[0005] According to the present invention, the above object is achieved by providing a computer-implemented method for designing a contact lens intended to be worn on the eye of a wearer, the computer-implemented method comprising:

[0006] - for a first zone of the contact lens, determining, based on a first comparison, a value of at least one optical characteristic of at least one micro-optical element superimposed on the contact lens in the first zone, the first comparison being between a first optical function, calculated over the entire first region of the contact lens and representing the optical quality of the contact lens, and a first target optical function, the first region including the first zone and including at least one micro-optical element of the first zone,

[0007] - For a second zone of the contact lens, determine a value of at least one optical characteristic of at least one micro-optical element superimposed on the contact lens in the second zone based on a second comparison between a second optical function, which is calculated over the entire second zone of the contact lens and represents the optical quality of the contact lens, and a second target optical function, the second zone being included in the union of the first zone and the second zone and including at least one micro-optical element of the second zone.

[0008] - Provide a final lens design of the contact lens based on the values of at least one optical characteristic of the micro-optical elements determined for the first zone and for the second zone, the final lens design corresponding to the optical design of the contact lens intended to be worn by the wearer.

[0009] Due to the use of specific zones and the calculations on these zones, the method allows for the consideration of changes in pupil size caused by changes in the light environment during the design process of the contact lens. The contact lens obtained with this method adapts well to changes in the light environment and thus presents a better compromise for the wearer between visual acuity and myopia control efficacy (e.g., visual discomfort caused by the control of myopia progression achieved by the micro-optical elements).

[0010] Therefore, the method provides a contact lens having an optical lens design determined by taking into account changes in pupil diameter.

[0011] According to an embodiment, the contact lens intended to be worn by the wearer is a corrective contact lens.

[0012] According to an embodiment, the second zone is arranged to surround the first zone.

[0013] According to an embodiment, determining the value of at least one optical characteristic of at least one micro-optical element of the first zone is performed before determining the value of at least one optical characteristic of at least one micro-optical element of the second zone.

[0014] According to a last embodiment, the method further comprises:

[0015] - For a third zone of the contact lens that is annularly arranged to surround the second zone, determine a value of at least one optical characteristic of at least one micro-optical element superimposed on the contact lens in the third zone based on a third comparison between a third optical function of the contact lens, which is calculated over the entire third zone of the contact lens, and a third target optical function, the third zone being included in the union of the first zone, second zone, and third zone and including at least one micro-optical element of the third zone, the final lens design of the contact lens further being based on the value of at least one optical characteristic of the micro-optical elements determined for the third zone.

[0016] Determining the value of at least one optical characteristic of at least one micro-optical element in the third zone is performed after determining the value of at least one optical characteristic of at least one micro-optical element in the second zone.

[0017] Advantageously, the first zone of the contact lens, the second zone of the contact lens, and the third zone of the contact lens are concentric.

[0018] According to an embodiment, the first optical function, the second optical function, the first target optical function, and / or the second target optical function are based on a modulation transfer function or a point spread function.

[0019] According to an embodiment, the first target optical function and the second target optical function are the same.

[0020] According to an embodiment, the first target optical function and the second target optical function are different.

[0021] According to an embodiment, the first optical function and / or the second optical function are calculated for spatial frequencies between 1 and 5 cycles per degree, and / or between 5 and 20 cycles per degree and / or between 20 and 30 cycles per degree.

[0022] According to an embodiment, at least one optical characteristic of at least one micro-optical element in the first zone and at least one optical characteristic of at least one micro-optical element in the second zone include at least one of the following:

[0023] - Diopter;

[0024] - Geometry;

[0025] - Refractive optical function, diffractive optical function, or diffusive optical function;

[0026] - Focal length;

[0027] - Diameter;

[0028] - Position.

[0029] Advantageously, at least one micro-optical element in the first zone has a circular profile, the diameter of at least one micro-optical element in the first zone is between 0.3 mm and 2 mm, and / or at least one micro-optical element in the second zone has a circular profile, the diameter of at least one micro-optical element in the second zone is between 0.3 mm and 2 mm.

[0030] Advantageously, the diopter of at least one micro-optical element in the first zone is between 1 diopter and 10 diopters, and / or the diopter of at least one micro-optical element in the second zone is between 1 diopter and 10 diopters.

[0031] According to an embodiment, the first region includes a plurality of micro-optical elements, and at least one optical characteristic of the first region includes the density of the micro-optical elements on the first region or the number of the micro-optical elements in the first region, and / or

[0032] the second region includes a plurality of micro-optical elements, and at least one optical characteristic of the second region includes the density of the micro-optical elements on the second region or the number of the micro-optical elements in the second region.

[0033] According to an embodiment, the first region includes at least one sub-region without any micro-optical elements, at least one sub-region of the first region covers at least 10% of the first region, and / or the second region includes at least one sub-region without any micro-optical elements, at least one sub-region of the second region covers at least 10% of the second region.

[0034] According to an embodiment, determining the value of at least one optical characteristic of at least one micro-optical element in the first region and the second region each includes an iterative optimization process, and the iterative optimization process includes:

[0035] - Modifying at least one optical characteristic of at least one micro-optical element,

[0036] - Checking whether a given comparison satisfies a criterion,

[0037] - If the criterion is not satisfied, repeating the modification and checking.

[0038] According to an embodiment, the criterion is at least one of the following:

[0039] - The minimum value of the quadratic deviation between a first optical function and a first target function,

[0040] - The minimum value of the quadratic deviation between a second optical function and a second target function,

[0041] - The minimum value of a specific cost function,

[0042] - The value ranges of a first target optical function and a second target optical function,

[0043] - A threshold.

[0044] Typically, the iterative optimization process includes a stopping criterion corresponding to the number of iterations in addition to the criterion, and the stopping criterion is configured to stop the iterative optimization process when the current iteration reaches the number of iterations.

[0045] According to an embodiment, the method includes a preliminary step of defining a macroscopic optical design of a contact lens, and the macroscopic optical design provides a macroscopic optical function having at least a spherical refractive power. Detailed Description

[0046] The following description with reference to the accompanying drawings will make clear what is included in the present invention and how the present invention can be implemented. The present invention is not limited to the embodiments shown in the drawings. Accordingly, it should be understood that where a feature mentioned in a claim is followed by a reference sign, the inclusion of such reference sign is for the sole purpose of enhancing the intelligibility of the claim and in no way limits the scope of the claim.

[0047] In the drawings:

[0048] - Figure 1 There is shown an example of a contact lens according to the present disclosure placed on the eye of a wearer.

[0049] - Figure 2 There is shown a schematic axial cross-sectional view of a contact lens according to the present disclosure;

[0050] - Figure 3 There is shown a front view of a first example of a contact lens according to the present disclosure when projected onto a facial plane perpendicular to the major axis of the contact lens;

[0051] - Figure 4 There is shown a schematic front view of a second example of a contact lens according to the present disclosure when projected onto a facial plane perpendicular to the major axis of the contact lens;

[0052] - Figure 5 There is shown Figure 4 a schematic front view of an example of the arrangement of micro-optical elements in a second zone of a third example of the contact lens shown;

[0053] - Figure 6 There is shown Figure 4 a schematic front view of another example of the arrangement of micro-optical elements in a second zone of a third example of the contact lens shown;

[0054] - Figure 7 There is shown a schematic front view of a third example of a contact lens according to the present disclosure when projected onto a facial plane perpendicular to the major axis of the contact lens;

[0055] - Figure 8 There is shown a schematic front view of a fourth example of a contact lens according to the present disclosure when projected onto a facial plane perpendicular to the major axis of the contact lens;

[0056] - Figure 9 There is shown a schematic front view of a fifth example of a contact lens according to the present disclosure when projected onto a facial plane perpendicular to the major axis of the contact lens;

[0057] - Figure 10shows a schematic front view of a sixth example of a contact lens according to the present disclosure when projected into a facial plane perpendicular to the major axis of the contact lens;

[0058] - Figure 11 shows a schematic front view of a seventh example of a contact lens according to the present disclosure when projected into a facial plane perpendicular to the major axis of the contact lens;

[0059] - Figure 12 is a diagram illustrating a first embodiment of a method according to the present disclosure;

[0060] - Figure 13 is a diagram illustrating a second embodiment of a method according to the present disclosure;

[0061] - Figure 14 A graphical representation showing an example of a target optical function according to the present disclosure is shown;

[0062] - Figure 15 Shown Figure 11 graphical representations of examples of first, second, and third optical functions obtained with the lens design shown;

[0063] - Figure 16 Shown using Figure 10 The lens design and Figure 11 Graphical representation of two examples of the third optical function obtained for the lens designs shown.

[0064] Throughout this disclosure, including the claims, the verb "to comprise" should be construed in its inclusive sense.

[0065] like Figure 1 As shown, the contact lens 10 is intended to be positioned on an eye E of a wearer, such as the left or right eye of the wearer.

[0066] The wearer may wear another contact lens on his other eye. The other contact lens has a design that is preferably similar to the design of contact lens 10 and defined according to the present disclosure.

[0067] like Figure 1 and Figure 2 As shown, the contact lens 10 presents a general shape of revolution about a main visual axis A passing through the center or vertex V of the convex front face 11. The contact lens 10 has a concave rear face 12 which is intended to come into contact with the cornea CO of the eye E.

[0068] The contact lens 10 has an optical design that includes macroscopic and microscopic optics.

[0069] The macro-optical components of an optical design (or "macro-optical design") provide a macro-optical function that provides at least one overall refractive power over most or all of the effective radial width of a contact lens in order to provide refractive correction for a wearer's eye that is suitable for the wearer's refractive correction needs under the wearing conditions. For example, the macro-optical function is provided by the geometry of the front surface 11 or the rear surface 12 or both surfaces, typically by adapting the radius of curvature of one or both surfaces of the lens. The refractive power of the contact lens can, for example, be between -20 diopters and +20 diopters, typically between -10 diopters and +10 diopters.

[0070] According to the wearer's correction needs determined by an eye care professional to correct the vision defect of a wearer (or subject or individual), the refractive power provided by the macro-optical design includes at least a spherical power and may also include a cylindrical power and a prism deviation. For example, the prescription for a refractive error wearer includes a dioptric value and an astigmatic value, and these astigmatic values include a cylinder and an axis for distance and / or near vision.

[0071] Therefore, the contact lens 10 can be a corrective contact lens.

[0072] The wearing conditions should be understood as the position of the contact lens on the wearer's eye. The wearing conditions are achieved when the contact lens is positioned on the cornea CO of the wearer's eye E and when the vertex V of the ophthalmic contact lens is aligned in front of the center of the pupil PU of the wearer's eye. The center of the pupil PU of the eye is aligned on the principal visual axis A of the contact lens.

[0073] The micro-optical components of the optical design (or "micro-optical design") of the contact lens consist of a number of micro-optical elements 13, 14 arranged on at least one of the front and rear surfaces of the lens (preferably the convex front surface).

[0074] Each micro-optical element has its own optical function and has a small size of less than 2 mm, preferably less than 1 mm. Each micro-optical element includes, for example, a microlens, a Pi Fresnel lens, a prism, a diffuser, a beam splitter, or a diffraction grating. The micro-optical elements are typically formed by lithography, holography, molding, machining, or encapsulation. In Figure 2 , the micro-optical element is a microlens and thus has a circular profile.

