A type of bi-prism peripheral defocus lens

Abstract

This invention relates to a bifocal prism lens with peripheral defocus in a localized area. The lens has a central area and a peripheral area on its front and rear surfaces. The central area of ​​the rear surface has a concave lens, while the nasal, temporal, and upper quadrant areas of the peripheral area have refractive convex lenses. The central area of ​​the front surface is a plano lens, while the nasal, temporal, and upper quadrant areas of the peripheral area have spherical microlens-type convex lenses. A refractive convex lens compound prism is located in the lower quadrant area of ​​one side of the lens. The superior advantages of this lens are that the optical center of the central area of ​​the rear surface is located below the geometric center of the lens; the vertical diameter of the lower quadrant is longer than that of the upper quadrant; the horizontal diameter of the lower quadrant is longer than that of the upper quadrant; the diameter of the lower quadrant is larger than that of the upper quadrant; and the area of ​​the lower quadrant is larger than that of the upper quadrant, resulting in a wide near vision field.

Description

Technical Field

[0001] This invention belongs to the field of eyeglasses technology, and particularly relates to a bi-prism lens with peripheral defocus in a localized area. Background Technology

[0002] When the eye focuses on near objects, a three-pronged physiological response occurs: pupil constriction, increased accommodation, and increased convergence. Accommodation and convergence are parallel, inseparable, and synergistic physiological responses. Using a convex lens alone merely reduces accommodative force and inevitably leads to dysfunction of both accommodation and convergence.

[0003] The combination of a convex lens and a prism is called a bifocal lens, which has a reliable effect on myopia control in children and adolescents. The 2019 Consensus Paper on Myopia Management states that bifocal lenses slow axial length by an average of 0.009 mm / year and myopia progression by an average of 0.34D / year, delaying myopia progression by 50%-60%. It also points out that bifocal lenses restore the natural balance of accommodation and convergence, improve accommodative response using a near-vision convex lens, and effectively compensate for the additional fusion requirements caused by near vision using a prism with its base facing the nose, without interfering with the balance of accommodation and binocular vision, making near vision equal to distance vision.

[0004] The causes of myopia in children and adolescents are impaired near vision accommodation and peripheral hyperopic defocus of the retina. The 2022 White Paper on Myopia Management points out that the pathogenesis of myopia is accommodative lag and peripheral defocus, and glasses for the prevention and control of myopia in adolescents should have dual corrective functions.

[0005] The "Guideline for Prescribing Defocus Design Frames" published in the journal "Glass, Enamel & Eyeglasses" in 2023 recommends wearing defocus design frame glasses in conjunction with accommodative training to increase accommodative sensitivity and reduce accommodative lag. It also suggests that individuals with accommodative dysfunction can wear defocus design glasses and receive appropriate visual function training. Furthermore, it recommends that individuals with manifest strabismus and intermittent strabismus are not suitable for wearing defocus design glasses.

[0006] Peripheral defocus glasses, whether refractive or microlens-type, have a convex lens on the lower side. While correcting peripheral hyperopic defocus of the retina, they inevitably cause dysfunction in the eye's accommodation and convergence functions. Defocus-designed glasses are more suitable for myopia with excessive accommodation accompanied by esophoria. Only 10% of myopia in Chinese children and adolescents is accompanied by esophoria, of which 20% have normal eye position and 70% have exophoria. Therefore, it can be said that at least 80% of exophoria and normal eye position individuals are not suitable for wearing defocus-designed glasses, or in other words, wearing defocus glasses should avoid damaging or restoring the eye's normal accommodation and convergence functions.

[0007] The increase in myopia in teenagers is caused by peripheral hyperopic defocus of the retina. Defocus-designed glasses such as Zeiss Growing-Up, Zeiss Little Joy, Hoya New Joy, and Essilor Star Control have become mainstream products for myopia prevention and control in teenagers. These products are designed with a ring defocus, which means they are designed based on the initial defocus theory and the non-local area defocus theory. These products cannot eliminate or aggravate the asymmetrical defocus of the nasotemporal peripheral refractive power. These products damage the normal accommodation and convergence functions of the eye and have design defects and deficiencies.

