How to design contact lenses

Abstract

1. A computer-implemented method for designing a contact lens, comprising: determining, for a first zone 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 zone based on a first comparison between a first optical function of the contact lens calculated over the entire first region of the contact lens and a first target optical function; and determining, for a second zone 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 second zone based on a second comparison between a second lens optical function of the contact lens calculated over the entire second region of the contact lens and a second target optical function, wherein the second zone is included in the junction of the first zone and the second zone.

Description

[Technical Field]

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

[0002] Myopia of the eye is characterized by the fact that the light coming from the far distance of the eye is focused in front of the retina.In other words, the myopic eye is too long to make clear distant vision.Myopia has both genetic and environmental origins.In the latter case, myopia progresses due to the increase in near vision tasks and the decrease in outdoor activities.

[0003] Many solutions exist that aim to alleviate discomfort caused by myopia and / or slow the progression of myopia. In particular, it is known to use ophthalmic lenses that are intended to be worn in front of the wearer's eye and have an optical zone that includes an arrangement of micro-optical elements with optical features adapted to provide myopia control functionality in order to alleviate discomfort caused by myopia and / or slow the progression of myopia. While these solutions may be functional, the design process does not take into account the effect of the light environment on variations in the size of the wearer's pupil, especially when the wearer engages in indoor or outdoor activities. As a result, the design of these lenses is not adequately adapted to variations in the light environment when applied to contact lenses. Not considering the light environment during the design process of these contact lenses can potentially alter the vision of the wearer wearing these contact lenses. Summary of the Invention [Problem to be solved by the invention]

[0004] In this regard, one object of the present invention is to provide a method for designing corrective contact lenses that have a better trade-off for the wearer between visual acuity and visual discomfort due to optical features that achieve myopia progression reduction. [Means for solving the problem]

[0005] According to the present invention, the above objects are achieved by providing a computer-implemented method for designing a contact lens to be placed on a wearer's eye, said computer-implemented method comprising: - determining, for a first zone of the contact lens, a value of at least one optical feature of at least one micro-optical element superimposed on the contact lens in the first zone based on a first comparison, the first comparison being a comparison between a first optical feature representative of the optical quality of the contact lens calculated over the entire first zone of the contact lens and a first target optical feature, the first zone being included in the first zone and including the at least one micro-optical element of the first zone; - determining, for a second zone of the contact lens, a value of at least one optical feature of at least one micro-optical element superimposed on the contact lens in the second zone based on a second comparison, the second comparison being a comparison between a second optical feature representative of the optical quality of the contact lens calculated over the entire second zone of the contact lens and a second target optical feature, the second zone being included at the junction 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 for a contact lens based on the values ​​of at least one optical characteristic of the micro-optical elements determined for the first zone and the second zone, wherein the final lens design is the optical design of a contact lens intended to be worn by a wearer.

[0006] Due to the use of specific regions and calculations relative to these regions, the method makes it possible to take into account variations in pupil size induced by variations in the light environment during the contact lens design process, and the contact lenses obtained by the method are well adapted to the variations in the light environment and therefore offer the wearer a better trade-off between visual acuity and myopia prevention effect, for example with regard to visual discomfort caused by micro-optical elements realizing the reduction of myopia progression.

[0007] As a result, the method provides a contact lens having an optical lens design determined by taking into account variations in pupil diameter.

[0008] According to one embodiment, the contact lenses worn by the wearer are corrective contact lenses.

[0009] According to one embodiment, the second zone is arranged around the first zone.

[0010] According to one 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.

[0011] According to a final embodiment, the method comprises the steps of: - determining, for a third zone of the contact lens arranged annularly surrounding the second zone, 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, the third comparison being a comparison between a third optical function of the contact lens calculated over the entire third zone of the contact lens and a third target optical function, the third zone being included at the junction of the first zone, the second zone, and the third zone and including at least one micro-optical element of the third zone, and the final lens design of the contact lens also being based on the value of the at least one optical characteristic of the micro-optical element determined for the third zone. Further includes:

[0012] Determining the value of the at least one optical characteristic of the at least one micro-optical element in the third zone is performed after determining the value of the at least one optical characteristic of the at least one micro-optical element in the second zone.

[0013] 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.

[0014] 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.

[0015] According to one embodiment, the first target optical function and the second target optical function are the same.

[0016] According to one embodiment, the first target optical function and the second target optical function are different.

[0017] According to one embodiment, the first optical function and / or the second optical function are calculated for spatial frequencies comprised 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.

[0018] According to one embodiment, the at least one optical feature of the at least one micro-optical element of the first zone and the at least one optical feature of the at least one micro-optical element of the second zone comprise at least one of the following:

[0019] - refractive power, - geometric shapes, - refractive, diffractive or diffusive optical functions, - focal length, - diameter, - Location.

[0020] Advantageously, at least one micro-optical element in the first zone has a circular contour and a diameter of at least one micro-optical element in the first zone is between 0.3 millimeters and 2 millimeters, and / or at least one micro-optical element in the second zone has a circular contour and a diameter of at least one micro-optical element in the second zone is between 0.3 millimeters and 2 millimeters.

[0021] Advantageously, the refractive power of at least one micro-optical element of the first zone is 1 diopter (m -1 ) to 10 diopters, and / or the refractive power of at least one micro-optical element of the second zone is between 1 diopter and 10 diopters.

[0022] According to one embodiment, the first zone comprises a plurality of micro-optical elements, and the at least one optical characteristic of the first zone comprises a density of the micro-optical elements across the first zone or a number of micro-optical elements in the first zone; and / or The second zone includes a plurality of micro-optical elements, and the at least one optical characteristic of the first zone includes a density of the micro-optical elements across the second zone or a number of micro-optical elements in the second zone.

[0023] According to one embodiment, the first zone includes at least one subzone that does not include any micro-optical elements, and the at least one subzone of the first zone covers at least 10 percent of the first zone, and / or the second zone includes at least one subzone that does not include any micro-optical elements, and the at least one subzone of the second zone covers at least 10 percent of the second zone.

[0024] According to one embodiment, determining the value of at least one optical characteristic of at least one micro-optical element of the first zone and the second zone comprises an iterative optimization process comprising:

[0025] - modifying at least one optical characteristic of at least one micro-optical element; - checking whether a given comparison meets a criterion; - If the criteria are not met, repeat the process of correcting and checking.

[0026] According to one embodiment, the criteria is at least one of the following:

[0027] - a minimum quadratic deviation between the first optical function and the first target function; - a minimum quadratic deviation between the second optical function and the second target function; - the minimum of a particular cost function, - ranges of values ​​of the first and second target optical functions; - Threshold.

[0028] Typically, the iterative optimization process includes, in addition to the criterion, a stopping criterion corresponding to the iteration number, said stopping criterion being configured to stop the iterative optimization process when the current iteration reaches the iteration number.

[0029] According to one embodiment, the method includes a preliminary step of defining a macro-optical design for the contact lens that provides a macro-optical function having at least a spherical refractive power.

[0030] The following description, with reference to the accompanying drawings, will clarify what constitutes the present invention and how it can be achieved. The present invention is not limited to the embodiments shown in the drawings. Therefore, when features recited in a claim are followed by reference signs, it will be understood that such signs are included solely for the purpose of improving the understanding of the claim and do not limit the scope of the claim. [Brief explanation of the drawings]

[0031] [Figure 1] 1 shows an example of a contact lens according to the present disclosure placed on a wearer's eye. [Figure 2] 1 is a schematic axial cross-sectional view of a contact lens according to the present disclosure. [Figure 3] 1 is a front view of a first example of a contact lens according to the present disclosure as projected onto a facial plane perpendicular to the major axis of the contact lens. [Figure 4] 1 is a schematic front view of a second example of a contact lens according to the present disclosure as projected onto a facial plane perpendicular to the major axis of the contact lens. [Figure 5] 5 is a schematic front view of an example of an arrangement of micro-optical elements in the second zone of the third example contact lens shown in FIG. 4. [Figure 6] 5 is a schematic front view of another example of the arrangement of micro-optical elements in the second zone of the third example of the contact lens shown in FIG. 4. [Figure 7] 1 is a schematic front view of a third example of a contact lens according to the present disclosure as projected onto a facial plane perpendicular to the major axis of the contact lens. [Figure 8] 1 is a schematic front view of a fourth example of a contact lens according to the present disclosure as projected onto a facial plane perpendicular to the major axis of the contact lens. [Figure 9] 1 is a schematic front view of a fifth example of a contact lens according to the present disclosure as projected onto a facial plane perpendicular to the major axis of the contact lens. [Figure 10]1 is a schematic front view of a sixth example of a contact lens according to the present disclosure as projected onto a facial plane perpendicular to the major axis of the contact lens. [Figure 11] 10 is a schematic front view of a seventh example of a contact lens according to the present disclosure as projected onto a facial plane perpendicular to the major axis of the contact lens. [Figure 12] 1 illustrates a first embodiment of a method according to the present disclosure. [Figure 13] 2 illustrates a second embodiment of the method according to the present disclosure. [Figure 14] 1 illustrates a graphical representation of an example of a target optical function according to the present disclosure. [Figure 15] 12 shows a graphical representation of example first, second and third optical functions obtained with the lens design shown in FIG. 11 . [Figure 16] 12 shows a graphical representation of two examples of a third optical function obtained by the lens design shown in FIG. 10 and the lens design shown in FIG. 11. DETAILED DESCRIPTION OF THE INVENTION

[0032] In this disclosure, including the claims, the verb "to comprise" is to be interpreted in an inclusive sense.

[0033] As shown in FIG. 1, contact lens 10 is intended to be placed on a wearer's eye E, for example, the wearer's left or right eye.

[0034] The wearer may wear another contact lens on their other eye, preferably having a design according to the present disclosure, defined similarly to the one of contact lens 10.

[0035] 1 and 2, contact lens 10 presents a general shape of revolution about a principal visual axis A passing through the center or apex V of a convex anterior surface 11. Contact lens 10 has a concave posterior surface 12 intended to contact the cornea CO of eye E.