[0075] This arrangement of micro-optical elements provides a micro-optical function different from and complementary to the macro-optical function. Thus, the global optical function of the contact lens is the addition of its macro-optical function and its micro-optical function provided respectively by the macro-optical components and the micro-optical components of its optical design. The micro-optical function of the contact lens is the optical function provided by a contact lens without a macro-optical design (i.e., without any overall refractive power over most or all of the effective radial width of the contact lens). The macro-optical function of the contact lens is the optical function provided by a contact lens without a macro-optical design (i.e., without any micro-optical elements).

[0076] In Figure 2 the example shown, the micro-optical element 13 is located on the front surface 11 of the contact lens 10.

[0077] Alternatively, at least a part or all of the micro-optical elements 13 are located on the rear surface 12 of the contact lens 10.

[0078] Yet alternatively, at least a part or all of the micro-optical elements 13 are located between the front surface 11 and the rear surface 12 of the contact lens 10.

[0079] Yet alternatively, at least a part or all of the micro-optical elements 13 are formed on a film in the form of patches deposited on at least one of the front surface 11 and the rear surface 12 of the contact lens 10.

[0080] In a variant, at least a part or all of the micro-optical elements 13 are formed by laminating on at least one of the front surface 11 and the rear surface 12 of the contact lens 10.

[0081] As Figures 3 to 4 to Figures 7 to 11 shown, the contact lens includes at least two different zones, and the micro-optical elements are specifically arranged in the at least two different zones, and the micro-optical elements in one of the two different zones can be arranged differently from the micro-optical elements in the other of the two different zones. The term "zone" is relative to a part of the contact lens. These zones are shown or defined in the same projection plane perpendicular to the main axis A of the contact lens. Thus, when comparing one zone of the contact lens with another zone of the contact lens, the two zones are shown or defined in the same projection plane without considering the curvature of the contact lens.

[0082] Each of these zones of the contact lens includes an arrangement of a number of micro-optical elements.

[0083] Figure 12 A first example of a method 100 according to the present disclosure is shown. The method 100 is a method for designing the contact lenses 10, 30, 40, 50, 60 as Figures 3 to 9 shown.

[0084] Method 100 first includes step 110 of defining a preliminary lens optical design of the corrective contact lenses 10, 30, 40, 50, 60.

[0085] Method 100 further includes steps 120, 130 of determining values of at least one optical characteristic of the micro-optical elements 13 superimposed on the contact lenses 10, 30, 40, 50, 60 for different zones of the contact lenses.

[0086] Method 100 further includes step 140 of providing a final lens design of the contact lenses 10, 30, 40, 50, 60.

[0087] Then, the contact lenses are manufactured according to the final optical design.

[0088] This method is implemented by a computer. The computer can be a processor, a computing module, or a calculator or a computing unit. Typically, the computer includes a processor, a memory, and different input and output interfaces. The defining step 110, the determining step 120, the determining step 130, the providing step 140 (and Figure 13 the determining step 210) are implemented by a single computing module, or each of them is implemented by separate computing modules communicating with each other through a direct link or a network link.

[0089] In the defining step 110, the preliminary lens optical design is adapted to provide the above-described macroscopic optical functions of the contact lenses 10, 30, 40, 50, 60 having a prescription refractive power. For example, the preliminary lens optical design includes the geometry of the front or back or both surfaces, typically the radius of curvature of one or both surfaces.

[0090] The preliminary lens optical design may further include:

[0091] - the positions and sizes of different zones of the contact lens,

[0092] - the optical design of the micro-optical elements included in each zone,

[0093] - the initial quantity of the micro-optical elements in each zone,

[0094] - the initial values of one or several optical characteristics of the micro-optical elements in each zone selected from the following:

[0095] - diopter;

[0096] - geometry, i.e., the shape of the surface of the micro-optical element;

[0097] - refractive optical function, diffractive optical function, or diffusive optical function;

[0098] - focal length;

[0099] - Diameter or size;

[0100] - Position.

[0101] In Figure 3 In the non - limiting example shown, the contact lens 10 is divided into two zones: a central disc - shaped first zone 15 and an annular disc - shaped second zone 16.

[0102] In the defining step 110, the sizes of the first and second zones are defined.

[0103] In Figure 3 In the example shown, the first zone 15 starts from the ophthalmic lens optical vertex V of the contact lens 10 and is bounded by a circular contour 17. The first zone 15 may include at least one sub - zone 18 bounded by a circular contour 19. This sub - zone 18 lacks micro - optical elements and covers at least 10% of the first zone 15. For example, the sub - zone 18 has a diameter of 2 millimeters and is centered on the ophthalmic lens optical vertex V of the contact lens 10. This feature allows maintaining the wearer's visual acuity, typically when the wearer's pupil is a small pupil obtained under high - light conditions (i.e., outdoor conditions when myopia control by the microlenses is not required).

[0104] The first zone 15 and the second zone 16 are concentric. The second zone 16 may also be centered on the ophthalmic lens optical vertex V10 of the contact lens 10. The second zone 16 surrounds the first zone 15 and is bounded internally by the circular contour 17 of the first zone 15 and externally by a circular outer contour that coincides with the outer edge 20 of the contact lens 10.

[0105] In the non - limiting example, the circular outer contour 17 of the first zone 15 has a diameter between 2.00 millimeters and 5 millimeters (e.g., including any value between 2.00 millimeters and 5.00 millimeters, especially any of the following values: 2.00, 2.10, 2.20, 2.30, 2.40, 2.50, 2.60, 2.70, 2.80, 2.90, 3.00, 3.10, 3.20, 3.30, 3.40, 3.50, 3.60, 3.70, 3.80, 3.90, 4.00, 4.10, 4.20, 4.30, 4.40, 4.50, 4.60, 4.70, 4.80, 4.90, 5.00), preferably between 2 millimeters and 4 millimeters.

[0106] Preferably, the circular inner contour of the second zone 16 has a diameter between 2.00 mm and 5 mm (e.g., including any value between 2.00 mm and 5.00 mm, such as any of the following values: 2.00, 2.10, 2.20, 2.30, 2.40, 2.50, 2.60, 2.70, 2.80, 2.90, 3.00, 3.10, 3.20, 3.30, 3.40, 3.50, 3.60, 3.70, 3.80, 3.90, 4.00, 4.10, 4.20, 4.30, 4.40, 4.50, 4.60, 4.70, 4.80, 4.90, 5.00), preferably between 2 and 4 mm. Preferably, the outer contour of the second zone 16 (i.e., the outer edge 20) has a diameter between 4.00 mm and 10 mm (e.g., including any value between 4.00 mm and 10.00 mm, such as any of the following values: 4.00, 4.10, 4.20, 4.30, 4.40, 4.50, 4.60, 4.70, 4.80, 4.90, 5.00, 5.10, 5.20, 5.30, 5.40, 5.50, 5.60, 5.70, 5.80, 5.90, 6.00, 6.10, 6.20, 6.30, 6.40, 6.50, 6.60, 6.70, 6.80, 6.90, 7.00, 7.10, 7.20, 7.30, 7.40, 7.50, 7.60, 7.70, 7.80, 7.90, 8.00, 8.10, 8.20, 8.30, 8.40, 8.50, 8.60, 8.70, 8.80, 8.90, 9.00, 9.10, 9.20, 9.30, 9.40, 9.50, 9.60, 9.70, 9.80, 9.90, 10.00), preferably between 4.00 mm and 8 mm.

[0107] The contact lens 10 has a first region and a second region. The first region is included in the first zone 15 and includes some or all of the micro-optical elements 13 in the first zone (in this example, all of the micro-optical elements 13 in the first zone 15). In this example, the first region of the contact lens 10 is bounded by an outer contour which coincides here with the contour 17 defining the first zone 15. This means that the first region also includes a sub-region 18 without micro-optical elements. The second region is included in the union of the first zone 15 and the second zone 16 and includes some or all of the micro-optical elements 14 in the second zone 16 (here all of the micro-optical elements 14 in the second zone 16). The second region of the contact lens 10 also includes the micro-optical elements 13 of the first zone 15. This means that the second region of the contact lens 10 overlaps with the first zone 15 and the second zone 16. In this example, the second region includes the entire contact lens 10.

[0108] In a non-limiting example, the outer contour of the second zone 16 (and thus the outer edge 20 of the contact lens 10) presents a diameter of 10.00 mm. The contour 17 that is the inner contour of the second zone 16 and the outer contour of the first zone 15 presents a diameter of 4.00 mm.

[0109] Defining the first zone 15 and the second zone 16 with different sizes allows for variations in the pupil size of the wearer's eye E to be taken into account. Thus, the method 100 provides a corrective lens having an optical lens design determined by taking into account variations in the pupil diameter. The method 100 provides a better compromise for the corrective contact lens 10 between visual acuity and myopia control efficacy (e.g., visual discomfort caused by the control of myopia progression achieved by the micro-optical elements).

[0110] The second zone 16 includes a sub-zone 21 that lacks micro-optical elements and covers at least 10% of the second zone 16. For example, the sub-zone 21 has an annular disk shape, where the inner contour presents a diameter of 4 mm and the outer contour 22 presents a diameter of 6 mm. In this example, the sub-zone 21 of the second zone 16 is centered on the vertex V of the contact lens 10. This feature allows the visual acuity of the wearer in the second zone 12 to be maintained. By Figure 3 the sub-zone 21 shown, the micro-optical elements 13 of the first zone do not contact the micro-optical elements of the second zone 16.

[0111] The diameter d 15 of the micro-optical elements 13 of the first zone 15 is fixed between 0.3 mm and 2 mm when projected onto the facial plane (perpendicular to the main axis of the contact lens) (e.g., including any value between 0.3 mm and 2.0 mm, such as any of the following values: 0.30, 0.40, 0.50, 0.60, 0.70, 0.80, 0.90, 1.00, 1.10, 1.20, 1.30, 1.40, 1.50, 1.60, 1.70, 1.80, 1.90, 2.00). The diameter d 16The size is fixed between 0.3 mm and 2 mm when projected onto a plane (e.g., including any value between 0.3 mm and 2.0 mm, such as any of the following values: 0.30, 0.40, 0.50, 0.60, 0.70, 0.80, 0.90, 1.00, 1.10, 1.20, 1.30, 1.40, 1.50, 1.60, 1.70, 1.80, 1.90, 2.00). The diameter of the micro-optical element can depend on the type of micro-optical element (refractive single-focus or bifocal, spherical or aspherical or toric, diffractive or Pi Fresnel). Examples of the determination of the diameter can be found in European application reference document EP 3923061 A1, PCT application reference document WO 2021 / 198362, PCT application reference document WO 2019 / 206569 A1, and PCT application reference document WO 2019166653A1.

[0112] The micro-optical element 13 in the first zone 15 can be configured to have a spherical power between 1 diopter and 20 diopters, preferably between 1 diopter and 10 diopters, and the micro-optical element 14 in the second zone 16 is configured to have a spherical power between 1 diopter and 20 diopters, preferably between 1 diopter and 10 diopters.

[0113] The micro-optical element 13 in the first zone 15 is defined to have a surface shape, such as a rhombic surface shape or a spherical surface shape or an aspherical surface shape or a toric surface shape, and the micro-optical element 14 in the second zone 16 is defined to have a surface shape, such as a rhombic surface shape or a spherical surface shape or an aspherical surface shape or a toric surface shape.

