Personalization of progressive lenses

Abstract

An apparatus and method for use with a frame (21) of eyeglasses (18) to be worn by a wearer are described. The progressive lens (20) is configured to provide a distant vision correction function and a near vision correction function. The progressive lens comprises a customized monochromatic base lens (22) configured to provide at least part of a distant vision correction function, the customized lens being formed to conform to the ophthalmic requirements of the wearer and / or the requirements of the spectacle frame (21). The progressive lens also includes an additional lens (24) coupled to the custom monochromatic base lens (22), the additional lens (24) configured to provide a progressive near vision correction function. Other applications are also described.

Description

[0001] Cross - reference to related applications

[0002] This application claims priority to U.S. Provisional Patent Application No. 63 / 424,915, filed on November 13, 2022, by Katzman, titled "Personalization of progressive lenses", which is incorporated herein by reference.

[0003] Field of embodiments of the invention

[0004] Some applications of the present invention generally relate to ophthalmic lenses. In particular, some applications relate to manufacturing progressive lenses using a customized base lens and an additional lens coupled to the customized base lens.

[0005] Background

[0006] Presbyopia is a condition that gradually affects most people over the age of 40. Even when a subject uses vision correction for distant objects, this condition causes a gradual deterioration in the ability to clearly focus on nearby objects. Presbyopia is typically treated with multifocal glasses, progressive glasses, or contact lenses, as laser - assisted in - situ keratomileusis (i.e., LASIK) and other types of surgery are not suitable for treating this condition. In some cases, presbyopia is treated by implanting an intraocular lens that addresses presbyopia.

[0007] Corrective lenses are used in glasses to correct presbyopia and other accommodation disorders. Many people with presbyopia also have myopia or hyperopia (i.e., nearsightedness or farsightedness, respectively). The basic solution for these people is to use multifocal spectacle lenses. Multifocal spectacle lenses contain two or more lens powers, where each power is suitable for objects at a corresponding distance. Bifocal glasses contain two lens powers; trifocal glasses contain three lens powers. Progressive spectacle lenses are characterized by a gradient of increasing lens power. The gradient starts from the patient's distance prescription and reaches the maximum addition or full reading addition at the lower part of the lens. The addition in the middle of the lens typically enables clear vision in an intermediate range, such as reading text on a computer screen. The length of the progressive power gradient on the lens surface depends on the lens design, where the final addition is typically between 0.50 and 3.50 diopters. The addition value determined by the prescription depends on the degree of the patient's presbyopia.

[0008] A freeform lens is a lens that can be manufactured in a customized manner to fit the needs of a specific patient. In some cases, the freeform lens is processed (e.g., using milling, using a lathe, polishing, and / or engraving) to be optimized for a specific frame. Typically, specialized software is used to calculate the curvature to be formed in the lens in order to produce a lens that meets a given set of requirements. Then, a specialized cutting device capable of forming the lens within very small tolerances is used to process the lens.

[0009] It should be noted that there are other types of surface-treated lenses that rely on less specialized techniques than the freeform techniques described above to process the surface of the lens. Traditionally, customized lenses are cut and polished using hard tools according to the patient's prescription, including any required prisms. The tools are typically aluminum tools with spherical or toric surfaces, usually in quarter or eighth diopter increments. Such tools typically have to be stored separately for each refractive index, such that a laboratory using this method has to store a large number of tools. The freeform techniques described above are considered advantageous over traditional methods because the freeform techniques do not require storing a large number of cutting and polishing tools.

[0010] Overview of Embodiments

[0011] According to some applications of the present invention, a progressive lens configured to provide both distance vision correction and near vision correction includes (a) a customized single-vision base lens (also referred to herein as a "custom base lens" or "base lens") that typically provides distance vision correction functionality, and (b) an additional lens coupled to the base lens that provides progressive near vision correction functionality. Typically, the additional lens provides near vision correction and a progressive transitionary corridor between near vision and distance vision. The additional lens is typically coupled to the rear side of the customized base lens, i.e., the concave side of the base lens, which is closer to the patient's face when the patient wears glasses with the progressive lens disposed therein. For some applications, the base lens provides all of the distance vision correction functionality provided by the combined lens. Alternatively, in some applications, the base lens provides only a portion of the distance vision correction functionality provided by the combined lens, and the additional lens provides the remaining portion of the required distance vision correction functionality to the progressive lens (e.g., as described in Katzman's US11,378,821, which is incorporated herein by reference).

[0012] Custom base lenses are typically designed according to the specific ophthalmic requirements of the wearer (e.g., spherical, cylindrical, and / or axis) and / or the requirements of the eyewear frame in which the progressive lens is to be placed. For some applications, the custom base lens includes aspheric correction, anti-fatigue correction, tilt aberration correction, and / or myopia control correction. For some applications, the base lens is a surface-treated lens, such as a freeform lens. It should be noted that although the base lens is described as a single-vision lens, the term should be construed to mean that the base lens is substantially single-vision, and the term should not be construed to exclude corrections made to the overall single-vision curvature of the lens, such as the foregoing corrections. Even in the case of such corrections, the base lens is still a substantially single-vision lens because any such correction typically causes the average power of the base lens at the near vision measurement position to change by no more than 0.125 diopters relative to the average power of the base lens at the far vision measurement position. For some applications, the add-on lens includes one or more corrections, such as aspheric correction, spherical and / or cylindrical correction, anti-fatigue correction, and / or myopia control correction.

[0013] It should be noted that the use of a combination of a base lens and additional optical elements (such as an additional film or an add-on lens) to provide a progressive lens is described in Arieli's US 9,995,948 (which is incorporated herein by reference) and Katzman's US 11,378,821. However, although prior applications (such as Katzman's US 11,378,821) have described the use of a single-vision rigid stock lens as the base lens, according to some applications of the present application, the base lens is a custom single-vision lens (e.g., a freeform lens). Using a single-vision, rigid stock lens as the base lens generally allows a large number of prescriptions to be provided using a relatively small number of stock lenses. However, as described herein, using a custom single-vision lens (e.g., a freeform lens) as the base lens can provide one or more advantages over using a single-vision rigid stock lens as the base lens, as further elaborated in detail below. Additionally, using a combination of a custom single-vision base lens (e.g., a freeform base lens) and an add-on lens to manufacture a progressive lens can provide one or more advantages over using a single-piece custom progressive lens (e.g., a single-piece freeform lens).