[0036] The contact lens 10 has an optical design that includes macro-optical and micro-optical components.

[0037] The macro-optical component of the optical design (or "macro-optical design") provides a macro-optical function that provides at least one overall refractive power across most or all of the useful radial width of the contact lens, providing the wearer's eye with a refractive correction tailored to the wearer's refractive needs under wear conditions. For example, this macro-optical function is provided by the geometry of the anterior surface 11 or posterior surface 12, or both, typically by tailoring the radius of curvature of one or both surfaces of the lens. The refractive power of the contact lens can be, for example, between -20 diopters and +20 diopters, typically between -10 diopters and +10 diopters.

[0038] The refractive power provided by the macro-optical design includes at least a spherical power, and may also include a cylindrical power, a prismatic power, depending on the wearer's (or subject's or individual's) corrective needs as determined by an eye care professional to correct the wearer's (or subject's or individual's) vision defects. For example, a prescription for a wearer with refractive error will include a refractive power value and values ​​for astigmatism, including cylinder and axis, for distance and / or near vision.

[0039] Thus, contact lens 10 may be a corrective contact lens.

[0040] The wearing condition is to be understood as the position of the contact lens on the wearer's eye. The wearing condition is achieved when the contact lens is placed on the cornea CO of the wearer's eye E and the apex 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 main visual axis A of the contact lens.

[0041] The micro-optical component of the optical design (or "micro-optical design") of a contact lens is made up of several micro-optical elements 13, 14 arranged on at least one of the front and back surfaces of the lens, preferably the convex front surface.

[0042] Each micro-optical element has its own optical function and has a small dimension of less than 2 mm, preferably less than 1 mm. Each micro-optical element is, for example, a microlens, a pyramidal Fresnel lens, a prism, a diffuser, a beam splitter, or a diffraction grating. Micro-optical elements are typically formed by photolithography, holography, molding, machining, or encapsulation. In Figure 2, the micro-optical element is a microlens and therefore exhibits a circular outline.

[0043] This arrangement of micro-optical elements provides a micro-optical function that is distinct from and complementary to the macro-optical function. Thus, the overall optical function of a contact lens is the addition of its macro-optical function and its micro-optical function, provided respectively by the macro-optical and micro-optical components of its optical design. The micro-optical function of a contact lens is the optical function provided by the contact lens without its macro-optical design, i.e., without any overall refractive power across most or all of the useful radial width of the contact lens. The macro-optical function of a contact lens is the optical function provided by the contact lens without its macro-optical design, i.e., without any micro-optical elements.

[0044] In the example shown in FIG. 2, the micro-optical element 13 is disposed on the anterior surface 11 of the contact lens 10 .

[0045] Alternatively, at least some or all of the micro-optical elements 13 are disposed on the posterior surface 12 of the contact lens 10 .

[0046] Further alternatively, at least some or all of the micro-optical elements 13 are disposed between the anterior surface 11 and the posterior surface 12 of the contact lens 10 .

[0047] Further alternatively, at least some 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 anterior surface 11 and posterior surface 12 of the contact lens 10 .

[0048] In a variant, at least some or all of the micro-optical elements 13 are formed by lamination onto at least one of the anterior surface 11 and the posterior surface 12 of the contact lens 10 .

[0049] As shown in Figures 3-4 and 7-11, the contact lens includes at least two different zones in which the micro-optical elements are arranged. Specifically, the micro-optical elements in one of the two different zones may be arranged differently from the micro-optical elements in another of the two different zones. The term "zone" refers to a portion of the contact lens. The zones are depicted or defined in the same projection plane, perpendicular to the major axis A of the contact lens. As a result, when comparing a zone of the contact lens with another zone of the contact lens, the two zones are depicted or defined in the same projection plane, without taking into account the curvature of the contact lens.

[0050] Each of the zones of the contact lens contains an arrangement of several micro-optical elements.

[0051] 12 illustrates a first example of a method 100 according to the present disclosure. The method 100 is a method for designing contact lenses 10, 30, 40, 50, 60 as shown in FIGS.

[0052] The method 100 first includes a step 110 of defining a preliminary lens optical design for the corrective contact lens 10 , 30 , 40 , 50 , 60 .

[0053] The method 100 further comprises steps 120, 130 of determining the value of at least one optical characteristic of the micro-optical elements 13 superimposed on the contacts 10, 30, 40, 50, 60 for different zones of the contact lens.

[0054] The method 100 further includes the step 140 of providing a final lens design for the contact lens 10 , 30 , 40 , 50 , 60 .

[0055] The contact lenses are then manufactured according to this final optical design.

[0056] The method is implemented by a computer. The computer may be a processor, a computing module, or a calculator or computing unit. Typically, a computer includes a processor, a memory, and different input and output interfaces. The defining step 110, the determining step 120, the determining step 130, and the providing step 140 (and the determining step 210 in FIG. 13) may be performed by a single computing module, or they may be performed by separate computing modules that communicate with each other directly or via a network link.

[0057] In the defining step 110, the preliminary lens optical design is adapted to provide the above-mentioned macro-optical functions of a contact lens 10, 30, 40, 50, 60 having a predetermined refractive power. For example, the preliminary lens optical design includes the geometry of the anterior or posterior surface or both, typically the radius of curvature of one or both surfaces.

[0058] The preliminary lens optical design also includes:

[0059] - the location and size of the different zones of the contact lens; - the optical design of the micro-optical elements contained in each zone; - the initial number of micro-optical elements in each zone; - initial values ​​of one or more optical characteristics of the micro-optical elements of each of the following zones: - refractive power, - the geometric shape, i.e. the shape of the surface of the micro-optical element, - refractive, diffractive or diffusive optical functions, - focal length, - diameter or size, - Location.

[0060] In the non-limiting example shown in Figure 3, the contact lens 10 is divided into two zones: an annular disc-shaped first zone 15 and an annular disc-shaped second zone 16.

[0061] In a defining step 110, the sizes of the first and second zones are defined.

[0062] In the example shown in FIG. 3 , first zone 15 begins at the ophthalmic lens optical apex V of contact lens 10 and is bounded by a circular contour 17. First zone 15 may include at least one subzone 18 bounded by a circular contour 19. This subzone 18 is devoid of micro-optical elements and covers at least 10 percent of first zone 15. For example, subzone 18 has a diameter of 2 millimeters and is centered on the ophthalmic lens optical apex V of contact lens 10. Such a feature allows the wearer's visual acuity to be maintained when the wearer's pupils are small, typically obtained in high light conditions (i.e., outdoor conditions where the myopia control provided by micro-lenses is not necessary).

[0063] 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 a 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.

[0064] In a non-limiting example, the outer circular contour 17 of the first zone 15 exhibits a diameter of 2.00 millimeters to 5 millimeters (e.g., including any value between 2.00 millimeters and 5.00 mm, in particular 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 2 to 4 millimeters.

[0065] Preferably, the inner circular contour of the second zone 16 presents a diameter of between 2.00 millimeters and 5 millimeters (e.g., including any value between 2.00 millimeters and 5.00 millimeters, 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 millimeters and 4 millimeters. Preferably, the outer contour (i.e., outer edge 20) of second zone 16 is between 4.00 millimeters and 10 millimeters (e.g., any value between 4.00 millimeters and 10.00 millimeters, e.g., 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, The diameter of the sphere may be any of the following values: 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 millimeters and 8 millimeters.

[0066] The contact lens 10 has a first region and a second region. The first region is contained within the first zone 15 and includes some or all of the micro-optical elements 13 of the first zone (in this example, all of the micro-optical elements 13 of the first zone 15). In this example, the first region of the contact lens 10 is bounded by an outer contour that coincides with the contour 17 that bounds the first zone 15. This means that the first region also includes a sub-zone 18 that does not include micro-optical elements. The second region is contained at the junction of the first zone 15 and the second zone 16 and includes some or all of the micro-optical elements 14 of the second zone 16 (here, all of the micro-optical elements 14 of 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 the first zone 15 and the second zone 16. In this example, the second region includes the entire contact lens 10 .

[0067] In a non-limiting example, the outer contour of second zone 16 (and thus outer edge 20 of contact lens 10) exhibits a diameter of 10.00 millimeters. The inner contour of second zone 16 and the outer contour of first zone 15, contour 17, exhibits a diameter of 4.00 millimeters.

[0068] Defining the first and second zones 15, 16 having different sizes allows for variations in pupil size of the wearer's eye E to be taken into account. As a result, the method 100 provides a corrective lens having an optical lens design determined by taking into account variations in pupil diameter. The method 100 provides a corrective contact lens 10 with a better trade-off between visual acuity and myopia control effectiveness, e.g., visual discomfort caused by micro-optical elements that achieve myopia control effectiveness, e.g., slowing myopia progression.

[0069] The second zone 16 includes a subzone 21 that is devoid of micro-optical elements and covers at least 10 percent of the second zone 16. For example, the subzone 21 has an annular disk shape, with an inner contour having a diameter of 4 millimeters and an outer contour 22 having a diameter of 6 millimeters. In this example, the subzone 21 of the second zone 16 is centered on the apex V of the contact lens 10. Such a feature allows the second zone 12 to maintain the wearer's vision. The subzone 21 shown in FIG. 3 ensures that the micro-optical elements 13 of the first zone do not contact the micro-optical elements of the second zone 16.

[0070] The micro-optical elements 13 of the first zone 15 have a diameter d, when projected onto the facial plane (perpendicular to the major axis of the contact lens), fixed at 0.3 mm to 2 mm (e.g., any value between 0.3 mm and 2.0 mm, including any value of 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, and 2.00). 15 The diameter d of the micro-optical element 14 in the second zone 16 16 has a size that, when projected onto the facial plane, is fixed at 0.3 millimeters to 2 millimeters (e.g., any value between 0.3 millimeters and 2.0 millimeters, including any value of 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, and 2.00). The diameter of the micro-optical element may depend on the type of micro-optical element (refractive monofocal or bifocal, spherical or aspherical or toric, diffractive or pyramidal Fresnel). Examples of diameter determination can be found in EP 3923061 A1, WO 2021 / 198362, WO 2019 / 206569 A1 and WO 2019166653 A1.