[0114] Each refractive micro-optical element 13, 14 can be a single-focus micro-optical element or a bifocal micro-optical element.

[0115] Each diffractive micro-optical element 13, 14 includes, for example, a diffractive Pi Fresnel microlens. The diffractive Pi Fresnel microlens has a phase function that exhibits a π phase jump at the nominal wavelength λ0. For human eye vision applications, the wavelength λ0 is preferably 550 nm. The diffractive Pi Fresnel microlens presents an optical axis passing through the optical center of the microlens. The microlens with a diffractive Pi Fresnel micro-optical element diffracts mainly at two diffraction orders associated with two diopters P0(λ0) and P1(λ0). Thus, when receiving collimated light, the microlens focuses the light on two different regions on its axis.

[0116] For example, the diopter P0(λ0) is included within the range of the spherical power of the predetermined refractive power of the contact lens 10 plus / minus 0.12 diopters, and the spherical power, for example, is derived from the prescription of the wearer.

[0117] According to an embodiment, the absolute value of the diopter P1(λ0) is between 1 diopter (i.e., ±1 diopter) and 10 diopters (i.e., ±10 diopters). Preferably, the diopter P1(λ0) is between ±2 diopters and ±6 diopters.

[0118] As an alternative, each diffractive micro-optical element 13, 14 includes a diffusive micro-optical element that scatters light. For example, collimated light is scattered in a cone with an apex angle range of + / -1° to + / -40°. In an example, the diffusive micro-optical element is adapted to scatter light locally, i.e., at the intersection between a given micro-optical element and the wavefront arriving at the given micro-optical element. The micro-optical element having a diffusive optical function can be similar to the micro-optical element described in document US10302962.

[0119] In addition, the position of the micro-optical elements in each zone is defined by three-dimensional spatial coordinates (x, y, z) defined according to three spatial axes. The first and second spatial axes (x, y) are included in the projection face plane (perpendicular to the main axis of the contact lens) and define the position on the field of view passing through the contact lens. The third spatial axis z coincides with the main visual axis A of the contact lens and gives the position along this axis (in other words, it relates to the distance from the eye). The three-dimensional spatial coordinate system (x, y, z) has an origin O located at the ophthalmic vertex V in front of the contact lens. The values of the three-dimensional spatial coordinates (x, y, z) of each micro-optical element allow defining the positioning position of the micro-optical element in the field of view of the contact lens and whether the micro-optical element is positioned on the front or back of the contact lens or embedded in the thickness of the contact lens. Generally, the micro-optical elements are located on the back of the contact lens, on the front of the contact lens, or in the depth of the contact lens.

[0120] When defining a number of micro-optical elements 13, 14 in the first zone 15 and / or the second zone 16 in the defining step 110, the optical characteristics include the density or number of micro-optical elements. The density of the micro-optical elements on the zone can be defined as the ratio between the total surface of the micro-optical elements and the area of the zone. Thus, in Figure 3In the example shown, in the definition step 110, the density or number of micro-optical elements is set. Preferably, the density is chosen such that the micro-optical elements 13 cover 20% to 80% of the first area 15 (e.g., including any value between 20% and 80%, such as any of the following values: 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80), and correspondingly the density is chosen such that the micro-optical elements 14 cover 20% to 80% of the second area 16 (e.g., including any value between 20% and 80%, such as any of the following values: 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80). For example, in the definition step 110, the first area 15 includes five micro-optical elements 13, and the second area 16 includes twelve micro-optical elements 14. When the first area 15 and / or the second area 16 include a number of micro-optical elements, each optical element in the first area 15 and / or the second area 16 is spaced apart from an adjacent micro-optical element by at least 0.5 mm. Additionally, the first area 15 and / or the second area 16 may be spaced apart from an adjacent micro-optical element by less than 5.0 mm. For example, the edge of one of the micro-optical elements 13, 14 included in the first area 15 or the second area 16 is spaced apart from the edge of an adjacent optical element by 1 mm.

[0121] Some of the micro-optical elements belonging to one area may be in contact with some of the micro-optical elements belonging to another area (see Figure 4 ). Thus, each micro-optical element in the first area 15 is spaced apart from an adjacent micro-optical element belonging to the second area 16 by between 0 and 2 mm (e.g., including any value between 0.00 mm and 2.0 mm, such as any of the following values: 0.00, 0.10, 0.20, 0.30, 0.40, 0.50, 0.60, 0.70, 0.80, 0.90, 1.00, 1.10, 1.20, 1.30, 1.40, 1.50, 1.60, 1.70, 1.80, 1.90, 2.00). The space can be defined edge-to-edge, or by using the optical center (geometric center) or the optical axis of the micro-optical element. When the space between two adjacent micro-optical elements is 0.00 mm, this means that these micro-optical elements are in contact with each other (e.g., adjacent micro-optical elements).

[0122] In a preferred embodiment, the optical characteristics of all the micro-optical elements 13 in the first area 15 respectively have the same value, and the optical characteristics of all the micro-optical elements 14 in the second area 16 respectively have the same value. For example, in the definition step 110, the micro-optical elements 13 in the first area 15 are refractive microlenses with a diameter of 1 mm and a diopter of 4 diopters, and the micro-optical elements 14 in the second area 16 are refractive microlenses with a diameter of 1 mm and a diopter of 4 diopters.

[0123] In another embodiment, each of the micro-optical elements 13 of the first zone 15 has at least one optical characteristic, the value of which varies from one micro-optical element 13 of the first zone 15 to another, and each of the micro-optical elements 14 of the second zone 16 has at least one optical characteristic, the value of which varies from one micro-optical element 14 of the second zone 16 to another. For example, some of the micro-optical elements 14 of the second zone 16 have a spherical diopter of 4 diopters, while other micro-optical elements 14 of the second zone 16 have a spherical diopter of 2 diopters. Each optical characteristic of the micro-optical elements 13, 14 included in the first and second zones is defined in the defining step 110.

[0124] In a non-limiting example, the micro-optical elements 13 of the first zone 15 have optical characteristics adapted to provide a first myopia control function, and the micro-optical elements 14 of the second zone 16 have optical characteristics adapted to provide a second myopia control function for the myopia of the wearer. Typically, each of the first myopia control function and the second myopia control function is achieved by a microscopic optical function provided by the micro-optical elements of a given zone.

[0125] Such an embodiment provides a contact lens 10 that allows simultaneous control of myopia growth and wearer discomfort.

[0126] The first myopia control function depends on the optical characteristics of the micro-optical elements 13 included in the first zone 15, and the second myopia control function depends on the optical characteristics of the micro-optical elements 14 included in the second zone 16. For example, according to the number or density of the micro-optical elements, the diopter, the focal length of the micro-optical elements, the diffusive optical function or the refractive or refractive optical function of the micro-optical elements, the spacing between adjacent micro-optical elements, and so on.

[0127] To this end, when the micro-optical elements 13 of the first zone 15 have a diffractive optical function, these micro-optical elements have optical characteristics adapted to provide a specific defocus spatial distribution, and when the micro-optical elements 14 of the second zone 16 have a diffractive optical function, these micro-optical elements have optical characteristics adapted to provide another defocus spatial distribution different from the defocus spatial distribution provided by the micro-optical elements 13 of the first zone 15. The defocus spatial distribution is also referred to as the defocus effect.

[0128] In a variant, when the micro-optical elements provide a diffusive optical function or a diffractive optical function, the light entering the wearer's eye E is scattered (e.g., unfocused). Due to the first myopia control function and the second myopia control function, the light beam (constituted by light rays) passing through the first zone 15 and the second zone 16 of the contact lens 10 is divided into two parts:

[0129] - The first part corresponds to the light rays that are deviated by the macro-optical component of the contact lens 10 and are not affected by the micro-optical element arrangement in a given zone. Typically, the first part corresponds to the light rays that do not pass through one of the micro-optical elements in the arrangement of the micro-optical elements belonging to the given zone;

[0130] - The second part corresponds to the light rays that are affected by the micro-optical component (i.e., the arrangement of micro-optical elements) and the macro-optical component of the contact lens 10.

[0131] Typically, the second part of the light beam is referred to as the myopia control signal.

[0132] The myopia control signal depends on the characteristics of the micro-optical elements, herein based on a given evolution control function of myopia (the first evolution control function or the second evolution control function of myopia). Typically, the myopia control signal depends on the refractive optical function, the diffractive optical function, or the diffusive optical function of the micro-optical elements. To this end, the myopia control signal is:

[0133] - If the micro-optical element has a diffusive function, it is a diffusive signal. As described above, the diffusive signal corresponds to a non-focusing signal, typically a scattering signal;

[0134] - If the micro-optical element has a diffractive function, it is a diffractive signal. As described above, the diffractive signal corresponds to a non-focusing signal, typically a scattering signal;

[0135] - If the micro-optical element has a diffusive function, it is a refractive signal (defocusing effect).

[0136] Figure 1 The first myopia control signal provided by the micro-optical elements included in the first zone 15 and the second myopia control signal (defocusing effect) provided by the micro-optical elements included in the second zone 16 are shown. The light rays 23 of the first myopia control signal and the light rays 24 of the second myopia control signal entering the wearer's eye E are focused in front of the surface of the retina RE, on a defocus plane DP located in front of the surface of the retina RE. In contrast, the macro-optical function of the contact lens 10 providing the prescribed refractive power for the refractive correction of the eye focuses the light rays entering the eye on the retinal surface of the retina RE of the eye.

[0137] The first myopia control function can be similar to the second myopia control function of myopia. Making the first myopia control function and the second myopia control function the same allows the balance between visual acuity and the performance of myopia control to be the same for different pupil sizes. The first myopia control function of myopia can also be different from the second myopia control function of myopia. This allows a balance to be achieved between visual acuity and the performance of myopia control depending on the size of the pupil.

[0138] In an embodiment, the micro-optical elements 13, 14 include microlenses that provide refractive power. The refractive power of the micro-optical elements 13, 14 (microlenses) is different from the refractive power of the macroscopic optical components of the contact lens 10. In other embodiments, the micro-optical elements 13, 14 may provide a diffractive micro-optical function or a diffusive micro-optical function as described above.

[0139] After defining a preliminary lens optical design of the contact lens 10, the method performs step 120 of determining values of at least one characteristic of the micro-optical element 13 included in the first zone 15. To this end, a first optical function of the contact lens 10 is calculated over the entire first region of the contact lens 10. Then, the first optical function is compared with a first target optical function.

[0140] Similarly, after defining a preliminary lens optical design of the contact lens 10, the method performs step 130 of determining values of at least one characteristic of the micro-optical element 14 included in the second zone 16. To this end, a second optical function of the contact lens 10 is calculated over the entire second region of the contact lens 10. Then, the second optical function is compared with a second target optical function.

[0141] In determination steps 120, 130, different optical characteristics or only one optical characteristic of the micro-optical elements 13, 14 are determined. In the present disclosure, method 100 begins with determining one optical characteristic of the micro-optical element in a given region. Determination steps 120, 130 are performed in sequence. Here, step 120 of determining the value of the optical characteristic of the micro-optical element 13 in the first zone 15 is performed before step 130 of determining the value of the optical characteristic of the micro-optical element 14 in the second zone 16.

