Individualized diffractive slope annular peripheral defocus spectacle lens

Abstract

The individualized diffractive hill-ring type peripheral defocus spectacle lens belongs to the technical field of spectacle. In the present invention, the front and rear lens surfaces are respectively provided with a central area and a peripheral area. The central areas of the front and rear lens surfaces are refractive lenses with a refractive power of 0.00D to -10.00D. The peripheral area of the front lens surface consists of multiple diffractive hill-ring arrays with a base positive addition value of +0.50D to +4.00D in refractive power. The peripheral area of the rear lens surface is a refractive lens with a refractive power that is an additional positive addition value of +0.50D to +3.00D based on the concave lens degree in the central area. The total positive addition value of the front and rear lens surfaces is +1.00D to +7.00D. The difference in positive addition value of the rear lens surface or the gradient difference of the total positive addition value of the front and rear lens surfaces is ±0.01 to 0.25D. At least 5 positive addition value sections and 5 positive addition value sub-levels are respectively provided in the peripheral areas of the front and rear lens surfaces. The total refractive power of the peripheral areas of the front and rear lens surfaces is 360° equal refractive power, or the refractive power of the nasal side peripheral area > the refractive power of the temporal side peripheral area by +0.50D to +2.00D.

Description

Technical Field

[0001] The present invention belongs to the technical field of glasses. Specifically, it provides an individualized diffractive slope ring type peripheral defocus spectacle lens with an arbitrarily set total front and rear lens positive addition value. Background Art

[0002] It is currently medically recognized that the growth of the eyeballs of children and adolescents with myopia depends on the regulation of peripheral defocus of the retina. Hyperopic peripheral defocus of the retina promotes eyeball growth. Correcting hyperopic peripheral defocus of the retina can control the growth of myopic eyeballs.

[0003] The diffractive slope ring has the advantage of multiple foci and has been applied to the design of trifocal intraocular lenses.

[0004] For the "diffractive slope ring type peripheral defocus spectacle lens" applied by the inventor of the present invention, the application date is January 28, 2021. It is a patent application with two requests for one case. The publication number of the invention patent application is: CN112649971A, and the application number of the utility model is: 2021203007154. The disclosure of this patent is that the peripheral area of the front lens is a diffractive slope ring and the rear lens is a single-vision concave lens surface. The defocus amount of this kind of spectacle lens depends on the positive addition value or defocus amount of the diffractive slope ring on the front lens. It is impossible to mold different defocus amount spectacle lenses according to the individual defocus amount.

[0005] Refractive peripheral defocus spectacle lenses are processed by numerically controlled lathes. They are highly precise and the refractive power can reach 0.01D. The refractive type spectacle lenses must be provided with a gradual change area to gradually and smoothly transition the refractive power between the central area and the treatment area. A positive addition value greater than +2.00D will generate a large amount of astigmatism.

[0006] There is a need to develop new surface type innovative designs for peripheral defocus spectacle lenses. The peripheral defocus spectacle lenses for myopia are still one of the technical problems in the field of glasses. Summary of the Invention

[0007] The object of the present invention is to provide an individualized diffractive slope ring type peripheral defocus spectacle lens.

[0008] The object of the present invention is achieved by the following technical solutions:

[0009] The personalized diffractive slope-ring type peripheral defocus spectacle lens is a frame spectacle lens, hereinafter referred to as this spectacle lens. The front and rear surfaces of this spectacle lens are respectively provided with two optical regions, namely a central region and a peripheral region. The central regions of the front and rear surfaces are refractive lenses, and according to the myopia degree of individual spectacle wearers, the refractive power is set to 0.00D to -10.00D. The peripheral region of the front surface consists of multiple diffractive slope-ring arrays, and the refractive power is set to a base positive addition value of +0.50D to +4.00D. The peripheral region of the rear surface is a refractive lens. According to the peripheral defocus correction amount of individual spectacle wearers, the refractive power is an additional positive addition value of +0.50D to +3.00D on the basis of the concave lens degree in the central region. The base positive addition value of the front surface + the differential positive addition value of the rear surface = the total positive addition value of the front and rear surfaces +1.00D to +7.00D, and the differential positive addition value of the rear surface or the gradient difference of the total positive addition value of the front and rear surfaces is ±0.01 to 0.25D. At least 5 positive addition value sections and at least 5 positive addition value sub-levels are respectively set in the peripheral regions of the front and rear surfaces. The total refractive power of the peripheral regions of the front and rear surfaces is set to 360° equal refractive power, or the refractive power of the nasal side peripheral region > the refractive power of the temporal side peripheral region +0.50D to +2.00D.

[0010] The width of the diffractive slope-ring is 5nm to 2mm, the height is 0.1nm to 16μm, the steep side faces the optical center, and the gentle side is away from the optical center. The included angle of the diffractive slope-ring is <5°. According to the different widths of the diffractive slope-ring at the mm level, μm level, and nm level in the peripheral region, at least 6 to 120 concentric-axis diffractive slope-ring arrays are set. The connection between two adjacent diffractive slope-rings is either gapless or the spacing is 0.5nm to 0.25mm. The same diffractive slope-ring is set to have the same circumferential azimuth angle, the same width, the same height, and the same refractive power. The cross-sections of multiple diffractive slope-rings are serrated and convex-concave connected to each other.

[0011] The central area of the front mirror surface is set to a perfect circle, horizontal ellipse, vertical ellipse, or an up-and-down window shape with the optical center as the optical axis according to the shape of the peripheral area. The horizontal diameter of the central area is 8 mm to 14 mm, and the vertical diameter is equal to the diameter of the spectacle lens. The diffraction slope ring array in the peripheral area of the front mirror surface is divided into: a full ring means within the 360° circumferential azimuth of the peripheral area; a half ring means within the 180° circumferential azimuth occupied by the nasal peripheral area and the temporal peripheral area respectively; a fan ring means within the inner arc <180° circumferential azimuth and the outer arc ≤180° circumferential azimuth occupied by the nasal peripheral area and the temporal peripheral area respectively, or the diffraction slope rings are respectively arrayed in the nasal peripheral area and the temporal peripheral area, forming a nasal-temporal perfect circle, horizontal ellipse, vertical ellipse, or arc-top shape. The central area of the rear mirror surface is set to a perfect circle, horizontal ellipse, vertical ellipse according to the shape of the peripheral area, or the nasal peripheral area and the temporal peripheral area are respectively set to a perfect circle, horizontal ellipse, vertical ellipse. The front and rear mirror surfaces select the same-shaped central area and peripheral area, or the front mirror surface selects any shape, and the rear mirror surface selects a central area that is a perfect circle, horizontal ellipse, vertical ellipse, or selects the nasal peripheral area and the temporal peripheral area to be any one of a perfect circle, ellipse, vertical ellipse.