[0014] For some applications, the attachment lens is a rigid lens. Alternatively, the attachment lens is a flexible film. Typically, the attachment lens is flexible under a given set of conditions (e.g., when the film is heated to a temperature above a given temperature), and under typical ambient conditions (e.g., at a temperature below 50 degrees Celsius), the attachment lens is substantially rigid, such that the attachment lens has the characteristics of a rigid lens. Typically, during the manufacture of the progressive lens, particularly when the attachment lens is attached to a customized base lens, the given set of conditions is applied to the attachment lens. Thus, the flexibility of the attachment lens allows the attachment lens to conform to the shape of the customized base lens. For example, during the manufacture of the progressive lens, particularly when the attachment lens is attached to a customized base lens, the attachment lens can be heated to a temperature above a given temperature. Typically, even when placed under the given conditions (e.g., when heated to a temperature above a given temperature), the attachment lens is configured to maintain its optical properties. After the attachment lens has been adhered to the customized base lens to form the progressive lens, the progressive lens is placed under ambient conditions (e.g., a temperature below 50 degrees Celsius), such that the attachment lens typically assumes a rigid state. For some applications, the progressive lens is manufactured from a combination of a base lens and an attachment lens using techniques that are generally similar to those described in Halahmi's US17 / 904,269, which is the U.S. national stage of Halahmi's WO2021 / 198822 and is incorporated herein by reference with necessary modifications.

[0015] As described above, the attachment lens is typically attached to the rear side of the customized base lens. Typically, for such applications, one or more functional coatings (such as a hard coating, an anti-reflection coating, a superhydrophobic coating, an antistatic coating, a cleaning coating, a blue light filter, a reflective coating, an anti-UV coating, a photochromic coating, a polarization coating, a coloring coating, a mirror coating, or any combination thereof) are pre-applied to the front surface of the customized base lens, and the rear surface of the customized base lens is processed according to the specific needs of the patient. Further typically, the attachment lens used with the customized lens is selected from a relatively small inventory of non-customized attachment lenses, and one or more of the above functional coatings are pre-applied to the rear surface of the attachment lens. (It should be noted that the coating applied to the rear surface of the attachment lens is not necessarily the same as the coating applied to the front surface of the customized base lens.) Thus, once the progressive lens is formed from a combination of the base lens and the attachment lens, both the front surface and the rear surface of the progressive lens are coated with one or more coatings. For some applications, the attachment lens is attached to the front side of the customized base lens, in which case the front surface of the attachment lens and the rear surface of the base lens are typically coated with pre-applied coatings.

[0016] Thus, according to some embodiments of the present invention, there is provided a device for use with an eyeglass frame to be worn by a wearer, the device comprising:

[0017] Progressive lenses, which are configured to provide distant vision correction and near vision correction functions, the progressive lenses comprising:

[0018] A customized single vision base lens, which is configured to provide at least a part of the distant vision correction function, the customized lens being formed to conform to the ophthalmic requirements of the wearer and / or the requirements of the spectacle frame; and

[0019] An additional lens, which is coupled to the customized single vision base lens, the additional lens being configured to provide progressive near vision correction function.

[0020] In some embodiments, the customized single vision base lens provides all of the distant vision correction function of the progressive lens.

[0021] In some embodiments, the customized single vision base lens only provides a part of the distant vision correction function of the progressive lens, and the additional lens provides the remaining part of the distant vision correction function of the progressive lens.

[0022] In some embodiments, the additional lens is an off-the-shelf lens.

[0023] In some embodiments, the customized single vision base lens is a freeform lens.

[0024] In some embodiments, the customized single vision base lens is a customized single vision base lens formed by cutting and polishing using a hard tool.

[0025] In some embodiments, the customized single vision base lens is formed to conform to the ophthalmic requirements of the wearer, and the ophthalmic requirements of the wearer are selected from the group consisting of: spherical, cylindrical and axis.

[0026] In some embodiments, the customized single vision base lens is formed with a single vision refractive characteristic, and the single vision refractive characteristic is calculated to create a wearing prescription that combines the personalized ophthalmic parameters of the wearer.

[0027] In some embodiments, the customized single vision base lens is formed to compensate for any effect on the personalized ophthalmic parameters caused by the coupling of the additional lens and the customized single vision lens.

[0028] In some embodiments, the customized single vision base lens is formed to conform to the clinical prism prescription of the wearer, so that the progressive lens has the required clinical prism correction at the prism reference point of the progressive lens.

[0029] In some embodiments, there is a thickness difference between the top edge and the bottom edge of the additional lens, and prism thinning is introduced into the customized single vision base lens, so that there is a thickness difference between the top edge and the bottom edge of the customized single vision base lens, and the thickness difference between the top edge and the bottom edge of the customized single vision base lens at least partially compensates for the thickness difference between the top edge and the bottom edge of the additional lens.

[0030] In some embodiments, additional optical characteristics are added to the periphery of a customized single vision base lens to compensate for unwanted peripheral aberrations caused by differences between the prescription for which an add-on lens is designed and the prescription needed by the wearer.

[0031] In some embodiments, the customized single vision base lens is formed to have an unedged diameter that is optimized to fit the shape of the frame of the glasses.

[0032] In some embodiments, each of the customized single vision base lens and the add-on lens has a thickness in a given region that results in the lens having a structural strength below a given threshold for that region, but the progressive lens has a structural strength above the threshold in the given region.

[0033] In some embodiments, the combination of the customized single vision base lens and the add-on lens has a structural strength below the threshold for a given region, and the add-on lens is coupled to the customized single vision base lens using an adhesive that acts as a shock absorber such that the progressive lens has a structural strength above the threshold in the given region.

[0034] In some embodiments, additional optical characteristics are added to the periphery of the customized single vision base lens to compensate for a mismatch between the face form angle of the lens ring for which the add-on lens is designed and the face form angle of the lens ring of the frame of the glasses.

[0035] In some embodiments, the additional optical characteristics added are configured to take into account multiple personalized ophthalmic parameters of the wearer.

[0036] In some embodiments, the additional optical characteristics added are configured to take into account one or more personalized ophthalmic parameters of the wearer selected from the group consisting of: back vertex distance, pantoscopic tilt, and prism.

[0037] In some embodiments, the progressive lens includes one or more functional coatings that are pre-applied to at least one of the front surface and the back surface of the progressive lens before the add-on lens is coupled to the customized single vision base lens.

[0038] In some embodiments, the one or more functional coatings include one or more functional coatings selected from the list consisting of: hard coat, anti-reflective coating, superhydrophobic coating, antistatic coating, self-cleaning coating, blue light filter, reflective coating, anti-UV coating, photochromic coating, tinted coating, and mirror coating.

[0039] In some embodiments, the progressive lens includes a first set of one or more functional coatings and a second set of one or more functional coatings. Before the add-on lens is attached to the customized single-vision base lens, the first set of one or more functional coatings is pre-applied to the front surface of the progressive lens, and the second set of one or more functional coatings is pre-applied to the back surface of the progressive lens.

[0040] In some embodiments, the first set of one or more functional coatings pre-applied to the front surface of the progressive lens is the same as the second set of one or more functional coatings pre-applied to the back surface of the progressive lens.

