Ophthalmic lenses, their design methods, their manufacturing methods, and ophthalmic lens sets

Abstract

To enable the cylinder power of an outside optical part to be controlled.SOLUTION: Provided are an ophthalmic lens 6 and its related technologies, the ophthalmic lens including an optical part 4 that has a near part provided with a near power corresponding to near distance, a far part provided with a far power corresponding to a farther distance than the near distance, and an annular intermediate part that links between the near part and the far part, with a central optical part that is the near part or the far part being disposed at center, an outside optical part that is the far part or the near part not disposed at center being disposed in annular form on the outer edge of the intermediate part. The ophthalmic lens 6 further has a front surface disposed on the object side and a rear surface that faces the front surface, the front surface is the composite surface of a progressive surface and a toric surface, the cylinder power for the near part being equal to an astigmatism correction power that is set to the near part, the cylinder power for the far part being equal to an astigmatism correction power that is set to the far part.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to an ophthalmic lens, a method for designing the same, a method for manufacturing the same, and an ophthalmic lens set.

Background Art

[0002] As ophthalmic lenses, for example, contact lenses and intraocular lenses are known (in this specification, spectacle lenses are excluded as ophthalmic lenses). For example, among contact lenses, there is a multifocal contact lens (multifocal lens) that ensures a near vision power for seeing near distances and a far vision power for seeing far distances with a single lens. As the configuration of this multifocal lens, for example, a near vision portion having a near vision power is arranged at the center of the lens, an intermediate portion that causes a change in power is arranged annularly with respect to the outer edge thereof, and a far vision portion having a far vision power is arranged annularly with respect to the outer edge thereof (for example, [FIG. 1] and [FIG. 4] of Patent Document 1). Conversely, a configuration in which a far vision portion having a far vision power is arranged at the center of the lens, an intermediate portion that causes a change in power is arranged annularly with respect to the outer edge thereof, and a near vision portion having a near vision power is arranged annularly with respect to the outer edge thereof is also known (for example, [FIG. 14] of Patent Document 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] Before explaining the problems of the present invention, let's first describe the optical part. Hereafter, we will use a multifocal contact lens (multifocal lens; also simply referred to as a lens) as an example, in which a near-vision portion with near-vision power is arranged in the center of the lens, an intermediate portion that causes a change in power is arranged in a ring around its outer edge, and a distance-vision portion with distance-vision power is arranged in a ring around the outer edge of the intermediate portion.

[0005] Figure 1 is a schematic diagram of a conventional multifocal lens viewed from above. In Figure 1, the lens is placed on a horizontal stand with its front surface (convex surface) facing upwards, and the view is from the top to the bottom in the optical axis direction. The same applies to planar views from here on. The distance on the lens when viewed from a planar perspective is called the planar viewing distance. Reference numeral 10 indicates the near-vision section, 20 the far-vision section, 30 the intermediate section, 40 the optical section, 50 the peripheral section, and 60 the multifocal lens. The reference numerals with the last digit 0 removed correspond to the respective parts of the lens according to this embodiment shown later. Hereafter, reference numerals will be omitted.

[0006] As shown in Figure 1, the optical center O of the lens is concentric with a near-vision section in the center, an annular intermediate section around its outer edge, and a far-vision section further around its outer edge. In this example, the optical center O coincides with the geometric center. Thus, an optical section having a near-vision section, an intermediate section, and a far-vision section is formed. Furthermore, an annular peripheral section is located at the outer edge of the optical section. The peripheral section usually has a flange shape that allows it to easily fit behind the eyelid when the lens is placed on the cornea. In other words, the lens in this example is composed of an optical section and a peripheral section. However, the optical section and the peripheral section are distinguished in order to perform the functions described above, and there is no clear boundary between the optical section and the peripheral section that can be visually confirmed, such as a step or something similar.

[0007] Figure 2 is a schematic plan view of a toric multifocal lens as a reference example, showing the schematic power distribution (tangential) in the X-direction (bottom figure) and the schematic power distribution (tangential) in the Y-direction (right figure). In both power distributions, the vertical axis is power (unit: diopters (D)) and the horizontal axis is distance from the optical center (mm). In the figure showing the schematic power distribution in the Y-direction (right figure), the vertical axis is the horizontal axis and the left-right axis is the vertical axis. In both power distributions, the solid line represents power in the horizontal (left-right) direction, and the dashed line represents power in the vertical (up-down) direction.

[0008] In Figure 2, α represents the cylinder power of the near-field application section, and β represents the cylinder power of the far-field application section.

[0009] The problems with the present invention will be described below.

[0010] Figure 3 is an explanatory diagram illustrating how astigmatism occurs in the outer optical portion of a multifocal lens.

[0011] As shown in Figure 3, when designing the power distribution of a multifocal lens, the outer optical section already contains cylinder power. Therefore, in the toric multifocal lens shown in Figure 2, the cylinder power of the outer optical section (in this case, the distance vision section) does not match the astigmatism correction power set for the distance vision section. In other words, controlling the cylinder power of the outer optical section was difficult in the toric multifocal lens shown in Figure 2.

[0012] The objective of this invention is to enable control of the cylinder power of the outer optical unit. [Means for solving the problem]

[0013] A first aspect of the present invention is: An ophthalmic lens comprising: a near-vision portion having a near-vision power corresponding to near distances; a far-vision portion having a far-vision power corresponding to distances greater than near distances; and an annular intermediate portion connecting the near-vision portion and the far-vision portion, wherein the central optical portion, which is either the near-vision portion or the far-vision portion, is positioned in the center, and the outer optical portion, which is either the far-vision portion or the near-vision portion and is not positioned in the center, is arranged annularly around the outer edge of the intermediate portion, and further comprising an optical portion having a front surface positioned on the object side and a rear surface facing the front surface, The aforementioned front surface is a composite surface of a progressive surface and a toric surface. The cylinder power of the near-vision section is equal to the astigmatism correction power set in the near-vision section, and the cylinder power of the far-vision section is equal to the astigmatism correction power set in the far-vision section.

[0014] A second aspect of the present invention is an aspect described in the first aspect, In the aforementioned intermediate portion, when viewed in the X direction from the center toward the periphery, there is a portion A1 arranged in an annular shape around the outer edge of the intermediate portion, which has a power that is stronger than the distance power of the distance portion or the near power of the near power of the near power portion, and when viewed in the X' direction, which is the exact opposite direction to the X direction and goes from the center toward the periphery, there is also a portion A1' arranged in an annular shape around the outer edge of the intermediate portion, which has a power that is stronger than the distance power of the distance portion or the near power of the near power portion, and then weakened.

[0015] A third aspect of the present invention is an aspect described in the second aspect, In the near-vision section or the far-vision section located in the center of the optical section, there is a portion A2 in which the power is increased and then weakened when viewed in the X direction from the center toward the periphery, and there is also a portion A2' in which the power is increased and then weakened when viewed in the X' direction, which is the exact opposite direction to the X direction and also from the center toward the periphery.

[0016] A fourth aspect of the present invention is an aspect described in the second or third aspect, The cylinder power of the near-field section and the cylinder power of the far-field section are equal.

[0017] A fifth aspect of the present invention is an aspect described in any one of the first to fourth aspects, wherein the ophthalmic lens is a contact lens.

[0018] A sixth aspect of the present invention is an aspect described in any one of the first to fourth aspects, wherein the ophthalmic lens is an intraocular lens.

[0019] A seventh aspect of the present invention is an ophthalmic lens having a near vision portion having a near vision power corresponding to a near distance, a distance vision portion having a distance vision power corresponding to a distance farther than the near distance, and an annular intermediate portion connecting between the near vision portion and the distance vision portion, wherein a central optical portion that is either the near vision portion or the distance vision portion is disposed at the center, and an outer optical portion that is either the distance vision portion or the near vision portion not disposed at the center is annularly disposed at the outer edge of the intermediate portion, and having a front surface disposed on the object side and a rear surface facing the front surface, the front surface is a composite surface of a progressive surface and a toric surface, A method for designing an ophthalmic lens, which equalizes the cylinder power of the near vision portion and the cylinder power of the distance vision portion.

[0020] An eighth aspect of the present invention is an aspect described in the seventh aspect, wherein in the intermediate portion, when viewed in the X direction from the center toward the periphery, there is a portion A1 that is annularly disposed at the outer edge of the intermediate portion and has a power that is strengthened and then weakened compared to the distance vision power of the distance vision portion or the near vision power of the near vision portion, and when viewed in the X' direction, which is the direction opposite to the X direction and from the center toward the periphery, there is also a portion A1' that is annularly disposed at the outer edge of the intermediate portion and has a power that is strengthened and then weakened compared to the distance vision power of the distance vision portion or the near vision power of the near vision portion.

[0021] A ninth aspect of the present invention is an aspect described in the eighth aspect, wherein In the near-vision section or the far-vision section located in the center of the optical section, there is a portion A2 in which the power is increased and then weakened when viewed in the X direction from the center toward the periphery, and there is also a portion A2' in which the power is increased and then weakened when viewed in the X' direction, which is the exact opposite direction to the X direction and also from the center toward the periphery.

[0022] A tenth aspect of the present invention is an aspect described in the eighth or ninth aspect, The cylinder power of the near-field section and the cylinder power of the far-field section are equal.

