Ophthalmic lens
Patent Information
- Application Number
- KR1020260014940
- Authority / Receiving Office
- KR · KR
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-02-25
- Filing Date
- 2026-01-26
- Publication Date
- 2026-09-01
Smart Images
Figure PAT00124_ABST
Abstract
Description
Technology Field
[0001] The present invention relates to ophthalmic lenses, and more particularly to multifocal ophthalmic lenses. Background Technology
[0002] With the widespread adoption of 3C products, the incidence of myopia among children and adolescents is showing a trend toward younger ages. Consequently, the proportion of patients with high myopia is significantly increasing, and vision problems are not limited to myopia and hyperopia but are often accompanied by symptoms of astigmatism. When light passes through the cornea and focuses normally on the retina, it can form a clear image. However, if light fails to focus at a single focal point and forms multiple focal points, astigmatism occurs. This causes problems such as image distortion, image damage, and blurring in both distant and near vision, severely affecting the quality of vision.
[0003] The primary traditional method for correcting visual deviation is wearing ophthalmic lenses, such as contact lenses. The refractive power design of conventional multifocal ophthalmic lenses typically adopts a method of gradually increasing power from the central zone to the outer zone. This pattern of power change often causes discomfort to the wearer and is difficult to endure, particularly during prolonged use, which can actually hinder the effectiveness of visual control. The problem to be solved
[0004] In light of this, the objective of the present invention is to provide an ophthalmic lens that offers a multifocal diopter design and allows the refractive arrangement to be arbitrarily changed according to vision correction requirements, thereby providing an effect that reduces visual fatigue and results in a clearer and more comfortable effect when worn. means of solving the problem
[0005] To achieve the above objective, the ophthalmic lens provided in the present invention comprises a central optical zone, a first outer ring optical zone, a second outer ring optical zone, and a third outer ring optical zone; the first outer ring optical zone surrounds the periphery of the central optical zone; the second outer ring optical zone surrounds the periphery of the first outer ring optical zone; and the third outer ring optical zone surrounds the periphery of the second outer ring optical zone. The ophthalmic lens has two first refractive correction regions, one second refractive correction region, and one third refractive correction region defined, and the two first refractive correction regions, the second refractive correction region, and the third refractive correction region are arbitrarily positioned in the central optical zone, the first outer ring optical zone, the second outer ring optical zone, and the third outer ring optical zone, and the ophthalmic lens has a refractive power distribution curve, each of the first refractive correction regions represents a horizontal straight line in the refractive power distribution curve, the second refractive correction region and the third refractive correction region each represent a waveform in the refractive power distribution curve, and the second refractive correction region and the third refractive correction region each have at least one peak; the ophthalmic lens has the following range: 3.5mm Z1+Z2+Z3+Z4 5.0 mm is satisfied, and Z1 is the interval in which the central optical zone extends from the center point to the boundary of the central optical zone; Z2 is the interval in which the first outer ring optical zone extends from the boundary of the central optical zone to the boundary of the first outer ring optical zone; Z3 is the interval in which the second outer ring optical zone extends from the boundary of the first outer ring optical zone to the boundary of the second outer ring optical zone; and Z4 is the interval in which the third outer ring optical zone extends from the boundary of the second outer ring optical zone to the boundary of the third outer ring optical zone. Effects of the invention
[0006] The effect of the present invention is that the ophthalmic lens provides an effect of reducing visual fatigue of the wearer through the design of multifocal refractive power, thereby providing a clearer and more comfortable effect when wearing the ophthalmic lens, and the ophthalmic lens can arbitrarily distribute the two first refractive correction areas, the second refractive correction area, and the third refractive correction area to the central optical area, the first outer ring optical area, the second outer ring optical area, and the third outer ring optical area as required, and by adjusting and arranging the refractive power for each refractive correction area, the diversity of the refractive power arrangement of the ophthalmic lens is increased. Brief explanation of the drawing
[0007] The above description and other features of the present invention will be explained in detail with reference to the drawings. FIG. 1a is a schematic structural diagram of an ophthalmic lens according to preferred embodiment 1 of the present invention. FIG. 1b is a refractive power distribution curve of an ophthalmic lens of preferred embodiment 1 of the present invention. FIG. 2 is a refractive power distribution curve of an ophthalmic lens according to preferred embodiment 2 of the present invention. FIG. 3 is a refractive power distribution curve of an ophthalmic lens of preferred embodiment 3 of the present invention. Figure 4 is a refractive power distribution curve of an ophthalmic lens of preferred embodiment 4 of the present invention. FIG. 5 is a refractive power distribution curve of an ophthalmic lens of preferred embodiment 5 of the present invention. Specific details for implementing the invention
[0008] To explain the present invention more clearly, preferred embodiments are described in detail below together with the drawings. Referring to FIG. 1a and FIG. 1b, an ophthalmic lens (100) of preferred embodiment 1 of the present invention comprises a central optical zone (10), a first outer ring optical zone (20), a second outer ring optical zone (30), and a third outer ring optical zone (40). In this embodiment 1, the ophthalmic lens (100) is described as a contact lens, but is not limited thereto.
[0009] The central optical zone (10) has a center point (O), the first outer ring optical zone (20) surrounds the central optical zone (10), the second outer ring optical zone (30) surrounds the first outer ring optical zone (20), and the third outer ring optical zone (40) surrounds the second outer ring optical zone (30). In the present embodiment 1, the first outer ring optical zone (20), the second outer ring optical zone (30), and the third outer ring optical zone (40) are each installed as concentric circles with respect to the center point (O).