[0041] In some embodiments, the first set of one or more functional coatings pre-applied to the front surface of the progressive lens is different from the second set of one or more functional coatings pre-applied to the back surface of the progressive lens.

[0042] In some embodiments, there is a thickness difference between the top edge and the bottom edge of the add-on lens, and prism thinning is introduced into the customized single-vision base lens such that the top edge and the bottom edge of the customized single-vision base lens do not compensate for the thickness difference between the top edge and the bottom edge of the add-on lens, resulting in a difference in thickness between the top edge and the bottom edge of the progressive lens.

[0043] In some embodiments, the average thickness of the progressive lens on its edged contour after edge treatment is lower than the average thickness if the customized single-vision lens is prism thinned such that the top edge and the bottom edge of the customized single-vision base lens compensate for the thickness difference between the top edge and the bottom edge of the add-on lens.

[0044] In some embodiments, the customized single-vision base lens includes one or more corrections selected from the group consisting of aspheric correction, anti-fatigue correction, tilt aberration correction, and / or myopia control correction.

[0045] In some embodiments, the selected one or more corrections cause the average power of the customized single-vision base lens at the near vision measurement position to change by no more than 0.125 diopters relative to the average power of the customized single-vision base lens at the far vision measurement position.

[0046] According to some embodiments of the present invention, there is also provided a method for use with an eyeglass frame to be worn by a wearer, the method comprising:

[0047] Manufacturing a progressive lens for placement in an eyeglass frame by the following steps:

[0048] Coupling the following to each other:

[0049] A customized single-vision base lens configured to provide at least a portion of the distance vision correction function, the customized lens being formed to conform to the ophthalmic requirements of the wearer and / or the requirements of the spectacle frame; and

[0050] An additional lens coupled to the customized single-vision base lens, the additional lens being configured to provide a progressive near vision correction function.

[0051] In some embodiments, the customized single-vision base lens provides all of the distance vision correction function of the progressive lens.

[0052] In some embodiments, the customized single-vision base lens provides only a portion of the distance vision correction function of the progressive lens, and the additional lens provides the remaining portion of the distance vision correction function of the progressive lens.

[0053] In some embodiments, the additional lens is an off-the-shelf lens.

[0054] In some embodiments, the customized single-vision base lens is a freeform lens.

[0055] In some embodiments, the customized single-vision base lens is a customized single-vision base lens formed by cutting and polishing using a hard tool.

[0056] In some embodiments, the customized single-vision base lens is formed to conform to the ophthalmic requirements of the wearer, the ophthalmic requirements of the wearer being selected from the group consisting of spherical, cylindrical, and axis.

[0057] In some embodiments, the customized single-vision base lens is formed with a single-vision refractive characteristic that is calculated to create a prescription that incorporates the personalized ophthalmic parameters of the wearer.

[0058] In some embodiments, the customized single-vision base lens is formed to compensate for any effect on the personalized ophthalmic parameters that will be caused by the coupling of the additional lens to the customized single-vision lens.

[0059] In some embodiments, the customized single-vision base lens is formed to conform to the clinical prism prescription of the wearer such that the progressive lens has the desired clinical prism correction at the prism reference point of the progressive lens.

[0060] In some embodiments, there is a thickness difference between the top edge and the bottom edge of the additional lens, and the customized single-vision base lens has been prism thinned such that there is a thickness difference between the top edge and the bottom edge of the customized single-vision base lens, and the thickness difference between the top edge and the bottom edge of the customized single-vision base lens at least partially compensates for the thickness difference between the top edge and the bottom edge of the additional lens.

[0061] In some embodiments, a customized single vision base lens has additional optical characteristics added to its periphery to compensate for unwanted peripheral aberrations caused by differences between the prescription for which the add-on lens is designed and the prescription needed by the wearer.

[0062] In some embodiments, the customized single vision base lens includes a customized single vision base lens formed to have an unedged diameter optimized to fit the shape of the frame of the glasses.

[0063] In some embodiments, each of the customized single vision base lens and the add-on lens has a thickness at a given region that results in the lens having a structural strength below a given threshold for that region, and coupling the customized single vision base lens to the add-on lens includes forming a progressive lens having a structural strength above the threshold at the given region.

[0064] In some embodiments, the combination of the customized single vision base lens and the add-on lens has a structural strength below a threshold for a given region, and coupling the customized single vision base lens to the add-on lens includes coupling the customized single vision base lens to the add-on lens using an adhesive that acts as a shock absorber such that the progressive lens has a structural strength above the threshold at the given region.

[0065] In some embodiments, the customized single vision base lens includes a customized single vision base lens that has had additional optical characteristics added to its periphery to compensate for a mismatch between the lens form face curve for which the add-on lens is designed and the lens form face curve of the frame of the glasses.

[0066] In some embodiments, the additional optical characteristics are configured to take into account multiple personalized ophthalmic parameters of the wearer.

[0067] In some embodiments, the additional optical characteristics are configured to take into account one or more personalized ophthalmic parameters of the wearer selected from the group consisting of: back vertex distance, pantoscopic tilt, and prism.

[0068] In some embodiments, coupling the customized single vision base lens to the add-on lens includes coupling the customized single vision base lens to the add-on lens where one or more functional coatings have been pre-applied to at least one of the front surface of the progressive lens and the back surface of the progressive lens before the customized single vision base lens is coupled to the add-on lens.

[0069] In some embodiments, the one or more functional coatings include one or more functional coatings selected from the list consisting of: hard coat, anti-reflective coating, superhydrophobic coating, antistatic coating, self-cleaning coating, blue light filter, reflective coating, anti-UV coating, photochromic coating, tinted coating, and mirror coating.

[0070] In some embodiments, coupling a customized single vision base lens to an add-on lens comprises coupling the customized single vision base lens to the add-on lens when a first set of one or more functional coatings has been pre-applied to the front surface of the progressive lens and a second set of one or more functional coatings has been pre-applied to the back surface of the progressive lens before the customized single vision base lens is coupled to the add-on lens.

[0071] In some embodiments, the first set of one or more functional coatings pre-applied to the front surface of the progressive lens is the same as the second set of one or more functional coatings pre-applied to the back surface of the progressive lens.

[0072] In some embodiments, the first set of one or more functional coatings pre-applied to the front surface of the progressive lens is different from the second set of one or more functional coatings pre-applied to the back surface of the progressive lens.

[0073] In some embodiments, there is a thickness difference between the top edge and the bottom edge of the add-on lens, and the customized single vision base lens comprises a customized single vision base lens to which prism thinning has been applied such that the top edge and the bottom edge of the customized single vision base lens do not compensate for the thickness difference between the top edge and the bottom edge of the add-on lens, such that there is a difference in thickness between the top edge and the bottom edge of the progressive lens.

[0074] In some embodiments, the average thickness of the progressive lens along its profile after edge treatment is lower than the average thickness would be if the customized single vision lens were prism thinned such that the top edge and the bottom edge of the customized single vision base lens compensated for the thickness difference between the top edge and the bottom edge of the add-on lens.