[0071] The micro-optical elements 13 in the first zone 15 may be configured to have a spherical power of 1 to 20 diopters, preferably 1 to 10 diopters, and the micro-optical elements 14 in the second zone 16 are configured to have a spherical power of 1 to 20 diopters, preferably 1 to 10 diopters.

[0072] The micro-optical elements 13 in the first zone 15 are defined to have a surface shape, for example, a prismatic or spherical or aspherical or toroidal surface shape, and the micro-optical elements 14 in the second zone 16 are defined to have a surface shape, for example, a prismatic or spherical or aspherical or toroidal surface shape.

[0073] Each refractive micro-optical element 13, 14 can be a monofocal or bifocal micro-optical element.

[0074] Each diffractive micro-optical element 13, 14 includes, for example, a diffractive pi Fresnel micro-lens. The diffractive pi Fresnel micro-lens has a phase function that exhibits a π phase jump at a nominal wavelength λ. The wavelength λ is preferably 550 nm for human eye vision applications. The diffractive pi Fresnel micro-lens exhibits an optical axis that passes through the optical center of the micro-lens. A micro-lens having a diffractive pi Fresnel micro-optical element diffracts light primarily in two diffraction orders associated with two refractive powers P0(λ0) and P1(λ0). Thus, upon receiving collimated light, the micro-lens focuses the light onto two distinct regions on its axis.

[0075] For example, the refractive power P0(λ0) may be within a range of + / −0.12 diopters in addition to the sphere of the predetermined refractive power of the contact lens 10, derived for example from the wearer's prescription.

[0076] According to one embodiment, the refractive power P1(λ0) is comprised between an absolute value of 1 diopter (i.e., ±1 diopter) and 10 diopters (i.e., ±10 diopters). Preferably, the refractive power P1(λ0) is comprised between an absolute value of ±2 diopters and an absolute value of ±6 diopters.

[0077] Alternatively, each diffractive micro-optical element 13, 14 may include a diffusive micro-optical element that scatters light. For example, collimated light may be scattered in a cone having an apex angle ranging from ±1° to ±40°. In one example, the diffusive micro-optical element is adapted to scatter light locally, i.e., at the intersection point between a given micro-optical element and the wavefront reaching the given micro-optical element. Micro-optical elements with diffusive optical functionality may be similar to the micro-optical elements described in U.S. Pat. No. 10,302,962.

[0078] Additionally, 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 contained in the face plane of projection (perpendicular to the major axis of the contact lens) and define a position across the field of view through the contact lens. The third spatial axis z coincides with the major visual axis A of the contact lens and gives a position along this axis (i.e., related to the distance to the eye). This three-dimensional spatial coordinate system (x, y, z) has an origin O located on the ocular vertex V of the anterior surface of the contact lens. The values ​​of the three-dimensional spatial coordinates (x, y, z) of each micro-optical element make it possible to define where the micro-optical element is located within the field of view of the contact lens and whether the micro-optical element is located on the anterior or posterior surface of the contact lens, or embedded within the thickness of the contact lens. Typically, the micro-optical element is located on the posterior surface of the contact lens, on the anterior surface of the contact lens, or within the depth of the contact lens.

[0079] In the defining step 110, if several micro-optical elements 13, 14 are defined in the first zone 15 and / or the second zone 16, the optical characteristics comprise the density or number of the micro-optical elements. The density of the micro-optical elements on a zone may be defined as the ratio of the total surface of the micro-optical elements to the area of ​​the zone. Thus, in the example shown in Figure 3, the density or number of the micro-optical elements is set in the defining step 110. Preferably, the density is selected such that the micro-optical elements 13 cover 20-80 percent of the first zone 15 (e.g., any value between 20 percent and 80 percent, including any of the values ​​20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, and 80), while the density is selected such that the micro-optical elements 14 cover 20-80 percent of the second zone 16 (e.g., any value between 20 percent and 80 percent, including any of the values ​​20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, and 80). For example, in defining step 110, the first zone 15 includes five micro-optical elements 13, and the second zone 16 includes 12 micro-optical elements 14. If the first zone 15 and / or the second zone 16 includes several micro-optical elements, each optical element in the first zone 15 and / or the second zone 16 is spaced at least 0.5 millimeters from an adjacent micro-optical element. In addition, the first zone 15 and / or the second zone 16 may be spaced less than 5.0 millimeters from an adjacent micro-optical element. For example, one edge of the micro-optical element 13, 14 included in the first zone 15 or the second zone 16 is spaced 1 millimeter from the edge of the adjacent optical element.

[0080] Some micro-optical elements in one zone may touch some micro-optical elements in another zone (see FIG. 4). Thus, each micro-optical element in the first zone 15 is spaced from an adjacent micro-optical element in the second zone 16 by 0 to 2 millimeters (e.g., any value between 0.00 millimeters and 2.0 millimeters, including 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 spacing may be defined from edge to edge or by using the optical center (geometric center) or optical axis of the micro-optical element. If the space between two adjacent micro-optical elements is 0.00 mm, this means that the micro-optical elements (eg, consecutive micro-optical elements) touch each other.

[0081] In a preferred embodiment, the optical characteristics of all micro-optical elements 13 in the first zone 15 have the same values, and the optical characteristics of all micro-optical elements 14 in the second zone 16 have the same values. For example, in the defining step 110, the micro-optical elements 13 in the first zone 15 are refractive micro-lenses with a diameter of 1 millimeter and a refractive power of 4 diopters, and the micro-optical elements 14 in the second zone 16 are refractive micro-lenses with a diameter of 1 millimeter and a refractive power of 4 diopters.

[0082] In another embodiment, the micro-optical elements 13 in the first zone 15 each have at least one optical characteristic whose value varies from one micro-optical element 13 in the first zone 15 to another, and the micro-optical elements 14 in the second zone 16 each have at least one optical characteristic whose value varies from one micro-optical element 14 in the second zone 16 to another. For example, some micro-optical elements 14 in the second zone 16 have a spherical power of 4 diopters, while other micro-optical elements 14 in the second zone 16 have a spherical power of 2 diopters. The optical characteristics of the micro-optical elements 13, 14 included in the first and second zones are defined in the defining step 110.

[0083] In a non-limiting example, the micro-optical elements 13 in the first zone 15 have optical characteristics adapted to provide a first myopia suppression function, and the micro-optical elements 14 in the second zone 16 have optical characteristics adapted to provide a second myopia suppression function for the wearer's myopia. Typically, the first and second myopia suppression functions are each achieved by the micro-optical functions provided by the micro-optical elements in a given zone.

[0084] Such an embodiment provides a contact lens 10 that allows for control of both myopia progression and wearer discomfort.

[0085] For example, the first myopia suppression function depends on the optical characteristics of the micro-optical elements 13 included in the first zone 15, and the second myopia suppression function depends on the optical characteristics of the micro-optical elements 14 included in the second zone 16, depending on the number or density of the micro-optical elements, the refractive power, the focal length of the micro-optical elements, the diffusive or refractive or refractive optical function of the micro-optical elements, the space between adjacent micro-optical elements, etc.

[0086] For this purpose, the micro-optical elements 13 of the first zone 15 have optical characteristics adapted to provide a particular spatial distribution of blur, and the micro-optical elements 14 of the second zone 16 have optical characteristics adapted to provide another spatial distribution of blur different from that provided by the micro-optical elements 13 of the first zone 15, if these micro-optical elements have a diffractive optical function. The spatial distribution of blur is also called the defocus effect.

[0087] In one variant, if the micro-optical elements provide a diffusing or diffractive optical function, the light entering the wearer's eye E is scattered (e.g., not focused). Due to the first and second myopia suppression functions, the light beam (made up of light rays) passing through the first zone 15 and the second zone 16 of the contact lens 10 is separated into two parts:

[0088] a first portion corresponding to light rays that are polarized by the macro-optical components of the contact lens 10 and that are not affected by the arrangement of micro-optical elements of a given zone. Typically, the first portion corresponds to light rays that do not pass through one of the micro-optical elements of the arrangement of micro-optical elements that belongs to a given zone.

[0089] a second part corresponding to the light rays affected by the micro-optical components (i.e. the arrangement of micro-optical elements) and by the macro-optical components of the contact lens 10;

[0090] Typically, the second portion of the light beam is called the myopia suppression signal.

[0091] The myopia suppression signal depends on the characteristics of the micro-optical element, and here is based on a given myopia suppression function (first or second myopia suppression function). Typically, the myopia suppression signal depends on the refractive, diffractive or diffusive optical function of the micro-optical element. For this purpose, the myopia suppression signal is: If the micro-optical element has a diffusing function, it is a diffuse signal. As mentioned above, a diffuse signal corresponds to an unfocused signal, typically a scattered signal.

[0092] - Diffraction signal if the micro-optical element has a diffusing function. As mentioned above, the diffraction signal corresponds to an unfocused signal, typically a scattered signal.

[0093] If the micro-optical element has a diffusing function (defocusing effect), it is a refractive signal.

[0094] 1 shows a first myopia suppression signal provided by the micro-optical elements included in the first zone 15 and a second myopia suppression signal (defocus effect) provided by the micro-optical elements included in the second zone 16. Light rays 23 of the first myopia suppression signal and light rays 24 of the second myopia suppression signal entering the wearer's eye E are focused in front of the surface of the retina RE onto 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, which provides a predetermined refractive power for the eye's refractive correction, focuses light rays entering the eye onto the retinal surface of the retina RE of the eye.

[0095] The first myopia control function may be the same as the second myopia control function. The first myopia control function and the second myopia control function are the same, allowing for a uniform balance between visual acuity and myopia control performance for pupils of different sizes. The first myopia control function may be different from the second myopia control function. This allows for a uniform balance between visual acuity and myopia control performance depending on the pupil size.

[0096] In one embodiment, the micro-optical elements 13, 14 include micro-lenses that provide a refractive power that is different from the refractive power of the macro-optical components of the contact lens 10. In other embodiments, the micro-optical elements 13, 14 may provide a diffractive or diffusive micro-optical function, as described above.