[0010] The ophthalmic lens (100) is defined with two first refractive correction areas (A1), one second refractive correction area (B1), and one third refractive correction area (C1), and the two first refractive correction areas (A1), the second refractive correction area (B1), and the third refractive correction area (C1) are arbitrarily placed in the central optical zone (10), the first outer ring optical zone (20), the second outer ring optical zone (30), and the third outer ring optical zone (40), which indicates that the ophthalmic lens (100) can arbitrarily adjust and place the two first refractive correction areas (A1), the second refractive correction area (B1), and the third refractive correction area (C1) in the central optical zone (10), the first outer ring optical zone (20), the second outer ring optical zone (30), and the third outer ring optical zone (40) according to the vision correction requirement, and the two first The refractive correction area (A1), the second refractive correction area (B1), and the third refractive correction area (C1) are not limited to being sequentially arranged in the central optical zone (10), the first outer ring optical zone (20), the second outer ring optical zone (30), and the third outer ring optical zone (40).
[0011] In a preferred embodiment, the two first refractive correction regions are each located in two of the central optical zone, the first outer ring optical zone, the second outer ring optical zone, and the third outer ring optical zone, and the second refractive correction region and / or the third refractive correction region are arranged between the two first refractive correction regions (A1); in another preferred embodiment, the two first refractive correction regions are arranged adjacent to two of the central optical zone, the first outer ring optical zone, the second outer ring optical zone, and the third outer ring optical zone, and the second refractive correction region or the third refractive correction region is arranged on one side of one of the two first refractive correction regions; In another preferred embodiment, the two first refractive correction regions are arranged adjacent to the first outer ring optical zone and the second outer ring optical zone, the second refractive correction region and the third refractive correction region are located in the central optical zone and the third outer ring optical zone, and the two first refractive correction regions are arranged between the second refractive region and the third refractive region; for example, the two first refractive correction regions (A1), the second refractive correction region (B1), and the third refractive correction region (C1) in the ophthalmic lens (100) may be optionally placed in the central optical zone (10), the first outer ring optical zone (20), the second outer ring optical zone (30), and the third outer ring optical zone (40) according to Table 1 below.
[0012] Table 1 is a table showing the arrangement relationship of each refractive correction area in an ophthalmic lens located in each optical zone. Optical zone array central optical zone (10) First outer ring optical zone (20) Second outer ring optical zone (30) Third outer ring optical zone (40) Arrangement relationship of corresponding optical zones in the refractive correction area First refractive correction area (A1) First refractive correction area (A1) Third refractive correction area (C1) Second refractive correction area (B1) First refractive correction area (A1) First refractive correction area (A1) Second refractive correction area (B1) Third refractive correction area (C1) First refractive correction area (A1) Third refractive correction area (C1) Second refractive correction area (B1) First refractive correction area (A1) First refractive correction area (A1) Second refractive correction area (B1) Third refractive correction area (C1) First refractive correction area (A1) First refractive correction area (A1) Second refractive correction area (B1) First refractive correction area (A1) Third refractive correction area (C1) First refractive correction area (A1) Third refractive correction area (C1) First refractive correction area (A1) Second refractive correction area (B1) Second refractive correction area (B1) First refractive correction area (A1) First refractive correction area (A1) Third refractive correction area (C1) Third refractive correction area (C1) First refractive correction area (A1) First refractive correction area (A1) Second refractive correction area (B1) Second refractive correction area (B1) First refractive correction area (A1) Third refractive correction area (C1) First refractive correction area (A1) Third refractive correction area (C1) First refractive correction area (A1) Second refractive correction area (B1) First refractive correction area (A1) Second refractive correction area (B1) Third refractive correction area (C1) First refractive correction area (A1) First refractive correction area (A1) Third refractive correction area (C1) Second refractive correction area (B1) First refractive correction area (A1) First refractive correction area (A1)
[0013] As illustrated in FIG. 1b, in Example 1, in the refractive power distribution curve of the ophthalmic lens (100), the two first refractive correction regions (A1) are arranged adjacent to the central optical zone (10) and the first outer ring optical zone (20), the second refractive correction region (B1) is located in the second outer ring optical zone (30), and the third refractive correction region (C1) is located in the third outer ring optical zone (40). Each of the first refractive correction regions (A1) represents a horizontal straight line in the refractive power distribution curve, and the second refractive correction region (B1) and the third refractive correction region (C1) each represent a continuously changing waveform in the refractive power distribution curve. The second refractive correction region (B1) and the third refractive correction region (C1) each have a plurality of peaks. Specifically, the second refractive correction region (B1) has a plurality of first peaks (S1) and a plurality of peaks in the refractive power distribution curve. The third refractive correction region (C1) has a first wave (T1) and has a plurality of second wave peaks (S2) and a plurality of second wave peaks (T2) in the refractive power distribution curve. However, in another embodiment, the second refractive correction region (B1) and the third refractive correction region (C1) may each have at least one wave peak in the refractive power distribution curve.