[0075] In some embodiments, the customized single vision base lens comprises one or more corrections selected from the group consisting of aspheric correction, anti-fatigue correction, tilt aberration correction, and / or myopia control correction.

[0076] In some embodiments, the one or more selected corrections cause the average power of the customized single vision base lens at a near vision measurement location to change by no more than 0.125 diopters relative to the average power of the customized single vision base lens at a far vision measurement location.

[0077] The present invention will be more fully understood from the following detailed description of embodiments of the invention in conjunction with the accompanying drawings, which

[0078] In the figures: BRIEF DESCRIPTION OF THE DRAWINGS

[0079] Figure 1 is a schematic view of a pair of glasses according to some applications of the present invention, the glasses comprising one or more lenses, the one or more lenses being composed of a base lens and an add-on lens adhered to the base lens; and

[0080] Figure 2 It is a schematic diagram of a cross-sectional view of a combination lens according to some applications of the present invention. Detailed implementation mode

[0081] Now refer to Figure 1 , Figure 1 It is a schematic diagram of a pair of glasses 18, which includes one or more combination lenses 20 within a glasses frame 21. According to some applications of the present invention, each of the combination lenses is composed of a base lens 22 and an additional lens 24 adhered to the base lens. For some applications, the combination lens 20 is a progressive lens configured to provide both distance vision correction and near vision correction. For some such applications, the base lens 22 is a customized single-vision base lens (also referred to herein as a "customized base lens" or "base lens") that typically provides distance vision correction functionality, and the additional lens 24 is an additional lens coupled to the base lens and providing progressive near vision correction functionality. Generally, the additional lens provides near vision correction and a progressive transition portion between near and distance vision. The additional lens is typically coupled to the rear side of the customized base lens, i.e., the concave side of the base lens, which is closer to the patient's face when the patient wears glasses with the progressive lens disposed therein. For some applications, an adhesive layer 25 is used to couple the additional lens to the rear side of the customized base lens. In some applications, the additional lens also provides a portion of the desired distance vision correction functionality to the progressive lens (e.g., as described in Katzman's US11,378,821, which is incorporated herein by reference).

[0082] As shown in the cross-sectional view of the combination lens 20, the additional lens 24 is typically coupled to the rear side of the base lens 22, i.e., the concave side of the base lens, which is closer to the patient's face when the patient wears the glasses 18. In some applications, the additional lens is coupled to the front side of the base lens, i.e., the convex side of the base lens, which is farther from the patient's face when the patient wears the glasses 18. The additional lens is typically coupled to the base lens using an adhesive.

[0083] Advantages compared to using a single-piece rigid stock lens as the base lens

[0084] As described above, using a customized single vision lens (e.g., a freeform lens, or a lens produced by a conventional method using a hard tool) as the base lens, as described herein, can provide one or more advantages relative to using a single vision rigid stock lens as the base lens. When using techniques such as those described in Katzman's US11,378,821 to form a progressive lens using a single vision rigid stock lens as the base lens, the additional lenses used in combination with the base lens are typically not designed according to the patient's individual parameters, but rather according to some perceived market average or some average of a prescription range. Examples of such parameters are back vertex distance, pantoscopic tilt, cycloramas tilt, frame shape, fitting information, base curve, thinning prism, and sphere. All of these individualized parameters cannot be considered when adjusting the progressive lens design because it is assumed that the component lenses of the progressive lens are mass-produced and all components of the progressive lens have been manufactured when these individual values are known. In contrast, when using a customized single vision base lens (e.g., a freeform lens or a lens manufactured by a conventional method using a hard tool) to form a progressive lens, the progressive lens is typically designed to be personalized according to the patient's individual parameters. Some of these parameters are as follows:

[0085] Prescription for wear

[0086] When designing customized lenses, it is common to consider personalized ophthalmic parameters such as prism, pantoscopic tilt, bevel face form, base curve, and back vertex distance to calculate a compensated patient prescription (also referred to herein as an “as-worn prescription”). This is especially true for lenses manufactured using freeform technology, but this technique can also be applied to lenses formed using conventional methods with hard tools. The compensated patient prescription allows the patient to perceive the prescription prescribed by the optician for the patient when wearing glasses with the above personalized parameters (as measured in the wearing position). However, since the lens is verified using a lensmeter in which the lens is not oriented in the wearing position, the reading of such a lens in the lensmeter typically does not result in a value that is an integer multiple of a quarter or an eighth diopter as in industry standards. For this reason, a compound lens consisting of a single vision rigid stock lens and an add-on lens cannot produce a progressive lens with an as-worn prescription. However, if a customized single vision lens (e.g., a freeform lens) is used as the base lens, the single vision refractive characteristics (such as sphere, cylinder, and axis) can be calculated to create a correct as-worn prescription that incorporates the personalized parameters. Additionally, adding an add-on lens to a customized base lens may affect some of the above personalized ophthalmic parameters or be affected by some of the above personalized ophthalmic parameters. For some applications, this is addressed by forming the customized lens so as to compensate for any effect on the personalized ophthalmic parameters that will result from adding the add-on lens to the customized base lens, or to compensate for any effect that the personalized ophthalmic parameters may have on the add-on lens as a result of adding the add-on lens to the customized base lens.

[0087] Peripheral design

[0088] In the foregoing section, the concept of wearing prescription, i.e., the concept of optimizing the lens such that a patient perceives the correct prescription when wearing glasses in the wearing position, was discussed. However, this approach only changes the lens in four degrees of freedom (sphere, cylinder, axis, and addition), which are measured at the lensmeter control points (in order to control distance vision and near vision). This does not address the degradation of the lens design, as the values of the personalized parameters have changed with respect to the values originally designed for the addition lens. As an example, let us consider an addition lens designed for a 5-degree bevel face form. If one now wants to use this addition lens in a wraparound frame, the bevel face form will be much larger, e.g., on the order of more than 20 degrees, e.g., 30 degrees. In this case, even if the base lens is processed with an appropriate wearing prescription, the patient will only obtain the original perceived optical parameters at the control points, but the remaining optical design at the periphery may not be optimal. Therefore, according to some applications, additional optical characteristics are added to the periphery of a customized single vision base lens produced using freeform technology in order to compensate for the mismatch between the bevel face form for which the initial addition lens was designed and the bevel face form of the bevel of the glasses frame that the patient is using (i.e., the bevel face form of the eyewear frame). Typically, the peripheral compensation is not calculated separately for each individual characteristic. Instead, all personalized ophthalmic parameters (i.e., back vertex distance, pantoscopic tilt, and / or prism) are typically compensated for as a combination.