[0008] Smith El., the founder of peripheral defocus theory and inventor of defocus lenses, recently used rhesus monkey experiments and myopia nasotemporal peripheral refractive tests to critically point out the design flaws in his original ring-shaped peripheral defocus lenses, which placed the functional area in the 360° peripheral region. He proposed that the induction of eyeball growth is caused by temporal peripheral hyperopic defocus and anisometropia of the nasotemporal peripheral retina. This design, with asymmetrical refractive power between the nasal and temporal sides, conforms to the localized defocus theory. Such lenses are called localized peripheral defocus lenses, or nasotemporal peripheral defocus lenses, and compared to ring-shaped defocus lenses, they better reflect the peripheral refractive changes in myopia and eliminate anisometropia.

[0009] In summary, existing defocused eyeglass lenses still suffer from damage or cause accommodative and convergence dysfunction, and have design flaws and shortcomings that prevent them from correcting anisometropia caused by hyperopic defocus on the nasotemporal periphery of the retina.

[0010] Bifocal prisms are 50%-60% effective in controlling myopia, refractive defocus lenses are 30% effective, and microlens defocus lenses are 67% effective. Combining bifocal prisms with refractive defocus lenses or with microlens-type nasotemporal defocus lenses better aligns with the theories of eye accommodation convergence and localized asymmetric defocus. This increases the indications for these lenses, enhances their effectiveness, and eliminates the design defects of peripheral defocus lenses that cause accommodative and convergence dysfunction.

[0011] Among the published invention patent application documents, Chinese invention patent application number 202211532749.1

[0012] A defocused spectacle lens, a design method, and spectacle lenses are disclosed. The defocused spectacle lens includes a master lens, which includes an optical center and a first region and a second region symmetrical about the optical center. Multiple sets of first microlenses are disposed in the first region, and the first microlenses and the master lens together form a first refractive zone. Multiple sets of second microlenses are disposed in the second region, and the second microlenses and the master lens together form a second refractive zone. The defocus amount of the first refractive zone has a maximum value D1max and a minimum value D1min, and the defocus amount of the second refractive zone has a maximum value D2max and a minimum value D2min, satisfying: D2min>D1min, D2max.

[0013] For example, Chinese invention patent application number 202111107835.3 provides a defocused eyeglass lens with a microlens array, a design method, and eyeglasses. This defocused eyeglass lens with a microlens array includes a first surface and a second surface opposite the first surface. A regular polygonal grid region is set outside the visible region of the first surface. Microlenses are disposed within each regular polygonal grid. The regular polygonal grid region is located within a field of view of 20-70 degrees outside the visible region of the first surface. The regular polygonal grid is a regular hexagonal grid or a regular octagonal grid. This defocused eyeglass lens is designed according to the preset energy ratio entering the human eye, which can greatly improve the wearer's experience.

[0014] For example, Chinese invention patent application number 2310583262.4 discloses a hybrid refractive lens, which includes a central lens region and at least one peripheral lens region joined with the central lens region. The surfaces of the central lens region and each of the peripheral lens regions are the same or different surface types. The surface types of the central lens region and the at least one peripheral lens region are refractive freeform surfaces, diffractive freeform surfaces, or a hybrid refractive-diffractive freeform surface.

[0015] The lenses in the outer lens area have the same or different surface shapes, which reduces the thickness of the eyeglasses and improves user comfort.

[0016] None of the invention patent applications disclosed above provide a combination of bi-xenon prisms and peripheral defocus lenses suitable for myopia control in children and adolescents. There is an urgent need to develop a new eyeglass design, namely bi-xenon prisms and peripheral defocus lenses. Summary of the Invention

[0017] The purpose of this invention is to address the problems existing in the prior art. Existing bi-prisms cannot correct peripheral hyperopic anisometropia in myopia, and existing peripheral defocus lenses cannot correct asymmetrical hyperopic defocus of the retina. Furthermore, the convex lens in the lower quadrant of peripheral defocus lenses impairs the eye's accommodation and convergence functions. This invention provides a bi-prism lens with localized peripheral defocus.

[0018] The objective of this invention is achieved through the following technical solution:

[0019] A bifocal prism peripheral defocus lens is a frame lens combining a bifocal prism and corrective lenses for peripheral defocus on the nasotemporal retina. The lens has a central area and a peripheral area on its front and rear surfaces. The central area of ​​the rear surface has a concave lens, and the nasal, temporal, and upper quadrant areas of the peripheral area have refractive convex lenses. The central area of ​​the front surface is a plano lens, and the nasal, temporal, and upper quadrant areas of the peripheral area have spherical microlens-type convex lenses. A refractive convex lens-prism combination is located in the lower quadrant area of ​​one side of the lens, or a refractive convex lens and a prism are respectively located on the front and rear surfaces. The lens design parameters satisfy the following:

[0020] The optical center of the central area of ​​the rear lens is located 0.5 mm to 5.0 mm below the geometric center of the lens;

[0021] The refractive power of the combination of the anterior and posterior mirror surfaces in the nasal quadrant is greater than that of the combination of the anterior and posterior mirror surfaces in the temporal quadrant by +0.50D to +3.00D.