[0014] In order for the above ophthalmic lens (100) to have a good vision correction effect, in Example 1, the ophthalmic lens (100) satisfies the following condition formula:
[0015] (1) 3.5mm Z1+Z2+Z3+Z4 5.0mm;
[0016] (2) 0.25mm Z1 1.4mm;
[0017] (3) 0.25mm Z2 1.4mm;
[0018] (4) 0.25mm Z3 1.4mm;
[0019] (5) 0.25mm Z4 1.4mm;
[0020] (6) -1.00D PPSD 1.00D;
[0021] (7) -3.00D PPSD-PPS1 3.00D;
[0022] (8) -4.00D PPS1-PPS1 4.00D
[0023] (9) 1.00D │PPS1-PPT1│ 4.00D;
[0024] (10) 1.00D │PPS2-PPT2│ 4.00D.
[0025] Here, Z1 is the interval at which the central optical zone (10) extends from the center point to the boundary of the central optical zone (10), the boundary of the central optical zone (10) is the position where the central optical zone (10) and the first outer ring optical zone (20) meet, and the center point is the starting point of the refractive power distribution curve; Z2 is the interval at which the first outer ring optical zone (20) extends from the boundary of the central optical zone (10) to the boundary of the first outer ring optical zone (20), the boundary of the first outer ring optical zone (20) is the position where the first outer ring optical zone (20) and the second outer ring optical zone (30) meet; Z3 is the interval at which the second outer ring optical zone (30) extends from the boundary of the first outer ring optical zone (20) to the boundary of the second outer ring optical zone (30), and the boundary of the second outer ring optical zone (30) is the position where the second outer ring optical zone (30) and the third outer ring optical zone (40) meet; Z4 is the interval at which the third outer ring optical zone (40) extends from the boundary of the second outer ring optical zone (30) to the boundary of the third outer ring optical zone (40), and the boundary of the third outer ring optical zone (40) is the outer periphery of the ophthalmic lens; PPSD is the refractive power of each of the first refractive correction zones (A1); PPS1 is the maximum refractive power of each first wave peak (S1) in the second refractive correction area (B1), and PPT1 is the minimum refractive power of each first wave trough (T1) in the second refractive correction area (B1), wherein the maximum refractive power (PPS1) of the second refractive correction area (B1) is based on the highest first wave peak (S1), and the minimum refractive power (PPT1) of the second refractive correction area (B1) is based on the lowest first wave trough (T1);PPS2 is the maximum refractive power of each second wave peak (S2) in the third refractive correction area (C1), and PPT2 is the minimum refractive power of each second wave trough (T2) in the third refractive correction area (C1), wherein the maximum refractive power (PPS2) of the third refractive correction area (C1) is based on the highest second wave peak (S2), and the minimum refractive power (PPT2) of the third refractive correction area (C1) is based on the lowest second wave trough (T2).
[0026] As can be seen from the refractive power distribution curve of FIG. 1b, in Example 1, the central optical zone (10) is extended from the center point to the boundary of the central optical zone (10) with a spacing Z1 = 1.0 mm, the first outer ring optical zone (20) is extended from the boundary of the central optical zone (10) to the boundary of the first outer ring optical zone (20) with a spacing Z2 = 1.0 mm, the second outer ring optical zone (30) is extended from the boundary of the first outer ring optical zone (20) to the boundary of the second outer ring optical zone (30) with a spacing Z3 = 1.0 mm, the third outer ring optical zone (40) is extended from the boundary of the second outer ring optical zone (30) to the boundary of the third outer ring optical zone (40) with a spacing Z4 = 1.0 mm, and the third outer ring optical zone (40) from the center point of the central optical zone (10) in the refractive power distribution curve The total length to the boundary Z1+Z2+Z3+Z4=4.0mm; the refractive power of each of the first refractive correction areas (A1) is PPSD=-1.00D, the maximum refractive power of the second refractive correction area (B1) is PPS1=1.00D, and the minimum refractive power of the second refractive correction area (B1) is PPT1=0.00D; the maximum refractive power of the third refractive correction area (C1) is PPS2=2.00D, and the minimum refractive power of the third refractive correction area (C1) is PPT2=-1.00D.
[0027] Accordingly, based on the detailed numerical values of the above refractive power distribution curve, the conditional equation of the ophthalmic lens (100) in Example 1 has the following specific numerical values:
[0028] (1) Z1+Z2+Z3+Z4=4.0mm;
[0029] (2) Z1=1.0mm;
[0030] (3) Z2=1.0mm;
[0031] (4) Z3=1.0mm;
[0032] (5) Z4=1.0mm;
[0033] (6) PPSD=-1.00D;
[0034] (7) PPSD-PPS1=-2.00D;
[0035] (8) PPS1-PPS2=-1.00D;
[0036] (9)│PPS1-PPT1│=1.00D;
[0037] (10)│PPS2-PPT2│=1.00D.
[0038] In this way, Example 1 satisfies all of the condition equations (1) to (10) set for the ophthalmic lens (100); furthermore, the arrangement of the refractive power of the two first refractive correction regions (A1), the second refractive correction region (B1), and the third refractive correction region (C1) in the ophthalmic lens (100) of Example 1 consists of a refractive power change that gradually increases in the order of the first outer ring optical region (20), the second outer ring optical region (30), and the third outer ring optical region (40), and the drop between the maximum and minimum refractive power values of the second refractive correction region (B1) |PPS1-PPT1| and the drop between the maximum and minimum refractive power values of the third refractive correction region (C1) |PPS2-PPT2| are all the same. In this way, the ophthalmic lens (100) provides an effect of reducing visual fatigue of the wearer by reducing the drop in refractive power between any two adjacent central optical zones (10), the first outer ring optical zone (20), the second outer ring optical zone (30), and the third outer ring optical zone (40) through a multifocal refractive power design, thereby providing a clearer and more comfortable effect when wearing the ophthalmic lens (100).