[0089] In addition to the foregoing, the peripheral aberration of a known lens is also related to the sphere, cylinder power, and cylinder axis strength of the prescription. However, addition lenses are typically optimized for a relatively wide range of sphere and cylinder values. For some applications, a customized base lens is designed to compensate for the difference in the remaining peripheral aberration caused by the difference between the prescription power for which the addition lens was designed and the prescription power required by an individual patient at the far measurement position and the near measurement position.

[0090] Prism and prism thinning

[0091] When manufacturing progressive lenses using single vision rigid stock lenses as the base lens and the addition lens, it is difficult to obtain prism because the prism can only be introduced by laterally shifting the addition lens relative to the base lens. The physical diameters of the base lens and the addition lens and their respective prescriptions impose significant physical constraints on the amount of prism that can be introduced into the progressive lens.

[0092] For some applications, when a customized lens (e.g., a freeform lens or a lens manufactured by conventional methods using hard tools) is used as a base lens, a clinical prism is introduced into the base lens such that the progressive lens formed by the base lens and the add-on lens has a desired clinical prism correction at the prism reference point. Typically, the add-on lens is not well-suited for correcting the clinical prism. This is because, as described above, the add-on lens is generally not manufactured in a customized manner, and thus the patient's clinical prism is unknown at the time the add-on lens is manufactured.

[0093] Similar to the situation described above for clinical prism correction, for some applications, when a customized lens (e.g., a freeform lens or a lens manufactured by conventional methods using hard tools) is used as a base lens, prism thinning is introduced into the base lens. Typically, the add-on lens is not well-suited for prism thinning. This is because, as described above, the add-on lens is generally not manufactured in a customized manner, and thus the frame shape and fitting information are unknown at the time the add-on lens is manufactured and only become known when creating a separate order for a specific patient. Therefore, the adhesion of a single-vision base lens with prism thinning to the add-on lens will result in a lens with a thickness imbalance on the lens after edge processing. However, for some applications, an appropriate amount of prism thinning is introduced into a customized single-vision lens such that after the customized lens has been edge processed into the frame shape, there is a thickness difference between the top edge and the bottom edge of the customized lens, and this thickness difference between the top edge and the bottom edge of the customized lens at least partially compensates for the thickness difference between the top edge and the bottom edge of the add-on lens. Thus, when a progressive lens is formed by the combination of a customized base lens and an add-on lens (both of which have been edge processed into the frame shape), the entire progressive lens has the same thickness at its top edge and bottom edge (or the thickness difference between its top edge and bottom edge is less than if prism thinning had not been introduced into the customized single-vision lens).

[0094] For some alternative applications, prism thinning is applied to a customized base lens, but the prism thinning is applied such that: after the customized base lens has been edged to a frame shape, the relative thicknesses of the top and bottom edges of the customized base lens do not compensate for the thickness difference between the top and bottom edges of the additional lens. For example, prism thinning can be applied to a customized base lens such that after the customized base lens has been edged to a frame shape, the top and bottom edges of the customized base lens have the same or similar thicknesses (e.g., the difference in thickness is less than 10% of the smaller of the two thicknesses), and the additional lens is combined with the prism-thinned customized base lens such that there is a difference in thickness between the top and bottom edges of the overall progressive lens. For some such applications, a progressive lens is obtained that has an average thickness on the edged profile that is lower than the average thickness if the overall progressive lens (i.e., the combination of the base lens and the additional lens without edge balancing at the frame edges) had the same thickness at its top and bottom edges.

[0095] Now referring to Figure 2 , Figure 2 which is a schematic cross-sectional view of a combination lens 20 according to some applications of the present invention. As described above, the combination lens is composed of a base lens 22 and an additional lens 24, which are typically joined to each other via an adhesive 25. The additional lens is typically mass-produced such that the additional lens is not initially edged for a specific frame and has a pre-cut edge denoted by the letter "A" in Figure 2 . Typically, the thicknesses of the additional lens at its top and bottom edges are equal before the lens is edged. Typically, the lens is edged for a specific frame such that its edged profile is as indicated by the letter "C" in FIG. 3. As shown, once the additional lens is edged for the frame shape, the additional lens does not have equal thicknesses at its top and bottom edged profiles.

[0096] As described above, in some applications, a customized single-vision lens is designed to compensate for the thickness difference between the top and bottom edges of the additional lens while maintaining a thickness along the edge that is higher than the prescribed minimum thickness. The cross-sectional profile of such a lens is represented by a solid line, and its top and bottom edges are denoted by the letter "B" in Figure 2 . As can be observed, the thickness of the bottom edge B of the customized single-vision lens is less than the thickness of the top edge B of the customized single-vision lens, while the thickness of the bottom edged profile C of the additional lens is greater than the thickness of the top edged profile C of the customized single-vision lens. Thus, the customized single-vision lens is designed to compensate for the thickness difference between the top and bottom edges of the additional lens while maintaining a thickness along the edge that is higher than the prescribed minimum thickness.

[0097] Similarly as described above, in some alternative embodiments, prism thinning is applied to a customized base lens, but the prism thinning is applied such that after the customized base lens has been edged into a frame shape, the relative thicknesses of the top and bottom edges of the customized base lens do not compensate for the thickness difference between the top and bottom edges of the additional lens. This is indicated by the dashed curves within Figure 2 the customized single vision lens 22 within. For some applications, the outer surface of the customized single vision lens 22 is as shown by the dashed curves. As shown, in some applications, the customized single vision lens 22 has equal thicknesses at the top edge B and the bottom edge B while maintaining a thickness along the edges that is higher than the minimum thickness of the prescription. Typically, in such cases, there is a difference in the thicknesses at the top and bottom edges of the combined lens. Further typically, as shown, in such cases, the combined lens has an average maximum thickness on the edged profile that is lower than the average maximum thickness if the combined lens had the same thickness at its top and bottom edges.

[0098] Thickness optimization

[0099] Those familiar with ophthalmic lens manufacturing and dispensing know that trade - offs must be considered when determining lens thickness. On the one hand, thinner lenses are more aesthetically appealing and are more comfortable to wear as glasses due to their lighter weight. On the other hand, the lens must be thick enough to be structurally robust enough to meet the requirements specified by industry standards. Thus, the goal is to produce a lens that is as thin as possible but still thick enough to be robust to mechanical trauma within industry standards. In lens manufacturing, for a given material with a given refractive index, this is typically achieved by assigning minimum thickness values to different regions within the lens and manufacturing the lens such that its minimum thickness in at least one region (and typically only one region) is exactly as thick as the minimum of the prescription. Such regions typically include the edges of the edged lens (once the lens has been cut to fit into a frame), the prism reference point (also known as the PRP, which is the technical term for a point near the center of the lens), and / or the areas of the lens to be drilled for inserting screws. In most cases, the thicknesses in other regions will be greater than the minimum thickness required to obtain sufficient structural strength within these regions.