[0023] An eleventh aspect of the present invention is an aspect described in any one of the seventh to tenth aspects, The aforementioned ophthalmic lens is a contact lens.

[0024] A twelfth aspect of the present invention is an aspect described in any one of the seventh to tenth aspects, The aforementioned ophthalmic lens is an intraocular lens.

[0025] A thirteenth aspect of the present invention is: A design process for designing an ophthalmic lens by the ophthalmic lens design method described in any one of the seventh to twelveth embodiments, The manufacturing process involves producing the designed ophthalmic lens using processing equipment, This is a method for manufacturing ophthalmic lenses, which have the following characteristics.

[0026] A fourteenth aspect of the present invention is: An ophthalmic lens set comprising a plurality of ophthalmic lenses, each having a near-vision portion with near-vision power corresponding to near distances, a far-vision portion with far-vision power corresponding to distances greater than near distances, and an annular intermediate portion connecting the near-vision portion and the far-vision portion, wherein the central optical portion, which is either the near-vision portion or the far-vision portion, is positioned in the center, and the outer optical portion, which is either the far-vision portion or the near-vision portion and is not positioned in the center, is arranged annularly around the outer edge of the intermediate portion, and each optical portion has a front surface positioned toward the object and a rear surface facing the front surface, The aforementioned front surface is a composite surface of a progressive surface and a toric surface. This is an ophthalmic lens set in which the cylinder power of the near-vision section and the cylinder power of the far-vision section are equal. [Effects of the Invention]

[0027] According to the present invention, it is possible to control the cylinder power of the outer optical unit. [Brief explanation of the drawing]

[0028] [Figure 1] Figure 1 is a schematic diagram of a conventional multifocal lens viewed from above. [Figure 2] Figure 2 is a schematic plan view of a toric multifocal lens as a reference example, showing the schematic power distribution (tangential) in the X-direction cross-section (bottom figure) and the schematic power distribution (tangential) in the Y-direction cross-section (right figure). [Figure 3] Figure 3 is an explanatory diagram illustrating how astigmatism occurs in the outer optical portion of a multifocal lens. [Figure 4] Figure 4 is a schematic plan view of the ophthalmic lens of Example 1, showing the schematic power distribution in the X-direction cross-section (bottom figure) and the schematic power distribution in the Y-direction cross-section (right figure). [Figure 5] Figure 5 is a schematic diagram showing the surface height (sag value) in the circumferential direction centered on the optical center O in the ophthalmic lens of Example 1, where the horizontal axis represents the rotation angle (unit: °) and the vertical axis (downward) represents the sag value. [Figure 6] Figure 6 shows the power distribution of the ophthalmic lens of Example 1 in a planar view. [Figure 7] Figure 7 shows the tangential power distribution in the Y-direction cross-section of the ophthalmic lens of Example 1. [Figure 8] Figure 8 shows the sagittal power distribution in the Y-direction cross-section of the ophthalmic lens of Example 1. [Figure 9] Figure 9 shows the cylinder power distribution of the ophthalmic lens of Example 1 in a plan view. [Figure 10]Figure 10 shows the cylinder power distribution in the Y-direction cross-section of the ophthalmic lens of Example 1. [Figure 11] Figure 11 shows the power distribution of the ophthalmic lens of Example 2 in a planar view. [Figure 12] Figure 12 shows the tangential power distribution in the Y-direction cross-section of the ophthalmic lens of Example 2. [Figure 13] Figure 13 shows the sagittal power distribution in the Y-direction cross-section of the ophthalmic lens of Example 2. [Figure 14] Figure 14 shows the cylinder power distribution of the ophthalmic lens of Example 2 in a plan view. [Figure 15] Figure 15 shows the cylinder power distribution in the Y-direction cross-section of the ophthalmic lens of Example 2. [Modes for carrying out the invention]

[0029] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this embodiment, the explanation will proceed in the following order. 1. Contact lenses 1-1. Multifocal contact lenses 1-2. Preferred example 1 1-3. Preferred example 2 1-4. Preferred example 3 1-5. Other Contact Lenses 2. Contact lens design method (manufacturing method) 3. Intraocular lenses (IOLs) and their design methods (manufacturing methods) 4. Eye lens set 5. Variations

[0030] For configurations not described below, publicly known configurations may be adopted as appropriate. Furthermore, in this specification, "~" refers to a value greater than or equal to a specified value and less than or equal to a specified value. Furthermore, the ophthalmic lenses (contact lenses or the lens body in intraocular lenses) used herein have two opposing surfaces. The side of the ophthalmic lens that faces the retina when worn by the wearer is referred to as the "rear surface," and the opposite side that faces the object is referred to as the "front surface." Furthermore, in this specification, "frequency" refers to power (unit: diopters [D]). Furthermore, in this specification, unless otherwise specified, descriptions of shape refer to the shape of each region (near vision area, far vision area, intermediate vision area) in a plan view. A plan view is the view of the wearer with the eye lens in place, and in this state, the top direction is also called up, the bottom direction is also called down, and the horizontal direction is also called left-right. The left-right direction is the direction when the wearer is viewed from the front. However, if the eye lens is a contact lens, the contact lens may rotate on the cornea. The present invention is not limited to the precise up, down, left, and right directions. In this specification, the optical center O is referred to as the inner side, and the outer edge of the ophthalmic lens as the outer side. The direction from the center to the periphery is the radial direction from the optical center O (which coincides with the geometric center, for example). Hereafter, this will also be simply referred to as the "radial direction." Furthermore, the direction concentric with the optical center O and perpendicular to the radial direction is also referred to as the "circumferential direction." The X' direction is the direction opposite to the X direction, moving from the center to the periphery of the eye lens. For example, let the X direction be to the right and the X' direction be to the left. The direction perpendicular to the X direction is defined as the Y direction. The Y' direction is the exact opposite direction to the Y direction, moving from the center of the eye lens towards the periphery. For example, the Y direction is defined as upward and the Y' direction as downward. The rotation angle from the optical center O is defined as a counterclockwise angle starting from the X direction, with the X direction being 0°, the Y direction 90°, the X' direction 180°, and the Y' direction 270°.

[0031] <1. Contact Lenses> 1-1. Multifocal contact lenses In this embodiment, multifocal contact lenses (multifocal lenses; hereafter also simply referred to as lenses) are primarily used as examples.

[0032] The lens in this embodiment, like the conventional lens described above, comprises a substantially circular optical portion that primarily contributes to optical performance, and an annular peripheral portion located around the periphery of the optical portion.

[0033] As mentioned earlier, the peripheral portion typically has a flange shape that makes it easy for the lens to get caught behind the eyelid when it is placed on the cornea.

[0034] The optical section comprises a near-vision section with a near-vision power for viewing close distances, a far-vision section with a far-vision power for viewing distances greater than near distances (including infinity), and an annular intermediate section connecting the near-vision section and the far-vision section. The intermediate section is a region where the power changes continuously and where the curvature in the radial and circumferential directions changes continuously, and is a region without steps on the lens surface. The intermediate section suppresses the generation of multiple images. In this specification, "near distance" is not limited to any distance shorter than "far distance." Of course, it may also refer to an absolute distance (for example, 100 cm or less, or 40 cm or less, which is the reading distance).

[0035] In this embodiment, a near-vision section is positioned in the center, an annular intermediate section is positioned around the outer edge of the near-vision section, and a far-vision section is positioned annularly around the outer edge of the intermediate section. In other words, in this example, the "central optical section" is the near-vision section, and the "outer optical section" is the far-vision section.

[0036] In this example, the optical center O is shown to coincide with the geometric center of the lens, but the present invention is not limited to this (the same applies hereafter).

[0037] In this embodiment, the near-vision portion of the optical section of the lens refers to the area between the point where the power decreases last when viewed from the optical center O in the X direction (direction toward the outer edge) and the point where the power decreases last when viewed from the optical center O in the X' direction. The phrase "last" is used to account for cases where there is a portion in the center of the near-vision portion where the power is less than or equal to the near-vision power.

[0038] In this embodiment, the annular intermediate portion of the optical section of the lens refers to the area from the outer edge of the near-vision portion to the portion where the power decreases to the far-vision power, when viewed in the X direction. In the case of Preferred Example 2 described later, it refers to the area from the outer edge of the near-vision portion to the portion where the power decreases, then decreases further below the far-vision power, and then increases to the far-vision power. In either case, the same applies when viewed in the X' direction.

[0039] In the optical section of the lens of this embodiment, the annular distance-vision portion is the part other than the near-vision portion and the intermediate portion, and refers to the portion after the power decreases to the distance-vision power in the intermediate portion when viewed in the X and X' directions.

[0040] As mentioned earlier, in this embodiment of the lens, the near-vision portion is located in the center, an annular intermediate portion is located on the outer edge of the near-vision portion, and the far-vision portion is located in an annular shape on the outer edge of the intermediate portion. Due to this relationship, the power of the optical center O is set higher than that of the far-vision portion. In this specification, "high power" means a large power value. The same applies to the high and low power values ​​hereafter.