[0039] Referring to FIG. 2, the ophthalmic lens (200) of preferred embodiment 2 of the present invention comprises a central optical zone (10), a first outer ring optical zone (20), a second outer ring optical zone (30), and a third outer ring optical zone (40). The shape of the central optical zone (10), the first outer ring optical zone (20), the second outer ring optical zone (30), and the third outer ring optical zone (40) of embodiment 2 is basically the same as the description of embodiment 1 above, which means that the first outer ring optical zone (20), the second outer ring optical zone (30), and the third outer ring optical zone (40) sequentially surround the periphery of the central optical zone (10).
[0040] The ophthalmic lens (200) is defined with two first refractive correction areas (A2), one second refractive correction area (B2), and one third refractive correction area (C2), and the two first refractive correction areas (A2), the second refractive correction area (B2), and the third refractive correction area (C2) are arbitrarily placed in the central optical zone (10), the first outer ring optical zone (20), the second outer ring optical zone (30), and the third outer ring optical zone (40); As illustrated in FIG. 2, in Example 2, in the refractive power distribution curve of the ophthalmic lens (200), the two first refractive correction regions (A2) are respectively located in the central optical zone (10) and the second outer ring optical zone (30), the second refractive correction region (B2) is located in the first outer ring optical zone (20), and the third refractive correction region (C2) is located in the third outer ring optical zone (40). Each of the first refractive correction regions (A2) represents a horizontal straight line in the refractive power distribution curve, and the second refractive correction region (B2) and the third refractive correction region (C2) each represent a continuously changing waveform in the refractive power distribution curve. The second refractive correction region (B2) and the third refractive correction region (C2) each have a plurality of peaks. Specifically, the second refractive correction region (B2) has a plurality of first peaks (S1) and a plurality of first peaks in the refractive power distribution curve. The third refractive correction region (C2) has a wave curve (T1) and has a plurality of second wave peaks (S2) and a plurality of second wave curves (T2) in the refractive power distribution curve. However, in another embodiment, the second refractive correction region (B2) and the third refractive correction region (C2) may each have at least one wave peak in the refractive power distribution curve.
[0041] In order for the above ophthalmic lens (200) to have a good vision correction effect, in Example 2, the ophthalmic lens (200) satisfies the following condition formula:
[0042] (1) 3.5mm Z1+Z2+Z3+Z4 5.0mm;
[0043] (2) 0.25mm Z1 1.4mm;
[0044] (3) 0.25mm Z2 1.4mm;
[0045] (4) 0.25mm Z3 1.4mm;
[0046] (5) 0.25mm Z4 1.4mm;
[0047] (6) -1.00D PPSD 1.00D;
[0048] (7) -3.00D PPSD-PPS1 3.00D;
[0049] (8) -4.00D PPS1-PPS2 4.00D;
[0050] (9) 1.00D │PPS1-PPT1│ 4.00D;
[0051] (10) 1.00D │PPS2-PPT2│ 4.00D.
[0052] Here, Z1 is the interval in which the central optical zone (10) extends from the center point to the boundary of the central optical zone (10); Z2 is the interval in which the first outer ring optical zone (20) extends from the boundary of the central optical zone (10) to the boundary of the first outer ring optical zone (20); Z3 is the interval in which the second outer ring optical zone (30) extends from the boundary of the first outer ring optical zone (20) to the boundary of the second outer ring optical zone (30); Z4 is the interval in which the third outer ring optical zone (40) extends from the boundary of the second outer ring optical zone (30) to the boundary of the third outer ring optical zone (40); PPSD is the refractive power of each of the first refractive correction zones (A2); PPS1 is the maximum refractive power of each first wave peak (S1) in the second refractive correction area (B2), and PPT1 is the minimum refractive power of each first wave trough (T1) in the second refractive correction area (B2); PPS2 is the maximum refractive power of each second wave peak (S2) in the third refractive correction area (C2), and PPT2 is the minimum refractive power of each second wave trough (T2) in the third refractive correction area (C2).
[0053] As can be seen from the refractive power distribution curve of FIG. 2, in Example 2, the central optical zone (10) has a spacing Z1 = 1.0 mm extending from the center point to the boundary of the central optical zone (10), the first outer ring optical zone (20) has a spacing Z2 = 1.0 mm extending from the boundary of the central optical zone (10) to the boundary of the first outer ring optical zone (20), the second outer ring optical zone (30) has a spacing Z3 = 1.0 mm extending from the boundary of the first outer ring optical zone (20) to the boundary of the second outer ring optical zone (30), the third outer ring optical zone (40) has a spacing Z4 = 1.0 mm extending from the boundary of the second outer ring optical zone (30) to the boundary of the third outer ring optical zone (40), and the third outer ring optical zone (40) from the center point of the central optical zone (10) in the refractive power distribution curve The total length to the boundary Z1+Z2+Z3+Z4=4.0mm; the refractive power of each of the first refractive correction areas (A2) is PPSD=-1.00D, the maximum refractive power of the second refractive correction area (B2) is PPS1=1.00D, and the minimum refractive power of the second refractive correction area (B2) is PPT1=0.00D; the maximum refractive power of the third refractive correction area (C2) is PPS2=2.00D, and the minimum refractive power of the third refractive correction area (C2) is PPT2=1.00D.