[0142] Thus, determination step 130 takes into account the optical characteristics of the micro-optical element determined in the previous step 120. Thus, in step 130, only the optical characteristics of the micro-optical element 14 located in the second zone 16 are determined. This technical feature improves the accuracy of determining the values of the optical characteristics of the micro-optical element and takes into account possible variations in pupil size during design. It provides a way to achieve a compromise between the performance of the myopia control function and the visual accuracy obtained using a contact lens when designed using method 100. Additionally, determination steps 120, 130 are easier to implement and less time-consuming.

[0143] "Optical function" refers to a function that allows quantification of the quality of the optical design of a contact lens as a whole or quantification of a specific region or zone of the optical design of a contact lens.

[0144] Typically, the first optical function and the second optical function, as well as the first target optical function and the second target optical function, are each based on

[0145] - Point spread function, which gives the degree of spread (blur) of the image of a point object throughout the considered region of the contact lens. The point spread function allows the disclosure of the image of a point seen through the contact lens. In the present disclosure, the point spread function is estimated by simulations known to those skilled in the art, using a point source emitting in the monochromatic or polychromatic visible spectrum between 400 nm and 780 nm (λ), typically in the form of an ideal Gaussian (M 2 = 1), centered at the vertex V of the contact lens 10. For each wavelength λ, the point spread function is calculated as the squared magnitude of the inverse Fourier transform of the aperture function P(x,y), which is defined as P(x,y) = A(x,y)exp(ikW(x,y)) located on the preliminary design plane of the contact lens where the micro-optical elements 13, 14 are arranged, where k is the wave number (2π / λ), λ is the wavelength of the point source (preferably equal to 550 nm), A(x,y) is the apodization function (equal to 1), and W(x,y) corresponds to the optical path difference provided by the contact lens.

[0146] - Modulation transfer function, which gives the functional relationship between the percentage of transfer contrast and the spatial frequency (expressed as cycles per degree) throughout the considered region of the contact lens. The use of the modulation transfer function in the method according to the present disclosure will be described in Figures 14 to 16 .

[0147] The modulation transfer function according to the present disclosure can be calculated by spatially scanning the field of view of the contact lens 10 using a simulated aperture that can be defined for several central visual fixation directions in different specific regions of the optical design of the contact lens. Typically, as described above, the point spread function (PSF) is calculated, which gives the degree of spread (blur) of the image of a point object throughout the considered part (defined by the aperture) of the contact lens. Then, the modulation transfer function is calculated based on the Fourier transform of the calculated point spread function.

[0148] For example, the first optical function and the second optical function, and the first target optical function and the second target optical function can be functions defined in the following document: "Accuracy and precision of objective refraction from wavefront aberrations", doi: 10.1167 / 4.4.9.

[0149] According to an example, the first target optical function and the second target optical function are the same target functions within a tolerance of less than 10% for the first region and the second region. This embodiment provides a method that is easier to implement and less time-consuming.

[0150] Additionally, the modulation transfer function according to the present disclosure can be calculated for spatial frequencies between 1 and 30 cycles per degree. In a variant, the modulation transfer function in the present disclosure can be calculated for a specific range of spatial frequencies, for example, between 1 and 5 cycles per degree (e.g., including any value between 1.00 and 5.00 cycles per degree, such as any of the following values: 1.00, 2.00, 3.00, 4.00, 5.00) and / or between 5 and 20 cycles per degree (e.g., including any value between 5.00 and 20.00 cycles per degree, such as any of the following values: 5.00, 6.00, 7.00, 8.00, 9.00, 10.00, 11.00, 12.00, 13.00, 14.00, 15.00, 16.00, 17.00, 18.00, 19.00, 20.00) and / or between 20 and 30 cycles per degree (e.g., including any value between 20.00 and 30.00 cycles per degree, such as any of the following values: 20.00, 21.00, 22.00, 23.00, 24.00, 25.00, 26.00, 27.00, 28.00, 29.00, 30.00). Typically, the selection of a specific range of spatial frequencies allows for the optimization of the optical design of the contact lens for a specific visual task (such as reading activities). Generally, low spatial frequencies (i.e., below 10 cycles per degree) allow the reader to very quickly see words, the rough form of words, and lines, while higher spatial frequencies allow the reader to see the fine details of words (such as the exact form and position of letters), which are used to obtain the meaning of words and sentences.

[0151] In another example, the first target optical function and the second target optical function are different. This embodiment provides for the selection of specific optical features of the micro-optical elements in different zones. This embodiment allows the contact lens to better adapt to different situations, such as indoor or outdoor environments, distance vision activities, or near vision activities. In fact, during near vision activities, the pupil size of the wearer is different from (usually larger than) the pupil size during distance vision activities. Contact lenses designed using this embodiment can contribute to greater efficiency in both situations.

[0152] Optionally, the determining step 120 includes the step of defining a first target optical function, and the determining step 130 includes the step of defining a second target optical function. The first target optical function and the second target optical function can be, for example, modulation transfer functions (MTFs) having predetermined values respectively associated with spatial frequencies. These values are selected depending on the need for visual acuity and the desired level of myopia control. Generally, low spatial frequencies will have an impact on the level of myopia control, while high spatial frequencies will have an impact on visual acuity.

[0153] In Figure 12 method 100 shown, the first optical function, the second optical function, and the first and second target optical functions are modulation transfer functions. Thus, in determination step 120, the computer compares the value of the first modulation transfer function with the value of the first target optical function within at least one spatial frequency range (e.g., for spatial frequencies between 0 and 5 cycles per degree and / or between 10 and 20 cycles per degree and / or between 20 and 30 cycles per degree and / or between 10 and 30 cycles per degree and / or between 0 and 30 cycles per degree) (in the first comparison). Similarly, in determination step 120, the computer compares the value of the second modulation transfer function with the value of the second target optical function within at least one spatial frequency range (e.g., for spatial frequencies between 0 and 5 cycles per degree and / or between 10 and 20 cycles per degree and / or between 20 and 30 cycles per degree and / or between 10 and 30 cycles per degree and / or between 0 and 30 cycles per degree) (in the second comparison). In a preferred embodiment, in determination steps 120, 130, the first and second comparisons are each performed within each spatial frequency between 0 and 5 cycles per degree and within each spatial frequency between 10 and 20 cycles per degree and / or between 10 and 30 cycles per degree and / or between 0 and 30 cycles per degree. The first and second comparisons are preferably performed for spatial frequencies between 0.5 and 5 cycles per degree and / or between 10 and 15 cycles per degree and / or between 20 and 30 cycles per degree because these spatial frequency ranges correspond to the spatial frequencies involved in reading activities.

[0154] According to one embodiment, determination steps 120, 130 of determining the values of the optical characteristics of the micro-optical elements of these regions each include an iterative optimization process that includes the following steps:

[0155] - Modify 121, 131 the optical characteristics of the micro-optical elements 13, 14,

[0156] - Check 122, 132 whether the first or second comparison meets the criteria,

[0157] - If the criteria are not met, repeat modify 121, 131 and check 122, 132.

[0158] The iterative optimization process in this disclosure is an iterative loop and uses an optimization method (such as gradient descent or Newton's algorithm) to find the optical characteristics of the micro-optical elements 13, 14 that meet the criteria defined in the iterative optimization process.

[0159] In modification steps 121, 131, the value of the optical feature defined in the definition step is changed to another value of the optical feature. For example, the optical feature is changed in defined steps, such as by decreasing or increasing the value of the optical feature in steps of 0.5. In some embodiments, the modification step can be modified during the process, such as by randomly generating an initial step and modifying the initial step during the method process. In another embodiment, the step of changing the optical feature can be automatically determined by programming the method (gradient descent or Newton's algorithm) in such a way. This allows finding the most suitable value of the optical feature of the micro-optical elements in the first zone 11 and the second zone 12.

[0160] The modified optical features of the micro-optical elements 13, 14 are one of the following: the diopter, refractive optical function, diffractive optical function, or diffusive optical function, focal length, diameter or size, position of the micro-optical elements 13, 14. Additionally, since Figure 3 the contact lens 10 shown includes a number of micro-optical elements 13, 14 in each zone, the density of the micro-optical elements defined in the first zone 15 and the second zone 16 can be changed in the modification steps 121, 131.

[0161] In the determination step 120, the diameter of the micro-optical element 13 in the first zone 15 is selected to be between 0.3 mm and 2 mm (e.g., including any value between 0.3 mm and 2.0 mm, such as any of the following values: 0.30, 0.40, 0.50, 0.60, 0.70, 0.80, 0.90, 1.00, 1.10, 1.20, 1.30, 1.40, 1.50, 1.60, 1.70, 1.80, 1.90, 2.00), and the diameter d 16 of the micro-optical element 14 in the second zone 16 is selected to be between 0.3 mm and 2 mm (e.g., including any value between 0.3 mm and 2.0 mm, such as any of the following values: 0.30, 0.40, 0.50, 0.60, 0.70, 0.80, 0.90, 1.00, 1.10, 1.20, 1.30, 1.40, 1.50, 1.60, 1.70, 1.80, 1.90, 2.00). The micro-optical element 13 in the first zone 15 is defined to have a spherical power between 1 diopter and 20 diopters, preferably between 1 diopter and 10 diopters, and the micro-optical element 14 in the second zone 16 is defined to have a spherical power between 1 diopter and 20 diopters, preferably between 1 diopter and 10 diopters.

[0162] Additionally, the surface shape of the micro-optical elements located in each zone can be changed to a spherical surface shape, aspherical surface shape, toric surface shape, or non-toric surface shape. The refractive optical function can be changed to a diffractive optical function, for example, or vice versa.

[0163] In Figure 3 In the example shown, the diopter of the micro-optical element 13 is selected as an optical characteristic optimized for the first zone 15, and the diameter of the micro-optical element 14 is selected as an optical characteristic optimized for the second zone 16. This means that different optical characteristics can be selected for the first and second zones. In another embodiment, the optical characteristics selected for the first and second zones are the same.

[0164] In the inspection steps 122, 132, the criteria to be met can be the minimum of the quadratic deviation (e.g., the sum of the squared differences) between the first optical function and the first target function and / or the minimum of the quadratic deviation between the second optical function and the second target function, or the minimum of a specific cost function, or the values or value ranges of the first target optical function and the second target optical function, or a threshold, etc. When the criterion for the first zone 15 is the minimum of the quadratic deviation between the first optical function and the first target function, the optical characteristics of the micro-optical element 13 included in the first region are calculated (i.e., modified) so as to minimize the quadratic deviation between the first optical function and the first target function. Similarly, when the criterion for the second zone 16 is the minimum of the quadratic deviation between the second optical function and the second target function, the optical characteristics of the micro-optical elements 13, 14 included in the second region are calculated (i.e., modified) so as to minimize the quadratic deviation between the second optical function and the second target function. By way of non-limiting example, the deviation can be the root mean square deviation. The minimum is detected when the quadratic deviation between the first optical function and the first target optical function no longer changes (e.g., when the quadratic deviation between two successive iterations is below a predefined threshold). In this case, the iterative optimization process of the embodiment ends. This also applies to the deviation between the second optical function and the second target function.