[0022] The length of the vertical diameter in the lower quadrant of the rear mirror is 0.5 mm to 6.0 mm longer than the length of the vertical diameter in the upper quadrant of the rear mirror, and the length of the horizontal diameter in the lower quadrant of the rear mirror is 0.5 mm to 6.0 mm longer than the length of the horizontal diameter in the upper quadrant of the rear mirror.

[0023] The area of ​​the lower quadrant of the rear mirror is 4.0 mm larger than the area of ​​the upper quadrant of the rear mirror. 2 Up to 20.0mm 2 The lower quadrant of the rear mirror is equipped with a convex lens with a positive additive refractive power of +0.75D to +2.50D relative to the central zone, and the lower quadrant is equipped with a prism with a power of 1.0△ to 4.0△. The prism base faces the nasal side, with a diameter of 10mm to 50mm, a diameter of 3mm to 20mm, and a base thickness of 0.1mm to 4.0mm.

[0024] Furthermore, the diameter of the central area of ​​the posterior mirror is 5.0 mm to 13.0 mm, and the refractive power is 0.00 D to -10.00 D. The diameters of the nasal quadrant, temporal quadrant, upper quadrant, and lower quadrant of the posterior mirror are 15 mm to 35 mm, and a gradient zone of 1.0 mm to 6.0 mm is provided. The diameter of the lower quadrant of the posterior mirror is 2.0 mm to 6.0 mm larger than the diameter of the upper quadrant.

[0025] Furthermore, the lower quadrant prism has a diameter of 15mm to 35mm, a diameter of 4mm to 15mm, and a base thickness of 0.25mm to 1.5mm.

[0026] Furthermore, the refractive convex lens in the lower quadrant and the prism in the lower quadrant are set on the same side mirror surface, or on the front and rear mirror surfaces respectively.

[0027] Furthermore, a refractive convex lens is provided in the nasal quadrant, temporal quadrant, and lower quadrant of the rear mirror, and a refractive convex lens compound prism is provided in the lower quadrant of the rear mirror, or a prism is provided in the lower quadrant of the front mirror.

[0028] Furthermore, a refractive convex lens is provided in the nasal quadrant, temporal quadrant, and upper quadrant of the rear mirror surface; a microlens-type convex lens is provided in the nasal quadrant, temporal quadrant, and upper quadrant of the front mirror surface; and a refractive convex lens compound prism is provided in the lower quadrant of the rear mirror surface, or a prism is provided in the lower quadrant of the front mirror surface.

[0029] Furthermore, the two prisms in the lower quadrant of the posterior or anterior mirror are arranged horizontally and radially, with the prism power of the prism closer to the nose being 0.25△ to 0.50△ greater than that of the prism on the temporal side.

[0030] Furthermore, in the lower quadrant of the rear or front mirror, two prisms are arranged vertically and radially, with the prism power of the prism closer to the lower side being 0.25△ to 0.50△ greater than that of the prism on the upper side.

[0031] Furthermore, the technical parameters for the combined refractive power of the anterior and posterior mirrors are as follows: nasal quadrant +0.75D to +5.00D, temporal quadrant +0.50D to +4.75D, upper quadrant +0.00D to +4.50D, lower quadrant +1.50D to +2.50D, with at least the nasal quadrant > the temporal quadrant +0.50D to +2.50D. A convex lens power of +2.00D in the lower quadrant corresponds to a prism power of 3.0△; a convex lens power of +1.50D in the lower quadrant corresponds to a prism power of 2.0△; a convex lens power of +1.00D in the lower quadrant corresponds to a prism power of 1.5△; and a prism power of +0.75D in the lower quadrant corresponds to a prism power of 1.0△.

[0032] Furthermore, the aforementioned lenses are mounted on single-layer eyeglass frames, additional eyeglass frames for double-layer eyeglass frames, or modular eyeglass frames.

[0033] Compared with the closest prior art in this field, the spectacle lens described in this invention has the following superior technical effects:

[0034] 1. The bi-prism of the spectacle lens of the present invention has a peripheral retinal defocus correction function and can correct peripheral hyperopic anisometropia.