[0097] After defining the preliminary lens optical design for the contact lens 10, the method performs a step 120 of determining the value of at least one characteristic of the micro-optical elements 13 comprised 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. This first optical function is then compared to a first target optical function.

[0098] Similarly, after defining the preliminary lens optical design for the contact lens 10, the method performs a step 130 of determining the value of at least one characteristic of the micro-optical elements 14 contained 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. This second optical function is then compared to a second target optical function.

[0099] Different optical characteristics or only one optical characteristic is determined for the micro-optical elements 13, 14 in determining steps 120, 130. In the present disclosure, the method 100 begins by determining one optical characteristic of the micro-optical elements in a given region. The determining steps 120, 130 are performed sequentially, where step 120 of determining the value of the optical characteristic of the micro-optical elements 13 in the first zone 15 is performed before step 130 of determining the value of the optical characteristic of the micro-optical elements 14 in the second zone 16.

[0100] Thus, the determining step 130 takes into account the optical characteristics of the micro-optical elements determined in the previous step 120. As a result, in step 130, only the optical characteristics of the micro-optical elements 14 located in the second zone 16 are determined. This technical feature improves the accuracy of the determination of the values ​​of the optical characteristics of the micro-optical elements and takes into account possible variations in pupil size during design, thereby providing a way to achieve a trade-off between the performance of the myopia prevention function and the visual accuracy obtained with a contact lens when designed using method 100. In addition, the determining steps 120, 130 are easier to implement and less time consuming.

[0101] "Optical function" means a function that allows quantifying the quality of the optical design of a contact lens as a whole or as a specific region or zone of the optical design of a contact lens.

[0102] Typically, the first optical function and the second target optical function and the first and second target optical function, respectively, are based on:

[0103] - a point spread function that gives the degree of spreading (blurring) of the image of a point object over the considered area of ​​the contact lens. The point spread function makes it possible to reveal the image of a point seen through the contact lens. In the present disclosure, the point spread function is typically an ideal Gaussian (M 2 The point spread function is estimated by simulations known to those skilled in the art using a temporal light source emitting light in the monochromatic or polychromatic visible spectrum from 400 nm to 780 nm (λ) in the form of λ = 1. 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) defined as P(x, y) = A(x, y) exp(ikW(x, y)), placed in the plane of the preliminary design of the contact lens on which the micro-optical elements 13, 14 are arranged, where k is the wave number (2π / λ), λ is the wavelength of the temporal light source, preferably equal to 550 nm, an apodization function equal to 1, and W(x, y) corresponds to the optical path difference provided by the contact lens.

[0104] - a modulation transfer function giving the percentage of contrast transmitted over the considered area of ​​the contact lens as a function of spatial frequency (expressed as cycles per degree). The use of modulation transfer functions in the method according to the present disclosure is illustrated on Figures 14 to 16.

[0105] The modulation transfer function according to the present disclosure can be calculated over different specific zones of the optical design of the contact lens by spatially scanning the field of view of the contact lens 10 using simulated apertures that can be defined for several central gaze directions. Typically, a point spread function (PSF), which gives the degree of spread (blurring) of an image of a point object throughout the considered portion of the contact lens (defined by the aperture), is calculated as described above. The modulation transfer function is then calculated based on the Fourier transform of the calculated point spread function.

[0106] For example, the first optical function, the second optical function and the first and second target optical functions may be functions as defined in the document "Accuracy and precision of objective refraction from wavefront aberrations", doi:10.1167 / 4.4.9.

[0107] According to one example, the first and second target optical features are the same target feature within a tolerance of less than 10 percent for the first and second zones. This embodiment provides an easier and less time consuming method to implement.

[0108] Additionally, modulation transfer functions according to the present disclosure may be calculated for spatial frequencies between 1 and 30 cycles per degree. In variations, modulation transfer functions according to the present disclosure may be calculated for a particular range of spatial frequencies, for example, between 1 and 5 cycles per degree (e.g., any value between 1.00 and 5.00 cycles per degree, including any value of 1.00, 2.00, 3.00, 4.00, 5.00), and / or between 5 and 20 cycles per degree (e.g., any value between 5.00 and 20.00 cycles per degree, including any value of 5.00, 6.00, 7.00, 8.00, 9.00, 10.00, 11.00, 12.00). The spatial frequencies may be calculated for spatial frequencies comprised of 0, 13.00, 14.00, 15.00, 16.00, 17.00, 18.00, 19.00, and 20.00 cycles per degree, and / or 20-30 cycles per degree (e.g., any value between 20.00 and 30.00 cycles per degree, e.g., any value between 20.00 and 30.00 cycles per degree, e.g., 20.00, 21.00, 22.00, 23.00, 24.00, 25.00, 26.00, 27.00, 28.00, 29.00, and 30.00 cycles per degree). Typically, selection of a particular range of spatial frequencies allows the optical design of a contact lens to be optimized for a particular visual task, such as reading. Typically, low spatial frequencies (i.e., below 10 cycles per degree) allow readers to see words, the coarse morphology of words and lines very quickly, while high spatial frequencies allow readers to see the fine details of words, such as the precise morphology and position of letters, which are used to access the meaning of words and sentences.

[0109] 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 characteristics of the micro-optical elements in different zones. This embodiment allows for better adaptation of the contact lens to various situations, such as indoor or outdoor environments, distance or near vision activities. In fact, during near vision activities, the size of the wearer's pupil is different (generally larger) than during distance vision activities. Contact lenses designed using this embodiment can help to be more efficient in both cases.

[0110] Optionally, determining 120 includes defining a first target optical function, and determining 130 includes defining a second target optical function. The first and second target optical functions may be, for example, modulation transfer functions (MTFs) having predetermined values ​​each related to a spatial frequency. The values ​​are selected according to visual acuity needs and the level of myopia suppression required. Generally, low spatial frequencies will affect the level of myopia suppression, and high spatial frequencies will affect visual acuity.

[0111] 12, the first and second optical functions and the first and second target optical functions are modulation transfer functions. Thus, in determining step 120, the computer compares (in a first comparison) values ​​of the first modulation transfer function to values ​​of the first target optical function over at least one range of spatial frequencies, for example, 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. Similarly, in determining step 120, the computer compares (in a second comparison) values ​​of the second modulation transfer function to values ​​of the second target optical function across at least one range of spatial frequencies, for example, 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 a preferred embodiment, in determining steps 120, 130, the first and second comparisons are performed within each spatial frequency between 0 and 5 cycles per degree and 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, respectively. The first comparison and the second comparison are preferably performed for spatial frequencies comprised 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, as these ranges of spatial frequencies correspond to spatial frequencies involved in reading activities.

[0112] According to one embodiment, the steps 120, 130 of determining the values ​​of the optical characteristics of the micro-optical elements of the zones comprise an iterative optimization process, each comprising the following steps:

[0113] - modifying the optical characteristics 121, 131 of the micro-optical elements 13, 14; - checking whether the first comparison or the second comparison satisfies a criterion 122, 132; If the criteria are not met, repeat the correcting steps 121, 131 and checking steps 122, 132.

[0114] The iterative optimization process in this disclosure is an iterative loop in which an optimization method, such as gradient descent or Newton's algorithm, is used to find the optical characteristics of the micro-optical elements 13, 14 that meet the criteria defined in the iterative optimization process.

[0115] In the modifying steps 121, 131, the value of the optical characteristic defined in the defining step is modified to another value of the optical characteristic. For example, the optical characteristic is modified in defined steps, for example by decreasing or increasing the value of the optical characteristic in steps of 0.5. In some embodiments, the step can be modified during the process, for example by randomly generating an initial step and modifying it during the method. In another embodiment, the step of modifying the optical characteristic can be determined automatically by programming a gradient descent method or Newton's algorithm in this way. This makes it possible to find the optimal values ​​of the majority of the optical characteristics of the micro-optical elements of the first zone 11 and the second zone 12.

[0116] The optical characteristics of the modified micro-optical elements 13, 14 are one of the following: refractive power, refractive, diffractive or diffractive optical function, focal length, diameter or size, position of the micro-optical elements 13, 14. Additionally, since the contact lens 10 shown in Figure 3 includes several 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 modifying steps 121, 131.

[0117] In step 120 of determining, the diameter of the micro-optical elements 13 in the first zone 15 is selected from 0.3 millimeters to 2 millimeters (e.g., any value between 0.3 millimeters and 2.0 millimeters, including any value of 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 of the micro-optical elements 14 in the second zone 16 is selected from 0.3 millimeters to 2 millimeters (e.g., any value between 0.3 millimeters and 2.0 millimeters, including any value of 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). 16 is selected from 0.3 mm to 2 mm (e.g., any value between 0.3 mm and 2.0 mm, including 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, and 2.00). The micro-optical elements 13 in the first zone 15 are defined to have a spherical power between 1 diopter and 20 diopters, preferably between 1 diopter and 10 diopters, and the micro-optical elements 14 in the second zone 16 are defined to have a spherical power between 1 diopter and 20 diopters, preferably between 1 diopter and 10 diopters.

[0118] In addition, the surface shape of the micro-optical elements located in each zone can be changed to spherical, aspherical, toroidal or atric surface shapes, for example, refractive optical functions can be changed to diffractive optical functions and vice versa.

[0119] 3, the refractive power of the micro-optical elements 13 is selected as the optimized optical characteristic for the first zone 15, and the diameter of the micro-optical elements 14 is selected as the optimized optical characteristic 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.

[0120] In the checking steps 122, 132, the criterion to be met may be the minimum quadratic deviation (e.g., the sum of squared deviations) between the first optical function and the first target feature and / or the minimum quadratic deviation between the second optical function and the second target feature, or the minimum value of a specific cost function, or the values ​​or range of values ​​of the first and second target optical functions, or a threshold, etc. If the criterion for the first zone 15 is the minimum quadratic deviation between the first optical function and the first target feature, the optical characteristics of the micro-optical elements 13 included in the first region are calculated (i.e., modified) to minimize the quadratic deviation between the first optical function and the first target feature. Similarly, if the criterion for the second zone 16 is the minimum quadratic deviation between the second optical function and the second target feature, the optical characteristics of the micro-optical elements 13, 14 included in the second region are calculated (i.e., modified) to minimize the quadratic deviation between the second optical function and the second target feature. In a non-limiting example method, the deviation may be the root mean square deviation. 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 consecutive iterations is lower than a predetermined threshold), a minimum is detected. In that case, the iterative optimization process of the embodiment ends. The same applies to the deviation between the second optical function and the second target function.