[0012] A compound base is set in the lower side area of the central area of the front mirror surface or the rear mirror surface, and a prism lens with a prism diopter of 0.5Δ to 6.0Δ is directed towards the nose side.

[0013] The peripheral area of the front mirror surface is set to 4 different refractive power diffraction slope ring quadrants: the upper quadrant area, the lower quadrant area, the nasal quadrant area, and the temporal quadrant area, each quadrant area occupying within 90° of the circumferential azimuth, or the nasal quadrant area and the temporal quadrant area are set to diffraction slope ring quadrants, and the upper quadrant area and the lower quadrant area are set to refraction quadrants. The refractive power of the diffraction slope ring in the nasal quadrant area > the refractive power of the diffraction slope ring in the temporal quadrant area, and the refractive power of the refraction in the lower quadrant area > the refractive power of the refraction in the upper quadrant area.

[0014] The peripheral areas of the front and rear mirror surfaces are bilateral mirror surfaces with a double positive addition value. The positive addition value refers to the additional defocus amount. The additional positive addition value in the peripheral area of the front mirror surface refers to the refractive power of the diffraction slope ring, and the additional positive addition value in the peripheral area of the rear mirror surface refers to the additional positive addition value of the individual wearer's difference on the basis of the base positive addition value. The base positive addition value is 90% to 10% of the total positive addition value, and the differential positive addition value is 10% to 90% of the total positive addition value. The refractive power of the peripheral area of the front mirror surface = the base positive addition value, the refractive power of the peripheral area of the rear mirror surface = the refractive power of the concave lens in the central areas of the front and rear mirror surfaces + the differential positive addition value. The total refractive power of the peripheral areas of the front and rear mirror surfaces ≡ the refractive power of the peripheral area of the front mirror surface + the refractive power of the peripheral area of the rear mirror surface. The differential positive addition value or the gradient difference of the total positive addition value is ±0.05D to ±0.15D, the included angle of the diffraction slope ring < 2°, and there is no prism diopter in the diffraction slope ring area.

[0015] In the peripheral region of the front lens surface, each diffraction slope ring gradually reduces the width and height of the diffraction slope ring from the center to the periphery, and increases the number of slope rings, thereby gradually increasing the positive addition value in the diffraction slope ring region. The refractive power between adjacent two diffraction slope rings is set to be progressive. In the peripheral region of the rear lens surface, the refractive lens gradually increases the refractive power starting from the edge of the central region, or forms a sectional gradient region.

[0016] Five positive addition value sections are respectively set in the peripheral regions of the front and rear lens surfaces: full annular or nasal side peripheral region positive addition value. From the edge of the central region to 10 mm to 11.9 mm away from the optical center, the total positive addition value is 20%; from 12 mm to 13.9 mm away from the optical center, the section is 40% of the total positive addition value; from 14 mm to 15.9 mm away from the optical center, the section is 60% of the total positive addition value; from 16 mm to 17.9 mm away from the optical center, the section is 80% of the total positive addition value; from 18 mm to 30 mm away from the optical center, the section is 100% of the total positive addition value. From 30 mm away from the optical center to the edge of the spectacle lens, it is a plano lens or has the same refractive power as the central region, or the distance from the optical center is reduced to 0.5 mm to 1.0 mm to set different sections. Five base quantity positive addition value sub - levels are set in the peripheral region of the front lens surface: the full annular or nasal side peripheral region positive addition values are respectively +1.00D, +1.50D, +2.00D, +2.75D, +3.50D. The temporal side peripheral region < the nasal side peripheral region positive addition value +0.50D to +1.50D. The differential positive addition value in the peripheral region of the front lens surface is supplemented to the total positive addition value of the front and rear lens surfaces.

[0017] For the differential positive addition value, according to the onset age of myopia being earlier than 10 years old, the annual increase in myopia degree > -0.75D, the annual increase in axial length or peripheral refraction of the retina, children with both parents being highly myopic, and the daily close - up eye - using time > 10 hours, it is calculated by adding +0.10D to +0.50D individually for each inducing factor. For the full annular lens in the peripheral region, +0.50D to +2.50D is added, and the refractive power of the nasal side peripheral region > the temporal side peripheral region by +0.25D to +1.00D.

[0018] The spectacle lens is manufactured as follows: The optical surface shapes of the central region and the peripheral region of the front lens surface are formed by molding. The base quantity positive addition value in the peripheral region of the front lens surface is at least set to 70% to 90% of the total positive addition value to form a pre - formed blank for the refractive surface shape of the front lens surface. The pre - formed blank is formed into the refractive surface shapes of the central region and the peripheral region of the rear lens surface through the spectacle lens workshop. The accuracy of the refractive power formed in the workshop is ±0.01D. The refractive power of the peripheral region of the rear lens surface is the total refractive power of the front and rear lens surfaces minus the base quantity positive addition value. The refractive power gradient difference of the formed peripheral region of the rear lens surface is +0.05 to +0.15D. After forming, the central regions of the front and rear lens surfaces and the optical centers of the peripheral regions correspond to each other, and the optical surface shapes of the front and rear lens surfaces correspond at least in a 90° azimuth angle range. The optical centers of the nasal - temporal peripheral regions of the front and rear lens surfaces are located on the same horizontal diameter of the optical center.

[0019] The beneficial effects of the present invention compared with the prior art are as follows:

[0020] 1. The applicant's previous patent application was titled: Diffractive Slope Ring Peripheral Defocus Eyeglass Lenses. The central area of the front surface of this type of eyeglass lens is a refractive lens, and the peripheral area is a diffractive slope ring lens. The refractive power of the diffractive slope ring micro-lens is a total positive addition value. The back surface is a single-vision concave lens for correcting myopia. This type of eyeglass lens cannot achieve individualized customization for the diffractive lens, and it is even more impossible to achieve a positive addition value gradient difference in the range of +0.01D to +0.25D.