[0035] 2. The optical center of the rear lens of the spectacle lens of the present invention is located below the geometric center of the spectacle lens, the vertical diameter of the lower quadrant is longer than the vertical diameter of the upper quadrant, the horizontal diameter of the lower quadrant is longer than the horizontal diameter of the upper quadrant, the diameter of the lower quadrant is larger than the diameter of the upper quadrant, and the area of ​​the lower quadrant is larger than the area of ​​the upper quadrant, thus having a wide field of vision for near vision.

[0036] 3. The spectacle lens described in this invention can reduce accommodation, balance accommodation, and convergence functions when viewing near objects. By setting a prism, it can make near vision equal to distance vision. The local area peripheral defocus spectacle lens corrects anisometropia of hyperopia on the nasotemporal side of the retina. This spectacle lens has dual correction functions of bi-prism and local area peripheral defocus, which increases the indications and improves the effectiveness, creating a new type of spectacle lens suitable for myopia prevention and control in children and adolescents. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of a compound prism consisting of a convex lens in the nasotemporal quadrant of the rear mirror and a convex lens in the lower quadrant of the front mirror.

[0038] Figure 2 This is a schematic diagram of a compound prism consisting of a convex lens in the upper nasal and temporal quadrants and a convex lens in the lower quadrants.

[0039] Figure 3 This is a structural diagram showing the vertical and horizontal radii of the lower quadrant of the rear mirror and the vertical and horizontal radii of the upper quadrant.

[0040] Figure 4 This is a schematic diagram of the structure of the optical center of the central area of ​​the rear lens and the geometric optical center of the spectacle lens.

[0041] Figure 5 This is a schematic diagram of the structure of a microlens-type convex lens in the superior nasotemporal quadrant of the anterior mirror surface.

[0042] Figure 6 This is a schematic diagram of a compound prism with a refractive convex lens in the lower quadrant of the front mirror.

[0043] Figure 7 This is a schematic diagram of the structure of the prism in the lower quadrant of the front mirror and the refractive convex lens in the lower quadrant of the rear mirror.

[0044] Figure 8 This is a schematic diagram of a structure in which two prisms are arranged horizontally and radially in the lower quadrant of the front mirror.

[0045] Figure 9 This is a schematic diagram of the structure in which two prisms are arranged vertically and radially in the lower quadrant of the front mirror.

[0046] Figure 10This is a schematic diagram of the cross-sectional length, width, and base thickness of a prism.

[0047] The diagram shows: 1-Anterior mirror surface, 2-Posterior mirror surface, 3-Central area, 1.3-Central area of ​​the anterior mirror surface, 2.3-Central area of ​​the posterior mirror surface, 4-Peripheral area, 1.4-Peripheral area of ​​the anterior mirror surface, 2.4-Peripheral area of ​​the posterior mirror surface, 5-Nasal quadrant, 1.5-Nasal quadrant of the anterior mirror surface, 2.5-Nasal quadrant of the posterior mirror surface, 6-Temporal quadrant, 1.6-Temporal quadrant of the anterior mirror surface, 2.6-Temporal quadrant of the posterior mirror surface, 7-Upper quadrant, 1.7-Upper quadrant of the anterior mirror surface, 2.7-Upper quadrant of the posterior mirror surface, 8-Lower quadrant, 1.8-Lower quadrant of the anterior mirror surface. 2.8 - Lower quadrant of the rear lens, 9 - Circular, 10 - Gradient zone, 11 - Concave lens, 12 - Plane lens, 13 - Convex lens, 14 - Microlens, 15 - Prism, 16 - Prism diameter, 17 - Prism diameter, 18 - Prism base thickness, 19 - Nose side of prism base, 20 - Optical center of the central area of ​​the rear lens, 21 - Geometric center of the lens, 22 - Horizontal diameter of the upper quadrant of the rear lens, 23 - Horizontal diameter of the lower quadrant of the rear lens, 24 - Vertical diameter of the upper quadrant of the rear lens, 25 - Vertical diameter of the lower quadrant of the rear lens;

[0048] Symbol abbreviations: V - Vertical diameter; H - Horizontal diameter. Detailed Implementation

[0049] This invention further describes the technical solution of the spectacle lens in conjunction with the accompanying drawings. To better understand the spectacle lens of this invention, the meanings of relevant technical terms are briefly introduced below:

[0050] The lens in question refers to a combination of a bifocal lens and a peripherally defocused lens. The bifocal lens is a combination of a refractive convex lens and a triangular prism in the lower quadrant of the lens. The peripherally defocused lens corrects anisometropia in the nasotemporal quadrants, where the refractive power in the nasal quadrant is greater than that in the temporal quadrant. The lens is made of PC or resin material.