[0121] In another embodiment, the criterion is a particular cost function, which may be based on an integral of the modulation transfer function value and an integral of the target modulation transfer function value.

[0122] If the criterion for the first and second zones is the minimum value of a particular cost function, then the optical characteristics of the micro-optical elements 13 contained in the first region and the optical characteristics of the micro-optical elements 14 contained in the second region, respectively, are calculated (i.e., modified) to minimize this particular cost function. By way of non-limiting example, the iterative optimization process of the above embodiment minimizes the following cost function for the first and / or second region of the contact lens 10 and terminates when the value of the cost function is lower than a given quantity: For the above-described embodiment, the iterative optimization process terminates when the minimization of the cost function no longer changes:

[0123] In another embodiment, the criterion is a range of values ​​of the first target optical function and / or a range of values ​​of the second optical function. In this example, the optical characteristics of the micro-optical elements of each zone are changed until the first and second optical functions respectively exhibit values ​​that are included in the range of values ​​of the first and second target optical functions. If this is not the case, standard stopping criteria for the optimization function (parameter accuracy, cost function accuracy, number of iterations) can be used. In a preferred embodiment, once the first and second target optical functions reach their respective criterion, a new iteration begins (i.e., this means that the optical characteristics are changed) to verify whether better results are obtained with this new optical characteristic. If not, the optical characteristics of the previous iteration are selected to be the optical characteristics of the micro-optical elements 13, 14. The optimization loop can be repeated until the values ​​of the first and second optical functions are equal to the midpoint of the range of values ​​of the first or second target optical function.

[0124] In another embodiment, the criterion is a threshold value, meaning that the determining steps 120, 130 stop when the first and second target optical functions contain values ​​that reach the threshold value.

[0125] Additionally, the optimization process of method 100 may include a stopping criterion corresponding to the number of iterations in addition to the above-mentioned criteria. The stopping criterion corresponds to an additional criterion and is used in conjunction with one of the criteria disclosed above. The stopping criterion allows the iterative optimization process to be stopped if the above-mentioned criterion is not reached, e.g., if a minimum value or threshold value is not reached. As a non-limiting example, when first and second target optical functions are defined, the number of iterations may be set to 10 to 2000 (e.g., 10 to 100). In an embodiment of the iterative optimization process, once the current iteration reaches the set number of iterations, the optimization process terminates even if the above-mentioned criterion is not met.

[0126] In the method 100, the optimization loop of the determining steps 120, 130 is terminated if a criterion is met, for example if the result of the cost function reaches its minimum value (or one of its minimum values) or falls below a predetermined threshold, or if the current iteration reaches a set number of iterations. This means that the determined values ​​of the optical characteristics of the micro-optical elements 13 comprised in the first zone 15 have the values ​​of the optical characteristics given at the end of the checking step 122 of the determining step 120. Similarly, the determined values ​​of the optical characteristics of the micro-optical elements 14 comprised in the second zone 16 have the values ​​of the optical characteristics given at the end of the checking step 132 of the determining step 130.

[0127] If the criteria are not met in checking step 122, a new iteration of determining step 120 is performed, repeating modifying step 121 and checking step 122 of determining step 120. Similarly, if the criteria are not met in checking step 132 of determining step 130, a new iteration of determining step 130 is performed, repeating modifying step 131 and checking step 132 of determining step 130.

[0128] A new iteration is performed from the modifying step 121, 131 of the determining step 120, 130 to the checking step 122, 132, and it is again checked whether the criterion is met. If the criterion is the number of iterations, the loop is iterated until the result of the cost function reaches a minimum, such as in the last iteration, or until the optimization loop reaches a set number of iterations.

[0129] If the number of iterations is set, at the end of the last iteration the optical feature is assigned to be the optical feature provided at the end of the checking step 122, 132 of the determining step 120, 130. More specifically, the optical feature of the determining step 120, 130 has the value selected in the modifying step 121, 131 of the last optimization loop iteration of the determining step 120, 130.

[0130] Preferably, at the end of the checking step 122, the value of the optical feature that provides the smallest quadratic deviation value in the loop is assigned as the value of the optical feature of the micro-optical element 13 comprised in the first zone 15, while at the end of the checking step 132, the value of the optical feature that provides the smallest quadratic deviation value in the loop is assigned as the value of the optical feature of the micro-optical element 14 comprised in the second zone 16. In that case, the loop of the determining steps 120, 130 may stop when the minimum value is reached, even if no number of iterations is set.

[0131] In each determining step 120, 130, if the value of the optical feature cannot reach a criterion, such as the minimum value of the quadratic deviation or the minimum value of the cost function, the determining step 120, 130 is stopped by a set number of iterations. In that case, some optical features are selected by the computer and determined in a new iteration loop of the determining steps 120, 130. In the determining step 120 of this example, only selected optical features (e.g., refractive power) of the micro-optical elements 13 of the first zone 15 are changed. However, for the second zone 16, changing only the diameter value of the micro-optical elements 14 of the second zone 15 was not sufficient to reach the criterion. Therefore, the diameter and refractive power are determined in the determining step.

[0132] The method 100 then includes a step 140 of providing a final lens design for the contact lens 10. In practice, the computer used to implement the method provides output data including the final lens design for the 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 the determining steps 120, 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 the contact lens 10 intended to be worn by a wearer. As a result, it corresponds to the optical design of the contact lens that will be worn on the wearer's eye. Thus, the output data can be used by a computer or other device or computer already used in the manufacture of contact lenses.

[0133] The final lens design of the contact lens is then used to manufacture a contact lens 10 that is intended to be worn by a wearer to facilitate improvement of the wearer's vision, where the final lens design of the contact lens 10 becomes the optical design of the contact lens 10 that is manufactured and worn by the wearer.

[0134] At the end of method 100, the micro-optical element 13 shown in FIG. 3 is a refractive micro-lens having a diameter of 1 millimeter, a refractive power of 4 diopters, and a focal length of 1000 millimeters, and the micro-optical element 14 in the second zone 16 is a refractive micro-lens having a diameter of 1 millimeter, a refractive power of 4 diopters, and a focal length of 250 millimeters.

[0135] Figure 4 also shows an example of a contact lens 30 obtained by the method 100. In this embodiment, a first zone 15, a sub-zone 18 of the first zone and a second zone 16 are found, as disclosed in the previous embodiment shown in Figure 3. Therefore, only the differences with respect to the embodiment shown in Figure 3 will be described.

[0136] In this embodiment, the density or number of micro-optical elements 14 in the second zone 16 or the micro-optical elements 13 in the first zone 15 is further selected as the optical feature to be optimized in the determining step 120 or the determining step 130. The number of micro-optical elements in the first zone 14 and the second zone 16 is, for example, comprised between 2 and 10,000 micro-optical elements, for example between 4 and 100 micro-optical elements.

[0137] In particular, the density or number of micro-optical elements, the refractive power and the diameter are selected as the optical characteristics to be determined in the determining steps 120, 130.

[0138] Each determining step 120, 130 is configured to first determine the density or number of micro-optical elements 13, 14 in a given zone of the contact lens 10, then determine the refractive power values ​​of the micro-optical elements, and finally determine the diameter values ​​of the micro-optical elements, which allows for faster results.

[0139] If the values ​​of the density or number of micro-optical elements, the refractive power and diameter of the micro-optical elements cannot reach the criteria defined in the defining steps 120, 130, the computer selects other optical features, such as the position, focal length, geometric shape, refractive, diffusive or diffractive optical function of the micro-optical elements 13, 14. In that case, the determining steps are therefore configured to determine the optical features, for example, in the following order: density or number of micro-optical elements, refractive power or focal length, diameter (or size), position, geometric shape and refractive, diffusive or diffractive optical function of the micro-optical elements 13, 14. It is also possible to determine only some of the optical features from the previous list, the other optical features being selected to predetermined values.

[0140] In the example shown in Figure 4, 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 greater than the number of micro-optical elements 13 included in the first zone 15 of the preliminary lens optical design of the contact lens 10 shown in Figure 3. Other optical characteristics of the micro-optical elements 13 in the first zone 15 shown in Figure 4 are similar to those obtained by the method 100 shown in Figure 3.

[0141] At the end of the loop of determining step 130, each optical element 14 included in the second zone 16 is contiguous with 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 one another. Such a contiguous arrangement of micro-optical elements provides a higher density of micro-optical elements 14 across the second zone 16 of the contact lens 30. For example, the density of the contiguous micro-optical elements 16 included in the second zone 16 is 60 percent or more, or preferably 80 percent or more, on the surface. In this example, the density of the micro-optical elements on the second zone 16 is 100 percent. This means that the micro-optical elements cover the entire area of ​​the second zone 16.

[0142] In a preferred embodiment, as shown in FIG. 4, all of the micro-optical elements 14 in the second zone 16 are identical. This means that all of the micro-optical elements have the same optical characteristics. For example, the micro-optical elements 14 in the second zone 16 shown in FIG. 4 are spherical micro-lenses, each having a diameter of, for example, 1 millimeter and a refractive power of +4 diopters. The micro-optical elements 14 in the second zone 16 shown in FIG. 4 are diffractive micro-optical elements. In FIG. 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 can have a hexagonal pattern as shown in FIG. 5 or a rectangular pattern as shown in FIG. 6.

[0143] In this example, a micro-optical element 13 positioned near the contour 17 of the first zone 15 may contact a micro-optical element 14 positioned near the contour 17 of the first zone 15 .