[0054] Accordingly, based on the detailed numerical values of the above refractive power distribution curve, the conditional equation of the ophthalmic lens (200) in Example 2 has the following specific numerical values:
[0055] (1) Z1+Z2+Z3+Z4=4.0mm;
[0056] (2) Z1=1.0mm;
[0057] (3) Z2=1.0mm;
[0058] (4) Z3=1.0mm;
[0059] (5) Z4=1.0mm;
[0060] (6) PPSD=-1.00D;
[0061] (7) PPSD-PPS1=-2.00D;
[0062] (8) PPS1-PPS2=-1.00D;
[0063] (9)│PPS1-PPT1│=1.00D;
[0064] (10)│PPS2-PPT2│=1.00D.
[0065] In this way, Example 2 satisfies all of the condition equations (1) to (10) set for the ophthalmic lens (200); furthermore, in the ophthalmic lens (200) of Example 2, the second refractive correction area (B2) is located between the two first refractive correction areas (A2), and the third refractive correction area (C2) is located on one side of one of the two first refractive correction areas (A2), and the refractive power of the second refractive correction area (B2) and the third refractive correction area (C2) are each higher than the refractive power of the first refractive correction area (A2), and the difference between the maximum and minimum refractive power values of the second refractive correction area (B2) |PPS1-PPT1| and the difference between the maximum and minimum refractive power values of the third refractive correction area (C2) |PPS2-PPT2| are all the same. In this way, the ophthalmic lens (200) provides an effect of reducing visual fatigue of the wearer by reducing the drop in refractive power between any two adjacent central optical zones (10), the first outer ring optical zone (20), the second outer ring optical zone (30), and the third outer ring optical zone (40) through a multifocal refractive power design, thereby providing a clearer and more comfortable effect when wearing the ophthalmic lens (200).
[0066] Referring to FIG. 3, the ophthalmic lens (300) of preferred embodiment 3 of the present invention comprises a central optical zone (10), a first outer ring optical zone (20), a second outer ring optical zone (30), and a third outer ring optical zone (40). The shape of the central optical zone (10), the first outer ring optical zone (20), the second outer ring optical zone (30), and the third outer ring optical zone (40) of embodiment 3 is basically the same as the description of embodiment 1 above, which means that the first outer ring optical zone (20), the second outer ring optical zone (30), and the third outer ring optical zone (40) sequentially surround the periphery of the central optical zone (10).
[0067] The ophthalmic lens (300) is defined with two first refractive correction areas (A3), one second refractive correction area (B3), and one third refractive correction area (C3), and the two first refractive correction areas (A3), the second refractive correction area (B3), and the third refractive correction area (C3) are arbitrarily placed in the central optical zone (10), the first outer ring optical zone (20), the second outer ring optical zone (30), and the third outer ring optical zone (40); As illustrated in FIG. 3, in Example 3, in the refractive power distribution curve of the ophthalmic lens (300), the two first refractive correction regions (A3) are respectively located in the central optical zone (10) and the third outer ring optical zone (40), the second refractive correction region (B3) is located in the first outer ring optical zone (20), and the third refractive correction region (C3) is located in the second outer ring optical zone (30). Each of the first refractive correction regions (A3) represents a horizontal straight line in the refractive power distribution curve, and the second refractive correction region (B3) and the third refractive correction region (C3) each represent a continuously changing waveform in the refractive power distribution curve. The second refractive correction region (B3) and the third refractive correction region (C3) each have a plurality of peaks. Specifically, the second refractive correction region (B3) has a plurality of first peaks (S1) and a plurality of first The third refractive correction region (C3) has a wave curve (T1) and has a plurality of second wave peaks (S2) and a plurality of second wave curves (T2) in the refractive power distribution curve. However, in another embodiment, the second refractive correction region (B3) and the third refractive correction region (C3) may each have only at least one wave peak in the refractive power distribution curve.
[0068] In order for the above ophthalmic lens (300) to have a good vision correction effect, in Example 3, the ophthalmic lens (300) satisfies the following condition:
[0069] (1) 3.5mm Z1+Z2+Z3+Z4 5.0mm;
[0070] (2) 0.25mm Z1 1.4mm;
[0071] (3) 0.25mm Z2 1.4mm;
[0072] (4) 0.25mm Z3 1.4mm;
[0073] (5) 0.25mm Z4 1.4mm;
[0074] (6) -1.00D PPSD 1.00D;
[0075] (7) -3.00D PPSD-PPS1 3.00D;
[0076] (8) -4.00D PPS1-PPS2 4.00D;
[0077] (9) 1.00D │PPS1-PPT1│ 4.00D;
[0078] (10) 1.00D │PPS2-PPT2│ 4.00D.
[0079] Here, Z1 is the interval in which the central optical zone (10) extends from the center point to the boundary of the central optical zone (10); Z2 is the interval in which the first outer ring optical zone (20) extends from the boundary of the central optical zone (10) to the boundary of the first outer ring optical zone (20); Z3 is the interval in which the second outer ring optical zone (30) extends from the boundary of the first outer ring optical zone (20) to the boundary of the second outer ring optical zone (30); Z4 is the interval in which the third outer ring optical zone (40) extends from the boundary of the second outer ring optical zone (30) to the boundary of the third outer ring optical zone (40); PPSD is the refractive power of each of the first refractive correction zones (A3); PPS1 is the maximum refractive power of each first wave peak (S1) in the second refractive correction area (B3), and PPT1 is the minimum refractive power of each first wave trough (T1) in the second refractive correction area (B3); PPS2 is the maximum refractive power of each second wave peak (S2) in the third refractive correction area (C3), and PPT2 is the minimum refractive power of each second wave trough (T2) in the third refractive correction area (C3).