[0041] Typically, lens prescriptions include distance power S and add power ADD (and astigmatism power C if astigmatism correction is required), but near power is the value of (S + ADD) (each power is in units of [D], and so on). The near power is defined as the power near the optical center O in the near vision portion. While the near power is defined as the power at the position of the optical center O (i.e., power at optical center O = near power), if the optical center O is offset from the geometric center, the near power may be slightly offset from the near power at the geometric center.

[0042] In this embodiment, the front surface is a composite surface of a progressive surface and a toric surface, the cylinder power of the near vision section is equal to the astigmatism correction power set in the near vision section, and the cylinder power of the far vision section is equal to the astigmatism correction power set in the far vision section. "Near vision cylinder power" refers to the astigmatism correction power in the near vision area. More specifically, it represents the absolute value of the difference between the radial (tangential) cylinder power in the near vision area and the circumferential (sagittal) cylinder power perpendicular to the radial direction. "Cylinder power of the remote-use section" similarly represents the absolute value of the difference between the radial (tangential) cylinder power and the circumferential (sagittal) cylinder power in the remote-use section. In this embodiment, the cylinder power of the near-vision section is equal to the astigmatism correction power set for the near-vision section. Similarly, the cylinder power of the far-vision section is equal to the astigmatism correction power set for the far-vision section. This "equal" includes both perfect matches and within tolerance (±0.12D). The astigmatism correction power set for the near-vision section and the astigmatism correction power set for the far-vision section may, in most cases, be the same (specifically, the astigmatism correction power for distance vision is adopted), or they may be different. The cylinder power of the near-vision section and the cylinder power of the far-vision section may be equal, or they may be different. If the astigmatism correction power set for the near-vision section and the astigmatism correction power set for the far-vision section are different in their prescriptions, then the cylinder power of the near-vision section and the cylinder power of the far-vision section will naturally be different as well.

[0043] Incidentally, the prescription values ​​of the wearer's information are listed in the specifications sheet for the ophthalmic lens. In other words, if the specifications sheet is available, it is possible to identify the ophthalmic lens based on the prescription values ​​of the wearer's information. Furthermore, ophthalmic lenses are usually sold as a set with the specifications sheet. Therefore, the technical concept of the present invention is reflected in the progressive power lenses with attached specifications sheets, and the same applies to the set of ophthalmic lenses and specifications sheets.

[0044] As mentioned earlier, unintended cylinder power is generated on the peripheral side of the optical section having a progressive structure. To eliminate this unintended cylinder power, a toric surface is combined with the progressive structure to counteract it. In this embodiment, the progressive structure is realized on the front surface. The toric surface is then combined with the front surface, which is the progressive surface. For details on the combination of the progressive surface and the toric surface, please refer to the entire description in WO97 / 019382 (Japanese Patent No. 3852116). When the progressive structure is realized on the front surface, there are no limitations on the shape of the rear surface, but as an example, the rear surface (at least the rear side of the optical section) is spherical or toric.

[0045] According to this embodiment, the generation of unintended cylinder power in the outer optical section is suppressed. There are no specific limitations on the shape of the front surface; any shape that cancels out the unintended cylinder power generated in the outer optical section is acceptable. Preferred examples of specific embodiments are as follows.

[0046] 1-2. Preferred example 1 This embodiment may also apply the invention described in WO2020 / 075312 (Japanese Patent No. 6559866) as a preferred example.

[0047] By adopting Preferred Example 1, a wide area with low cylinder power can be secured in the far-field or near-field of the outer edge of the intermediate section. In this embodiment, this effect is utilized to enable control of the cylinder power of the outer optical section.

[0048] As described in the section on the problems of this invention, when designing the power distribution of the toric multifocal lens shown in Figure 2, the outer optical section already contains cylinder power. Therefore, in the toric multifocal lens shown in Figure 2, the cylinder power of the outer optical section (in this case, the distance vision section) no longer matches the astigmatism correction power set for the distance vision section.

[0049] Therefore, by adopting Preferred Example 1, it becomes possible to control the cylinder power already contained in the outer optical unit.

[0050] Originally, in Preferred Example 1, a key technical feature is that unintended cylinder power is canceled out in the distance or near vision portion of the outer edge of the intermediate section, resulting in a wide area with low cylinder power. One of the features of this embodiment is that this technical feature is utilized to control the cylinder power that does not match the astigmatism correction power (for example, by canceling out said cylinder power), so that the cylinder power of the near vision portion is equal to the astigmatism correction power set in the near vision portion, and the cylinder power of the distance vision portion is equal to the astigmatism correction power set in the distance vision portion.

[0051] The following is a summary of the contents of the said international publication, but the contents of the said international publication can be fully incorporated into this specification. In order to simplify the description in this specification, the description will be omitted when the distance-reading part is located in the center and the near-reading part is located in a ring around the outer edge of the center.

[0052] Preferred examples of this embodiment are as follows: "In the above-mentioned intermediate portion, when viewed in the X direction, there is a portion A1 arranged in an annular shape around the outer edge of the intermediate portion, which has a power that is stronger than or weaker than the distance power of the distance portion or the near power of the near power portion, and when viewed in the X' direction, which is the exact opposite direction to the X direction and extends from the optical center O toward the periphery, there is also a portion A1' arranged in an annular shape around the outer edge of the intermediate portion, which has a power that is stronger than or weaker than the distance power of the distance portion or the near power of the near power portion," In the above-mentioned intermediate portion, when viewed in the Y direction, there is a portion B1 arranged in an annular shape around the outer edge of the intermediate portion, which has a power that is stronger than or weaker than the distance power of the distance portion or the near power of the near power of the near power portion, and when viewed in the Y' direction, which is the exact opposite direction to the Y direction and extends from the optical center O toward the periphery, there is also a portion B1' arranged in an annular shape around the outer edge of the intermediate portion, which has a power that is stronger than or weaker than the distance power of the distance portion or the near power of the near power portion, The above optical part A is also the above part A1 and A1', The above-mentioned portion B of the optical unit is also portion B1 and portion B1'.

[0053] In this specification, when a near-vision section is located in the center and a far-vision section is arranged in a ring around the outer edge of the center, "strengthening the far-vision power" in the far-vision section means strengthening it in the direction that allows you to see further away, i.e., in the negative direction, and thus decreasing the power (e.g., 0.00D → -0.10D). Conversely, "weakening the far-vision power" means weakening it in the direction that makes it difficult to see far away, i.e., in the positive direction, and thus increasing the power (e.g., -0.10D → 0.00D). On the other hand, when the distance vision portion is located in the center and the near vision portion is arranged in a ring around the outer edge of the center, "strengthening the near vision power" in the near vision portion means strengthening it in the direction that allows you to see things closer, i.e., in the positive direction, and thus increasing the power (e.g., 5.00D → 5.10D). Conversely, "weakening the near vision power" means weakening it in the direction that makes it difficult to see things closer, i.e., in the positive direction, and thus decreasing the power (e.g., 5.10D → 5.00D). In other words, at a stage where it is still undecided whether the distance-vision part or the near-vision part will be located on the outer edge of the center, "strengthening the power" means strengthening the distance-vision power or the near-vision power, and "weakening the power" means weakening the distance-vision power or the near-vision power.

[0054] The intermediate portion of the lens in this embodiment has a shape in which, when viewed in the X direction of portion A1 and the X' direction of portion A1', the power is increased from the distance power towards distance vision, and then gradually decreases until it reaches the distance power. Here, portion A1 and portion A1' refer to the parts within the intermediate portion in which, for example, when viewed in the X direction of portion A1, the power decreases, then decreases to below the distance power (preferably monotonically decreasing), and then increases again until it reaches the distance power (preferably monotonically increasing).

[0055] In the lens of this embodiment, it is preferable that the cylinder power (unit: diopters) when viewed in the X direction and X' direction satisfies the following conditions. <Condition 1-1> (The cylinder power when the power is increased beyond the above distance vision power in section A1, then decreased to reach the above distance vision power) ≤ 0.30D (preferably 0.25D, more preferably 0.20D, even more preferably 0.15D) <Condition 2-1> (The cylinder power when the degree of focus is increased beyond the above distance focus degree in the above section A1', and then decreased to reach the above distance focus degree) ≤ 0.30D (preferably 0.25D, more preferably 0.20D, even more preferably 0.15D) If all of the above conditions are met, a wide area with a small absolute value of cylinder power can be reliably secured in the far-field portion of the outer edge of the intermediate section.

[0056] Conditions 1-1 and 2-1 above may be replaced with conditions 1'-1 and 2'-1 below, or added to conditions 1-1 and 2-1 above. <Condition 1'-1> (Cylinder power when the degree of focus is increased beyond the above distance focus degree in section A1, then decreased to reach the above distance focus degree) / (Maximum cylinder power in the above intermediate section) ≤ 0.30 (preferably ≤ 0.25, more preferably ≤ 0.20, even more preferably ≤ 0.15) <Condition 2'-1> (Cylinder power when the degree of focus is increased beyond the above distance focus degree in section A1' and then decreased to reach the above distance focus degree) / (Maximum cylinder power in the above intermediate section) ≤ 0.30 (preferably ≤ 0.25, more preferably ≤ 0.20, even more preferably ≤ 0.15) If all of the above conditions are met, the cylinder power generated in the middle of the lens will reliably and quickly decrease when viewed from the center towards the periphery (i.e., in the X and X' directions).