[0165] In another embodiment, the criterion is a specific cost function. The cost function can be based on the integral of the value of the modulation transfer function and the integral of the value of the target modulation transfer function.

[0166] When the criteria for the first and second zones are the minimum of a specific cost function, the optical characteristics of the micro-optical element 13 included in the first region and the optical characteristics of the micro-optical element 14 included in the second region are each calculated (i.e., modified) so as to minimize the specific cost function. By way of non-limiting example, the iterative optimization process of the embodiment minimizes the following cost function for the first region and / or the second region of the contact lens 10, and the iterative optimization process ends when the value of the cost function is below a given amount. As for the above embodiment, the iterative optimization process ends when the minimization of the cost function no longer changes.

[0167] In another embodiment, the criterion is a value range of a first target optical function and / or a value range of a second optical function. In this example, the optical characteristics of the micro-optical elements of each zone are changed until the first optical function and accordingly the second optical function exhibit values included within the value ranges of the first target optical function and accordingly the second target optical function. Otherwise, a stopping criterion of the optimization function (precision of the parameters, precision of the cost function, number of iterations) can be used. In a preferred embodiment, when the first target optical function and accordingly the second target optical function reach their respective criteria, a new iteration (i.e., this means changing the optical characteristics) is started to verify whether a better result is obtained with this new optical characteristic. If not, the optical characteristics of the previous iteration are selected as the optical characteristics of the micro-optical elements 13, 14. The optimization loop can be repeated until the values of the first optical function and the second optical function are equal to the intermediate value of the value range of the first target optical function or the second target optical function.

[0168] In another embodiment, the criterion is a threshold. This means that when the first target optical function and accordingly the second target optical function include values reaching the threshold, the determination steps 120, 130 stop.

[0169] Additionally, in addition to the above criteria, the optimization process of method 100 can further include a stopping criterion corresponding to the number of iterations. The stopping criterion corresponds to an additional criterion and is used together with one of the criteria disclosed above. The stopping criterion allows the iterative optimization process to stop when the above criteria are not met (e.g., when the minimum value or the threshold is not reached). By way of non-limiting example, for instance, when the first target optical function and the second target optical function are defined, the number of iterations can be set between 10 and 2000 (e.g., between 10 and 100). In an embodiment of the iterative optimization process, when the current iteration reaches the set number of iterations, the optimization process ends even if the above criteria are not satisfied.

[0170] In method 100, if the criteria are met, for example, when the result of the cost function reaches its minimum value (or one of its minimum values) or is lower than a predefined threshold, or when the current iteration reaches the set number of iterations, the optimization loop of the determination steps 120, 130 ends. This means that the determined value of the optical characteristics of the micro-optical element 13 included in the first zone 15 has the value of the optical characteristics given at the end of the checking step 122 in the determination step 120. Similarly, the determined value of the optical characteristics of the micro-optical element 14 included in the second zone 16 has the value of the optical characteristics given at the end of the checking step 132 in the determination step 130.

[0171] If the criteria are not met in the checking step 122, a new iteration of the determination step 120 is implemented to repeat the modification step 121 and the checking step 122 in the determination step 120. Similarly, if the criteria are not met in the checking step 132 of the determination step 130, a new iteration of the determination step 130 is implemented to repeat the modification step 131 and the checking step 132 in the determination step 130.

[0172] A new iteration is made from the modification steps 121, 131 to the checking steps 122, 132 in the determination steps 120, 130, in which it is again checked whether the criteria are met. If the criterion is the number of iterations, the loop is repeated until the result of the cost function reaches a minimum at the last iteration, etc., or the optimization loop reaches a set number of iterations.

[0173] When the number of iterations is set, at the end of the last iteration, the optical characteristics are specified as the optical characteristics provided at the end of the checking steps 122, 132 in the determination steps 120, 130. More specifically, the optical characteristics of the determination steps 120, 130 have the values selected in the modification steps 121, 131 of the last optimization loop iteration of the determination steps 120, 130.

[0174] Preferably, at the end of the checking step 122, the value of the optical characteristic providing the lowest quadratic deviation value in the loop will be specified as the value of the optical characteristic of the micro-optical element 13 included in the first region 15, and correspondingly at the end of the checking step 132, the value of the optical characteristic providing the lowest quadratic deviation value in the loop will be specified as the value of the optical characteristic of the micro-optical element 14 included in the second region 16. In this case, even if the number of iterations is set, the loops of the determination steps 120, 130 can stop when the lowest value is reached.

[0175] In each of the determination steps 120, 130, if the value of the optical characteristic is not allowed to reach the criteria, such as the minimum of the quadratic deviation or the minimum of the cost function, etc., the determination steps 120, 130 stop at the set number of iterations. In this case, the computer selects a number of optical characteristics to be determined in the new iteration loop of the determination steps 120, 130. In the determination step 120 of the current example, only the selected optical characteristic (e.g., diopter) of the micro-optical element 13 in the first region 15 is changed. However, for the second region 16, only changing the value of the diameter of the micro-optical element 14 in the second region 15 is not sufficient to reach the criteria. Therefore, both the diameter and the diopter have been determined in the determination step.

[0176] Then, method 100 includes step 140 of providing the final lens design of contact lens 10. In fact, the computer used to implement the method provides output data including the final lens design of contact lens 10. The final lens design is based on the values of the optical characteristics of the micro-optical elements determined at the end of determination steps 120 and 130. The final lens design may also be based on a preliminary lens optical design. The final lens optical design corresponds to the optical design of contact lens 10 intended to be worn by a wearer. Thus, the final lens optical design corresponds to the optical design of the contact lens to be worn on the wearer's eye. Accordingly, the output data may be used by a computer or other device or the computer already used to manufacture the contact lens.

[0177] Then, the final lens design of the contact lens is used to manufacture contact lens 10, which is then intended to be worn by a wearer to help improve his vision. In this case, the final lens design of contact lens 10 becomes the optical design of contact lens 10 that is manufactured and worn by the wearer.

[0178] At the end of method 100, Figure 3 The micro-optical element 13 shown is a refractive microlens with a diameter of 1 mm, a diopter of 4 diopters, and a focal length of 1000 mm, and the micro-optical element 14 in the second zone 16 is a refractive microlens with a diameter of 1 mm, a diopter of 4 diopters, and a focal length of 250 mm.

[0179] Figure 4 An example of a contact lens 30 obtained using method 100 is also shown. In this embodiment, the first zone 15, the sub-zone 18 of the first zone, and the second zone 16 as disclosed in the previous embodiment as shown are found. Therefore, only the differences from the embodiment as shown are described. Figure 3 As shown Figure 3 are described.

[0180] In this embodiment, the density or number of the micro-optical elements 13 in the first zone 15 and correspondingly the density or number of the micro-optical elements 14 in the second zone 16 are further selected as the optical characteristics to be optimized in determination step 120 and correspondingly determination step 130. The number of micro-optical elements in the first zone 14 and the second zone 16 is, for example, between 2 and 10,000 micro-optical elements, for example, between 4 and 100 micro-optical elements.

[0181] In particular, the density or number, the diopter, and the diameter of the micro-optical elements are selected as the optical characteristics to be determined in determination steps 120 and 130.

[0182] Each determination step 120, 130 is configured to first determine the density or number of the micro-optical elements 13, 14 in a given zone of the contact lens 10, then determine the value of the diopter of the micro-optical elements, and finally determine the value of the diameter of the micro-optical elements. This configuration allows for obtaining results more quickly.

[0183] In the case where the values of the density or number of the micro-optical elements, the value of the diopter, and the value of the diameter of the micro-optical elements do not allow reaching the criteria defined in the definition steps 120, 130, the computer selects other optical characteristics, such as the position, focal length, geometry, refractive optical function, diffusive optical function, or diffractive optical function of the micro-optical elements 13, 14. In this case, each determination step is thus configured to determine the optical characteristics, for example, in the following order: the density or number of the micro-optical elements, the diopter or focal length of the micro-optical elements 13, 14, the diameter (or size), the position, the geometry, and the refractive optical function, diffusive optical function, or diffractive optical function. It is also possible to determine only a part of the optical characteristics in the previous list, and other optical characteristics are selected as predetermined values.

[0184] In Figure 4 the example shown, the first zone 15 of the contact lens 30 obtained by the method 100 includes six micro-optical elements 13. This means that the number of micro-optical elements 13 included in the first zone 15 of the final lens design is better than the number of micro-optical elements 13 included in Figure 3 the first zone 15 of the preliminary lens optical design of the contact lens 10 shown. Figure 4 The other optical characteristics of the micro-optical elements 13 in the first zone 15 shown are similar to Figure 3 the optical characteristics obtained by the method 100 shown.

[0185] At the end of the loop of the determination step 130, each optical element 14 included in the second zone 16 is adjacent to the other micro-optical elements 14 in the second zone 16. In other words, the micro-optical elements 14 in the second zone 16 are in contact with each other. This adjacent arrangement of the micro-optical elements provides a higher density of micro-optical elements 14 on the second zone 16 of the contact lens 30. For example, the density of the adjacent micro-optical elements 16 included in the second zone 16 is greater than or equal to 60% on the surface, or advantageously 80%. In this example, the density of the micro-optical elements on the second zone 16 is 100%. This means that the micro-optical elements cover the entire area of the second zone 16.

[0186] In a preferred embodiment, as Figure 4 shown, all the micro-optical elements 14 in the second zone 16 are the same. This means that all the micro-optical elements have the same optical characteristics. For example, Figure 4The micro-optical elements 14 of the second zone 16 shown are spherical microlenses and each has a diameter of, for example, 1 mm and a diopter of +4 diopters. Figure 4 The micro-optical elements 14 of the second zone 16 shown are diffractive micro-optical elements. In Figure 4 , the structure of the arrangement of the micro-optical elements has a circular pattern. Alternatively, the structure of the arrangement of the micro-optical elements 14 may have a hexagonal pattern as shown in Figure 5 or a rectangular pattern as shown in Figure 6 .

[0187] In this example, the micro-optical element 13 positioned close to the contour 17 of the first zone 15 may contact the micro-optical element 14 positioned close to the contour 17 of the first zone 15.

[0188] Therefore, Figure 4 it is shown that in method 100, the number of micro-optical elements defined in the definition step 110 can be modified in the determination steps 120, 130, specifically in the modification steps 121, 131. For example, if only one micro-optical element 13 and / or 14 has been defined for the first zone 15 and / or the second zone 16, then this number can be increased during the iterative optimization process of the determination steps 120, 130. In another example, if several micro-optical elements 13 and / or 14 have been defined for the first zone 15 and / or the second zone 16, then the number of micro-optical elements can be increased or decreased during the iterative optimization process of the determination steps 120, 130.

[0189] Figure 7 , Figure 8 and Figure 9 show examples of contact lenses 40, 50, 60 obtained using method 100. In these embodiments, the first zone 15, the sub-zone 18 of the first zone 15, and the second zone 16 disclosed in the previous embodiments as shown in Figure 3 are found. Therefore, only the differences from the embodiment shown in Figure 3 are described.