[0051] Refractive lenses are spherical or aspherical lenses that converge light to a single focal point after passing through the lens. They are the most common type of lens. The rear quadrant of this type of lens uses a convex lens with refractive power relative to the central quadrant, hence the name "refractive convex lens." Refractive lenses are manufactured using injection molding or machining, with machining being the preferred method. This method achieves a refractive power accuracy of 0.01D, and produces perfectly round or elliptical coaxial lenses with extremely low astigmatism.

[0052] Microlens eyeglasses consist of an array of multiple microlenses, resembling a compound eye or honeycomb structure. These convex lens-type microlens eyeglasses function as convex lenses and are manufactured using injection molding. The anterior quadrant of the eyeglasses described in this invention is configured as a microlens, with the anterior quadrant employing a convex lens with refractive power relative to the central region; hence, it is called a microlens-type convex lens. It is used to correct peripheral hyperopic defocus in myopic eyes, bringing the peripheral hyperopic defocus onto the retina, thereby slowing down the growth of the myopic eyeball. The concave lenses between the multiple microlenses improve central vision.

[0053] The spectacle lens of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0054] like Figures 1 to 5 As shown, the spectacle lens includes a front lens 1 and a rear lens 2, both of which are refractive surfaces.

[0055] Figure 1 The front mirror 1 has an upper quadrant 1.7 and the rear mirror 2 has an upper quadrant 2.7, which are designed for a windowed field of view. The central area 1.3 of the front mirror 1 is set as a plano lens 12, and the central area 2.3 of the rear mirror 2 is set as a concave lens 11, which extends upward. The lower quadrant 1.8 of the peripheral area 1.4 of the front mirror is set as a convex lens 13, and the composite base faces the prism base faces the nose side 19 of the prism 15.

[0056] A convex lens 13 in the nasal quadrant 2.5 and temporal quadrant 2.6 of the peripheral area 2.4 of the rear mirror 2 is provided with a circular convex lens 13. The convex lens 13 is provided with a gradient area 10, forming a composite prism structure of the nasal and temporal quadrant refractive convex lens of the rear mirror and the lower quadrant refractive convex lens of the front mirror.

[0057] The central area 2.3 of the rear mirror 2 is set as a concave lens 11, and the nasal quadrant 2.5, temporal quadrant 2.6, upper quadrant 2.7 and lower quadrant 2.8 of the peripheral area 2.4 of the rear mirror 2 are set as convex lenses 13. The convex lens 13 set in the lower quadrant 2.8 is combined with a prism 15 with its base facing the nasal side 19 to form a composite prism of the nasal temporal upper quadrant refractive convex lens and the lower quadrant refractive convex lens of the rear mirror.

[0058] Figure 3 The radial positions of the rear mirror 2 are shown. The rear mirror 2 is provided with a central area 2.3 and a peripheral area 2.4. The vertical radial line 25 of the lower quadrant area 2.8 of the peripheral area 2.4 is longer than the vertical radial line 24 of the upper quadrant area 2.7, and the horizontal radial line 23 of the lower quadrant area 2.8 is longer than the horizontal radial line 22 of the upper quadrant area 2.7, thus forming the position of the vertical and horizontal radial lines of the lower quadrant area of ​​the rear mirror and the vertical and horizontal radial lines of the upper quadrant area.

[0059] Figure 4 The rear lens 2 central region optical center 20 is shown in the central region 2.3 of the rear lens 2. The optical center 20 is located below the geometric optical center 21 of the spectacle lens.

[0060] like Figure 5 As shown, the anterior mirror 1 is provided with a central area 3 and a peripheral area 4. The central area 1.3 of the anterior mirror 1 is provided with a plano lens 12. The peripheral area 1.4 of the anterior mirror 1 is provided with four quadrants: nasal quadrant 5, temporal quadrant 6, upper quadrant 7, and lower quadrant 8. The nasal quadrant 1.5, temporal quadrant 1.6, and upper quadrant 1.7 of the four quadrants are provided with convex lenses 13 of microlenses 14. The lower quadrant 1.8 is provided with convex lenses 13, which constitutes the structure of the microlens-type convex lens 13 in the anterior mirror nasal temporal upper quadrant 1.7.