[0021] 2. The front and back surfaces of the eyeglass lens of the present invention are respectively provided with two optical regions, namely the central area and the peripheral area. The peripheral area of the front surface consists of multiple diffractive slope ring arrays, and the refractive power is set as a base positive addition value of +0.50D to +4.00D. The peripheral area of the back surface is a refractive lens. According to the peripheral defocus correction amount of the individual wearer, the refractive power is an additional differential positive addition value of +0.50D to +3.00D based on the concave lens degree in the central area. The total positive addition value of the front and back surfaces is +1.00D to +7.00D, and the differential positive addition value of the back surface or the gradient difference of the total positive addition value of the front and back surfaces is ±0.01 to 0.25D, realizing individualized positive addition values in the peripheral area, and the positive addition value can be arbitrarily customized and selected within the range of +1.00D to +7.00D.

[0022] 3. Compared with the cylindrical micro-lens, the individual independent diffractive slope ring lens has a larger optical area, and has multiple optical refractive powers relative to the single-vision refractive lens, without the ripple quadrants generated by the cylindrical micro-lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a front view of the structure of a circular eyeglass lens in the nasal-temporal peripheral area of the front and back surfaces;

[0024] Figure 2 It is a schematic diagram of the structure of a circular diffractive slope ring in the nasal-temporal peripheral area of the front surface and its enlargement;

[0025] Figure 3 It is a front view of the structure of a circular refractive lens in the nasal-temporal peripheral area of the back surface;

[0026] Figure 4 It is a front view of the structure of a circular diffractive slope ring with the optical center of the front surface as the axis;

[0027] Figure 5 It is a front view of the structure of a horizontally elliptical diffractive slope ring with the optical center of the front surface as the axis;

[0028] Figure 6 It is a front view of the structure of a vertically elliptical diffractive slope ring with the optical center of the front surface as the axis;

[0029] Figure 7 It is a front view of the structure of a semi-circular diffractive slope ring with the optical center of the front surface as the axis;

[0030] Figure 8 It is a front view of the structure of a fan-shaped annular diffractive slope ring with the optical center of the front mirror as the axis;

[0031] Figure 9 It is a front view of the structure of an arc-top diffractive slope ring with the optical center of the front mirror as the axis;

[0032] Figure 10 It is a front view of the structure of a horizontally elliptical diffractive slope ring in the nasal-temporal peripheral area of the front mirror;

[0033] Figure 11 It is a front view of the structure of a vertically elliptical diffractive slope ring in the nasal-temporal peripheral area of the front mirror;

[0034] Figure 12 It is a front view of the structure of a circular refractive lens with the optical center of the rear mirror as the axis;

[0035] Figure 13 It is a front view of the structure of a horizontally elliptical refractive lens with the optical center of the rear mirror as the axis;

[0036] Figure 14 It is a front view of the structure of a vertically elliptical refractive lens with the optical center of the rear mirror as the axis;

[0037] Figure 15 It is a front view of the structure of a horizontally elliptical refractive lens in the nasal-temporal peripheral area of the rear mirror;

[0038] Figure 16 It is a front view of the structure of a vertically elliptical refractive lens in the nasal-temporal peripheral area of the rear mirror;

[0039] Figure 17 It is a front view of the structure of the front mirror with four quadrant areas;

[0040] Figure 18 It is a schematic diagram of the structure of a partially enlarged microscope of the diffractive slope ring.

[0041] In the figure: 1 front mirror; 2 rear mirror; 3 central area; 4 peripheral area; 5 gradient area; 6 base positive addition value; 7 differential positive addition value; 8 total positive addition value; 9 diffractive slope ring; 10 height of the diffractive slope ring; 11 width of the diffractive slope ring; 12 included angle of the diffractive slope ring; 13 refractive lens; 14 concave lens; 15 convex lens; 16 triangular prism; 17 plano lens; 18 full ring; 19 half ring; 20 fan-shaped ring; 21 circular; 22 horizontally elliptical; 23 vertically elliptical; 24 arc-top shape; 25 dividing line.

[0042] Symbolic Abbreviations: HM: (Horizontal Meridian) Horizontal Meridian; VM: (Vertical Meridian) Vertical Meridian; NS (Nasal Side) Nasal Side; TS (Temporal Side) Temporal Side; SS (Superior Side) Superior Side; LS (LowerSide) Lower Side. Detailed Implementation Manner

[0043] Through the following specific implementation manners, the present invention provides an individualized diffractive slope-ring type peripheral defocus spectacle lens:

[0044] Meanings of terms in the invention specification:

[0045] Refractive eyeglasses: Refraction refers to spherical and aspherical spectacle lenses in which light converges to a focus after passing through the lens, and it is the most common type of spectacle lens. Refractive eyeglasses are formed by molding or lathe turning. Concentric-axis eyeglasses such as full-ring, regular circular, vertical oval, and horizontal oval are preferably formed by lathe turning.

[0046] Diffractive eyeglasses: Diffraction refers to the phenomenon that light waves continue to propagate around obstacles, also known as diffraction. The surface of the diffractive stepped optical element is formed by precision molding at the millimeter, micron, and nanometer levels. By changing the width, height, and number of diffractive slope rings, extremely low chromatic aberration can be achieved, the positive addition value can be adjusted, the focusing imaging position can be adjusted, and the imaging effect is extremely clear.

[0047] The following further describes the present invention in detail in conjunction with the drawings and specific implementation manners:

[0048] The individualized diffractive slope-ring type peripheral defocus spectacle lens is hereinafter referred to as this kind of spectacle lens.

[0049] Figure 1 Schematic: The front mirror surface 1 and the rear mirror surface 2 are respectively set as the central area 3 and the peripheral area 4. The central area 3 is a concave lens sheet 14 with upper and lower openings in the central area of the spectacle lens. The peripheral area 4 is located in the nasal side NS and temporal side TS areas of the spectacle lens and is set as a regular circular 21 convex lens sheet 15. The convex lens sheet in the peripheral area 4 of the front mirror surface 1 forms a base positive addition value 6, and the peripheral area 4 of the rear mirror surface 2 forms a differential positive addition value 7. The total positive addition value 8 is formed around the front and rear mirror surfaces, forming a front view of the structure of the regular circular spectacle lens in the nasal-temporal peripheral areas of the front and rear mirror surfaces, as Figure 1 .