[0144] 4 shows that, in the method 100, the number of micro-optical elements defined in the defining step 110 can be modified in the determining steps 120, 130, in particular in the modifying steps 121, 131. For example, if only one micro-optical element 13 and / or 14 is defined for the first zone 15 and / or the second zone 16, this number can be increased in the iterative optimization process of the determining steps 120, 130. In another example, if several micro-optical elements 13 and / or 14 are defined for the first zone 15 and / or the second zone 16, the number of micro-optical elements can be increased or decreased in the iterative optimization process of the determining steps 120, 130.

[0145] Figures 7, 8 and 9 show examples of contact lenses 40, 50, 60 obtained by the method 100. In these embodiments, the first zone 15, the sub-zone 18 of the first zone 15 and the second zone 16 are found as disclosed in the previous embodiment shown in Figure 3. Therefore, only the differences with respect to the embodiment shown in Figure 3 will be described.

[0146] In FIG. 7 , the first zone 15 of the contact lens 50 includes micro-optical elements 13 that have the same size, optical function, and focal length but different refractive powers. For example, the micro-optical element numbered 13a has a diopter power of 1 diopter, while the micro-optical element numbered 13b has a diopter power of 4 diopters. Additionally, the second zone 16 of the contact lens 50 includes micro-optical elements 14 that have the same size, optical function, and focal length but different refractive powers. For example, the micro-optical element numbered 14a has a diopter power of 1 diopter, while the micro-optical element numbered 14b has a diopter power of 4 diopters. This means that micro-optical elements included in the same zone may have different refractive powers. Therefore, the determining steps 120 and 130 may be applied to specific micro-optical elements selected or defined by a computer, for example, in the defining step 110. In addition, this also means that at the end of the determining step, micro-optical elements in the same zone may have different optical characteristics.

[0147] FIG. 8 shows another example of a contact lens 60. In this example, a first zone 15 of the contact lens 60 includes micro-optical elements 13 having different sizes. For example, in FIG. 8, the first zone 15 includes two micro-optical elements numbered 13c having a diameter of 2 millimeters and two micro-optical elements numbered 13d having a diameter of 4 millimeters. In addition, a 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 having a diameter of 2 millimeters and five micro-optical elements 14d having a diameter of 4 millimeters.

[0148] 9 shows another example of a contact lens 60 in which the micro-optical elements of the zones are clustered. In some clusters, the micro-optical elements are contiguous. 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.

[0149] In this embodiment, the second zone 16 of the contact lens 60 exhibits 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 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 comprised between the diameter of the micro-optical element and twice the diameter of the micro-optical element.

[0150] Although Figures 7-9 only show contact lenses having two zones, these examples also apply to contact lenses 10 having three or more zones.

[0151] Figure 13 shows a second example of a method 200 according to the present disclosure. The method 200 is a method 200 for designing contact lenses 70, 90 as shown in Figures 10 and 11. The contact lenses 70, 90 are preferably corrective lenses 70, 90.

[0152] 10 and 11, a contact lens 70 includes at least three zones with specifically arranged micro-optical elements, the micro-optical elements being arranged differently in each zone, with each zone of the contact lens including an arrangement of several micro-optical elements.

[0153] Defining the first, second, and third zones allows for greater variation in pupil size of a wearer's eye to be taken into account, as compared to, for example, method 100. As a result, method 200 is improved because the contact lens provided at the end of method 200 has an optical lens design that better accounts for variations in pupil diameter. Method 200 provides a corrective contact lens 10 with a better tradeoff between visual acuity and visual discomfort due to myopia progression inhibition, as compared to method 100.

[0154] The method 200 shown in Figure 13 includes all the steps of the method 100 of Figure 12. Therefore, only the differences from Figure 12 will be described.

[0155] 10, contact lens 70 is divided into three zones: annular disc-shaped first zone 75, annular disc-shaped second zone 76, and annular disc-shaped second zone 86. First zone 75 includes micro-optical element 73 having at least one optical feature, second zone 76 includes micro-optical element 74 having at least one optical feature, and third zone 86 includes micro-optical element 82 having at least one optical feature.

[0156] The optical characteristics of the micro-optical elements 82 in the third zone 86 include at least one of the following optical characteristics: refractive power, geometric shape, refractive diffractive or diffractive optical function, focal length, diameter or size, position.

[0157] First zone 75 is bounded by a circular contour 77 and includes at least one subzone 78 bounded by a circular contour 79. This subzone 78 is devoid of micro-optical elements and covers at least 10 percent of first zone 75. For example, subzone 78 has a diameter of 2 millimeters and is centered on the ophthalmic lens optical apex V of contact lens 70. Such features allow for the wearer's vision to be preserved.

[0158] The first zone 75, the second zone 76, and the third zone 86 are concentric. They are centered on the apex 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 contour 77 and externally by a circular outer contour that coincides with the circular inner contour 80 of the third zone 86. The third zone 86 surrounds the second zone 75 and is bounded internally by the circular contour 80 and externally by a circular outer contour that coincides with the outer edge 81 of the contact lens 70.

[0159] The outer circular contour 77 of the first zone 75 is 4 millimeters in diameter. The inner circular contour of the second zone 76 presents a 4 millimeter diameter.

[0160] The outer circular contour of the second zone 76 presents a diameter between 6.00 millimeters and 8 millimeters. Preferably, the inner circular contour 80 of the third zone 86 presents a diameter between 6.00 millimeters and 8 millimeters (e.g., any value between 6.00 millimeters and 8.00 millimeters, including 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, and 8.00). The outer contour of the third zone 86 (i.e., outer edge 81) has a diameter of between 8 millimeters and 10 millimeters (typically any value between 8.00 mm and 10.00 mm, including, for example, 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).

[0161] The outer circular contour of the second zone is 6 millimeters in diameter, the inner contour of the third zone 86 is 6 millimeters in diameter, and the outer edge 81 is 10 millimeters in diameter.

[0162] The second zone 76 has a width defined by its inner and outer contours that depend, in particular, on the size of the micro-optical elements 74 from the largest micro-optical element 74 in the second zone 76. Similarly, the third zone 86 has a width defined by its inner and outer contours that depend, in particular, on the size of the micro-optical elements 82 from the largest micro-optical element 82 in the third zone 86. Therefore, it is a straightforward procedure to automatically define the sizes of the second and third zones in the defining step 110.

[0163] The contact lens 70 has a first region, a second region, and a third region. The first region is contained within 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 that coincides with the contour 77 that bounds the first zone 75. This means that the first region also includes a sub-zone 78 that does not include micro-optical elements. The second region is contained at the junction 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 76 (in this example, 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 at the junction 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.

[0164] The micro-optical elements 73 , 74 in the first zone 75 and the second zone 76 have the same optical characteristics as the micro-optical elements 14 , 13 described above for the method 100 .

[0165] The micro-optical elements 82 of the third zone 86, when projected onto the facial plane (perpendicular to the major axis of the contact lens 70), have a size d fixed at 0.3 millimeters to 2 millimeters (e.g., any value between 0.3 millimeters and 2.0 millimeters, including any value of 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, and 2.00). 86 (i.e., diameter).

[0166] The micro-optical elements 82 in 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.

[0167] The micro-optical elements 82 in the third zone 86 are defined to have a surface shape, for example, a prismatic or spherical or aspherical or toroidal surface shape.

[0168] Each refractive micro-optical element 82 can be a monofocal or bifocal micro-optical element. Each diffractive micro-optical element 82 comprises, for example, a diffractive bi-Fresnel micro-lens. Alternatively, each diffractive micro-optical element 82 comprises a diffractive micro-optical element that scatters light.

[0169] In the defining step 110 of the method 200, the sizes of the first, second and third zones are defined, with the first zone 75 including six micro-optical elements 73, the second zone 76 including eight micro-optical elements 74, and the third zone 86 including eight micro-optical elements 82.

[0170] The optical characteristics of all micro-optical elements 73, 74, 82 in the first zone 75, the second zone 76 and the third zone 86 have the same value.

[0171] In the defining step 110, the micro-optical elements 73 in the first zone 75 are refractive micro-lenses having a diameter of 1 millimeter, a refractive power of 4 diopters, and a focal length of 1000 millimeters, the micro-optical elements 74 in the second zone 76 are refractive micro-lenses having a diameter of 1 millimeter, a refractive power of 4 diopters, and a focal length of 1000 millimeters, and the micro-optical elements 82 in the third zone 86 are refractive micro-lenses having a diameter of 1 millimeter, a refractive power of 4 diopters, and a focal length of 1000 millimeters.

[0172] In a non-limiting embodiment, the micro-optical elements 73 in the first zone 75 have optical characteristics adapted to provide a first myopia suppression function for the wearer's myopia, and the micro-optical elements 74 in the second zone 76 have optical characteristics adapted to provide a second myopia suppression 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 adapted to provide a third myopia suppression function for the wearer's eye. In other words, the micro-optical elements 82 in the third zone 86 have optical characteristics adapted to provide a specific spatial distribution of blur. Thus, the micro-optical elements in the third zone 86 have optical characteristics that provide a third defocus spatial function.

[0173] The third myopia suppression function of the myopia can be the same as the first myopia suppression function and the second myopia suppression function. In another embodiment, the third myopia suppression function of the myopia is different from the first and second myopia suppression functions of the myopia.

[0174] The first myopia suppression function depends on the optical characteristics of the micro-optical elements 73 included in the first zone 75, the second myopia suppression function depends on the optical characteristics of the micro-optical elements 74 included in the second zone 76, and the third myopia suppression function depends on the optical characteristics of the micro-optical elements 82 included in the third zone 86.

[0175] Since the micro-optical elements of the contact lens 70 have the same optical characteristics, the first, second and third optical functions obtained in the preliminary design are similar.

[0176] In one embodiment, the micro-optical elements 73, 74, and 82 comprise micro-lenses that provide refractive power. The refractive power of the micro-optical elements 73, 74, and 82 (micro-lenses) in the first zone 75, the second zone 76, and the third zone 86 is different from the refractive power of the macro-optical components of the contact lens 70. In other embodiments, the micro-optical elements 73, 74, and 82 may provide diffractive or diffusive micro-optical functions, as described above.

[0177] After defining the preliminary lens optical design for the contact lens 70, the method 200 performs the determining steps 120, 130 as described in FIG.