[0190] In Figure 7In it, the first zone 15 of the contact lens 50 includes micro-optical elements 13 having the same size, the same optical function, the same focal length but different diopters. For example, the micro-optical element numbered 13a has a diopter of 1 diopter, while the micro-optical element numbered 13b has a diopter of 4 diopters. Additionally, the second zone 16 of the contact lens 50 includes micro-optical elements 14 having the same size, the same optical function, the same focal length but different diopters. For example, the micro-optical element numbered 14a has a diopter of 1 diopter, while the micro-optical element numbered 14b has a diopter of 4 diopters. This means that the micro-optical elements included in the same zone can have different diopters. Therefore, the determination steps 120, 130 can be applied to specific micro-optical elements, such as those that have been selected or defined by a computer in the definition step 110. Additionally, this also means that at the end of the determination step, the micro-optical elements in the same zone can have different optical characteristics.

[0191] Figure 8 Another example of a contact lens 60 is shown. In this example, the first zone 15 of the contact lens 60 includes micro-optical elements 13 having different sizes. For example, in Figure 8 it, the first zone 15 includes two micro-optical elements numbered 13c with a diameter of 2 mm and two micro-optical elements numbered 13d with a diameter of 4 mm. Additionally, the second zone 16 of the contact lens 60 includes micro-optical elements 14 having different sizes. For example, the second zone 16 includes two micro-optical elements 14c with a diameter of 2 mm and five micro-optical elements 14d with a diameter of 4 mm.

[0192] Figure 9 Another example of a contact lens 60 is shown, where the micro-optical elements of these zones are clustered. In several clusters, the micro-optical elements are adjacent. For example, the first zone 15 of the contact lens 60 includes three different clusters having four, five, and six micro-optical elements 13 respectively. The second zone 16 of the contact lens 60 includes five different clusters having two, three, four, five, and eight micro-optical elements 14 respectively.

[0193] In this embodiment, the second zone 16 of the contact lens 60 presents a width 26 (or radial dimension) of the second zone 16 defined between the contour 17 and the contour 20 of the contact lens 60. The width 26 of the second zone 16 is greater than the diameter d of the micro-optical elements 14 of the second zone 16 14 . Generally, the width 26 of the second zone 16 is between the diameter of the micro-optical element and twice the diameter of the micro-optical element.

[0194] Although Figures 7 to 9 only contact lenses with two zones are shown, these examples are also applicable to contact lenses 10 having more than two zones.

[0195] Figure 13 shows a second example of method 200 according to the present disclosure. Method 200 is a method for designing contact lenses 70, 90 as shown in Figure 10 and Figure 11 . The contact lenses 70, 90 are preferably corrective lenses 70, 90.

[0196] In another embodiment as shown in Figure 10 and Figure 11 , the contact lens 70 includes at least three zones, and the micro-optical elements are specifically arranged in these zones, and the micro-optical elements are arranged to be different between the zones. Each of these zones of the contact lens includes an arrangement of a plurality of micro-optical elements.

[0197] For example, compared with method 100, defining the first zone, the second zone, and the third zone allows for considering more variations in the pupil size of the wearer's eye. Therefore, method 200 is improved because the contact lens provided at the end of method 200 has an optical lens design that more consider the variations in the pupil diameter. Compared with method 100, method 200 provides a better compromise between visual acuity and visual discomfort caused by myopia evolution control for the corrective contact lens 10.

[0198] Figure 13 The method 200 shown includes Figure 12 all the steps of method 100. Therefore, only the differences from Figure 12 will be described.

[0199] In Figure 10 the non-limiting example shown, the contact lens 70 is divided into three zones: a central disc-shaped first zone 75, an annular disc-shaped second zone 76, and an annular disc-shaped second zone 86. The first zone 75 includes micro-optical elements 73 having at least one optical feature, the second zone 76 includes micro-optical elements 74 having at least one optical feature, and the third zone 86 includes micro-optical elements 82 having at least one optical feature.

[0200] The optical features of the micro-optical elements 82 in the third zone 86 include at least one of the following optical features: diopter; geometry; refractive optical function, diffractive optical function, or diffusive optical function; focal length; diameter or size; position.

[0201] The first zone 75 is bounded by a circular contour 77 and includes at least one sub-zone 78 bounded by a circular contour 79. This sub-zone 78 lacks micro-optical elements and covers at least 10% of the first zone 75. For example, the sub-zone 78 has a diameter of 2 mm and is centered on the ophthalmic lens optical vertex V of the contact lens 70. This feature allows maintaining the visual acuity of the wearer.

[0202] The first zone 75, the second zone 76, and the third zone 86 are concentric. These zones are centered on the vertex V of the preliminary lens optical design of the contact lens 70. The second zone 76 surrounds the first zone 75 and is bounded internally by a circular profile 77 and externally by a circular outer profile that coincides with the circular inner profile 80 of the third zone 86. The third zone 86 surrounds the second zone 75 and is bounded internally by a circular profile 80 and externally by a circular outer profile that coincides with the outer edge 81 of the contact lens 70.

[0203] The diameter of the circular outer profile 77 of the first zone 75 is 4 mm. The circular inner profile of the second zone 76 presents a diameter of 4 mm.

[0204] The circular outer profile of the second zone 76 presents a diameter between 6.00 mm and 8 mm. Preferably, the circular inner profile 80 of the third zone 86 presents a diameter between 6.00 mm and 8 mm (e.g., including any value between 6.00 mm and 8.00 mm, such as any of the following values: 6.00, 6.10, 6.20, 6.30, 6.40, 6.50, 6.60, 6.70, 6.80, 6.90, 7.00, 7.10, 7.20, 7.30, 7.40, 7.50, 7.80, 7.90, 8.00), and the outer profile (i.e., the outer edge 81) of the third zone 86 presents a diameter between 8 mm and 10 mm (typically, including any value between 8.00 mm and 10.00 mm, such as any of the following values: 8.00, 8.10, 8.20, 8.30, 8.40, 8.50, 8.60, 8.70, 8.80, 8.90, 9.00, 9.10, 9.20, 9.30, 9.40, 9.50, 9.80, 9.90, 10.00).

[0205] The diameter of the circular outer profile of the second zone is 6 mm, the diameter of the inner profile of the third zone 86 is 6 mm, and the diameter of the outer edge 81 is 10 mm.

[0206] The second zone 76 has a width defined by its inner and outer profiles, which depends on the size of the micro-optical elements 74 (specifically the largest micro-optical element 74) of the second zone 76. Similarly, the third zone 86 has a width defined by its inner and outer profiles, which depends on the size of the micro-optical elements 82 (specifically the largest micro-optical element 82) of the third zone 86. Thus, it is an easy means to automatically define the sizes of the second and third zones in the defining step 110.

[0207] The contact lens 70 has a first region, a second region, and a third region. The first region is included in the first zone 75 and includes some or all of the micro-optical elements 73 of the first zone (in this example, all of the micro-optical elements 73 of the first zone 75). In this example, the first region of the contact lens 70 is bounded by an outer contour, which coincides here with the contour 77 that defines the first zone 75. This means that the first region also includes a sub-region 78 without micro-optical elements. The second region is included in the union of the first zone 75 and the second zone 76 and includes some or all of the micro-optical elements 74 of the second zone (here, all of the micro-optical elements 74 of the second zone 76). The second region of the contact lens 70 also includes the micro-optical elements 73 of the first zone 75. The third region is included in the union of the first zone 75, the second zone 76, and the third zone 86 and includes some or all of the micro-optical elements 82 of the third zone 86 (here, all of the micro-optical elements 82 of the third zone 86). The third region of the contact lens 70 also includes the micro-optical elements 73 of the first zone 75 and the micro-optical elements 74 of the second zone 76. This means that the third region of the contact lens 70 overlaps with the first zone 75, the second zone 76, and the third zone 86. In this example, the third region includes the entire contact lens 70.

[0208] The micro-optical elements 73 of the first zone 75 and the micro-optical elements 74 of the second zone 76 have the same optical characteristics as the micro-optical elements 14, 13 described above for the method 100.

[0209] The size d 86 (i.e., the diameter) of the micro-optical elements 82 of the third zone 86 is fixed between 0.3 mm and 2 mm when projected onto the facial plane (perpendicular to the main axis of the contact lens 70) (for example, including any value between 0.3 mm and 2.0 mm, such as any of the following values: 0.30, 0.40, 0.50, 0.60, 0.70, 0.80, 0.90, 1.00, 1.10, 1.20, 1.30, 1.40, 1.50, 1.60, 1.70, 1.80, 1.90, 2.00).

[0210] The micro-optical elements 82 of the third zone 86 are configured to have a spherical power between 1 diopter and 20 diopters, for example, between 1 diopter and 10 diopters.

[0211] The micro-optical elements 82 of the third zone 86 are defined to have a surface shape, such as a rhomboid surface shape or a spherical surface shape or an aspherical surface shape or a toric surface shape.

[0212] Each refractive micro-optical element 82 can be a single-focus micro-optical element or a bifocal micro-optical element. Each diffractive micro-optical element 82 includes, for example, a diffractive Pi Fresnel microlens. As an alternative, each diffractive micro-optical element 82 includes a diffusive micro-optical element that scatters light.

[0213] In the defining step 110 of the method 200, in which the sizes of the first zone, the second zone, and the third zone are defined, the first zone 75 includes six micro-optical elements 73, the second zone 76 includes eight micro-optical elements 74, and the third zone 86 includes eight micro-optical elements 82.

[0214] The optical characteristics of all the micro-optical elements 73, 74, 82 in the first zone 75, the second zone 76, and the third zone 86 have the same value.

[0215] In the defining step 110, the micro-optical elements 73 in the first zone 75 are refractive microlenses with a diameter of 1 mm, a diopter of 4 diopters, and a focal length of 1000 mm, and the micro-optical elements 74 in the second zone 76 are refractive microlenses with a diameter of 1 mm, a diopter of 4 diopters, and a focal length of 1000 mm. The micro-optical elements 82 in the third zone 86 are refractive microlenses with a diameter of 1 mm, a diopter of 4 diopters, and a focal length of 1000 mm.

[0216] In a non-limiting embodiment, the micro-optical elements 73 in the first zone 75 have optical characteristics suitable for providing a first myopia control function for the wearer's myopia, and the micro-optical elements 74 in the second zone 76 have optical characteristics suitable for providing a second myopia control function for the wearer's myopia. The micro-optical elements 82 in the third zone 86 defined in the defining step 110 have optical characteristics that provide a third myopia control function for the wearer's eyes for myopia. In other words, the micro-optical elements 82 in the third zone 86 have optical characteristics suitable for providing a specific blurred spatial distribution. Therefore, the micro-optical elements in the third zone 86 have optical characteristics that provide a third defocus spatial function.

[0217] The third myopia control function for myopia can be similar to the first myopia control function and the second myopia control function for myopia. In another embodiment, the third myopia control function for myopia is different from the first myopia control function and the second myopia control function for myopia.

[0218] The first myopia control function depends on the optical characteristics of the micro-optical elements 73 included in the first zone 75, the second myopia control function depends on the optical characteristics of the micro-optical elements 74 included in the second zone 76, and the third myopia control function depends on the optical characteristics of the micro-optical elements 82 included in the third zone 86.

[0219] Since the micro-optical elements of the contact lens 70 have the same optical characteristics, the first optical function, the second optical function, and the third optical function obtained with the preliminary design are similar.