[0050] Figure 2Schematic diagram: the front mirror surface 1 is set to a central area 3 and a peripheral area 4, the central area 3 is located in the upper and lower window type in the central area of ​​the eyeglass lens, and is set to a concave lens piece 14, the peripheral area 4 is located in the nasal and temporal areas of the eyeglass lens, and is set to a perfect circular convex lens piece 15, the peripheral area 4 of the front mirror surface 1 is a diffraction slope ring 9, the convex lens piece 15 forms a base amount positive addition value 6, a microscopic enlargement of the diffraction slope ring 9 of the front mirror surface 1, a diffraction slope ring height 10 and a diffraction slope ring width 11. A perfect circular diffraction slope ring and an enlarged structural schematic diagram of the nasal and temporal peripheral area of ​​the front mirror surface are formed, as shown in FIG. Figure 2 .

[0051] Figure 3 Schematic diagram: the rear mirror surface 2 is respectively configured as a central area 3 and a peripheral area 4, the central area 3 is located in the upper and lower window type in the central area of ​​the eyeglass lens, and is configured as a concave lens piece 14, the peripheral area 4 is located in the nasal and temporal areas of the eyeglass lens, and is configured as a perfect circular convex lens piece 15, the peripheral area 4 of the rear mirror surface 2 forms a differential positive addition value 7, and the differential positive addition value 7 of the peripheral area 4 of the rear mirror surface is combined with the refractive power of the concave lens piece in the central area of ​​the rear mirror surface to form the refractive power of the peripheral area, forming a structural emmetropia of a perfect circular refractive lens in the nasal and temporal peripheral area of ​​the rear mirror surface Figure 3 ,like Figure 3 .

[0052] Figure 4 Schematic diagram: the front mirror surface 1 is a full ring 18, the central area 3 is a concave lens sheet 14, the peripheral area 4 is a convex lens sheet 15, and the diffraction slope ring 9 forms a base amount positive addition value 6, forming a structural front view of a true circular diffraction slope ring with the optical center of the front mirror surface as the axis, as shown in FIG. Figure 4 .

[0053] Figure 5 Schematic diagram: the front mirror surface 1 is a full ring, the central area 3 is a flat lens 17, and the peripheral area 4 diffraction slope ring 9 forms a base amount positive addition 6, forming a structural front view of a diffraction slope ring with the optical center of the front mirror surface as the axis horizontal right circular shape, as shown in FIG. Figure 5 .

[0054] Figure 6 Schematic diagram: the front mirror surface 1 has a full-ring central area 3 and a peripheral area 4, and the diffraction slope ring 9 forms a base quantity positive addition value 6, forming a structural front view of a vertical circular diffraction slope ring with the optical center of the front mirror surface as the axis, as shown in Figure 6 .

[0055] Figure 7 Schematic diagram: the front mirror surface 1 is set as a semi-circular 19 by the dividing line 25, the peripheral area 4 occupies an azimuth angle of 180° on the nasal and temporal sides, the central area 3 is a concave lens sheet 14, and the peripheral area 4 is a convex lens sheet 15 with a base amount positive addition value 6 formed by a diffraction slope ring 9, forming a front view of the structure of a semi-circular diffraction slope ring with the optical center of the front mirror as the axis, as shown in Figure 7 .

[0056] Figure 8Schematic diagram: the front mirror surface 1 is composed of a central area 3 and a peripheral area 4. The peripheral area 4 on the nasotemporal side is a fan ring 20. The peripheral area 4 is a diffraction slope ring 9 forming a base amount positive addition value 6, forming a front view of the structure in which the optical center of the front mirror surface is an axial fan ring diffraction slope ring, as shown in FIG. Figure 8 .

[0057] Figure 9 Schematic diagram: the front mirror surface 1 is composed of a central area 3 and a peripheral area 4. The peripheral area 4 on the nasotemporal side is an arc top shape 24, and the peripheral area 4 is a diffraction slope ring 9, forming a front view of the structure in which the optical center of the front mirror surface is an axial arc top-shaped diffraction slope ring, as shown in FIG. Figure 9 .

[0058] Figure 10 Schematic diagram: the front mirror surface 1 is configured as a central area 3 and a peripheral area 4, the central area 3 is located in the upper and lower window-type in the central area of ​​the eyeglass lens, and is configured as a concave lens sheet 14, the peripheral area 4 is located in the nasal and temporal areas of the eyeglass lens, and is configured as a transverse elliptical convex lens sheet 15, the peripheral area 4 of the front mirror surface 1 is a diffraction slope ring 9, the convex lens sheet 15 forms a base amount positive addition 6, and the lower area of ​​the central area 3 is configured with a base facing the nasal side prism sheet 16, forming a structural front view of a transverse elliptical diffraction slope ring in the nasal and temporal peripheral area of ​​the front mirror surface, as shown in FIG. Figure 10 .

[0059] Figure 11 Schematic diagram: the front mirror surface 1 is configured as a central area 3 and a peripheral area 4, the central area 3 is located in the upper and lower window-type in the central area of ​​the eyeglass lens, and is configured as a concave lens sheet 14, the peripheral area 4 is located in the nasal side NS and the temporal side TS area of ​​the eyeglass lens, and is configured as a vertical elliptical 23 convex lens sheet 15, the peripheral area 4 of the front mirror surface 1 is a diffraction slope ring 9, and the convex lens sheet 15 forms a base amount positive addition value 6, forming a structural front view of a vertical elliptical diffraction slope ring in the nasal temporal peripheral area of ​​the front mirror surface, as shown in FIG. Figure 11 .

[0060] Figure 12 Schematic diagram: the central area 3 of the full ring of the rear mirror surface 2 is a concave lens sheet 14, and a gradient area 5 is set between the peripheral area 4 and the central area 3. The peripheral area 4 is a convex lens sheet 15 to form a differential positive addition value 7, forming a structural front view of a true circular refractive lens with the optical center of the rear mirror surface as the axis, as shown in FIG. Figure 12 .

[0061] Figure 13 Schematic diagram: the central area 3 and the peripheral area 4 of the rear mirror surface 2, the peripheral area 4 is a refractive lens 13 to form a differential positive value 7, forming a structure of a refractive lens with the rear mirror surface optical center as the axis horizontal elliptical Figure 13 ,like Figure 13 .