[0080] As can be seen from the refractive power distribution curve of FIG. 3, in Example 3, the central optical zone (10) has a spacing Z1 = 1.0 mm extending from the center point to the boundary of the central optical zone (10), the first outer ring optical zone (20) has a spacing Z2 = 1.0 mm extending from the boundary of the central optical zone (10) to the boundary of the first outer ring optical zone (20), the second outer ring optical zone (30) has a spacing Z3 = 1.0 mm extending from the boundary of the first outer ring optical zone (20) to the boundary of the second outer ring optical zone (30), the third outer ring optical zone (40) has a spacing Z4 = 1.0 mm extending from the boundary of the second outer ring optical zone (30) to the boundary of the third outer ring optical zone (40), and the third outer ring optical zone (40) from the center point of the central optical zone (10) in the refractive power distribution curve The total length to the boundary is Z1+Z2+Z3+Z4=4.0mm; the refractive power of each of the first refractive correction areas (A3) is PPSD=-1.00D, the maximum refractive power of the second refractive correction area (B3) is PPS1=1.00D, and the minimum refractive power of the second refractive correction area (B3) is PPT1=0.00D; the maximum refractive power of the third refractive correction area (C3) is PPS2=2.00D, and the minimum refractive power of the third refractive correction area (C3) is PPT2=1.00D.
[0081] Accordingly, based on the detailed numerical values of the above refractive power distribution curve, the conditional equation of the ophthalmic lens (300) in Example 3 has the following specific numerical values:
[0082] (1) Z1+Z2+Z3+Z4=4.0mm;
[0083] (2) Z1=1.0mm;
[0084] (3) Z2=1.0mm;
[0085] (4) Z3=1.0mm;
[0086] (5) Z4=1.0mm;
[0087] (6) PPSD=-1.00D;
[0088] (7) PPSD-PPS1=-2.00D;
[0089] (8) PPS1-PPS2=-1.00D;
[0090] (9)│PPS1-PPT1│=1.00D;
[0091] (10)│PPS2-PPT2│=1.00D.
[0092] In this way, Example 3 satisfies all of the condition equations (1) to (10) set for the ophthalmic lens (300); furthermore, the second refractive correction area (B3) and the third refractive correction area (C3) in the ophthalmic lens (300) of Example 3 are each located between the two first refractive correction areas (A3), and the refractive power of the second refractive correction area (B3) and the third refractive correction area (C3) is each higher than the refractive power of the first refractive correction area (A3), and the difference between the maximum and minimum refractive power values of the second refractive correction area (B3) |PPS1-PPT1| and the difference between the maximum and minimum refractive power values of the third refractive correction area (C3) |PPS2-PPT2| are all the same. In this way, the ophthalmic lens (300) provides an effect of reducing visual fatigue of the wearer by reducing the drop in refractive power between any two adjacent central optical zones (10), the first outer ring optical zone (20), the second outer ring optical zone (30), and the third outer ring optical zone (40) through a multifocal refractive power design, thereby providing a clearer and more comfortable effect when wearing the ophthalmic lens (300).
[0093] Referring to FIG. 4, the ophthalmic lens (300) of preferred embodiment 4 of the present invention comprises a central optical zone (10), a first outer ring optical zone (20), a second outer ring optical zone (30), and a third outer ring optical zone (40). The shape of the central optical zone (10), the first outer ring optical zone (20), the second outer ring optical zone (30), and the third outer ring optical zone (40) of embodiment 4 is basically the same as the description of embodiment 1 above, which means that the first outer ring optical zone (20), the second outer ring optical zone (30), and the third outer ring optical zone (40) sequentially surround the periphery of the central optical zone (10).
[0094] The ophthalmic lens (400) has two first refractive correction areas (A4), one second refractive correction area (B4), and one third refractive correction area (C4) defined therein, and the two first refractive correction areas (A4), the second refractive correction area (B4), and the third refractive correction area (C4) are arbitrarily placed in the central optical zone (10), the first outer ring optical zone (20), the second outer ring optical zone (30), and the third outer ring optical zone (40); As illustrated in FIG. 4, in Example 4, in the refractive power distribution curve of the ophthalmic lens (400), the two first refractive correction regions (A4) are arranged adjacent to the first outer ring optical zone (20) and the second outer ring optical zone (30), the second refractive correction region (B4) is located in the central optical zone (10), and the third refractive correction region (C4) is located in the third outer ring optical zone (40). Each of the first refractive correction regions (A4) represents a horizontal straight line in the refractive power distribution curve, and the second refractive correction region (B4) and the third refractive correction region (C4) each represent a continuously changing waveform in the refractive power distribution curve. The second refractive correction region (B4) and the third refractive correction region (C4) each have a plurality of peaks. Specifically, the second refractive correction region (B4) has a plurality of first peaks (S1) and a plurality of first peaks in the refractive power distribution curve. The third refractive correction region (C4) has a wave curve (T1) and has a plurality of second wave peaks (S2) and a plurality of second wave curves (T2) in the refractive power distribution curve. However, in another embodiment, the second refractive correction region (B4) and the third refractive correction region (C4) may each have at least one wave peak in the refractive power distribution curve.