[0178] In the example shown in FIG. 10, only the diameter and refractive power of the micro-optical elements 73, 74, 82 are determined in the determining steps 120, 130.

[0179] The method 200 further includes a step 210 of determining, for the third zone 86 of the contact lens 70, the diameter and refractive power values ​​of the micro-optical elements 82 superimposed on the contact lens 70. As with the method 100, the determining step 210 takes into account the optical characteristics of the micro-optical elements determined in the previous determining steps 120, 130.

[0180] To this end, a third optical function of the contact lens 70 is calculated over the entire third region of the contact lens 70 .

[0181] FIG. 14 shows an example of first, second, and third target optical functions. In this example, the first, second, and third target optical functions are similar. Therefore, in this example, the first, second, and third target optical functions are referred to as target optical function 1000. In the present disclosure, all modulation transfer functions can be obtained over wavelengths included in the visible spectrum, for example, 400-800 nm or 400-780 nm. Advantageously, all modulation transfer functions are calculated for a center wavelength of 540-560 nm, for example, 550 nm.

[0182] The modulation transfer function shown in Figure 14 is preferably calculated at a wavelength of 550 nm using a 4 millimeter aperture, where the aperture is centered at the optical center V of the contact lens (optical design of the contact lens).

[0183] In the present disclosure, the aperture corresponds to a virtual stop located on the contact lens (i.e., on the spare lens optical design of the contact lens). The use of the aperture makes it possible to easily simulate the effect of the wearer's eye pupil, for example, when the wearer's eye pupil constricts when the wearer is active in a lit environment (e.g., for outdoor activities) and when the wearer's eye pupil dilates when the wearer is active in a low light environment (e.g., for indoor activities).

[0184] According to this embodiment, the target optical function shown in FIG. 14 exhibits values ​​of 0.95, 0.90, 0.85, 0.80, 0.75, 0.70, 0.75, 0.60 or greater over a range of spatial frequencies comprised between 0 and 5 cycles per degree. Additionally, the target optical function has values ​​of 0.40, 0.35, 0.30 or greater over a range of spatial frequencies comprised between 10 and 20 cycles per degree. The target optical function then has values ​​of 0.20 or greater over a range of spatial frequencies comprised between 20 and 30 cycles per degree. Preferably, the target optical function has values ​​of 0.30, 0.28, 0.26, 0.24, 0.22, 0.20 or greater over a range of spatial frequencies comprised between 20 and 30 cycles per degree.

[0185] Next, in a determining step 210, the third optical function is then compared (in a third comparison) to the target optical function shown in FIG.

[0186] In the method 200, the step 210 of determining values ​​of selected optical characteristics of the micro-optical elements 82 in the third zone 86 comprises an iterative optimization process including the following steps.

[0187] - modifying 211 the optical characteristics of the micro-optical element 82, - checking whether the third comparison satisfies the criteria 212; If the criteria are not met, repeat correcting 211 and checking 212.

[0188] The implementation of the iterative optimization process of determining step 210 is similar to the iterative optimization process of determining steps 120, 130 shown in Fig. 12. For example, the diameters and refractive powers of micro-optical elements in the same zone are determined simultaneously, which means that the determining step is configured such that in each iteration the diameters and refractive power values ​​of micro-optical elements belonging to the same zone change.

[0189] As mentioned above, the determining step 210 includes defining a criterion, which may be a minimum quadratic deviation between the third optical function and the third target function and / or a minimum value of a particular cost function, a value or range of values ​​of the third target optical function, etc. Additionally, the number of iterations is also defined.

[0190] In a modifying step 210, the values ​​of the optical characteristics defined in the defining step 110 are changed to another value of at least one optical characteristic.

[0191] For example, the diameter d of the micro-optical element 82 in the third zone 13 86 is selected from 0.3 millimeters to 2 millimeters (e.g., any value between 0.3 millimeters and 2.0 millimeters, including 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, and 2.00). The micro-optical elements 82 in the third zone 86 are defined to have a spherical power between 1 diopter and 20 diopters, e.g., between 1 and 10 diopters.

[0192] In another embodiment, the refractive, diffractive, or diffractive optical function and / or focal length, and / or position of the micro-optical elements 82 in the third zone 86 defined in the defining step 110, are changed in the modifying step 211. In addition, the surface shape of the micro-optical elements may be changed to a spherical, aspherical, or toroidal surface shape. For example, a refractive optical function may be changed to a diffractive optical function, or vice versa. As described above, because the contact lens 70 includes several micro-optical elements 73, 74, 82 in each zone, the density or number of the micro-optical elements is an optical feature that may be optimized in the determining step 210. The density is selected so that the micro-optical elements 82 cover between 20 and 80 percent 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 include, for example, between 2 and 10,000 (e.g., between 4 and 100) micro-optical elements.

[0193] Each micro-optical element in the third zone 86 is spaced at least 0.5 mm from an adjacent micro-optical element 86. For example, an edge of one optical element 1 included in the third zone 86 is spaced 1 millimeter from an edge of an adjacent optical element 1.

[0194] Once the iterative process is complete, method 200 includes step 140 of providing a final lens design for contact lens 70. In this example, the final lens design for the contact lens is based on the values ​​of the optical characteristics of the micro-optical elements determined for the first zone, the second zone, and the third zone. It may also be based on a preliminary lens optical design (e.g., by considering the macro-optical features of the contact lens, and / or the geometry of the contact lens, and / or the position, and / or size and shape of the first, second, and third zones, etc.).

[0195] 10 shows an example of a final lens design for a contact lens 70. In this example, the first zone 75 is d 75 The second zone 76 includes six micro-optical elements having sizes denoted by d76 The third zone 86 includes eight micro-optical elements having sizes denoted d 86 The contact lens 70 includes eight micro-optical elements having sizes labeled 73, 74, 82. All micro-optical elements 73, 74, 82 have the same size and present a diameter of 2 millimeters. In addition, all micro-optical elements 73, 74, 86 (diffusing micro-lenses) of the contact lens 70 have the same power 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.

[0196] Figure 11 also shows an example of a contact lens 90 obtained by the method 100. In this embodiment, a first zone 75, a sub-zone 78 of the first zone, a second zone 76 and a third zone 86 are found, as disclosed in the previous embodiment shown in Figure 10. Therefore, only the differences with respect to the embodiment shown in Figure 10 will be described.

[0197] 11 shows an example where, in addition to the diameter and refractive power, the density or number of micro-optical elements in the third zone 86 is determined in step 210. In this example, the first zone 75 has a diameter of d 75 The second zone 76 includes six micro-optical elements having sizes denoted by d 76 The third zone 86 includes eight micro-optical elements having sizes denoted d 86 The contact lens 10 includes twelve micro-optical elements having sizes labeled *. The micro-optical elements in the first zone 75, the second zone 76, and the third zone 86 are diffractive micro-lenses. 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 of the micro-optical elements in the contact lens 10 have the same diopter power, for example, 4 diopters.

[0198] 15 shows an example of a first optical function 1001, a second optical function 1002 and a third optical function 1003 calculated (separately) in the determining steps 120, 130, 210. The first optical function 1001, the second optical function 1002 and the third optical function 1003 are obtained by the final lens optical design of the corrective lens 90 shown in FIG.

[0199] 15 shows an example in which in determining steps 120, 130 and 210, first, second and third optical functions 1001, 1002, 1003 are calculated for spatial frequencies within a predetermined range, for example over a range of spatial frequencies comprised between 0 and 30 cycles per degree. Specifically, first, second and third optical functions 1001, 1002, 1003 are calculated for spatial frequencies comprised between 0 and 5 cycles per degree, between 10 and 30 cycles per degree and between 20 and 30 cycles per degree.

[0200] Generally, different ranges of spatial frequencies (0-5 cycles per degree and 10-30 cycles per degree) correspond to different effects on the modulation transfer function. The range of spatial frequencies between 0 and 5 cycles per degree corresponds to myopia control, while the range of spatial frequencies between 10 and 30 corresponds to visual acuity. The modulation transfer function shown in FIG. 15 is calculated using a circular aperture having a size (i.e., diameter) between 3 and 10 millimeters and centered at the optical center or vertex V of the contact lens 90. In the following example, the aperture is associated with or defined as a specific portion of the contact lens 90. This means that an aperture having a diameter of 4 mm corresponds to a 4 mm diameter circular portion defined on the contact lens 90. The diameter of the aperture defines the portion of the contact lens 90 through which light travels for the calculation of the modulation transfer function. According to the present disclosure, the specific portion of the contact lens 90 may be defined throughout the entire area of ​​the contact lens 90.

[0201] The first optical function 1001 shown in Figure 15 is calculated at a wavelength of 550 nm using a 4 mm aperture. The second optical function 1002 shown in Figure 15 is calculated at a wavelength of 550 nm using a 6 mm aperture. The third optical function 1003 shown in Figure 15 is calculated at a wavelength of 550 nm using an 8 mm aperture.

[0202] According to this embodiment, the first, second, and third optical functions 1001, 1002, 1003 shown in Figure 15 all exhibit values ​​of 0.95, 0.90, 0.85, 0.80, 0.75, 0.70, 0.75, 0.60, or greater, over a range of spatial frequencies comprised between 0 and 5 cycles per degree. In this embodiment, the first, second, and third optical functions 1001, 1002, 1003 are similar over a range of spatial frequencies comprised between 0 and 5 cycles per degree. In another embodiment, the difference between the values ​​of the first, second, and third optical functions is 5 percent or less over a range of spatial frequencies comprised between 1 and 5 cycles per degree or 1 and 3 cycles per degree.

[0203] The first optical function 1001 has a value of 0.40, 0.35, 0.30 or greater over a range of spatial frequencies comprised between 10 and 20 cycles per degree. Then, the first optical function 1001 has a value of 0.20 or greater over a range of spatial frequencies comprised between 20 and 30 cycles per degree. Preferably, the first optical function 1001 has a value of 0.30, 0.28, 0.26, 0.24, 0.22, 0.20 or greater over a range of spatial frequencies comprised between 20 and 30 cycles per degree.