[0062] Figure 14Schematic: The central area 3 and the peripheral area 4 of the rear mirror surface 2. The peripheral area 4 forms a differential positive addition value 7 for the refractive lens 13, forming a front view of the structure of a refractive lens with an axis vertical elliptical shape as the optical center of the rear mirror surface, as Figure 14 。

[0063] Figure 15 Schematic: The central area 3 and the peripheral area 4 of the rear mirror surface 2. The peripheral area 4 forms a differential positive addition value 7 for the refractive lens 13, forming a front view of the structure of a refractive lens with an axis vertical elliptical shape as the optical center of the rear mirror surface, as Figure 15 。

[0064] Figure 16 Schematic: The central area 3 and the peripheral area 4 of the rear mirror surface 2. The peripheral area 4 forms a differential positive addition value 7 for the refractive lens 13, forming a front view of the structure of a refractive lens with an axis vertical elliptical shape as the optical center of the rear mirror surface, as Figure 16 。

[0065] Figure 17 Schematic: The front mirror surface is set as the upper quadrant area SS, the lower quadrant area LS, the nasal quadrant area NS, and the temporal quadrant area TS, forming a front view of the structure of the front mirror surface with four quadrant areas, as Figure 17 。

[0066] Figure 18 Schematic: It is the diffraction slope ring height 10, diffraction slope ring width 11, and diffraction slope ring included angle 12 of the diffraction slope ring 9 of the spectacle lens, forming a schematic diagram of the structure of the locally magnified microscope of the diffraction slope ring, as Figure 18 。

[0067] The individualized diffraction slope ring type peripheral defocus spectacle lens is a frame spectacle lens, hereinafter referred to as this kind of spectacle lens. The front and rear mirror surfaces of this kind of spectacle lens are respectively provided with two optical regions, namely the central area and the peripheral area. The central areas of the front and rear mirror surfaces are refractive lenses. According to the myopia degree of the individual wearer, the refractive power is set to 0.00D to -10.00D. If the wearer has cylindrical astigmatism, the astigmatism degree needs to be compounded together. The peripheral area of the front mirror surface consists of multiple diffraction slope ring arrays, and the diffraction slope ring aspherical refractive power is set to a basic positive addition value of +0.50D to +4.00D. The peripheral area of the rear mirror surface is a refractive lens. According to the peripheral defocus correction amount of the individual wearer, the refractive power is an additional differential positive addition value of +0.50D to +3.00D based on the concave lens degree in the central area. The basic positive addition value of the front mirror surface + the differential positive addition value of the rear mirror surface = the total positive addition value of the front and rear mirror surfaces + 1.00D to +7.00D. The total positive addition value is adjusted according to the myopia degree and the peripheral refractive state of the retina.

[0068] The posterior mirror differential positive addition value or the gradient difference of the total positive addition value between the front and rear mirrors is ±0.01 to 0.25 D. Since the posterior mirror is a refractive lens, the numerical control lathe can accurately control it within 0.01 D, thus realizing customized individual differences. At least 5 positive addition value sections are respectively set in the peripheral areas of the front and rear mirrors. The purpose of different sections is to adapt to different defocus degrees corresponding to different curvatures of the retina. At least 5 positive addition value sub-levels are respectively set. The purpose of setting different positive addition value sub-levels is to apply different defocus corrections for different myopia degrees. The total refractive power of the peripheral areas of the front and rear mirrors is set to be an equal refractive power of 360°. The purpose is to design a full-ring defocus spectacle lens. The refractive power of the nasal peripheral area > the refractive power of the temporal peripheral area + 0.50 D to + 2.00 D. The purpose is to design a nasal-temporal peripheral defocus spectacle lens.

[0069] The width of the diffraction slope ring is 5 nm to 2 mm, the height is 0.1 nm to 16 μm, the steep side faces the optical center, and the gentle side is away from the optical center. The included angle of the diffraction slope ring < 5°. According to the different widths of the diffraction slope ring at the mm level, μm level, and nm level in the peripheral area, the purpose is to achieve different surface shapes of the spectacle lens design. According to the different widths of the diffraction slope ring, an array of 6 to 120 concentric-axis diffraction slope rings is set. If the diffraction slope ring is designed at the nanometer level, the number of concentric-axis design rings will be more than 120. The connection between adjacent two diffraction slope rings is gapless or the spacing is 0.5 nm to 0.25 mm. The gapless connection is preferably selected. The same diffraction slope ring is set to have the same circumferential azimuth angle, the same width, the same height, and the same refractive power. The cross-sections of multiple diffraction slope rings are serrated and convex-concave connected to each other.

[0070] The central area of the front mirror is set to be a perfect circle, a horizontal ellipse, a vertical ellipse, or a windowed shape upwards and downwards with the optical center as the optical axis according to the shape of the peripheral area. The diameter of the perfect circle is 8 mm to 14 mm, and the horizontal diameter of the windowed shape upwards and downwards is 8 mm to 14 mm. The vertical diameter is equal to the diameter of the spectacle lens. The diffraction slope ring array in the peripheral area of the front mirror is divided into: the full ring means within the 360° circumferential azimuth angle of the peripheral area, the half ring means within the 180° circumferential azimuth angle occupied by each of the nasal peripheral area and the temporal peripheral area, and the fan ring means within the inner arc < 180° circumferential azimuth angle and the outer arc ≤ 180° circumferential azimuth angle occupied by each of the nasal peripheral area and the temporal peripheral area. Or the diffraction slope rings are respectively arrayed in the nasal peripheral area and the temporal peripheral area, respectively forming a nasal-temporal perfect circle, a horizontal ellipse, a vertical ellipse, and an arc top shape. The central area of the posterior mirror is set to be a perfect circle, a horizontal ellipse, or a vertical ellipse with the optical center as the optical axis according to the shape of the peripheral area, or the nasal peripheral area and the temporal peripheral area are respectively set to be a perfect circle, a horizontal ellipse, or a vertical ellipse. The front and rear mirrors select the same-shaped central area and peripheral area, or the front mirror selects any shape, and the posterior mirror selects the central area to be a perfect circle, a horizontal ellipse, or a vertical ellipse, or selects any one of the nasal peripheral area and the temporal peripheral area to be a perfect circle, an ellipse, or a vertical ellipse.

[0071] A compound base is provided in the lower region of the central area of the front mirror surface or the rear mirror surface, with a prism lens having a prism power of 0.5Δ to 6.0Δ towards the nasal side, or a base-down prism is provided.

[0072] The peripheral area of the front mirror surface is set as four different refractive power diffractive ramp ring quadrant areas, namely the upper quadrant area, the lower quadrant area, the nasal quadrant area, and the temporal quadrant area. Each quadrant area occupies within a 90° circumferential azimuth angle. Alternatively, the nasal quadrant area and the temporal quadrant area are set as diffractive ramp ring quadrant areas, and the upper quadrant area and the lower quadrant area are set as refractive quadrant areas. The refractive power of the diffractive ramp ring in the nasal quadrant area > the refractive power of the diffractive ramp ring in the temporal quadrant area, and the refractive power of the lower quadrant area > the refractive power of the upper quadrant area.