[0057] Furthermore, it is preferable that there is only one location where the power is minimal in section A1, and also only one location where the power is minimal in section A1'. This provision eliminates the need to create numerous small indentations when viewed in the power plot, thus avoiding complexity in lens design. However, the above provision is not mandatory, and it is permissible to have, for example, two or three locations where the power is minimal.

[0058] Furthermore, the planar viewing distance L between the point in section A1 where the power is minimal (at the outermost edge) and the point in section A1' where the power is minimal (at the outermost edge) is preferably 2.0 to 5.0 mm. The lower limit is more preferably 2.2 mm, and the upper limit is more preferably 4.8 mm. This specification ensures that the position where the power decreases and then increases is appropriate, and that a distance-vision section with low cylinder power is secured based on specific dimensions. However, the above numerical range is not mandatory, and the planar viewing distance L may be set as appropriate depending on the type of lens.

[0059] Furthermore, the ratio of the difference between the minimum value of the frequency in sections A1 and A1' and the distance frequency, with respect to the difference between the near frequency and the distance frequency, is preferably 0.15 or more and 1.0 or less. The lower limit of each is more preferably 0.25, even more preferably 0.30, and very preferably 0.40, and the upper limit is more preferably 0.90, even more preferably 0.80, and very preferably 0.70.

[0060] For example, when viewed in the X direction, after the above-mentioned frequency change in the intermediate portion leads to the distance-vision frequency, the frequency plot may not only remain constant, but may also show a monotonically increasing or monotonically decreasing frequency. However, since the distance-vision portion is the part equipped with a distance-vision frequency for viewing a predetermined distance further than the near distance, excessive frequency changes are undesirable, and it is preferable to keep it within a range of ±0.50D (preferably ±0.25D) from the distance-vision frequency.

[0061] Similarly, the central near-vision section may have a frequency plot where the frequency increases or decreases compared to the near-vision frequency. However, since the near-vision section is the part equipped with the near-vision frequency for viewing near distances, excessive frequency changes are undesirable, and it is preferable to keep it within a range of ±0.50D (preferably ±0.25D) from the near-vision frequency. Furthermore, if the frequency in the near-vision section decreases below the near-vision frequency, it will result in insufficient frequency for viewing the aforementioned near distances, which is undesirable. Therefore, it is even more preferable to keep it within a range of +0.50D (preferably +0.25D) from the near-vision frequency. In addition, in order to ensure sufficient near-vision frequency in the near-vision section, the near-vision section may be provided with a shape in which the frequency is increased towards near-vision when viewed from the optical center O in the X and X' directions.

[0062] In preferred example 2, the cylinder power is 0.25D or less in the far-field or near-field of the outer edge of the intermediate section, and is almost zero. In other words, the cylinder power generated in the intermediate section decreases rapidly, and a wide area with low cylinder power can be secured in the far-field or near-field of the outer edge of the intermediate section.

[0063] Furthermore, the lens of this embodiment can achieve low cylinder power over a wide range in the long-distance viewing area through the above configurations. Specifically, when the straight line X-X' is rotated from 0 to 180° around the optical center O with respect to the lens, it is preferable that the portion of the long-distance viewing area where the cylinder power is 0.50D or less accounts for 80 area or more, more preferably 90 area or more, and even more preferably 95 area or more.

[0064] In this specification, "area %" means the percentage of the total area of ​​the portion that has the shape described above when the line X-X' is rotated from 0 to 180° around the optical center O, as viewed from the optical center O, relative to the optical portion when viewed from above. (For example, the two portions of the sector enclosed by the optical center O and the outermost arc of the optical portion (part A1 between 0° and 180°, and part A1' between 180° and 360°)).

[0065] Incidentally, as mentioned earlier, there is no visible boundary between the optical and peripheral parts of a lens, but it can be determined by using a device that measures the lens power (power meter).

[0066] 1-3. Preferred example 2 This embodiment may apply the invention described in WO2018 / 138931 (Japanese Patent No. 6188974) as a preferred example. The contents of the said international publication are summarized below, but all of the contents of the said international publication can be incorporated into this specification. In order to simplify the description of this specification, the description will be omitted when the distance-use portion is located in the center and the near-use portion is arranged in a ring around the outer edge of the center.

[0067] Preferred examples of this embodiment are as follows: "In the above central optical section, when viewed in the X direction, there is a portion A2 in which the intensity is increased and then weakened, and when viewed in the X' direction, which is the exact opposite direction to the X direction and extends from the optical center O toward the periphery, there is also a portion A2' in which the intensity is increased and then weakened." In the above central optical section, when viewed in the Y direction, there is a portion B2 in which the intensity is increased and then weakened, and when viewed in the Y' direction, which is the exact opposite direction to the Y direction and extends from the optical center O toward the periphery, there is also a portion B2' in which the intensity is increased and then weakened. The above optical part A is also the above part A2 and A2', The above-mentioned portion B of the optical unit is also portion B2 and portion B2'.

[0068] Furthermore, it is preferable that there is only one location where the frequency is maximum in section A2, and also only one location where the frequency is maximum in section A2'. In other words, it is preferable that there are two convex sections (i.e., one concave section) when viewed in a frequency plot. This provision eliminates the need to have numerous small convex sections when viewed in a frequency plot.

[0069] Furthermore, the planar viewing distance L between the point where the power is maximum in section A2 and the point where the power is maximum in section A2' is preferably 1.0 to 2.8 mm. The lower limit is more preferably 1.2 mm, even more preferably 1.4 mm, and very preferably 1.6 mm, and the upper limit is more preferably 2.6 mm, and even more preferably 2.4 mm. This specification ensures that the position where the power increases and then decreases is appropriately determined. However, this is not mandatory, and the planar viewing distance L may be set as appropriate depending on the type of lens.

[0070] Furthermore, it is preferable that the difference between the maximum frequency and the near frequency in section A2 is 0.05 to 0.25D, and that the difference between the maximum frequency and the near frequency in section A2' is also 0.05 to 0.25D. The lower limit of each is more preferably 0.10D, even more preferably 0.12D, and very preferably 0.15D, and the upper limit is more preferably 0.20D.

[0071] The present invention does not exclude cases where, in addition to the central near-use section and the peripheral far-use section, an annular near-use section is provided on an even more peripheral edge. Furthermore, as will be described in detail later, the same applies when a far-use section is provided in the center, a near-use section is provided on the peripheral edge, and an annular far-use section is provided on an even more peripheral edge.

[0072] In this embodiment, the lens has a shape in which, in sections A2 and A2', the power is increased from the near-vision power towards near vision, and then gradually decreased until it reaches the far-vision power. For example, when the straight line X-X' is rotated from 0 to 180° around the optical center O with respect to the lens, it is preferable that the portion having this shape accounts for 50% or more of the entire optical part (for convenience of explanation, also simply referred to as the optical part), more preferably 80% or more, and even more preferably 90% or more.

[0073] By adopting this preferred example, when the near-vision section is located in the center of the optical section, it is possible to ensure sufficient near-vision power in the near-vision section while maintaining a good balance between the near-vision section and the far-vision section located on its outer edge. When the far-vision section is located in the center of the optical section, it is possible to ensure sufficient far-vision power in the far-vision section while maintaining a good balance between the far-vision section and the near-vision section located on its outer edge.

[0074] 1-4. Preferred example 3 In this embodiment, the diameter of the human entrance pupil (hereinafter also referred to as the entrance pupil diameter) can be used regardless of age or gender. In this specification, the entrance pupil diameter refers to the diameter formed on the lens (more precisely, on the front surface of the lens) by the light beam passing through the ophthalmic lens that enters the aperture (in this case, the wearer's pupil). In other words, the entrance pupil diameter refers to the diameter of the circular area of ​​the lens in a planar view. For example, the assumed entrance pupil diameter may be 4.0 to 5.0 mm, or it may be 4.4 mm. Hereafter, 4.4 mm will be given as the assumed entrance pupil diameter. The assumed entrance pupil diameter is also the diameter of a virtual circle centered on the optical center O. The assumed entrance pupil diameter is sometimes simply called the entrance pupil diameter. The assumed entrance pupil diameter is defined assuming that the ophthalmic lens is worn by the wearer with the center of the wearer's pupil and the optical center aligned.

[0075] The statement "the outer edge of the intermediate portion is within the assumed entrance pupil diameter" stipulates that at least a portion of the distance-vision portion, which is the outer optical part, is within the entrance pupil diameter. The statement "the outer edge of the outer optical part is outside the assumed entrance pupil diameter" stipulates that the distance-vision portion is large enough to extend beyond the range of the entrance pupil diameter.

[0076] In the optical portion of the ophthalmic lens according to this embodiment, within the assumed entrance pupil diameter, the ratio of the far-vision power group to the near-vision power group when viewed in the X direction (ratio X1) is different from the ratio of the far-vision power group to the near-vision power group when viewed in the Y direction (ratio Y1). More specifically, the ratio X1 of the far-vision power group to the near-vision power group constituting the power distribution of part A of the optical portion when viewed in the X direction is different from the ratio Y1 of the far-vision power group to the near-vision power group constituting the power distribution of part B of the optical portion when viewed in the Y direction.