[0220] In an embodiment, the micro-optical elements 73, 74, and 82 include microlenses that provide refractive power. The refractive powers of the micro-optical elements 73 (microlenses) in the first zone 75, the micro-optical elements 74 (microlenses) in the second zone 76, and the micro-optical elements 82 (microlenses) in the third zone 86 are different from the refractive power of the macroscopic optical components of the contact lens 70. In other embodiments, the micro-optical elements 73, 74, and 82 may provide a diffractive micro-optical function or a diffusive micro-optical function as described above.

[0221] After defining the preliminary lens optical design of the contact lens 70, the method 200 performs the determination steps 120, 130 as Figure 12 described.

[0222] In Figure 10 the example shown, only the diameters and refractive powers of the micro-optical elements 73, 74, 82 are determined in the determination steps 120, 130.

[0223] The method 200 further includes a step 210 of determining values of the diameters and refractive powers of the micro-optical element 82 superimposed on the contact lens 70 for the third zone 86 of the contact lens 70. As for the method 100, the determination step 210 takes into account the optical characteristics of the micro-optical elements determined in the previous determination steps 120, 130.

[0224] To this end, the third optical function of the contact lens 70 is calculated over the entire third region of the contact lens 70.

[0225] Figure 14 Examples of a first target optical function, a second target optical function, and a third target optical function are shown. In this example, the first target optical function, the second target optical function, and the third target optical function are similar. Thus, in this example, the first target optical function, the second target optical function, and the third target optical function are referred to as the target optical function 1000. In the present disclosure, all modulation transfer functions can be obtained in the visible spectrum, for example, at wavelengths between 400 nm and 800 nm or between 400 nm and 780 nm. Advantageously, all modulation transfer functions are calculated for a central wavelength between 540 nm and 560 nm, for example, at 550 nm.

[0226] Figure 14 The modulation transfer function shown is preferably calculated with an aperture of 4 mm and at a wavelength of 550 nm. Here, the aperture is centered on the optical center V of the contact lens (the optical design of the contact lens).

[0227] In this disclosure, the aperture corresponds to a virtual diaphragm positioned on the contact lens (i.e., on the initial lens optical design of the contact lens). The use of the aperture allows for the easy simulation of the effect of the eye pupil, such as when the wearer is engaged in activities in a bright environment (e.g., for outdoor activities), the pupil of the wearer's eye decreases, and when the wearer is engaged in activities in a low-light environment (e.g., for indoor activities), the pupil of the wearer's eye increases.

[0228] According to this embodiment, Figure 14 The target optical function shown exhibits values greater than or equal to 0.95, 0.90, 0.85, 0.80, 0.75, 0.70, 0.75, 0.60 in the spatial frequency range between 0 and 5 cycles per degree. Additionally, the target optical function has values greater than or equal to 0.40, 0.35, 0.30 in the spatial frequency range between 10 and 20 cycles per degree. Then, the target optical function has a value greater than or equal to 0.20 in the spatial frequency range between 20 and 30 cycles per degree. Preferably, the target optical function has values greater than or equal to 0.30, 0.28, 0.26, 0.24, 0.22, 0.20 in the spatial frequency range between 20 and 30 cycles per degree.

[0229] Then, in determination step 210, the third optical function is then compared with Figure 14 the target optical function shown (in the third comparison).

[0230] In method 200, determination step 210 of determining the value of the selected optical characteristics of the micro-optical elements 82 in the third region 86 includes an iterative optimization process, which includes the following steps:

[0231] - Modify 211 the optical characteristics of the micro-optical elements 82,

[0232] - Check 212 whether the third comparison meets the criteria,

[0233] - If the criteria are not met, repeat modification 211 and check 212.

[0234] The implementation of the iterative optimization process in determination step 210 is similar to Figure 12 the iterative optimization processes of determination steps 120, 130 shown. For example, the diameter and diopter of the micro-optical elements in the same region are determined simultaneously. This means that the determination step is configured to change the values of the diameter and diopter of the micro-optical elements belonging to the same region at each iteration.

[0235] As described above, the determining step 210 includes a step of defining a criterion. The criterion may be a minimum value of a quadratic deviation between a third optical function and a third objective function and / or a minimum value of a specific cost function, or a value or range of values of the third objective optical function, and so on. In addition, the number of iterations is defined.

[0236] In the modifying step 210, the value of the optical feature defined in the defining step 110 is changed to another value of at least one optical feature.

[0237] For example, the diameter d of the micro-optical element 82 in the third zone 13 86 is selected to be between 0.3 mm and 2 mm (for example, including any value between 0.3 mm and 2.0 mm, such as any of the following values: 0.30, 0.40, 0.50, 0.60, 0.70, 0.80, 0.90, 1.00, 1.10, 1.20, 1.30, 1.40, 1.50, 1.60, 1.70, 1.80, 1.90, 2.00). The micro-optical element 82 in the third zone 86 is defined to have a spherical power between 1 diopter and 20 diopters, for example, between 1 diopter and 10 diopters.

[0238] In another embodiment, in the modifying step 211, the refractive optical function, diffractive optical function or diffusive optical function and / or focal length, position of the micro-optical element 82 in the third zone 86 defined in the defining step 110 are changed. In addition, the surface shape of the micro-optical element may be changed to a spherical surface shape, or an aspherical surface shape, or a toroidal surface shape. The refractive optical function may be changed to a diffractive optical function, for example, or vice versa. As described above, since the contact lens 70 includes a plurality of micro-optical elements 73, 74, 82 in each zone, the density or number of micro-optical elements is an optical feature that can be optimized in the determining step 210. The density is selected such that the micro-optical elements 82 cover 20% to 80% of the third zone 86. In another example, at the end of the loop of the determining step 210, the third zone 86 may include a specific number of micro-optical elements 82. The specific number of micro-optical elements 82 may be, for example, between 2 and 10,000 (for example, 4 to 100) micro-optical elements.

[0239] Each micro-optical element in the third zone 86 is spaced apart from an adjacent micro-optical element 86 by at least 0.5 mm. For example, the edge of one of the optical elements 1 included in the third zone 86 is spaced apart from the edge of an adjacent optical element 1 by 1 mm.

[0240] When the iterative process ends, method 200 includes step 140 of providing the final lens design of the contact lens 70. In this example, the final lens design of the contact lens is based on the values of the optical characteristics of the micro-optical elements determined for the first zone, for the second zone, and for the third zone. The final lens design of the contact lens can also be based on a preliminary lens optical design (e.g., by considering the macroscopic optical function of the contact lens and / or the geometry and / or position and / or size and shape of the first zone, second zone, and third zone, etc.).

[0241] Figure 10 An example of the final lens design of the contact lens 70 is shown. In this example, the first zone 75 includes six micro-optical elements labeled with a size of d 75 the second zone 76 includes eight micro-optical elements labeled with a size of d 76 and the third zone 86 includes eight micro-optical elements labeled with a size of d 86 All the micro-optical elements 73, 74, 82 have the same size and exhibit a diameter of 2 millimeters. Additionally, all the micro-optical elements 73, 74, 86 (diffusive microlenses) of the contact lens 70 have the same diopter of 4 diopters. Other optical characteristics (geometry, optical function, focal length, position) do not change between the preliminary lens optical design and the final lens optical design.

[0242] Figure 11 An example of the contact lens 90 obtained by method 100 is also shown. In this embodiment, the first zone 75, the sub-zone 78 of the first zone, the second zone 76, and the third zone 86 as disclosed in the previous embodiment shown as Figure 10 are found. Therefore, only the differences from the embodiment shown as Figure 10 are described.

[0243] Figure 11 An example is shown where in determination step 210, in addition to the diameter and diopter, the density or number of the micro-optical elements in the third zone 86 is also determined. In this example, the first zone 75 includes six micro-optical elements labeled with a size of d 75 the second zone 76 includes eight micro-optical elements labeled with a size of d 76 and the third zone 86 includes twelve micro-optical elements labeled with a size of d 86 The micro-optical elements in the first zone 75, the second zone 76, and the third zone 86 are diffractive microlenses. In this example, the micro-optical elements in the first zone 75, the second zone 76, and the third zone 86 have the same size. For example, the micro-optical elements in the first zone 75 have a diameter of 1 millimeter, the micro-optical elements in the second zone 76 have a diameter of 1 millimeter, and the micro-optical elements in the third zone 86 have a diameter of 1 millimeter. All the micro-optical elements of the contact lens 10 have the same diopter, for example, 4 diopters.

[0244] Figure 15 Shows examples of a first optical function 1001, a second optical function 1002, and a third optical function 1003 calculated in determination steps 120, 130, 210, respectively. The first optical function 1001, the second optical function 1002, and the third optical function 1003 are optical functions obtained with the final lens optical design of the corrective lens 90 shown. Figure 11 The corrective lens 90 shown.

[0245] Figure 15 Shows examples in which, in determination steps 120, 130, and 210, for spatial frequencies within a predetermined range (e.g., within a spatial frequency range between 0 and 30 cycles per degree), the first optical function 1001, the second optical function 1002, and the third optical function 1003 are calculated. Specifically, for each spatial frequency between 0 and 5 cycles per degree and between 10 and 30 cycles per degree and between 20 and 30 cycles per degree, the first optical function 1001, the second optical function 1002, and the third optical function 1003 are calculated.

[0246] Generally, different ranges of spatial frequencies (0 to 5 cycles per degree and 10 to 30 cycles per degree) correspond to different effects on the modulation transfer function. The spatial frequency range between 0 and 5 cycles per degree corresponds to the control of myopia, and the spatial frequency range between 10 and 30 corresponds to visual acuity. Figure 15 The modulation transfer function shown is calculated with a circular aperture having a size (i.e., diameter) between 3 mm and 10 mm and centered on the optical center or vertex V of the contact lens 90. In the following examples, the aperture is related to or defined as a specific part of the contact lens 90. This means that an aperture with a diameter of 4 mm corresponds to a circular part with a diameter of 4 mm defined on the contact lens 90. The diameter of the aperture defines a part of the contact lens 90 through which light passes to calculate the modulation transfer function. According to the present disclosure, a specific part of the contact lens 90 can be defined over the entire area of the contact lens 90.

[0247] Figure 15 The first optical function 1001 shown is calculated with an aperture of 4 mm and at a wavelength of 550 nm. Figure 15 The second optical function 1002 shown is calculated with an aperture of 6 mm and at a wavelength of 550 nm. Figure 15 The third optical function 1003 shown is calculated with an aperture of 8 mm and at a wavelength of 550 nm.

[0248] According to this embodiment, Figure 15The first optical function 1001, the second optical function 1002, and the third optical function 1003 shown all exhibit values greater than or equal to 0.95, 0.90, 0.85, 0.80, 0.75, 0.70, 0.75, 0.60 in the spatial frequency range between 0 and 5 cycles per degree. In this embodiment, the first optical function 1001, the second optical function 1002, and the third optical function 1003 are similar in the spatial frequency range between 0 and 5 cycles per degree. In another embodiment, the difference between the values of the first optical function, the second optical function, and the third optical function is not greater than 5% in the spatial frequency range between 1 and 5 cycles per degree or between 1 and 3 cycles per degree.

[0249] The first optical function 1001 has values greater than or equal to 0.40, 0.35, 0.30 in the spatial frequency range between 10 and 20 cycles per degree. Then, the first optical function 1001 has a value greater than or equal to 0.20 in the spatial frequency range between 20 and 30 cycles per degree. Preferably, the first optical function 1001 has values greater than or equal to 0.30, 0.28, 0.26, 0.24, 0.22, 0.20 in the spatial frequency range between 20 and 30 cycles per degree.