[0073] The peripheral areas of the front and rear mirror surfaces have a bilateral mirror double positive addition value. The positive addition value refers to the additional defocus amount. The additional positive addition value in the peripheral area of the front mirror surface refers to the refractive power of the diffractive ramp ring, and the additional positive addition value in the peripheral area of the rear mirror surface refers to the additional positive addition value of the individual wearer's difference on the basis of the base positive addition value. The base positive addition value is 90% to 10% of the total positive addition value, and the differential positive addition value is 10% to 90% of the total positive addition value. The purpose of the base positive addition value in the front mirror surface is to set most of the individual positive addition values on the front mirror surface of the spectacle lens, and the differential positive addition value in the rear mirror surface is to set a small part of the individual positive addition values on the rear mirror surface of the spectacle lens, aiming for accurate molded power.

[0074] The refractive power of the peripheral area of the front mirror surface = the base positive addition value, and the refractive power of the peripheral area of the rear mirror surface = the refractive power of the concave lens in the central areas of the front and rear mirror surfaces + the differential positive addition value. The refractive power of the peripheral area of the rear mirror surface is the refractive power of the concave lens for correcting myopia plus the positive addition value of the refractive lens.

[0075] The total refractive power of the peripheral areas of the front and rear mirror surfaces ≡ the refractive power of the peripheral area of the front mirror surface + the refractive power of the peripheral area of the rear mirror surface. The differential positive addition value or the gradient difference of the total positive addition value is ±0.05D to ±0.15D. The differential positive addition value in the rear mirror surface is also the gradient difference of the refractive lens, which can be accurate to 0.01D. The included angle of the diffractive ramp ring < 2°, and the height of the diffractive ramp ring is extremely low, almost without prism power.

[0076] For each diffractive ramp ring in the peripheral area of the front mirror surface, the width and height of the diffractive ramp ring gradually decrease from the center to the periphery, and the number of ramp rings increases, thereby gradually increasing the positive addition value in the diffractive ramp ring area. The refractive power of adjacent two diffractive ramp rings is set progressively. The refractive lens in the peripheral area of the rear mirror surface gradually increases in refractive power starting from the edge of the central area, or forms a sectional gradient area.

[0077] Five positive addition value sections are respectively set in the peripheral areas of the front and rear lenses: full circular or nasal peripheral positive addition value. From the edge of the central area to 10 mm to 11.9 mm away from the optical center, the total positive addition value is 20%; from 12 mm to 13.9 mm away from the optical center, the section is 40% of the total positive addition value; from 14 mm to 15.9 mm away from the optical center, the section is 60% of the total positive addition value; from 16 mm to 17.9 mm away from the optical center, the section is 80% of the total positive addition value; from 18 mm to 30 mm away from the optical center, the section is 100% of the total positive addition value. From 30 mm away from the optical center to the edge of the spectacle lens, it is a plano lens or has the same refractive power as the central area, or the distance from the optical center is reduced to 0.5 mm to 1.0 mm, and different sections are set.

[0078] Five basic positive addition value sub-levels are set in the peripheral area of the front lens: the full circular or nasal peripheral positive addition values are +1.00D, +1.50D, +2.00D, +2.75D, +3.50D respectively. The temporal peripheral area < the nasal peripheral area positive addition value +0.50D to +1.50D. The differential positive addition value in the peripheral area of the front lens is supplemented to the total positive addition value of the front and rear lenses.

[0079] For the differential positive addition value, according to the onset age of myopia being earlier than 10 years old, the annual increase in myopia degree > -0.75D, the annual increase in axial length or peripheral refraction of the retina, children with both parents being highly myopic, and the daily close-range eye use time > 10 hours, it is calculated by adding +0.10D to +0.50D individually according to each inducing factor. For the full circular lens in the peripheral area, +0.50D to +2.50D is added, and the refractive power of the nasal peripheral area > the temporal peripheral area +0.25D to +1.00D.

[0080] This kind of spectacle lens has double-zone and bilateral positive addition values for the front and rear lenses. The peripheral area of the front lens is set as a perfect circle, horizontal ellipse, vertical ellipse, semi-circular, fan-shaped, arc-shaped with the optical center as the axis, and there are 9 face shapes including perfect circle, horizontal ellipse, vertical ellipse for the nasal and temporal peripheral areas. The peripheral area of the rear lens is set as a perfect circle, horizontal ellipse, vertical ellipse with the optical center as the axis, and there are 6 face shapes including perfect circle, horizontal ellipse, vertical ellipse for the nasal and temporal peripheral areas. Any one of the 9 face shapes in the front lens can be combined with any one of the 6 face shapes in the rear lens. It is preferably composed of the same face shape combination of the front and rear lenses.

[0081] For the combined face shapes of the front and rear lenses, their sections closely correspond to each other before and after, and at least 90% of the corresponding areas closely correspond to each other before and after.

[0082] This kind of spectacle lens is manufactured as follows: The optical surface profiles of the central area and the peripheral area of the front mirror surface before molding are adopted. The base positive addition value in the peripheral area of the front mirror surface is set to at least 70% to 90% of the total positive addition value, and it is molded into a preform blank with the refractive surface profile of the front mirror surface. After the preform blank is formed into the refractive surface profiles of the central area and the peripheral area of the rear mirror surface through the spectacle lens workshop, the refractive power accuracy of the workshop forming is ±0.01D. The refractive power of the peripheral area of the rear mirror surface is the total refractive power of the front and rear mirror surfaces minus the base positive addition value, and the refractive power gradient difference of the formed peripheral area of the rear mirror surface is +0.05 to +0.15D. The optical centers of the central areas and the peripheral areas of the formed front and rear mirror surfaces correspond to each other, and the optical surface profiles of the front and rear mirror surfaces correspond at least in the azimuth range of 90°. The optical centers of the nasal-temporal peripheral areas of the front and rear mirror surfaces are located above the same horizontal diameter of the optical center.

[0083] The diffractive slope ring is arranged on the front mirror surface, the rear mirror surface or embedded in the spectacle lens matrix, and is composed of one, two, three or four layers. The thickness of the composite layer or coating layer ≥ the height of the diffractive slope ring. For this kind of individualized diffractive slope ring type defocus spectacle lens, the peripheral area of the front mirror surface is a diffractive slope ring with a molded refractive surface profile, and the rear mirror surface is formed into a refractive surface profile by numerical control in the workshop.