[0095] In order for the above ophthalmic lens (400) to have a good vision correction effect, in Example 4, the ophthalmic lens (400) satisfies the following condition:
[0096] (1) 3.5mm Z1+Z2+Z3+Z4 5.0mm;
[0097] (2) 0.25mm Z1 1.4mm;
[0098] (3) 0.25mm Z2 1.4mm;
[0099] (4) 0.25mm Z3 1.4mm;
[0100] (5) 0.25mm Z4 1.4mm;
[0101] (6) -1.00D PPSD 1.00D;
[0102] (7) -3.00D PPSD-PPS1 3.00D;
[0103] (8) -4.00D PPS1-PPS2 4.00D;
[0104] (9) 1.00D │PPS1-PPT1│ 4.00D;
[0105] (10) 1.00D │PPS2-PPT2│ 4.00D.
[0106] Here, Z1 is the interval in which the central optical zone (10) extends from the center point to the boundary of the central optical zone (10); Z2 is the interval in which the first outer ring optical zone (20) extends from the boundary of the central optical zone (10) to the boundary of the first outer ring optical zone (20); Z3 is the interval in which the second outer ring optical zone (30) extends from the boundary of the first outer ring optical zone (20) to the boundary of the second outer ring optical zone (30); Z4 is the interval in which the third outer ring optical zone (40) extends from the boundary of the second outer ring optical zone (30) to the boundary of the third outer ring optical zone (40); PPSD is the refractive power of each of the first refractive correction zones (A4); PPS1 is the maximum refractive power of each first wave peak (S1) in the second refractive correction area (B4), and PPT1 is the minimum refractive power of each first wave trough (T1) in the second refractive correction area (B4); PPS2 is the maximum refractive power of each second wave peak (S2) in the third refractive correction area (C4), and PPT2 is the minimum refractive power of each second wave trough (T2) in the third refractive correction area (C4).
[0107] As can be seen from the refractive power distribution curve of FIG. 4, in Example 4, the central optical zone (10) is extended from the center point to the boundary of the central optical zone (10) at a distance Z1 = 1.0 mm, the first outer ring optical zone (20) is extended from the boundary of the central optical zone (10) to the boundary of the first outer ring optical zone (20) at a distance Z2 = 1.0 mm, the second outer ring optical zone (30) is extended from the boundary of the first outer ring optical zone (20) to the boundary of the second outer ring optical zone (30) at a distance Z3 = 1.0 mm, the third outer ring optical zone (40) is extended from the boundary of the second outer ring optical zone (30) to the boundary of the third outer ring optical zone (40) at a distance Z4 = 1.0 mm, and the third outer ring optical zone (40) at the center point of the central optical zone (10) in the refractive power distribution curve The total length to the boundary Z1+Z2+Z3+Z4=4.0mm; the refractive power of each of the first refractive correction areas (A4) is PPSD=-1.00D, the maximum refractive power of the second refractive correction area (B4) is PPS1=1.00D, and the minimum refractive power of the second refractive correction area (B4) is PPT1=0.00D; the maximum refractive power of the third refractive correction area (C4) is PPS2=2.00D, and the minimum refractive power of the third refractive correction area (C4) is PPT2=1.00D.
[0108] Accordingly, based on the detailed numerical values of the above refractive power distribution curve, the conditional equation of the ophthalmic lens (400) in Example 4 has the following specific numerical values:
[0109] (1) Z1+Z2+Z3+Z4=4.0mm;
[0110] (2) Z1=1.0mm;
[0111] (3) Z2=1.0mm;
[0112] (4) Z3=1.0mm;
[0113] (5) Z4=1.0mm;
[0114] (6) PPSD=-1.00D;
[0115] (7) PPSD-PPS1=-2.00D;
[0116] (8) PPS1-PPS2=-1.00D;
[0117] (9) │PPS1-PPT1│=1.00D;
[0118] (10)│PPS2-PPT2│=1.00D.
[0119] In this way, Example 4 satisfies all of the condition equations (1) to (10) set for the ophthalmic lens (400); furthermore, the two first refractive correction regions (A4) in the ophthalmic lens (400) of Example 4 are arranged adjacently between the second refractive correction region (B4) and the third refractive correction region (C4), and the refractive power of the second refractive correction region (B4) and the third refractive correction region (C4) are each higher than the refractive power of the first refractive correction region (A4), and the difference between the maximum and minimum refractive power values of the second refractive correction region (B4) |PPS1-PPT1| and the difference between the maximum and minimum refractive power values of the third refractive correction region (C4) |PPS2-PPT2| are all the same. In this way, the ophthalmic lens (400) provides an effect of reducing visual fatigue of the wearer by reducing the drop in refractive power between any two adjacent central optical zones (10), the first outer ring optical zone (20), the second outer ring optical zone (30), and the third outer ring optical zone (40) through a multifocal refractive power design, thereby providing a clearer and more comfortable effect when wearing the ophthalmic lens (400).
[0120] Referring to FIG. 5, the ophthalmic lens (500) of preferred embodiment 5 of the present invention comprises a central optical zone (10), a first outer ring optical zone (20), a second outer ring optical zone (30), and a third outer ring optical zone (40). The shape of the central optical zone (10), the first outer ring optical zone (20), the second outer ring optical zone (30), and the third outer ring optical zone (40) of embodiment 5 is basically the same as the description of embodiment 1 above, which means that the first outer ring optical zone (20), the second outer ring optical zone (30), and the third outer ring optical zone (40) sequentially surround the periphery of the central optical zone (10).