[0100] For example, negative power lenses tend to be rather thick at the edges of the lens, but just thick enough at the center of the lens to have sufficient structural strength. In contrast, positive power lenses are typically thicker at the center of the lens and just thick enough at the edges to achieve sufficient structural strength. In the former case, where the lens is thin at the center and thick at the edges, once edge treated to a particular frame shape, the diameter of the lens before edge treatment does not affect the thickness of the lens. However, in the second case, where the minimum thickness at the edges is right at the limit of strength, the size of the uncut diameter before edge treatment has a direct impact on the thickness of the lens after edge treatment. In this case, before edge treatment, the larger the unedge treated lens, the thicker the lens will be at the center of the lens after edge treatment for each individual frame shape. Thus, it is clear that in the second case described above, using an unedge treated lens diameter that is optimal for each frame shape is an important factor in providing the thinnest possible lenses.

[0101] In the case of progressive lenses formed using a rigid stock lens as the base lens, the stock lens typically has a preset diameter (i.e., the lens diameter cannot be changed according to an individual frame shape). Based on the above explanation, some of the resulting lenses will be too thick because the preset diameter used to produce them is not optimized for the frame shape. According to some applications, the base lens is a custom base lens that is formed to have an unedge treated diameter that is optimized to fit a given frame shape (which typically means the lens is cut to the shape of the frame and some spare area required for edge treatment processing at the edges). This can reduce the lens thickness relative to if the base lens were a stock base lens manufactured with a preset unedge treated diameter that is independent of the frame shape, in cases where a driving thickness for maintaining sufficient strength is at the edges of the lens.

[0102] For some applications, using a customized lens as a base lens can also be used to reduce the thickness of the resulting progressive lens using the following mechanism. Since the base lens is designated to be edged and mounted in a frame only after the add-on lens is adhered to it, the base lens can be manufactured to have a thickness that results in a structural strength below a threshold (e.g., a thickness such that if the base lens were tested independently, it would not be structurally strong enough to withstand mechanical trauma according to industry standards). Similarly, the add-on lens can be manufactured to have a thickness that results in a structural strength below a threshold (e.g., a thickness such that if the add-on lens were tested alone, it would not be structurally strong enough to withstand mechanical trauma according to industry standards). However, the base lens and the add-on lens can be designed such that their combined structural strength is above the threshold (e.g., above or at industry standards). Alternatively or additionally, the adhesive 25 used to adhere the base lens to the add-on lens can act as a shock absorber such that the combined structural strength of the entire progressive lens is greater than the combination of the base lens and the add-on lens without the adhesive. Thus, although the combination of a customized single-vision base lens and an add-on lens may also have a structural strength below the threshold in a given area, in some embodiments, the adhesive acts as a shock absorber such that the progressive lens has a structural strength above the threshold in that given area.

[0103] Advantages compared to using a customized single-piece progressive lens

[0104] As described above, using a combination of a customized single-vision base lens (e.g., a freeform base lens) and an add-on lens to manufacture a progressive lens can provide one or more advantages over using a single-piece customized progressive lens (e.g., a single-piece freeform lens). Some of these advantages are as follows:

[0105] Thickness optimization

[0106] As described above, for some applications, using a customized single-vision lens (e.g., a freeform lens) as a base lens in combination with an add-on lens that provides progressive near vision correction can be used to reduce the thickness of the progressive lens relative to a single-piece customized progressive lens using the following mechanism. Since the customized base lens is intended to be edged and mounted in a frame only after the add-on lens is adhered to it, the base lens can be manufactured to have a minimum thickness that would render it structurally not strong enough to withstand mechanical trauma according to industry standards if tested independently. Similarly, the add-on lens can be manufactured to have a minimum thickness that would render it structurally not strong enough to withstand mechanical trauma according to industry standards if tested alone. However, as described above, the base lens and the add-on lens can be designed such that their combined structural strength is above or at industry standards.

[0107] For some applications, the adhesive 25 used to adhere the base lens to the add-on lens can act as a shock absorber, such that the combined structural strength of the entire progressive lens is greater than the combination of the base lens and the add-on lens in the absence of the adhesive. The effect of the adhesive on the impact resistance of laminated plastics is described in the technical report "Effect of Adhesive on the Impact Resistance of Laminated Plastics for Windshield Applications" by Joyce L. Illinger and Robert W. Lewis (Organic Materials Research for Army Materiel Agency Accession Number DAOD4693, August 1973). The abstract of the technical report states that forming a laminate using certain adhesives (flexible, transparent, multiblock polyurethane adhesives) was found to increase the antiballistic properties of the laminate by approximately 40% relative to laminates formed by clamping. For some applications, the adhesive used to adhere the base lens to the add-on lens is used in a manner roughly similar to that described in the aforementioned technical report, where the adhesive is configured to increase the impact resistance of the entire progressive lens relative to the impact resistance of the combination of the base lens and the add-on lens in the absence of the adhesive.

[0108] For some applications, the adhesive 25 also plays an important role in the safety of the glasses upon impact. This is because, even if the base lens or the add-on lens shatters upon impact, the adhesive keeps the fragments adhered together and reduces their dispersion to a greater extent compared to a custom single-piece progressive lens that does not contain the adhesive within its body.

[0109] Thus, for some applications, by using a combination of different materials for the base freeform lens and the add-on lens, and / or by applying an adhesive layer between the base freeform lens and the add-on lens, the entire progressive lens has a greater structural strength than if the lens were formed from a single material (e.g., the material of the freeform lens). Therefore, a progressive lens with a lower total thickness can achieve an industry-standard structural strength compared to using a single-piece custom lens as the progressive lens.

[0110] Reduced manufacturing time

[0111] Typically, after a custom lens (e.g., a freeform lens) is fabricated, one or more functional coatings are applied to the front surface and / or the back surface of the lens, such as a hard coating, an anti-reflective coating, a superhydrophobic coating, an anti-static coating, a cleaning coating, a blue light filter, a reflective coating, an anti-UV coating, a photochromic coating, a polarization coating, a tinted coating, a mirror coating, or any combination thereof. More typically, this increases the manufacturing time of the lens because the fabrication of the lens takes time and the application of the functional coatings takes additional time and can only be performed after the lens has been fabricated. As described above, an additional lens is typically coupled to the back side of the custom base lens. Typically, for such applications, one or more functional coatings are pre-applied to the front surface of the custom base lens, and the back surface of the custom base lens is fabricated according to the specific needs of the patient. More typically, one or more functional coatings are pre-applied to the back surface of the additional lens. (It should be noted that the coatings applied to the back surface of the additional lens are not necessarily the same as the coatings applied to the front surface of the custom base lens.) Thus, once the custom base lens has been fabricated and the additional lens is adhered to the base lens, the functional coatings are in place on the front surface and / or the back surface of the progressive lens. Typically, this requires much less time than is required to apply the functional coatings to a single-piece custom lens (e.g., a freeform lens). For some applications, the additional lens is coupled to the front side of the custom base lens, in which case the front surface of the additional lens and the back surface of the base lens are typically coated with the pre-applied coatings.