[0084] The following are examples for illustration of individualized customization, rather than limiting the claims of the present invention:

[0085] Example 1: Manufacture 5 base positive addition values for the full-ring peripheral area diffractive slope ring of the front mirror surface

[0086] The 360° of the full-ring peripheral area are respectively manufactured into +1.00D, +1.50D, +2.00D, +2.75D, +3.50D.

[0087] Example 2: Manufacture 5 base positive addition values for the nasal-temporal peripheral area diffractive slope ring of the front mirror surface

[0088] The nasal side peripheral area NS: the temporal side peripheral area TS are as follows respectively:

[0089] NS +1.00D: TS +0.50D;

[0090] NS +1.50D: TS +1.00D;

[0091] NS +2.00D: TS +1.25D;

[0092] NS +2.75D: TS +2.00D;

[0093] NS +3.50D: TS +2.750D.

[0094] Example 3: Manufacture the positive addition value gradient difference of ±0.01D for the full-ring refractive lens of the rear mirror surface

[0095] Select the pre-mirror formed blank lens, customize it according to the refractive power of the post-mirror in the optical workshop, and turn and manufacture it with a refractive power gradient difference of ±0.01D.

[0096] Example 4: Manufacture of the post-mirror full-ring refractive lens with a positive addition value gradient difference of ±0.05D

[0097] Select the pre-mirror formed blank lens, customize it according to the refractive power of the post-mirror in the optical workshop, and turn and manufacture it with a refractive power gradient difference of ±0.05D.

[0098] Example 5: The post-mirror full-ring refractive lens has a positive addition value gradient difference of ±0.10D

[0099] Select the pre-mirror formed blank lens, customize it according to the refractive power of the post-mirror in the optical workshop, and turn and manufacture it with a refractive power gradient difference of ±0.10D.

[0100] Example 6: Manufacture of the post-mirror full-ring refractive lens with a positive addition value gradient difference of ±0.15D

[0101] Select the pre-mirror formed blank lens, customize it according to the refractive power of the post-mirror in the optical workshop, and turn and manufacture it with a refractive power gradient difference of ±0.15D.

[0102] The individualized diffractive slope-ring defocus spectacle lens of the present invention adopts double mirrors with positive addition values on both sides. The base positive addition value formed by the diffractive slope-ring array is adopted in the peripheral area of the pre-mirror, which has a relatively large positive addition value of refractive power. The peripheral area of the post-mirror adopts a refractive lens and is formed by turning and processing on a numerically controlled lathe in the optical workshop, with an accurate turning accuracy of 0.01 degree, achieving the customization of lenses with individual differences.

[0103] This kind of spectacle lens produces unexpected technical effects and has prominent substantive features and significant progress.

[0104] Finally, it should be clarified that the changes and modifications to the design parameters of the central area and the peripheral area described in the invention are also within the scope of the rights defined in the present invention.

Claims

1. The individualized diffractive slope-ring type peripheral defocus spectacle lens is a frame spectacle lens, and is characterized in that: Two optical regions, namely a central region and a peripheral region, are respectively arranged on the front and rear lens surfaces. The central region of the front and rear lens surfaces is a refractive lens, and according to the myopia degree of an individual spectacle wearer, the refractive power is set to be from 0.00D to -10.00D. The peripheral region of the front lens surface consists of multiple diffractive slope-ring arrays, and the refractive power is set to be a base positive addition value from +0.50D to +4.00D. The peripheral region of the rear lens surface is a refractive lens, and according to the individual spectacle wearer's peripheral defocus correction amount, the refractive power is an additional differential positive addition value from +0.50D to +3.00D based on the concave lens degree of the central region. The base positive addition value of the front lens surface + the differential positive addition value of the rear lens surface = the total positive addition value of the front and rear lens surfaces from +1.00D to +7.00D. The differential positive addition value of the rear lens surface or the gradient difference of the total positive addition value of the front and rear lens surfaces is ±0.01 to 0.25D. At least 5 positive addition value sections and at least 5 positive addition value sub-levels are respectively arranged in the peripheral regions of the front and rear lens surfaces. The total refractive power of the peripheral regions of the front and rear lens surfaces is set to be 360° equal refractive power, or the refractive power of the nasal side peripheral region > the refractive power of the temporal side peripheral region +0.50D to +2.00D.

2. The individualized diffractive slope-ring type peripheral defocus spectacle lens according to claim 1, is characterized in that: The width of the diffractive slope-ring is from 5nm to 2mm, the height is from 0.1nm to 16μm, the steep side faces the optical center, and the gentle side is away from the optical center. The included angle of the diffractive slope-ring is <5°. According to the different widths of the diffractive slope-ring at the mm level, μm level, and nm level in the peripheral region, at least 6 to 120 concentric-axis diffractive slope-ring arrays are arranged. The gap between two adjacent diffractive slope-rings is either seamless connection or a spacing from 0.5nm to 0.25mm. The same diffractive slope-ring is set to have the same circumferential azimuth angle, the same width, the same height, and the same refractive power. The cross-sections of multiple diffractive slope-rings are serrated and convex-concave connected to each other.

3. The individualized diffractive slope-ring type peripheral defocus spectacle lens according to claim 1, is characterized in that: The central area of the front lens surface is set as a perfect circle, a horizontal ellipse, a vertical ellipse, or an up-and-down window shape with the optical center as the optical axis according to the shape of the peripheral area. The horizontal diameter of the central area is 8 mm to 14 mm, and the vertical diameter is equal to the diameter of the spectacle lens. The diffraction slope ring array in the peripheral area of the front lens surface is divided into: a full ring means within the 360° circumferential azimuth angle of the peripheral area; a semi-ring means within the 180° circumferential azimuth angle occupied by the nasal and temporal peripheral areas respectively; a fan-shaped ring means within the inner arc <180° circumferential azimuth angle and the outer arc ≤180° circumferential azimuth angle occupied by the nasal and temporal peripheral areas respectively, or the diffraction slope rings are respectively arrayed in the nasal and temporal peripheral areas, forming a nasal-temporal perfect circle, a horizontal ellipse, a vertical ellipse, or an arc-top shape. The central area of the rear lens surface is set as a perfect circle, a horizontal ellipse, or a vertical ellipse with the optical center as the optical axis according to the shape of the peripheral area, or the nasal and temporal peripheral areas are respectively set as a perfect circle, a horizontal ellipse, or a vertical ellipse. The front and rear lens surfaces select the same-shaped central and peripheral areas, or the front lens surface selects any shape, and the rear lens surface selects a central area that is a perfect circle, a horizontal ellipse, or a vertical ellipse, or selects the nasal and temporal peripheral areas to be any one of a perfect circle, an ellipse, or a vertical ellipse.