[0204] The second optical function 1002 has values ​​of 0.39, 0.38, 0.35, 0.30, 0.28 or greater over a range of spatial frequencies comprised between 10 and 20 cycles per degree. The second optical function 1002 then has values ​​of 0.15 or greater over a range of spatial frequencies comprised between 20 and 30 cycles per degree. Preferably, the second optical function 1002 has values ​​of 0.28, 0.26, 0.24, 0.22, 0.20 or greater over a range of spatial frequencies comprised between 20 and 30 cycles per degree.

[0205] The third optical function 1003 has values ​​of 0.39, 0.38, 0.35, 0.30, 0.28, 0.25 or greater over a range of spatial frequencies comprised between 10 and 20 cycles per degree. The third optical function 1003 then has values ​​of 0.15 or greater over a range of spatial frequencies comprised between 20 and 30 cycles per degree. Preferably, the third optical function 1003 has values ​​of 0.28, 0.26, 0.24, 0.22, 0.20 or greater over a range of spatial frequencies comprised between 20 and 30 cycles per degree.

[0206] In this example, the second optical function 1002 exhibits a value over a range of spatial frequencies comprised between 10 and 20 cycles per degree that is greater than the value of the third optical function 1003 over a range of spatial frequencies comprised between 10 and 20 cycles per degree, and the values ​​of the second optical function 1002 and the third optical function 1003 are compared at similar spatial frequencies. The difference between the values ​​of the second optical function 1002 and the third optical function 1003 is 10 percent or less over a range of spatial frequencies comprised between 10 and 20 cycles per degree.

[0207] Additionally, the first optical function 1001 exhibits a value over a range of spatial frequencies comprised between 10 and 20 cycles per degree that is greater than the value of the second optical function 1002 over a range of spatial frequencies comprised between 10 and 20 cycles per degree, and the value of the first optical function 1001 and the value of the second optical function 1002 are compared at similar spatial frequencies. For example, the difference between the value of the first optical function 1001 and the value of the second optical function 1002 is 10 percent or less over a range of spatial frequencies comprised between 10 and 20 cycles per degree.

[0208] In this example, the second optical function 1002 exhibits a value over a range of spatial frequencies comprised between 20 and 30 cycles per degree that is greater than the value of the third optical function 1003 over a range of spatial frequencies comprised between 20 and 30 cycles per degree, and the values ​​of the second optical function 1002 and the third optical function are compared at similar spatial frequencies. The difference between the values ​​of the second optical function 1002 and the third optical function 1003 is 10 percent or less over the range of spatial frequencies comprised between 20 and 30 cycles per degree.

[0209] Additionally, the first optical function 1001 exhibits values ​​over a range of spatial frequencies comprised between 20 and 30 cycles per degree that are greater than values ​​of the second optical function over a range of spatial frequencies comprised between 10 and 20 cycles per degree, and the values ​​of the first optical function 1001 and the second optical function are compared at similar spatial frequencies. The difference between the values ​​of the first optical function 1001 and the second optical function 1002 is 10 percent or less over a range of spatial frequencies comprised between 20 and 30 cycles per degree.

[0210] The first, second, and third optical functions have values ​​that differ by no more than 10 percent over a range of spatial frequencies comprised between 10 and 30 cycles per degree, but these optical functions are close to the target optical function shown in Figure 14 over the same range of spatial frequencies. Specifically, in this example, the difference between the first, second, and third optical functions and the target optical function of Figure 14 is less than 10 percent, preferably less than 5 percent, over a range of spatial frequencies comprised 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, second, and third optical functions and the target optical function of Figure 14 is less than 5 percent over a range of spatial frequencies comprised 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.

[0211] Thus, at the end of determining step 210, the difference between the values ​​of the first, second and third optical functions is no more than 5 percent over a range of spatial frequencies comprised between 0 and 5 cycles per degree, and the difference between the values ​​of the first, second and third optical functions is no more than 10 percent over a range of spatial frequencies comprised 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 contact lens 10 is well adapted to variations in the lighting environment, since the final lens design will provide approximately equivalent modulation transfer functions (with a 10 percent tolerance) for wearer's eyes with pupils of 4 mm, 6 mm and 8 mm diameter.

[0212] 10, 11 and 16, an example of the optical characteristics of the micro-optical elements contained in the selected third zone 86 at the end of the loop of determining step 210 is described.

[0213] Figure 16 shows a third optical function 1003 calculated over a third region of the contact lens 90 shown in Figure 11 and another third optical function 2003 calculated over a third region of the contact lens 70 shown in Figure 10. The third target optical function 2003 is calculated similarly to the third target optical function 1003, as described above. In addition, Figure 16 shows an example of a third target optical function illustrated via value intervals numbered 2004, 2005 defined for a particular range of spatial frequencies.

[0214] Value interval 2004 defines values ​​of the third target optical function comprised between 0.60 and 0.67 at a spatial frequency of 5 cycles per degree, and value interval 2005 defines values ​​of the third target optical function comprised between 0.35 and 0.45 at a spatial frequency of 10 cycles per degree. Value intervals 2004, 2005 are each an example of criteria used in determining step 210.

[0215] In the example of FIG. 16, the third optical function numbered 2003 has the following:

[0216] - a value equal to 0.67 at a spatial frequency of 5 cycles per degree, and - A value equal to 0.45 at a spatial frequency of 10 cycles per degree.

[0217] Thus, the value of the third target optical function 2003 at a spatial frequency of 5 cycles per degree is inside the third target optical function value interval 2004, and the value of the third target optical function 2003 at a spatial frequency of 10 cycles per degree is outside the third target optical function value interval 2005. As a result, the value of the third optical function 2003 at a spatial frequency of 10 cycles per degree does not meet the criteria of determining step 210, even though the third optical function 2003 exhibits better optical properties.

[0218] This means that at the end of the iterative process of determining step 210, with criteria defined as those shown in FIG. 16, the optical lens design shown in FIG. 10 cannot be selected.

[0219] The third optical function 1003 comprises:

[0220] - a value equal to 0.63 at a spatial frequency of 5 cycles per degree, and - A value equal to 0.37 at a spatial frequency of 10 cycles per degree.

[0221] This means that the value of the third target optical function 1003 at a spatial frequency of 5 cycles per degree falls within the third target optical function value interval 2004, and the value of the third target optical function 1003 at a spatial frequency of 10 cycles per degree falls within the third target optical function value interval 2005. As a result, the value of the third optical function 1003 at a spatial frequency of 5 to 10 cycles per degree satisfies the criteria of determining step 210. The optical design shown in FIG. 11 may be selected at the end of the iterative process of determining step 210, with criteria defined such as those shown in FIG. 16. The lens design shown in FIG. 11 becomes the final optical lens design for the contact lens intended to be worn on the wearer's eye. The contact lens is then manufactured according to this final design.

Claims

1. 1. A computer-implemented method for designing a contact lens to be placed on a wearer's eye, comprising: determining, for a first zone 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 zone based on a first comparison; the first comparison is between a first optical function representative of the optical quality of the contact lens calculated over a first region of the contact lens and a first target optical function; determining that the first region is contained in the first zone and includes at least one micro-optical element of the first zone; and determining, for a second zone 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 second zone based on a second comparison, the second comparison is between a second optical function representative of the optical quality of the contact lens calculated over a second region of the contact lens and a second target optical function; determining that the second region is included at a junction of the first zone and the second zone and includes at least one micro-optical element of the second zone; providing a final lens design for the contact lens based on values ​​of at least one optical characteristic of micro-optical elements determined for the first zone and the second zone, and providing the final lens design, wherein the final lens design is the optical design of the contact lens to be worn by the wearer.

2. The computer-implemented method of claim 1 , wherein the second zone is arranged around the first zone.

3. 3. The computer-implemented method of claim 1, wherein determining the value of at least one optical characteristic of at least one micro-optical element in the first zone is performed before determining the value of at least one optical characteristic of at least one micro-optical element in the second zone.

4. and determining, for a third zone of the contact lens arranged annularly around the second zone, 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, the third comparison is between a third optical function of the contact lens calculated over a third region of the contact lens and a third target optical function; the third region is included at a junction of the first zone, the second zone, and the third zone, and includes at least one micro-optical element of the third zone; 4. The computer-implemented method of claim 3, further comprising determining the final lens design of the contact lens based also on the value of at least one optical characteristic of a micro-optical element determined for the third zone.

5. 5. The computer-implemented method of claim 4, wherein 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.

6. 6. The computer-implemented method of claim 4 or 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. 7. The computer-implemented method of claim 1, 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 computer-implemented method of any one of claims 1 to 7, wherein the first target optical function and the second target optical function are the same.

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

10. 10. The computer-implemented method of claim 1, wherein at least one of the first optical function and the second optical function is calculated for spatial frequencies comprised 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. At least one optical feature of at least one micro-optical element in the first zone and at least one optical feature of at least one micro-optical element in the second zone are The refractive power, Geometric shapes and a refractive, diffractive or diffractive optical function; The focal length and The diameter and and a location.

12. 12. The computer-implemented method of claim 11, wherein at least one micro-optical element in the first zone has a circular outline and a diameter of at least one micro-optical element in the first zone is between 0.3 millimeters and 2 millimeters, and / or at least one micro-optical element in the second zone has a circular outline and a diameter of at least one micro-optical element in the second zone is between 0.3 millimeters and 2 millimeters.

13. 13. The computer-implemented method of claim 11 or 12, wherein the refractive power of at least one micro-optical element in the first zone is between 1 diopter and 10 diopters and / or the refractive power of at least one micro-optical element in the second zone is between 1 diopter and 10 diopters.

14. the first zone comprises a plurality of micro-optical elements, and at least one optical characteristic of the first zone comprises a density of micro-optical elements across the first zone or a number of micro-optical elements within the first zone; and / or 14. The computer-implemented method of claim 1, wherein the second zone includes a plurality of micro-optical elements, and wherein at least one optical characteristic of the first zone includes a density of micro-optical elements across the second zone or a number of micro-optical elements within the second zone.

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

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