[0077] In this specification, the power distribution of the optical part refers to the following plot. The horizontal axis of the plot shows the distance from the optical center O in the X-direction cross section when the lens is viewed from above (unit: mm). The vertical axis shows the spherical power of the lens (unit: diopters [D]). The same applies to plots of spherical power thereafter. In this specification, unless otherwise specified, the "cross section" passes through the optical center O.

[0078] To obtain the plot, optical design and analysis software using ray tracing (Zemax OpticStudio: manufactured by Zemax, LLC) may be used. The aperture diameter may be set to 8.0 mm and the wavelength of light to 550 nm. Hereafter, unless otherwise specified, examples using these settings will be given.

[0079] In this embodiment, the power distribution of the optical unit consists of a far-field power mass and a near-field power mass. In this specification, frequencies greater than or equal to the value obtained by adding half the input frequency to the far-field frequency are defined as the near-field power mass, and all others are defined as the far-field power mass. The far-field power mass is mainly generated by the far-field unit, and the near-field power mass is mainly generated by the near-field unit. Therefore, the far-field power mass is said to belong to the far-field unit, and the near-field power mass is said to belong to the near-field unit. The power mass may also be called a power belt.

[0080] One example of how to determine the above ratio X1 is as follows. First, the power distribution of the optical part is obtained. That is, the above plot, with the horizontal axis being the distance from the optical center O and the vertical axis being the spherical power of the lens, is obtained for part A within the assumed entrance pupil diameter. Then, in the above plot, the value obtained by adding half the add power to the distance power is used as the threshold, and the ratio of the area NA between the plot considered to be the near power group and the horizontal axis to the area FA between the part considered to be the distance power group and the horizontal axis is X1.

[0081] The above definition of area NA is, when the outer optical section is the distance-focusing section, the area between the horizontal line with the minimum frequency in section A and the plot considered to be the near-focusing power group; and when the outer optical section is the near-focusing section, the area between the horizontal line with the maximum frequency in section A and the plot considered to be the near-focusing power group.

[0082] The above definition of area FA is, when the outer optical section is the distance-vision section, the area between the horizontal line with the minimum frequency in section A and the plot considered to be the distance-vision power group; and when the outer optical section is the near-vision section, the area between the horizontal line with the maximum frequency in section A and the plot considered to be the distance-vision power group.

[0083] The ratio Y1 is obtained using the same method as the ratio X1. Note that the above ratios X1 and Y1 may be expressed as NA:FA, NA / FA, or FA / NA.

[0084] Furthermore, the above ratio X1 may be expressed as the ratio of the horizontal axis distance of NA to the horizontal axis distance of FA.

[0085] In this specification, "the above ratio X1 and the above ratio Y1 differ" means that they differ in accordance with at least one of the above definitions.

[0086] There are no limitations on the specific configuration of the optical unit that causes the above ratio X1 and ratio Y1 to differ. Specific examples are given below.

[0087] In this specification, "ratio X1 and ratio Y1 are different" means that the power distribution of part A and the power distribution of part B are not identical in shape. Specifically, it means that the power distribution of at least one of the outer optical part (the far-field part in this example) and the intermediate part of the power distribution are not identical in shape.

[0088] In this specification, "ratio X1 and ratio Y1 are different" can also be expressed more specifically as follows: "One of the following conditions must be met." (Condition 1) Within the assumed entrance pupil diameter, the width of the distance vision portion when viewed in the X direction is different from the width of the distance vision portion when viewed in the Y direction. (Condition 2) The width of the far-field portion when viewed in the X direction is the same as the width of the far-field portion when viewed in the Y direction, while the band-shaped region of the ring in the intermediate part has a wide portion and a narrow portion. (Condition 3) The width of the distance-vision portion when viewed in the X direction is the same as the width of the distance-vision portion when viewed in the Y direction, and the width of the band-shaped region of the intermediate ring is constant, while the behavior of the change in frequency when at least the intermediate portion is viewed radially is different in the X direction and the Y direction. Conditions 1 to 3 above correspond to specific examples 1 to 3, respectively. Furthermore, while satisfying condition 1, the band-shaped region of the intermediate ring may also satisfy at least one of the following conditions: the intermediate ring has a wide portion and a narrow portion, and the behavior of the change in frequency when viewed radially in the intermediate portion differs between the X and Y directions.

[0089] In any specific example, the central optical section, either the near-vision or far-vision section, performs its optical function, and the intermediate section suppresses the generation of multiple images, while simultaneously making it easier to secure the far-vision power group belonging to the far-vision side of the outer optical section, or the near-vision power group belonging to the near-vision side of the outer optical section.

[0090] A common provision in all specific examples is that the area of ​​the near-use portion in plan view is 3.14 mm². 2 The above may also apply, and the near-vision portion has an area of ​​3.14 mm² centered on the optical center O. 2 The above circles may be included. The above area values ​​are specified considering the preference for ensuring a diameter of 2 mm for the central optical section (near-vision section in this example). However, as shown in the later examples, the area is 2.50 mm. 2 It may be greater than or equal to 2.75 mm 2 It may be greater than or equal to 3.00 mm 2 That's fine too.

[0091] A common rule in all specific examples is that it is preferable if the outer edge of the intermediate section fits within the frame of a circle with a diameter of 4.5 mm, as this allows for a wider distance-focusing section outside the intermediate section. The outer edge of the intermediate section may also fit within a circle with a diameter of 4.0 mm. As for the size of the inner edge of the intermediate section, i.e., the outer edge of the near-focusing section, there are no limitations as long as the near-focusing section can adequately perform its function, but for example, it is sufficient if the outer edge of the near-focusing section is large enough to encompass a circle with a diameter of 2.5 mm (or 3.0 mm).

[0092] The upper limit of the size of the central optical section (near vision section in this example) can be adjusted as appropriate to suit the wearer, but a moderate size is preferable from the standpoint of ensuring sufficient space for the outer optical section (distance vision section in this example). For example, the central optical section may be small enough to be contained within a circle with a diameter of 2.5 mm.

[0093] Furthermore, it is sufficient that the ratio X1 and the ratio Y1 are different when the rotation angle in the X direction is a predetermined value. In this case, if the ratio of the far-field power group is smallest in ratio X1, then the ratio of the far-field power group in ratio Y1 will always be larger than X1, at least compared to the case of a perfect circle in Figure 1 (where the ratio X1 is constant at each rotation angle). On the other hand, the larger the proportion of the region in the optical part where the ratio X1 and the ratio Y1 are different, the more pronounced the effect of this embodiment becomes. The rotation angle from the optical center O may be used to indicate this proportion. Whether or not the region where the ratio X1 and the ratio Y1 are different is different may be changed for each range of rotation angles. In that case, the region will be fan-shaped.

[0094] A larger range of rotation angles is preferable because it provides a wider fan-shaped region, and consequently, a wider area of ​​the configuration of this embodiment. For example, when viewed radially from the optical center O, it is preferable that the range of rotation angles comprising the configuration of this embodiment totals 180° or more (50% or more of the total area of ​​the optical part), 210° or more (58% or more of the total area of ​​the optical part), 240° or more (67% or more of the total area of ​​the optical part), 270° or more (75% or more of the total area of ​​the optical part), 300° or more (83% or more of the total area of ​​the optical part), 330° or more (92% or more of the total area of ​​the optical part), or 360° (i.e., the whole) (100% of the total area of ​​the optical part).

[0095] Although this embodiment has been described above in terms of power distribution, it is also possible to define this embodiment by the shape (curvature) of the front surface instead of the power distribution. This is because, in conventional lenses, the surface that contacts the cornea (posterior surface) must have a shape that conforms to the shape of the cornea (for example, a spherical or toric surface). In that case, the power adjustment must be made by the shape of the surface on the eyelid side (anterior surface). In fact, the power distribution mentioned in this specification is obtained by making the posterior surface spherical and adjusting the shape of the anterior surface. As a result, the characteristics of the frequency plot can also be represented by the shape (curvature) of the front surface of the lens. Incidentally, when specifying values ​​in degrees, a preferred example can also be applied to the case where the radius of curvature is used, by appropriately converting the degrees to the radius of curvature.

[0096] 1-5. Other Contact Lenses Although a multifocal contact lens was used as an example in this embodiment, the technical concept of the present invention can also be applied to other types of contact lenses.

[0097] For example, even with multifocal toric contact lenses, the toric shape does not hinder the aforementioned behavior of the power. This is because toric contact lenses have a uniform curvature difference (difference in curvature between the radial and circumferential directions) on one surface of the lens, and there is no impediment to making the circumferential curvature approach the radial curvature in the intermediate portion, as described in the findings of the present invention. Therefore, the technical concept of the present invention can be applied even to toric contact lenses.

[0098] The lens of this embodiment, which includes the parts described above, can be used for both soft and hard contact lenses. However, a soft contact lens, which hardly moves on the cornea, is preferable in that it provides sufficient optical performance and customer satisfaction to the wearer.

[0099] Furthermore, the lens of this embodiment may be provided with a myopia progression suppression effect. This lens will be referred to as a myopia progression suppression lens. The myopia progression suppression effect is achieved by converging the light entering the eyeball in front of the retina (towards the object when viewed from the retina).