[0112] In many cases, lens coatings cannot be applied cost-effectively on a per-lens basis and must be done in batches of several lenses. Lenses waiting to be coated can sit idle for a significant amount of time before enough lenses have accumulated to fully fill a batch in the coating machine. For this reason, the alternative production methods described above can typically achieve significant savings in production time that are greater than just the coating process cycle time.

[0113] Those skilled in the art will recognize that the present invention is not limited to what has been specifically shown and described above. Rather, the scope of the present invention includes combinations and sub-combinations of the various features described above, as well as variations and modifications of these features that are not in the prior art and that will occur to those skilled in the art upon reading the foregoing description.

Claims

1. A device for use with an eyeglass frame to be worn by a wearer, the device comprising: A progressive lens configured to provide a distance vision correction function and a near vision correction function, the progressive lens comprising: - A customized single vision base lens configured to provide at least a part of the distance vision correction function, the customized lens being shaped to conform to the ophthalmic requirements of the wearer and / or the requirements of the eyeglass frame; and - An additional lens coupled to the customized single vision base lens, the additional lens being configured to provide a progressive near vision correction function.

2. The device according to claim 1, wherein The customized single vision base lens provides all of the distance vision correction function of the progressive lens.

3. The device according to claim 1, wherein, The customized single vision base lens provides only a part of the distance vision correction function of the progressive lens, and the additional lens provides the remaining part of the distance vision correction function of the progressive lens.

4. The device according to claim 1, wherein The additional lens is an off-the-shelf lens.

5. The device according to claim 1, wherein, The customized single vision base lens is a freeform lens.

6. The apparatus according to claim 1, wherein, The customized single vision base lens is a customized single vision base lens formed by cutting and polishing using a hard tool.

7. The apparatus according to claim 1, wherein The customized single vision base lens is shaped to conform to the ophthalmic requirements of the wearer, the ophthalmic requirements of the wearer being selected from the group consisting of sphere, cylinder, and axis.

8. The device according to claim 1, wherein The customized single vision base lens is formed with a single vision refractive characteristic that is calculated to create a wear prescription that incorporates the personalized ophthalmic parameters of the wearer.

9. The apparatus according to claim 1, wherein The customized single vision base lens is shaped to compensate for any effect on the personalized ophthalmic parameters that will be caused by the coupling of the additional lens to the customized single vision lens.

10. The device according to claim 1, wherein The customized single vision base lens is shaped to conform to the clinical prism prescription of the wearer such that the progressive lens has a desired clinical prism correction at the prism reference point of the progressive lens.

11. The device according to claim 1, wherein, There is a thickness difference between the top edge and the bottom edge of the additional lens, and wherein prism thinning is introduced into the customized single vision base lens such that there is a thickness difference between the top edge and the bottom edge of the customized single vision base lens, the thickness difference between the top edge and the bottom edge of the customized single vision base lens at least partially compensates for the thickness difference between the top edge and the bottom edge of the additional lens.

12. The device according to claim 1, wherein Remainder optical characteristics are added to the periphery of the customized single vision base lens to compensate for unwanted remainder peripheral aberrations caused by the difference between the prescription for which the additional lens is designed and the prescription required by the wearer.

13. The apparatus according to claim 1, wherein The customized single vision base lens is shaped to have an unedged diameter that is optimized to fit the shape of the frame of the eyeglasses.

14. The device according to claim 1, wherein, Each of the customized single vision base lens and the additional lens has a thickness at a given region that results in the lens having a structural strength below a given threshold for that region, but the progressive lens has a structural strength above the threshold at the given region.

15. The device according to claim 1, wherein, The combination of the customized single-vision base lens and the add-on lens has a structural strength below a threshold value in a given region, and wherein the add-on lens is coupled to the customized single-vision base lens using an adhesive that acts as a shock absorber, such that the progressive lens has a structural strength above the threshold value in the given region.

16. The device according to any one of claims 1 to 15, wherein, Remaining optical characteristics are added to the periphery of the customized single-vision base lens to compensate for a mismatch between the bevel face curvature of the bezel for which the add-on lens is designed and the bevel face curvature of the frame of the eyewear.

17. The apparatus according to claim 16, wherein, The added remaining optical characteristics are configured to take into account a plurality of personalized ophthalmic parameters of the wearer.

18. The apparatus according to claim 17, wherein, The added remaining optical characteristics are configured to take into account one or more personalized ophthalmic parameters of the wearer, the one or more personalized ophthalmic parameters of the wearer being selected from the group consisting of: back vertex distance, pantoscopic tilt, and prism.

19. The device according to any one of claims 1 to 15, wherein, The progressive lens includes one or more functional coatings, the one or more functional coatings being pre-applied to at least one of the front surface of the progressive lens and the back surface of the progressive lens before the add-on lens is coupled to the customized single-vision base lens.

20. The apparatus of claim 19, wherein the one or more functional coatings include one or more functional coatings selected from the list consisting of: hard coat, anti-reflective coating, superhydrophobic coating, antistatic coating, cleaning coating, blue light filter, reflective coating, anti-UV coating, photochromic coating, tinted coating, and mirror coating.

21. The apparatus according to claim 19, wherein, The progressive lens includes a first set of one or more functional coatings and includes a second set of one or more functional coatings, the first set of one or more functional coatings being pre-applied to the front surface of the progressive lens and the second set of one or more functional coatings being pre-applied to the back surface of the progressive lens before the add-on lens is coupled to the customized single-vision base lens.

22. The device according to claim 21, wherein, The first set of one or more functional coatings pre-applied to the front surface of the progressive lens is the same as the second set of one or more functional coatings pre-applied to the back surface of the progressive lens.

23. The apparatus according to claim 21, wherein The first set of one or more functional coatings pre-applied to the front surface of the progressive lens is different from the second set of one or more functional coatings pre-applied to the back surface of the progressive lens.

24. The device according to any one of claims 1 - 15, wherein There is a thickness difference between the top edge and the bottom edge of the add-on lens, and wherein prism thinning is introduced into the customized single-vision base lens such that the top edge and the bottom edge of the customized single-vision base lens do not compensate for the thickness difference between the top edge and the bottom edge of the add-on lens, such that there is a difference in the thickness between the top edge and the bottom edge of the progressive lens.

25. The apparatus according to claim 24, wherein, The average thickness of the progressive lens on the profile after edge treatment is lower than the average thickness in the case where the customized single-vision lens is prism thinned such that the top edge and the bottom edge of the customized single-vision base lens compensate for the thickness difference between the top edge and the bottom edge of the add-on lens.

26. The device according to any one of claims 1-15, wherein, The customized single-vision base lens includes one or more corrections selected from the group consisting of: aspheric correction, anti-fatigue correction, tilt aberration correction, and / or myopia control correction.