4. The individualized diffractive slope ring type peripheral defocus spectacle lens according to claim 1, characterized in that: a compound substrate is provided in the lower side area of the central area of the front lens surface or the rear lens surface, and a prism lens with a prism diopter of 0.5Δ to 6.0Δ is provided towards the nasal side.

5. The individualized diffractive slope ring type peripheral defocus spectacle lens according to claim 1, characterized in that: the peripheral area of the front lens surface is set as 4 different refractive power diffractive slope ring quadrant areas, namely the upper quadrant area, the lower quadrant area, the nasal quadrant area, and the temporal quadrant area, each quadrant area occupying within the 90° circumferential azimuth angle, or the nasal and temporal quadrant areas are set as diffractive slope ring quadrant areas, and the upper and lower quadrant areas are set as refractive quadrant areas, and the refractive power of the diffractive slope ring in the nasal quadrant area > that in the temporal quadrant area, and the refractive power of the refraction in the lower quadrant area > that in the upper quadrant area.

6. The individualized diffractive slope ring type peripheral defocus spectacle lens according to claim 1, characterized in that: the peripheral areas of the front and rear lens surfaces are bilateral mirror surfaces with double positive addition values. The positive addition value refers to the additional defocus amount. The additional positive addition value in the peripheral area of the front lens surface refers to the refractive power of the diffractive slope ring. The additional positive addition value in the peripheral area of the rear lens surface refers to the additional positive addition value of the individual spectacle wearer's difference amount on the basis of the base positive addition value. The base positive addition value is 90% to 10% of the total positive addition value, and the difference positive addition value is 10% to 90% of the total positive addition value. The refractive power of the peripheral area of the front lens surface = the base positive addition value, the refractive power of the peripheral area of the rear lens surface = the refractive power of the concave lens in the central areas of the front and rear lens surfaces + the difference positive addition value. The total refractive power of the peripheral areas of the front and rear lens surfaces ≡ the refractive power of the peripheral area of the front lens surface + the refractive power of the peripheral area of the rear lens surface. The difference 2 positive addition value or the total positive addition value gradient difference is ±0.05 D to ±0.15 D, and the included angle of the diffractive slope ring < 2°, and there is no prism diopter in the diffractive slope ring area.

7. The individualized diffractive slope ring type peripheral defocus spectacle lens according to claim 1, characterized in that: In each diffraction slope ring in the peripheral area of the front lens surface, the width and height of the diffraction slope ring gradually decrease from the center to the periphery, and the number of slope rings increases, so as to gradually increase the positive addition value in the diffraction slope ring area. The refractive power between adjacent two diffraction slope rings is set in a progressive manner. In the peripheral area of the rear lens surface, the refractive power of the refractive lens gradually increases from the edge of the central area, or a sectional gradient area is formed.

8. The personalized diffraction slope ring type peripheral defocus spectacle lens according to claim 1, characterized in that: the refractive powers of the nasal peripheral diffraction area and the temporal peripheral diffraction area are customized according to the refractive detection degrees of the nasal and temporal peripheral retinas of the individual spectacle wearer, or five secondary positive addition values of N+n:T+n are set, where: N+ represents the positive addition value of the nasal peripheral diffraction area, T+ represents the positive addition value of the temporal peripheral diffraction area, and n represents the positive addition value degree; they are respectively: N+1.00D:T+0.50D; N+2.00D:T+1.25D; N+3.00D:T+2.0D; N+4.00D:T+2.75D; N+5.00D:T+3.50D. The five secondary positive addition values respectively correspond to five myopic refractive degrees of 0.00D to -2.00D; -2.01D to -3.00D; -3.01D to -4.00D; -4.01D to -6.00D; ≥-6.01D. The refractive power of the full-ring peripheral diffraction area is based on the positive addition values of 1.00D, 2.0D, 2.50D, 3.00D, 3.75D. The five secondary positive addition values respectively correspond to five myopic refractive degrees of 0.00D to -2.00D; -2.01D to -3.00D; -3.01D to -4.00D; -4.01D to -6.00D; ≥-6.01D. For children and adolescents with myopia whose onset of myopia is earlier than 12 years old, with an annual increase of more than -1.00D, an annual increase in axial length, and both parents being highly myopic, on the basis of the five secondary positive addition values, N+0.75D:T+0.50D is respectively increased.

9. The personalized diffraction slope ring type peripheral defocus spectacle lens according to claim 1, characterized in that: the differential positive addition value is calculated by individually adding +0.10D to +0.50D according to the factors that the onset age of myopia is earlier than 10 years old, the annual increase in myopic degree > -0.75D, the annual increase in axial length or peripheral retina refraction, both parents being highly myopic, and the daily close-range eye use time > 10 hours. For the full-ring lens in the peripheral area, +0.50D to +2.50D is added, and the refractive power of the nasal peripheral area > the temporal peripheral area by +0.25D to +1.00D.

10. The personalized diffraction slope ring type peripheral defocus spectacle lens according to any one or more of claims 1 to 9, characterized in that: The spectacle lens is manufactured as follows: The optical surface profiles of the central area and the peripheral area of the front mirror surface before molding are adopted. The base positive addition value in the peripheral area of the front mirror surface is set to at least 70% to 90% of the total positive addition value, and it is molded into a preformed blank with the refractive surface profile of the front mirror surface. After the preformed blank is formed into the refractive surface profiles of the central area and the peripheral area of the rear mirror surface through the spectacle lens workshop, the accuracy of the refractive power during the workshop forming is ±0.01 D. The refractive power of the peripheral area of the rear mirror surface is the total refractive power of the front and rear mirror surfaces minus the base positive addition value. The refractive power gradient difference in the peripheral area of the formed rear mirror surface is +0.05 to +0.15 D. The optical centers of the central areas and the peripheral areas of the front and rear mirror surfaces after molding correspond to each other, and the optical surface profiles of the front and rear mirror surfaces correspond to each other in at least a 90° azimuth range. The optical centers of the nasal and temporal peripheral areas of the front and rear mirror surfaces are located above the same horizontal diameter of the optical center.

Images