[0061] like Figure 6 As shown, the lower quadrant 1.8 of the front mirror is configured as a refractive convex lens 13 and a prism 15 with a composite substrate facing the nose side 19, forming a structure of a refractive convex lens 13 and a composite prism 15 in the lower quadrant 1.8 of the front mirror.

[0062] like Figure 7 As shown, a prism 15 with its base facing the nose side 19 is set in the lower quadrant region 1.8 of the front mirror 1, and a refractive convex lens 13 is set in the lower quadrant region 2.8 of the rear mirror 2, forming a structural schematic diagram of the prism in the lower quadrant region of the front mirror and the refractive convex lens in the lower quadrant region of the rear mirror.

[0063] like Figure 8 As shown, two prisms 15 are provided in the lower quadrant region 8 of the anterior mirror 1. The bases of the prisms 15 are arranged horizontally and radially towards the nasal side 19. The prism power of the prism 15 closer to the nasal side 19 is greater than that of the prism 15 on the temporal side, thus forming a structure in which the two prisms 15 in the lower quadrant region 8 are arranged horizontally and radially.

[0064] like Figure 9 As shown, two prisms 15 are provided in the lower quadrant region 8 of the front mirror 1. The base of the prisms 15 is facing the nose side 19 and arranged in a vertical radial direction. The prism power of the prism closer to the lower prism 15 is greater than that of the upper prism 15, thus forming a structure in which the two prisms 15 in the lower quadrant region 8 are arranged in a vertical radial direction.

[0065] Figure 10 The prism 15 is shown to have a prism diameter of 16, a prism width of 17, and a prism base thickness of 18.

[0066] Furthermore, the front lens 1 and the rear lens 2 of the spectacle lens are set as a central zone and a peripheral zone. The central zone 3 set on the rear lens 2 of the spectacle lens corrects central myopic defocus of the retina and provides distance vision. The nasotemporal quadrant 5 of the peripheral zone 4 corrects nasotemporal hyperopic anisometropia of the retina. The refractive convex lens compound prism in the lower quadrant 8 is used for balance accommodation and convergence natural balance.

[0067] Furthermore, the central area 3 of the spectacle lens is for correcting central myopic defocus of the retina. This type of spectacle lens is mainly used for near vision. Therefore, the optical center of the central area 3 is set 0.5mm to 5.0mm below the geometric optical center 21 of the spectacle lens. Preferably, the optical center of the central area 3 is set 2.0mm to 4.0mm below the geometric optical center 21 of the spectacle lens. The central area 3 can be circular, elliptical or hexagonal depending on the shape of the quadrant area. The diameter or maximum diameter length of the central area 3 is 7.0mm to 13.0mm.

[0068] Furthermore, the refractive power of the central zone 3 of the posterior lens 2 is 0.00D to -10.00D. The refractive power of the central zone 3 is set to 0.00D, which is suitable for those with low hyperopic reserve, so as to facilitate early myopia intervention. The refractive power of the central zone can also be adjusted according to the astigmatism of the lens wearer, with a maximum corrected astigmatism of <4.00DS.

[0069] Furthermore, the peripheral areas 4 of the front lens 1 and rear lens 2 of the spectacle lens are provided with four quadrants: the nasal quadrant, the temporal quadrant, the upper quadrant, and the lower quadrant. The defocus in the local area of ​​myopia mainly involves the nasal quadrant and the temporal quadrant, and the accommodation convergence involves the lower quadrant. Therefore, the peripheral area of ​​the spectacle lens is provided with at least three quadrants: the nasal quadrant, the temporal quadrant, and the lower quadrant. The three quadrants are provided with different refractive powers. The front lens 1 is molded into a refractive convex lens or a microlens convex lens by injection molding, and the rear lens 2 is CNC machined into a refractive convex lens.

[0070] Furthermore, the four quadrants above and below the nose and temple of the rear mirror 2, namely the nasal quadrant, temporal quadrant, upper quadrant, and lower quadrant, have a diameter of 15mm to 35mm, preferably 20mm to 30mm. To achieve a sufficiently wide field of vision for near vision, the diameter of the lower quadrant is 2.0mm to 6.0mm larger than that of the upper quadrant, and the area of ​​the lower quadrant is 4.0mm larger than that of the upper quadrant. 2 Up to 16mm 2The vertical diameter of the lower quadrant is 2.0 mm to 6.0 mm longer than that of the upper quadrant, and the horizontal diameter of the lower quadrant is 2.0 mm to 6.0 mm longer than that of the upper quadrant. The diameter of the nasal quadrant, temporal quadrant, upper quadrant, and lower quadrant of the posterior mirror 2 is set as a gradient zone 10 with a diameter of 2.0 mm to 6.0 mm.