[0250] The second optical function 1002 has values greater than or equal to 0.39, 0.38, 0.35, 0.30, 0.28 in the spatial frequency range between 10 and 20 cycles per degree. Then, the second optical function 1002 has a value greater than or equal to 0.15 in the spatial frequency range between 20 and 30 cycles per degree. Preferably, the second optical function 1002 has values greater than or equal to 0.28, 0.26, 0.24, 0.22, 0.20 in the spatial frequency range between 20 and 30 cycles per degree.

[0251] The third optical function 1003 has values greater than or equal to 0.39, 0.38, 0.35, 0.30, 0.28, 0.25 in the spatial frequency range between 10 and 20 cycles per degree. Then, the third optical function 1003 has a value greater than or equal to 0.15 in the spatial frequency range between 20 and 30 cycles per degree. Preferably, the third optical function 1003 has values greater than or equal to 0.28, 0.26, 0.24, 0.22, 0.20 in the spatial frequency range between 20 and 30 cycles per degree.

[0252] In this example, the second optical function 1002 exhibits a value greater than that of the third optical function 1003 within the spatial frequency range of between 10 and 20 cycles per degree. The values of the second optical function 1002 and the third optical function 1003 are compared when the spatial frequencies are similar. The difference between the value of the second optical function 1002 and the value of the third optical function 1003 is not greater than 10% within the spatial frequency range of between 10 and 20 cycles per degree.

[0253] Additionally, the first optical function 1001 exhibits a value greater than that of the second optical function 1002 within the spatial frequency range of between 10 and 20 cycles per degree. The values of the first optical function 1001 and the second optical function 1002 are compared when the spatial frequencies are similar. For example, the difference between the value of the first optical function 1001 and the value of the second optical function 1002 is not greater than 10% within the spatial frequency range of between 10 and 20 cycles per degree.

[0254] In this example, the second optical function 1002 exhibits a value greater than that of the third optical function 1003 within the spatial frequency range of between 20 and 30 cycles per degree. The values of the second optical function 1002 and the third optical function 1003 are compared when the spatial frequencies are similar. The difference between the value of the second optical function 1002 and the value of the third optical function 1003 is not greater than 10% within the spatial frequency range of between 20 and 30 cycles per degree.

[0255] Additionally, the first optical function 1001 exhibits a value greater than that of the second optical function within the spatial frequency range of between 20 and 30 cycles per degree. The values of the first optical function 1001 and the second optical function 1002 are compared when the spatial frequencies are similar. The difference between the value of the first optical function 1001 and the value of the second optical function 1002 is not greater than 10% within the spatial frequency range of between 20 and 30 cycles per degree.

[0256] Although the values of the first optical function, the second optical function, and the third optical function exhibit a difference of less than or equal to 10% within the spatial frequency range of between 10 and 30 cycles per degree, these optical functions are close to the Figure 14 target optical function shown within the same spatial frequency range. Specifically, in this example, the first optical function, the second optical function, and the third optical function are Figure 14The difference between the target optical functions is less than 10%, preferably less than 5%, and / or between 5% and 10% in a spatial frequency range between 10 and 30 cycles per degree, preferably between 10 and 20 cycles per degree and / or between 20 and 30 cycles per degree. Additionally, the difference between the first optical function, the second optical function, and the third optical function and the Figure 14 target optical function is less than 5% in a spatial frequency range between 0 and 10 cycles per degree, preferably between 0 and 5 cycles per degree and / or between 3 and 5 cycles per degree and / or between 5 and 10 cycles per degree.

[0257] Thus, at the end of determination step 210, the difference between the values of the first optical function, the second optical function, and the third optical function is less than or equal to 5% in a spatial frequency range between 0 and 5 cycles per degree, and the difference between the values of the first optical function, the second optical function, and the third optical function is less than or equal to 10% in a spatial frequency range between 10 and 30 cycles per degree, preferably between 10 and 20 cycles per degree and / or between 20 and 30 cycles per degree. This means that the final lens optical design of the contact lens 10 is well-suited to changes in the light environment because the final lens design provides an almost equivalent (with a tolerance of 10%) modulation transfer function when the pupil diameter of the wearer's eye is 4 mm, 6 mm, and 8 mm.

[0258] Reference Figure 10 、 Figure 11 and Figure 16 will describe examples of the optical characteristics of the micro-optical elements included in the third zone 86 selected at the end of the loop of determination step 210.

[0259] Figure 16 Shows the third optical function 1003 calculated on the third region of the contact lens 90 shown in Figure 11 and another third optical function 2003 calculated on the third region of the contact lens 70 shown in Figure 10 . The calculation of the third target optical function 2003 is similar to the third target optical function 1003 described above. Additionally, Figure 16 shows an example of the third target optical function presented via value intervals numbered 2004, 2005 defined for a specific spatial frequency range.

[0260] Value interval 2004 defines the value of the third target optical function between 0.60 and 0.67 at a spatial frequency of 5 cycles per degree, and value interval 2005 defines the value of the third target optical function between 0.35 and 0.45 at a spatial frequency of 10 cycles per degree. Value intervals 2004, 2005 are each examples of the criteria used in determination step 210.

[0261] In Figure 16 the example of, the third optical function numbered 2003 has:

[0262] - A value equal to 0.67 at a spatial frequency of 5 cycles per degree, and

[0263] - A value equal to 0.45 at a spatial frequency of 10 cycles per degree.

[0264] Therefore, the value of the third target optical function 2003 at a spatial frequency of 5 cycles per degree is within the value range 2004 of the third target optical function, while the value of the third target optical function 2003 at a spatial frequency of 10 cycles per degree is outside the value range 2005 of the third target optical function. Therefore, the value of the third optical function 2003 at a spatial frequency of 10 cycles per degree does not meet the criteria of the determination step 210, but the third optical function 2003 exhibits better optical characteristics.

[0265] This means that at the end of the iterative process of the determination step 210 with criteria defined as shown in Figure 16 the criteria, the optical lens design shown in Figure 10 cannot be selected.

[0266] The third optical function 1003 has:

[0267] - A value equal to 0.63 at a spatial frequency of 5 cycles per degree, and

[0268] - A value equal to 0.37 at a spatial frequency of 10 cycles per degree.

[0269] This means that the value of the third target optical function 1003 at a spatial frequency of 5 cycles per degree is included in the value range 2004 of the third target optical function, and the value of the third target optical function 1003 at a spatial frequency of 10 cycles per degree is included in the value range 2005 of the third target optical function. Therefore, the values of the third optical function 1003 at spatial frequencies of 5 and 10 cycles per degree meet the criteria of the determination step 210. At the end of the iterative process of the determination step 210 with criteria defined as shown in Figure 16 the criteria, the optical design shown in Figure 11 can be selected. Figure 11 The lens design shown in becomes the final optical lens design of a contact lens intended to be worn on the eye of a wearer. Then, a contact lens is manufactured according to this final design.

Claims

1. A computer-implemented method for designing a contact lens intended to be worn on a wearer's eye, the computer-implemented method comprising: - For a first zone of the contact lens, determining a value of at least one optical characteristic of at least one micro-optical element superimposed on the contact lens in the first zone based on a first comparison between a first optical function, calculated over the entire first region of the contact lens and representing the optical quality of the contact lens, and a first target optical function, the first region including the first zone and including at least one micro-optical element of the first zone, - For a second zone of the contact lens, determining a value of at least one optical characteristic of at least one micro-optical element superimposed on the contact lens in the second zone based on a second comparison between a second optical function, calculated over the entire second region of the contact lens and representing the optical quality of the contact lens, and a second target optical function, the second region including in the union of the first zone and the second zone and including at least one micro-optical element of the second zone, - Providing a final lens design of the contact lens based on the values of at least one optical characteristic of the micro-optical elements determined for the first zone and for the second zone, the final lens design corresponding to the optical design of the contact lens intended to be worn by the wearer.

2. The method according to claim 1, wherein The second zone is arranged to surround the first zone.

3. The method according to any one of claims 1 and 2, wherein Determining the value of at least one optical characteristic of at least one micro-optical element of the first zone is performed before determining the value of at least one optical characteristic of at least one micro-optical element of the second zone.

4. The method according to claim 3, comprising: - For a third zone of the contact lens arranged annularly around the second zone, determining a value of at least one optical characteristic of at least one micro-optical element superimposed on the contact lens in the third zone based on a third comparison between a third optical function of the contact lens calculated over the entire third region of the contact lens and a third target optical function, the third region including in the union of the first zone, second zone and third zone and including at least one micro-optical element of the third zone, the final lens design of the contact lens also being based on the value of at least one optical characteristic of the micro-optical elements determined for the third zone.

5. The method according to claim 4, wherein, Determining the value of at least one optical characteristic of at least one micro-optical element of the third zone is performed after determining the value of at least one optical characteristic of at least one micro-optical element of the second zone.

6. The method according to any one of claims 4 to 5, wherein The first zone of the contact lens, the second zone of the contact lens and the third zone of the contact lens are concentric.

7. The method according to any one of claims 1 to 6, wherein At least one of the first optical function, the second optical function, the first target optical function and the second target optical function is based on a modulation transfer function or a point spread function.

8. The method according to any one of claims 1 to 7, wherein, The first target optical function and the second target optical function are the same.

9. The method according to any one of claims 1 to 8, wherein, The first target optical function and the second target optical function are different.

10. The method according to any one of claims 1 to 9, wherein, At least one of the first optical function and the second optical function is calculated for a spatial frequency between 1 and 5 cycles per degree, and / or between 5 and 20 cycles per degree and / or between 20 and 30 cycles per degree.

11. The method according to any one of claims 1 to 10, wherein, At least one optical characteristic of at least one micro-optical element of the first zone and at least one optical characteristic of at least one micro-optical element of the second zone include at least one of the following: - Diopter; - Geometry; - Refractive optical function, diffractive optical function or diffusive optical function; - Focal length; - Diameter; - Position.

12. The method according to claim 11, wherein, At least one micro-optical element of the first zone has a circular profile, the diameter of at least one micro-optical element of the first zone being between 0.3 mm and 2 mm, and / or at least one micro-optical element of the second zone has a circular profile, the diameter of at least one micro-optical element of the second zone being between 0.3 mm and 2 mm.

13. The method according to any one of claims 11 and 12, wherein, The diopter of at least one micro-optical element of the first zone is between 1 diopter and 10 diopters, and / or the diopter of at least one micro-optical element of the second zone is between 1 diopter and 10 diopters.

14. The method according to any one of claims 1 to 13, wherein, The first zone includes a plurality of micro-optical elements, and at least one optical characteristic of the first zone includes the density of the micro-optical elements on the first zone or the number of the micro-optical elements in the first zone, and / or The second zone includes a plurality of micro-optical elements, and at least one optical characteristic of the first zone includes the density of the micro-optical elements on the second zone or the number of the micro-optical elements in the second zone.

15. A method for manufacturing a contact lens, the method comprising: - A step of using a computer-implemented method according to any one of claims 1 to 14 to determine the design of the contact lens, - A step of manufacturing the contact lens based on the design.

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