[0100] This myopia progression suppression effect can be achieved, for example, with a lens designed for central distance vision. Specifically, the central distance vision portion may have a shape that reflects the prescription values, while the outer edge of the lens, flanked by the intermediate portion, may have a near vision portion with a higher power than the distance vision portion (focusing light in front of the retina).

[0101] Conversely, this myopia progression suppression effect can also be achieved with lenses designed for near vision at the center. Specifically, the near vision portion in the center focuses light in front of the retina, while the outer edge of the lens, separated by the intermediate portion, may have a distance vision portion with a lower power than the near vision portion, i.e., a shape that reflects the prescription value.

[0102] In other words, in the case of a lens equipped with a myopia progression suppression effect, the effect of the present invention is achieved if the shape of any of the concentrically arranged regions within the lens reflects the wearer's prescription. The distance and near vision regions (especially the near vision region) near the center and outer edge when viewed from the annular middle portion of this embodiment do not necessarily have to reflect the wearer's prescription. In this specification, "near vision power corresponding to near distance" includes the previously used expression "near vision power for viewing near distances," that is, the power corresponding to the wearer's prescription, as well as powers that focus light in front of the retina. To avoid misunderstanding, it may also be called "power corresponding to near distance."

[0103] As a result of the above, according to each example of this embodiment, when viewing from the center to the periphery of the lens, it is possible to quickly reduce the cylinder power generated in the intermediate part, reduce the cylinder power in the far-field or near-field at the outer edge of the intermediate part, and consequently, secure a wide area with low cylinder power in the far-field or near-field at the outer edge of the intermediate part.

[0104] <2. Contact Lens Design Method (Manufacturing Method)> The above principles are also fully applicable to the design and manufacturing methods of contact lenses. For example, the design method would consist of the following components. An ophthalmic lens comprising: a near-vision portion having a near-vision power corresponding to near distances; a far-vision portion having a far-vision power corresponding to distances greater than near distances; and an annular intermediate portion connecting the near-vision portion and the far-vision portion, wherein the central optical portion, which is either the near-vision portion or the far-vision portion, is positioned in the center, and the outer optical portion, which is either the far-vision portion or the near-vision portion and is not positioned in the center, is arranged annularly around the outer edge of the intermediate portion, and the lens has a front surface positioned on the object side and a rear surface facing the front surface, The aforementioned front surface is a composite surface of a progressive surface and a toric surface. A method for designing an eye lens in which the cylinder power of the near-vision section and the cylinder power of the far-vision section are made equal.

[0105] Regarding specific design methods, it is sufficient to use known lens design methods and design equipment. Furthermore, the distinctions described in <1. Contact Lenses> (cases where the near vision portion is located in the center and cases where the far vision portion is located) and each preferred example are applicable to this section, and since this would be redundant with the description in <1. Contact Lenses>, the description is omitted here.

[0106] When modifying the design so that the outer edge of the intermediate section is deformed from a perfect circle to an ellipse in plan view, the decrease in the length of the minor axis of the ellipse from the radius of the perfect circle may be greater than the increase in the length of the major axis of the ellipse from the radius of the perfect circle. This ensures that the area of ​​the far-field section is significantly larger than when it is a perfect circle.

[0107] Furthermore, regarding the manufacturing method, it comprises a design step of designing an ophthalmic lens using the above-described ophthalmic lens design method (combining each preferred example as appropriate in some cases), and a processing step of manufacturing the designed ophthalmic lens using a processing device. Regarding the specific processing method, it is sufficient to use a known lens processing device. The specific method can be an application of a known method. For example, the contents described in WO02 / 048779 (Japanese Patent No. 5031808) may be applied.

[0108] <3. Intraocular lenses (IOLs) and their design methods (manufacturing methods)> The technical concept of the present invention is also fully applicable to intraocular lenses (IOLs) and their design methods (manufacturing methods). There are no particular limitations on the type of intraocular lens, and it can be applied to intraocular lenses that are placed inside the lens capsule (in-the-bag), intraocular lenses that are placed outside the capsule (out-the-bag), and suturing-type intraocular lenses, etc.

[0109] When applying the technical concept of the present invention to an intraocular lens, it is sufficient to have at least an optical section. As described in <1-1. Multifocal Contact Lenses>, an annular peripheral section may be provided around the periphery of the optical section, which primarily contributes to optical performance. However, the intraocular lens in this example consists of an optical section and a support section that supports the optical section within the lens capsule. A relatively common case is when the intraocular lens comprises the above-mentioned optical section and a support section extending from the optical section. The shape of the support section may be that of a known intraocular lens, but for example, two support sections extending from the optical section in an arm-like manner may be provided on the optical section, and this may also be used as the intraocular lens.

[0110] Regarding the design (manufacturing) method of intraocular lenses, the design of the optical part is the same as described in <2. Design (manufacturing) method of contact lenses>, so it will be omitted here. As for the specific design (manufacturing) method, it is sufficient to design using known intraocular lens design methods (processing equipment). Also, the distinctions described in <1. Contact Lenses> (cases where the near vision portion is located in the center and cases where the far vision portion is located) and each preferred example are applicable to this section, and since it would be redundant with the description in <1. Contact Lenses>, it will be omitted here.

[0111] <4. Eye Lens Set> The above information is also fully applicable to contact lens sets comprising multiple contact lenses as illustrated in this embodiment, and to intraocular lens sets comprising multiple intraocular lenses as illustrated in this embodiment. These lens sets are collectively referred to as "ophthalmic lens sets."

[0112] When selling contact lenses as a product, it's not just about selling a single contact lens; it's common to bundle multiple contact lenses with various powers and base curves (e.g., multiple contact lenses with the same base curve but different powers) and sell them under a single product name.

[0113] Therefore, the technical concept of the present invention is fully reflected in the ophthalmic lens set, which includes multiple lenses exhibiting the same power behavior as the contact lenses (or intraocular lenses, etc.) of this embodiment described in detail earlier. From a different perspective, all ophthalmic lens sets constituting the ophthalmic lens set in this embodiment exhibit the power behavior described above. This means that even if one ophthalmic lens exhibiting the above power behavior is manufactured in the prior art, this coincidentally manufactured ophthalmic lens is completely different in structure from the ophthalmic lens set in this embodiment.

[0114] The configuration of an ophthalmic lens set comprising multiple of the above-mentioned ophthalmic lenses is as follows. Note that the preferred examples mentioned earlier may be appropriately combined with the following configuration.

[0115] An ophthalmic lens set comprising a plurality of ophthalmic lenses, each having a near-vision portion with near-vision power corresponding to near distances, a far-vision portion with far-vision power corresponding to distances greater than near distances, and an annular intermediate portion connecting the near-vision portion and the far-vision portion, wherein the central optical portion, which is either the near-vision portion or the far-vision portion, is positioned in the center, and the outer optical portion, which is either the far-vision portion or the near-vision portion and is not positioned in the center, is arranged annularly around the outer edge of the intermediate portion, and each optical portion has a front surface positioned on the object side and a rear surface facing the front surface, The aforementioned front surface is a composite surface of a progressive surface and a toric surface. An eye lens set in which the cylinder power of the near-vision section and the cylinder power of the far-vision section are equal.

[0116] <5. Variation> The present invention is not limited to the above examples, and the above examples and preferred examples may be combined as appropriate.

[0117] For example, the "central optical section" may be the distance vision section and the "outer optical section" may be the near vision section. In that case, the present invention can be applied by swapping the near vision section and the distance vision section in the above text, and by changing the expression of the high and low power levels accordingly. For other matters, the content described in this embodiment can be used by reference. [Examples]

[0118] The present invention will be described in detail below using examples, but the present invention is not limited in any way by the following examples.

[0119] <Example 1> This embodiment is a lens to which Preferred Example 2 is applied. In this embodiment, the base curve (BC) is set to 8.50, the distance power (spherical power) S is -5.00D, the near power (S+ADD) is -3.00D, and the astigmatism power C is -1.50D. In other words, the add power ADD is +2.00D. In this specification, "add power" refers to the value obtained by subtracting the distance power from the near power. The center thickness (CT) of the lens is 0.10 mm, and the refractive index (n) of the lens is 1.44. The same applies hereafter unless otherwise specified.

[0120] Figure 4 is a schematic plan view of the ophthalmic lens of Example 1, showing the schematic power distribution in the X-direction cross-section (bottom figure) and the schematic power distribution in the Y-direction cross-section (right figure). In both power distributions, the vertical axis is power (D) and the horizontal axis is distance from the optical center (mm). In this specification, the power distribution of astigmatism is referred to as the cylindrical power distribution. The expression "power distribution" simply refers to the power distribution of spherical power. Figure 5 is a schematic diagram showing the surface height (sag value) in the circumferential direction centered on the optical center O in the ophthalmic lens of Example 1, where the horizontal axis represents the rotation angle (unit: °) and the vertical axis (downward) represents the sag value. Figure 6 shows the power distribution of the ophthalmic lens of Example 1 in a planar view. Figure 7 shows the tangential power distribution in the Y-direction cross-section of the ophthalmic lens of Example 1. Figure 8 shows the sagittal power distribution in the Y-direction cross-section of the ophthalmic lens of Example 1. Figure 9 shows the cylinder power distribution of the ophthalmic lens of Example 1 in a plan view. Figure 10 shows the cylinder power distribution in the Y-direction cross-section of the ophthalmic lens of Example 1. In this specification, the scale in the power distribution is such that +1 represents +4.0 mm and -1 represents -4.0 mm. The distance in the X direction from the lens center is also called the X-pupil, and the distance in the Y direction from the lens center is also called the Y-pupil.