[0071] Furthermore, in order to ensure the correction of nasotemporal peripheral anisometropia, the positive additive value of the refractive power of the nasal quadrant and temporal quadrant of the anterior mirror 1 and posterior mirror 2 relative to the central area 3 is +0.50D to +5.00D, and the refractive power of the nasal quadrant is +0.25D to +3.50D greater than that of the temporal quadrant.

[0072] Furthermore, the bifocal prism uses convex lenses with a refractive power of +0.75D to +2.50D and prism power of 1.0△ to 4.0△. Preferably, the lens power is: +2.00D in the lower quadrant corresponds to 3.0△, +1.50D in the lower quadrant corresponds to 2.0△, +1.00D in the lower quadrant corresponds to 1.5△, and +0.75D in the lower quadrant corresponds to 1.0△. The +0.75D in the lower quadrant corresponds to 1.0△, which is used for myopia prevention and intervention.

[0073] Furthermore, the lower quadrant of the spectacle lens is provided with one, two, or three horizontal or vertical radial prisms. The prism base faces the nose, with a diameter of 10mm to 40mm, a diameter of 3mm to 20mm, a base thickness of 0.1mm to 4.0mm, and a prism power of 1.0△ to 4.0△. The prism power of the prism closer to the nose is 0.25△ to 0.50△ greater than that of the prism on the temporal side, and the prism power of the prism closer to the lower side is 0.25△ to 0.50△ greater than that of the prism on the upper side. The purpose of providing two or three prisms is to achieve the effect of near vision being equal to distance vision when the eye is focused at different azimuth angles.

[0074] Furthermore, the spectacle lens includes at least a central zone for correcting central myopic defocus and improving distance vision, a lower quadrant for balancing eye accommodation and convergence, and a nasal quadrant and a temporal quadrant for correcting peripheral hyperopic anisometropia of the retina.

[0075] Furthermore, the spectacle lens of the present invention can be fabricated with the following refractive surface type:

[0076] A bi-beam prism and a refractive convex lens for the nasotemporal quadrant are positioned on the rear mirror surface;

[0077] The bi-beam prism is positioned in the lower quadrant of the front mirror, and the refractive convex lens in the nasotemporal quadrant is positioned in the rear mirror.

[0078] The bi-beam prism and the nasotemporal quadrant refractive convex lens are set on the rear mirror surface, and the nasotemporal quadrant microlens convex lens is set on the front mirror surface.

[0079] A bi-prism and a microlens-type convex lens for the nasotemporal quadrant are positioned on the front mirror surface.

[0080] Furthermore, the refractive power of the front lens 1 and the rear lens 2 of the spectacle lens is:

[0081] The nasal quadrant is +0.75D to +5.00D, the temporal quadrant is +0.50D to +4.75D, the upper quadrant is +0.00D to +4.50D, and the lower quadrant is +1.50D to +2.50D. At least the nasal quadrant is greater than the temporal quadrant by +0.50D to +2.50D. A lower quadrant of +2.00D corresponds to a prism power of 3.0△, a lower quadrant of +1.50D corresponds to a prism power of 2.0△, and a lower quadrant of +1.00D corresponds to a prism power of 1.5△.

[0082] Furthermore, the spectacle lens is mounted on a single-layer spectacle frame, an additional spectacle frame of a double-layer spectacle frame, or a modular spectacle frame. The myopia concave lens and peripheral defocus lens are mounted on the main frame of a double-layer spectacle frame, or on another spectacle frame of a modular spectacle frame.

[0083] Example 1 of the spectacle lens of the present invention

[0084] The spectacle lens is manufactured using a CNC lathe. The refractive power of the central area of ​​the rear lens 2 is 0.00D, the added power in the nasal quadrant is +1.25D, the added power in the temporal quadrant is +0.75D, and the added power in the lower quadrant is +1.50D. The composite base facing the nasal side has a prism power of 2.0△.