27. The apparatus according to claim 26, wherein, The one or more selected corrections cause the average power of the customized single-vision base lens at the near vision measurement position to change by no more than 0.125 diopters relative to the average power of the customized single-vision base lens at the far vision measurement position.

28. A method for use with an eyewear frame to be worn by a wearer, the method comprising: Manufacturing a progressive lens for placement in the eyewear frame by: Coupling a customized single-vision base lens and an add-on lens to each other, The customized single-vision base lens being configured to provide at least a portion of the far vision correction function, the customized lens being formed to conform to the ophthalmic requirements of the wearer and / or the requirements of the eyewear frame; and The add-on lens being coupled to the customized single-vision base lens, the add-on lens being configured to provide progressive near vision correction function.

29. The method according to claim 28, wherein, The customized single-vision base lens provides all of the far vision correction function of the progressive lens.

30. The method according to claim 28, wherein The customized single-vision base lens provides only a portion of the far vision correction function of the progressive lens, and the add-on lens provides the remaining portion of the far vision correction function of the progressive lens.

31. The method according to claim 28, wherein the add-on lens is a stock lens.

32. The method according to claim 28, wherein The customized single-vision base lens is a freeform lens.

33. The method according to claim 28, wherein The customized single-vision base lens is a customized single-vision base lens formed by cutting and polishing using a hard tool.

34. The method according to claim 28, wherein The customized single-vision base lens is formed to conform to the ophthalmic requirements of the wearer, the ophthalmic requirements of the wearer being selected from the group consisting of: sphere, cylinder, and axis.

35. The method according to claim 28, wherein, The customized single-vision base lens is formed with a single-vision refractive characteristic that is calculated to create a wear prescription that incorporates the ophthalmic needs of the wearer.

36. The method according to claim 28, wherein The customized single-vision base lens is formed to compensate for any effect on the personalized ophthalmic parameters that will be caused by the coupling of the add-on lens and the customized single-vision lens.

37. The method according to claim 28, wherein The customized single-vision base lens is formed to conform to the clinical prism prescription of the wearer such that the progressive lens has the desired clinical prism correction at the prism reference point of the progressive lens.

38. The method according to claim 28, wherein, There is a thickness difference between the top edge and the bottom edge of the add-on lens, and wherein the customized single-vision base lens has been prism thinned such that there is a thickness difference between the top edge and the bottom edge of the customized single-vision base lens, the thickness difference between the top edge and the bottom edge of the customized single-vision base lens at least partially compensates for the thickness difference between the top edge and the bottom edge of the add-on lens.

39. The method according to claim 28, wherein The customized single-vision base lens has additional optical characteristics added to its periphery to compensate for unwanted peripheral aberrations caused by the difference between the prescription power for which the add-on lens is designed and the prescription required by the wearer.

40. The method according to claim 28, wherein, The customized single-vision base lens includes a customized single-vision base lens formed to have an unedged diameter that is optimized to fit the shape of the frame of the eyewear.

41. The method according to claim 28, wherein each of the customized single-vision base lens and the additional lens has a thickness at a given region that results in the lens having a structural strength below a given threshold for that region, and wherein coupling the customized single-vision base lens to the additional lens includes forming a progressive lens having a structural strength above the threshold at the given region.

42. The method according to claim 28, wherein the combination of the customized single-vision base lens and the additional lens has a structural strength below a threshold for a given region, and wherein coupling the customized single-vision base lens to the additional lens includes coupling the customized single-vision base lens to the additional lens using an adhesive that acts as a shock absorber such that the progressive lens has a structural strength above the threshold at the given region.

43. The method according to any one of claims 28 - 42, wherein, The customized single-vision base lens includes a customized single-vision base lens to which additional optical properties have been added at its periphery to compensate for a mismatch between the bevel facial curvature for which the additional lens is designed and the bevel facial curvature of the frame of the eyewear.

44. The method according to claim 43, wherein, The additional optical properties are configured to take into account a plurality of personalized ophthalmic parameters of the wearer.

45. The method according to claim 43, wherein The additional optical properties are configured to take into account one or more personalized ophthalmic parameters of the wearer, the one or more personalized ophthalmic parameters of the wearer being selected from the group consisting of: back vertex distance, pantoscopic tilt, and prism.

46. The method according to any one of claims 28 - 42, wherein Coupling the customized single-vision base lens to the additional lens includes: coupling the customized single-vision base lens to the additional lens with the additional lens, in the case where one or more functional coatings have been pre-applied to at least one of the front surface and the back surface of the progressive lens, before the customized single-vision base lens is coupled to the additional lens.

47. The method according to claim 46, wherein the one or more functional coatings include one or more functional coatings selected from the list consisting of: hard coat, anti-reflective coating, superhydrophobic coating, antistatic coating, cleaning coating, blue light filter, reflective coating, anti-UV coating, photochromic coating, coloring coating, and mirror coating.

48. The method according to claim 46, wherein, Coupling the customized single-vision base lens to the additional lens includes: coupling the customized single-vision base lens to the additional lens, in the case where a first set of one or more functional coatings has been pre-applied to the front surface of the progressive lens and a second set of one or more functional coatings has been pre-applied to the back surface of the progressive lens, before the customized single-vision base lens is coupled to the additional lens.

49. The method according to claim 48, wherein, The first set of one or more functional coatings pre-applied to the front surface of the progressive lens is the same as the second set of one or more functional coatings pre-applied to the back surface of the progressive lens.

50. The method according to claim 48, wherein, The first set of one or more functional coatings pre-applied to the front surface of the progressive lens is different from the second set of one or more functional coatings pre-applied to the rear surface of the progressive lens.

51. The method according to any one of claims 28-42, wherein, There is a thickness difference between the top edge and the bottom edge of the add-on lens, and the customized single-vision base lens includes a customized single-vision base lens to which prism thinning has been applied, such that the top edge and the bottom edge of the customized single-vision base lens do not compensate for the thickness difference between the top edge and the bottom edge of the add-on lens, such that there is a difference in thickness between the top edge and the bottom edge of the progressive lens.

52. The method according to claim 51, wherein, The average thickness of the progressive lens on the profile after its edge treatment is lower than the average thickness if the customized single-vision lens is prism thinned such that the top edge and the bottom edge of the customized single-vision base lens compensate for the thickness difference between the top edge and the bottom edge of the add-on lens.

53. The method according to any one of claims 28 - 42, wherein, The customized single-vision base lens includes one or more corrections selected from the group consisting of: aspheric correction, anti-fatigue correction, tilt aberration correction, and / or myopia control correction.

54. The method according to claim 53, wherein, The one or more corrections selected cause the average power of the customized single-vision base lens at the near vision measurement position to change by no more than 0.125 diopters relative to the average power of the customized single-vision base lens at the far vision measurement position.

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