[0121] <Example 2> Figure 11 shows the power distribution of the ophthalmic lens of Example 2 in a planar view. Figure 12 shows the tangential power distribution in the Y-direction cross-section of the ophthalmic lens of Example 2. Figure 13 shows the sagittal power distribution in the Y-direction cross-section of the ophthalmic lens of Example 2. Figure 14 shows the cylinder power distribution of the ophthalmic lens of Example 2 in a plan view. Figure 15 shows the cylinder power distribution in the Y-direction cross-section of the ophthalmic lens of Example 2.

[0122] In this embodiment, S was set to -3.00D, and the (cylinder) power distribution was as shown in Figures 10 to 14, otherwise the procedure was the same as in Embodiment 1. [Explanation of symbols]

[0123] 10……Near part 20……Distance part 30...Middle section 4……Optical department 5…Peripheral area 6… Multifocal contact lenses

Claims

1. An ophthalmic lens comprising: a near-vision portion having a near-vision power corresponding to near distances; a far-vision portion having a far-vision power corresponding to distances greater than near distances; and an annular intermediate portion connecting the near-vision portion and the far-vision portion, wherein the central optical portion, which is either the near-vision portion or the far-vision portion, is positioned in the center, and the outer optical portion, which is either the far-vision portion or the near-vision portion and is not positioned in the center, is arranged annularly around the outer edge of the intermediate portion, and further comprising an optical portion having a front surface positioned on the object side and a rear surface facing the front surface, The aforementioned front surface is a composite surface of a progressive surface and a toric surface. In the aforementioned intermediate portion, when viewed in the X direction, which is the direction from the optical center O toward the periphery, there is a portion A1 arranged in an annular shape around the outer edge of the intermediate portion, which has a power that is stronger than or weaker than the distance power of the distance portion or the near power of the near power portion, and when viewed in the X' direction, which is the direction directly opposite to the X direction and is the direction from the optical center O toward the periphery, there is also a portion A1' arranged in an annular shape around the outer edge of the intermediate portion, which has a power that is stronger than or weaker than the distance power of the distance portion or the near power of the near power portion, and, In the aforementioned intermediate portion, when viewed in the Y direction, which is perpendicular to the X direction, there is a portion B1 arranged in an annular shape around the outer edge of the intermediate portion, which has a power that is stronger than or weaker than the distance power of the distance portion or the near power of the near power portion, and when viewed in the Y' direction, which is directly opposite to the Y direction and extends from the optical center O toward the periphery, there is also a portion B1' arranged in an annular shape around the outer edge of the intermediate portion, which has a power that is stronger than or weaker than the distance power of the distance portion or the near power of the near power portion, The composite surface is shaped to provide cylinder power that cancels out the astigmatism generated in the outer optical section. An eye lens in which the cylinder power of the near-vision section is equal to the astigmatism correction power set in the near-vision section, and the cylinder power of the far-vision section is equal to the astigmatism correction power set in the far-vision section.

2. An ophthalmic lens having a near-vision portion having a near-vision power corresponding to near distances, a far-vision portion having a far-vision power corresponding to distances greater than near distances, and an annular intermediate portion connecting the near-vision portion and the far-vision portion, wherein the central optical portion which is the near-vision portion or the far-vision portion is located in the center, and the outer optical portion which is the far-vision portion or the near-vision portion not located in the center is arranged annularly around the outer edge of the intermediate portion, and having a front surface located on the object side and a rear surface facing the front surface, The aforementioned front surface is a composite surface of a progressive surface and a toric surface. In the aforementioned central optical section, when viewed in the X direction, which is the direction from the optical center O toward the periphery, there is a portion A2 in which the intensity is increased and then weakened, and when viewed in the X' direction, which is the direction directly opposite to the X direction and is the direction from the optical center O toward the periphery, there is also a portion A2' in which the intensity is increased and then weakened, and In the central optical section, when viewed in the Y direction, which is perpendicular to the X direction, there is a portion B2 in which the intensity is increased and then weakened, and when viewed in the Y' direction, which is directly opposite to the Y direction and extends from the optical center O toward the periphery, there is also a portion B2' in which the intensity is increased and then weakened. The composite surface is shaped to provide cylinder power that cancels out the astigmatism generated in the outer optical section. An eye lens in which the cylinder power of the near-vision section is equal to the astigmatism correction power set in the near-vision section, and the cylinder power of the far-vision section is equal to the astigmatism correction power set in the far-vision section.

3. An ophthalmic lens having a near-vision portion having a near-vision power corresponding to near distances, a far-vision portion having a far-vision power corresponding to distances greater than near distances, and an annular intermediate portion connecting the near-vision portion and the far-vision portion, wherein the central optical portion which is the near-vision portion or the far-vision portion is located in the center, and the outer optical portion which is the far-vision portion or the near-vision portion not located in the center is arranged annularly around the outer edge of the intermediate portion, and having a front surface which is located on the object side and a rear surface which is located opposite the front surface, The aforementioned front surface is a composite surface of a progressive surface and a toric surface. By satisfying one of the following conditions, the composite surface is given a shape that provides cylinder power to cancel out the astigmatism generated in the outer optical section, An eye lens in which the cylinder power of the near-vision section is equal to the astigmatism correction power set in the near-vision section, and the cylinder power of the far-vision section is equal to the astigmatism correction power set in the far-vision section. (Condition 1) Within an assumed entrance pupil diameter of 4.0 to 5.0 mm, the width of the distance-focusing portion when viewed in the X direction, which is the direction from the optical center O toward the periphery, is different from the width of the distance-focusing portion when viewed in the Y direction, which is the direction perpendicular to the X direction. (Condition 2) Within the assumed entrance pupil diameter of 4.0 to 5.0 mm, the width of the distance-vision portion when viewed in the X direction is the same as the width of the distance-vision portion when viewed in the Y direction, while the band-shaped region of the intermediate ring has a wide portion and a narrow portion. (Condition 3) Within the assumed entrance pupil diameter of 4.0 to 5.0 mm, the width of the distance vision portion when viewed in the X direction is the same as the width of the distance vision portion when viewed in the Y direction, and the width of the band-shaped region of the intermediate ring is constant, while the behavior of the change in power when the intermediate portion is viewed radially is different in the X direction and the Y direction.

4. The ophthalmic lens according to any one of claims 1 to 3, wherein the cylinder power of the near-vision section and the cylinder power of the far-vision section are equal.

5. The ophthalmic lens according to any one of claims 1 to 4, wherein the ophthalmic lens is a contact lens.

6. The ophthalmic lens according to any one of claims 1 to 4, wherein the ophthalmic lens is an intraocular lens.

7. An ophthalmic lens comprising: a near-vision portion having a near-vision power corresponding to near distances; a far-vision portion having a far-vision power corresponding to distances greater than near distances; and an annular intermediate portion connecting the near-vision portion and the far-vision portion, wherein the central optical portion, which is either the near-vision portion or the far-vision portion, is positioned in the center, and the outer optical portion, which is either the far-vision portion or the near-vision portion and is not positioned in the center, is arranged annularly around the outer edge of the intermediate portion, and further comprising an optical portion having a front surface positioned on the object side and a rear surface facing the front surface, The aforementioned front surface is a composite surface of a progressive surface and a toric surface. In the aforementioned intermediate portion, when viewed in the X direction, which is the direction from the optical center O toward the periphery, there is a portion A1 arranged in an annular shape around the outer edge of the intermediate portion, which has a power that is stronger than or weaker than the distance power of the distance portion or the near power of the near power portion, and when viewed in the X' direction, which is the direction directly opposite to the X direction and is the direction from the optical center O toward the periphery, there is also a portion A1' arranged in an annular shape around the outer edge of the intermediate portion, which has a power that is stronger than or weaker than the distance power of the distance portion or the near power of the near power portion, and, In the aforementioned intermediate portion, when viewed in the Y direction, which is perpendicular to the X direction, there is a portion B1 arranged in an annular shape around the outer edge of the intermediate portion, which has a power that is stronger than or weaker than the distance power of the distance portion or the near power of the near power portion, and when viewed in the Y' direction, which is directly opposite to the Y direction and extends from the optical center O toward the periphery, there is also a portion B1' arranged in an annular shape around the outer edge of the intermediate portion, which has a power that is stronger than or weaker than the distance power of the distance portion or the near power of the near power portion, The composite surface is shaped to provide cylinder power that cancels out the astigmatism generated in the outer optical section. A method for designing an eye lens, wherein the cylinder power of the near-vision section is equal to the astigmatism correction power set in the near-vision section, and the cylinder power of the far-vision section is equal to the astigmatism correction power set in the far-vision section.