[0085] Example 2 of the spectacle lens of the present invention

[0086] In Example 2, the front lens 1 of the spectacle lens is made from a molded blank. The central area of ​​the front lens 1 is a plano lens. A microlens with an added power of +3.00D is set in the nasal quadrant and a microlens with an added power of +2.00D is set in the temporal quadrant. A blank with a prism power of 3.0△ and a base facing the nasal side is set in the lower quadrant. The blank is then formed into a rear lens using a CNC machine. The refractive power of the rear lens is -4.25D in the central area, +2.00D in the lower quadrant, +1.75D in the nasal quadrant, and +1.50D in the temporal quadrant.

[0087] The lower quadrant of the spectacle lens described in this invention is a bifocal prism, which compensates for the accommodative and convergent imbalance caused by peripheral defocus lenses when used for near vision, thus relaxing convergence and simulating distance vision for near vision. The nasotemporal quadrant of the spectacle lens has asymmetrical refractive power, correcting anisometropia caused by hyperopia in the peripheral nasotemporal region of the retina.

[0088] This invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its concept and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims.

Claims

1. A bi-prism lens with peripheral defocus in a localized area, characterized in that, The spectacle lens is a combination of a bifocal prism and a lens for correcting peripheral defocus on the nasotemporal retina. The front and rear surfaces of the lens are divided into central and peripheral zones. The central zone of the rear surface contains a concave lens, while the nasal, temporal, and upper quadrant zones of the peripheral zone contain refractive convex lenses. The central zone of the front surface is a plano lens, while the nasal, temporal, and upper quadrant zones of the peripheral zone contain spherical microlenses. A refractive convex lens-prism combination is placed in the lower quadrant of one side of the lens, or a refractive convex lens and a prism are respectively placed on the front and rear surfaces. The design parameters of the spectacle lens satisfy the following: The optical center of the central area of ​​the rear lens is located 0.5 mm to 5.0 mm below the geometric center of the lens; The refractive power of the combination of the anterior and posterior mirror surfaces in the nasal quadrant is greater than that of the combination of the anterior and posterior mirror surfaces in the temporal quadrant by +0.50D to +3.00D. The length of the vertical diameter in the lower quadrant of the rear mirror is 0.5 mm to 6.0 mm longer than the length of the vertical diameter in the upper quadrant of the rear mirror, and the length of the horizontal diameter in the lower quadrant of the rear mirror is 0.5 mm to 6.0 mm longer than the length of the horizontal diameter in the upper quadrant of the rear mirror. The area of ​​the lower quadrant of the rear mirror is 4.0 mm larger than the area of ​​the upper quadrant of the rear mirror. 2 Up to 20.0mm 2 The lower quadrant of the rear mirror is equipped with a convex lens with a positive additive refractive power of +0.75D to +2.50D relative to the central zone, and the lower quadrant is equipped with a prism with a power of 1.0△ to 4.0△; the prism base faces the nasal side, with a diameter of 10mm to 50mm, a diameter of 3mm to 20mm, and a base thickness of 0.1mm to 4.0mm; Two prisms are arranged horizontally and radially in the lower quadrant of the posterior or anterior mirror, with the prism power of the prism closer to the nose being 0.25△ to 0.50△ greater than that of the prism on the temporal side. The technical parameters for the combined refractive power of the anterior and posterior lenses are as follows: +0.75D to +5.00D in the nasal quadrant, +0.50D to +4.75D in the temporal quadrant, +0.00D to +4.50D in the upper quadrant, and +1.50D to +2.50D in the lower quadrant. A convex lens power of +2.00D in the lower quadrant corresponds to a prism power of 3.0△, and a convex lens power of +1.50D in the lower quadrant corresponds to a prism power of 2.0△.

2. The spectacle lens according to claim 1, characterized in that, The diameter of the central area of ​​the posterior mirror is 5.0 mm to 13.0 mm, and the refractive power is 0.00 D to -10.00 D. The diameters of the nasal quadrant, temporal quadrant, upper quadrant, and lower quadrant of the posterior mirror are 15 mm to 35 mm, and a gradient zone of 1.0 mm to 6.0 mm is provided. The diameter of the lower quadrant of the posterior mirror is 2.0 mm to 6.0 mm larger than the diameter of the upper quadrant.

3. The spectacle lens according to claim 1, characterized in that, The lower quadrant prism has a diameter of 15mm to 35mm, a diameter of 4mm to 15mm, and a base thickness of 0.25mm to 1.5mm.

4. The spectacle lens according to claim 1, characterized in that, The lenses are mounted on single-layer eyeglass frames, additional eyeglass frames for double-layer eyeglass frames, or modular eyeglass frames.

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