8. An ophthalmic lens comprising: a near-vision portion having a near-vision power corresponding to near distances; a far-vision portion having a far-vision power corresponding to distances greater than near distances; and an annular intermediate portion connecting the near-vision portion and the far-vision portion, wherein the central optical portion, which is the near-vision portion or the far-vision portion, is located in the center, and the outer optical portion, which is the far-vision portion or the near-vision portion that is not located in the center, is arranged annularly around the outer edge of the intermediate portion, and the lens comprises a front surface located on the object side and a rear surface facing the front surface, The aforementioned front surface is a composite surface of a progressive surface and a toric surface. In the aforementioned central optical section, when viewed in the X direction, which is the direction from the optical center O toward the periphery, there is a portion A2 in which the intensity is increased and then weakened, and when viewed in the X' direction, which is the direction directly opposite to the X direction and is the direction from the optical center O toward the periphery, there is also a portion A2' in which the intensity is increased and then weakened, and In the central optical section, when viewed in the Y direction, which is perpendicular to the X direction, there is a portion B2 in which the intensity is increased and then weakened, and when viewed in the Y' direction, which is directly opposite to the Y direction and extends from the optical center O toward the periphery, there is also a portion B2' in which the intensity is increased and then weakened. The composite surface is shaped to provide cylinder power that cancels out the astigmatism generated in the outer optical section. A method for designing an eye lens, wherein the cylinder power of the near-vision section is equal to the astigmatism correction power set in the near-vision section, and the cylinder power of the far-vision section is equal to the astigmatism correction power set in the far-vision section.

9. An ophthalmic lens comprising: a near-vision portion having a near-vision power corresponding to near distances; a far-vision portion having a far-vision power corresponding to distances greater than near distances; and an annular intermediate portion connecting the near-vision portion and the far-vision portion, wherein the central optical portion, which is the near-vision portion or the far-vision portion, is positioned in the center, and the outer optical portion, which is the far-vision portion or the near-vision portion not positioned in the center, is positioned annularly on the outer edge of the intermediate portion, and the lens having a front surface positioned on the object side and a rear surface facing the front surface, The aforementioned front surface is a composite surface of a progressive surface and a toric surface. By satisfying one of the following conditions, the composite surface is given a shape that provides cylinder power to cancel out the astigmatism generated in the outer optical section, A method for designing an eye lens, wherein the cylinder power of the near-vision section is equal to the astigmatism correction power set in the near-vision section, and the cylinder power of the far-vision section is equal to the astigmatism correction power set in the far-vision section. (Condition 1) Within an assumed entrance pupil diameter of 4.0 to 5.0 mm, the width of the distance-focusing portion when viewed in the X direction, which is the direction from the optical center O toward the periphery, is different from the width of the distance-focusing portion when viewed in the Y direction, which is the direction perpendicular to the X direction. (Condition 2) Within the assumed entrance pupil diameter of 4.0 to 5.0 mm, the width of the distance-vision portion when viewed in the X direction is the same as the width of the distance-vision portion when viewed in the Y direction, while the band-shaped region of the intermediate ring has a wide portion and a narrow portion. (Condition 3) Within the assumed entrance pupil diameter of 4.0 to 5.0 mm, the width of the distance vision portion when viewed in the X direction is the same as the width of the distance vision portion when viewed in the Y direction, and the width of the band-shaped region of the intermediate ring is constant, while the behavior of the change in power when the intermediate portion is viewed radially is different in the X direction and the Y direction.

10. A method for designing an ophthalmic lens according to any one of claims 7 to 9, wherein the cylinder power of the near-vision section and the cylinder power of the far-vision section are equal.

11. The method for designing an ophthalmic lens according to any one of claims 7 to 10, wherein the ophthalmic lens is a contact lens.

12. The method for designing an ophthalmic lens according to any one of claims 7 to 10, wherein the ophthalmic lens is an intraocular lens.

13. A design step of designing an ophthalmic lens by the ophthalmic lens design method described in any one of claims 7 to 12, The manufacturing process involves producing the designed ophthalmic lens using processing equipment, A method for manufacturing an ophthalmic lens having [a certain characteristic].

14. An ophthalmic lens set comprising a plurality of ophthalmic lenses, each having a near-vision portion with near-vision power corresponding to near distances, a far-vision portion with far-vision power corresponding to distances greater than near distances, and an annular intermediate portion connecting the near-vision portion and the far-vision portion, wherein the central optical portion, which is either the near-vision portion or the far-vision portion, is positioned in the center, and the outer optical portion, which is either the far-vision portion or the near-vision portion and is not positioned in the center, is arranged annularly around the outer edge of the intermediate portion, and each optical portion has a front surface positioned toward the object and a rear surface facing the front surface, The aforementioned front surface is a composite surface of a progressive surface and a toric surface. In the aforementioned intermediate portion, when viewed in the X direction, which is the direction from the optical center O toward the periphery, there is a portion A1 arranged in an annular shape around the outer edge of the intermediate portion, which has a power that is stronger than or weaker than the distance power of the distance portion or the near power of the near power portion, and when viewed in the X' direction, which is the direction directly opposite to the X direction and is the direction from the optical center O toward the periphery, there is also a portion A1' arranged in an annular shape around the outer edge of the intermediate portion, which has a power that is stronger than or weaker than the distance power of the distance portion or the near power of the near power portion, and, In the aforementioned intermediate portion, when viewed in the Y direction, which is perpendicular to the X direction, there is a portion B1 arranged in an annular shape around the outer edge of the intermediate portion, which has a power that is stronger than or weaker than the distance power of the distance portion or the near power of the near power portion, and when viewed in the Y' direction, which is directly opposite to the Y direction and extends from the optical center O toward the periphery, there is also a portion B1' arranged in an annular shape around the outer edge of the intermediate portion, which has a power that is stronger than or weaker than the distance power of the distance portion or the near power of the near power portion, The composite surface is shaped to provide cylinder power that cancels out the astigmatism generated in the outer optical section. An eye lens set in which the cylinder power of the near-vision section is equal to the astigmatism correction power set in the near-vision section, and the cylinder power of the far-vision section is equal to the astigmatism correction power set in the far-vision section.

15. An ophthalmic lens set comprising a plurality of ophthalmic lenses, each having a near-vision portion with a near-vision power corresponding to near distances, a far-vision portion with a far-vision power corresponding to distances greater than near distances, and an annular intermediate portion connecting the near-vision portion and the far-vision portion, wherein the central optical portion, which is the near-vision portion or the far-vision portion, is positioned in the center, and the outer optical portion, which is the far-vision portion or the near-vision portion that is not positioned in the center, is positioned annularly on the outer edge of the intermediate portion, and each optical portion has a front surface positioned on the object side and a rear surface facing the front surface, The aforementioned front surface is a composite surface of a progressive surface and a toric surface. In the aforementioned central optical section, when viewed in the X direction, which is the direction from the optical center O toward the periphery, there is a portion A2 in which the intensity is increased and then weakened, and when viewed in the X' direction, which is the direction directly opposite to the X direction and is the direction from the optical center O toward the periphery, there is also a portion A2' in which the intensity is increased and then weakened, and In the central optical section, when viewed in the Y direction, which is perpendicular to the X direction, there is a portion B2 in which the intensity is increased and then weakened, and when viewed in the Y' direction, which is directly opposite to the Y direction and extends from the optical center O toward the periphery, there is also a portion B2' in which the intensity is increased and then weakened. The composite surface is shaped to provide cylinder power that cancels out the astigmatism generated in the outer optical section. An eye lens set in which the cylinder power of the near-vision section is equal to the astigmatism correction power set in the near-vision section, and the cylinder power of the far-vision section is equal to the astigmatism correction power set in the far-vision section.

16. An ophthalmic lens set comprising a plurality of ophthalmic lenses, each having a near-vision portion with near-vision power corresponding to near distances, a far-vision portion with far-vision power corresponding to distances greater than near distances, and an annular intermediate portion connecting the near-vision portion and the far-vision portion, wherein the central optical portion, which is the near-vision portion or the far-vision portion, is positioned in the center, and the outer optical portion, which is the far-vision portion or the near-vision portion that is not positioned in the center, is arranged annularly around the outer edge of the intermediate portion, and each optical portion has a front surface positioned toward the object and a rear surface facing the front surface, The aforementioned front surface is a composite surface of a progressive surface and a toric surface. By satisfying one of the following conditions, the composite surface is given a shape that provides cylinder power to cancel out the astigmatism generated in the outer optical section, An eye lens set in which the cylinder power of the near-vision section is equal to the astigmatism correction power set in the near-vision section, and the cylinder power of the far-vision section is equal to the astigmatism correction power set in the far-vision section. (Condition 1) Within an assumed entrance pupil diameter of 4.0 to 5.0 mm, the width of the distance-focusing portion when viewed in the X direction, which is the direction from the optical center O toward the periphery, is different from the width of the distance-focusing portion when viewed in the Y direction, which is the direction perpendicular to the X direction. (Condition 2) Within the assumed entrance pupil diameter of 4.0 to 5.0 mm, the width of the distance-vision portion when viewed in the X direction is the same as the width of the distance-vision portion when viewed in the Y direction, while the band-shaped region of the intermediate ring has a wide portion and a narrow portion. (Condition 3) Within the assumed entrance pupil diameter of 4.0 to 5.0 mm, the width of the distance vision portion when viewed in the X direction is the same as the width of the distance vision portion when viewed in the Y direction, and the width of the band-shaped region of the intermediate ring is constant, while the behavior of the change in power when the intermediate portion is viewed radially is different in the X direction and the Y direction.

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