[0121] The ophthalmic lens (500) is defined with two first refractive correction areas (A5), one second refractive correction area (B5), and one third refractive correction area (C5), and the two first refractive correction areas (A5), the second refractive correction area (B5), and the third refractive correction area (C5) are arbitrarily placed in the central optical zone (10), the first outer ring optical zone (20), the second outer ring optical zone (30), and the third outer ring optical zone (40); As illustrated in FIG. 5, in Example 5, in the refractive power distribution curve of the ophthalmic lens (500), the two first refractive correction regions (A5) are located in the first outer ring optical zone (20) and the second outer ring optical zone (30), the second refractive correction region (B5) is located in the central optical zone (10), and the third refractive correction region (C5) is located in the second outer ring optical zone (30). Each of the first refractive correction regions (A5) represents a horizontal straight line in the refractive power distribution curve, and the second refractive correction region (B5) and the third refractive correction region (C5) each represent a continuously changing waveform in the refractive power distribution curve. The second refractive correction region (B5) and the third refractive correction region (C5) each have a plurality of peaks. Specifically, the second refractive correction region (B5) has a plurality of first peaks (S1) and a plurality of first The third refractive correction region (C5) has a wave curve (T1) and has a plurality of second wave peaks (S2) and a plurality of second wave curves (T2) in the refractive power distribution curve. However, in another embodiment, the second refractive correction region (B5) and the third refractive correction region (C5) may each have only at least one wave peak in the refractive power distribution curve.
[0122] In order for the above ophthalmic lens (500) to have a good vision correction effect, in Example 5, the ophthalmic lens (500) satisfies the following condition:
[0123] (1) 3.5mm Z1+Z2+Z3+Z4 5.0mm;
[0124] (2) 0.25mm Z1 1.4mm;
[0125] (3) 0.25mm Z2 1.4mm;
[0126] (4) 0.25mm Z3 1.4mm;
[0127] (5) 0.25mm Z4 1.4mm;
[0128] (6) -1.00D PPSD 1.00D;
[0129] (7) -3.00D PPSD-PPS1 3.00D;
[0130] (8) -4.00D PPS1-PPS2 4.00D;
[0131] (9) 1.00D │PPS1-PPT1│ 4.00D;
[0132] (10) 1.00D │PPS2-PPT2│ 4.00D.
[0133] Here, Z1 is the interval in which the central optical zone (10) extends from the center point to the boundary of the central optical zone (10); Z2 is the interval in which the first outer ring optical zone (20) extends from the boundary of the central optical zone (10) to the boundary of the first outer ring optical zone (20); Z3 is the interval in which the second outer ring optical zone (30) extends from the boundary of the first outer ring optical zone (20) to the boundary of the second outer ring optical zone (30); Z4 is the interval in which the third outer ring optical zone (40) extends from the boundary of the second outer ring optical zone (30) to the boundary of the third outer ring optical zone (40); PPSD is the refractive power of each of the first refractive correction zones (A5); PPS1 is the maximum refractive power of each first wave peak (S1) in the second refractive correction area (B5), and PPT1 is the minimum refractive power of each first wave trough (T1) in the second refractive correction area (B5); PPS2 is the maximum refractive power of each second wave peak (S2) in the third refractive correction area (C5), and PPT2 is the minimum refractive power of each second wave trough (T2) in the third refractive correction area (C5).
[0134] As can be seen from the refractive power distribution curve of FIG. 5, in Example 5, the central optical zone (10) is extended from the center point to the boundary of the central optical zone (10) at a distance Z1 = 1.0 mm, the first outer ring optical zone (20) is extended from the boundary of the central optical zone (10) to the boundary of the first outer ring optical zone (20) at a distance Z2 = 1.0 mm, the second outer ring optical zone (30) is extended from the boundary of the first outer ring optical zone (20) to the boundary of the second outer ring optical zone (30) at a distance Z3 = 1.0 mm, the third outer ring optical zone (40) is extended from the boundary of the second outer ring optical zone (30) to the boundary of the third outer ring optical zone (40) at a distance Z4 = 1.0 mm, and the third outer ring optical zone (40) at the center point of the central optical zone (10) in the refractive power distribution curve The total length to the boundary Z1+Z2+Z3+Z4=4.0mm; the refractive power of each of the first refractive correction areas (A5) is PPSD=-1.00D, the maximum refractive power of the second refractive correction area (B5) is PPS1=1.00D, and the minimum refractive power of the second refractive correction area (B5) is PPT1=0.00D; the maximum refractive power of the third refractive correction area (C5) is PPS2=2.00D, and the minimum refractive power of the third refractive correction area (C5) is PPT2=1.00D.
[0135] Accordingly, based on the detailed numerical values of the above refractive power distribution curve, the conditional equation of the ophthalmic lens (500) in Example 5 has the following specific numerical values:
[0136] (1) Z1+Z2+Z3+Z4=4.0mm;
[0137] (2) Z1=1.0mm;
[0138] (3) Z2=1.0mm;
[0139] (4) Z3=1.0mm;
[0140] (5) Z4=1.0mm;
[0141] (6) PPSD=-1.00D;
[0142] (7) PPSD-PPS1=-2.00D;
[0143] (8) PPS1-PPS2=-1.00D;
[0144] (9) │PPS1-PPT1│=1.00D;
[0145] (10) │PPS2-PPT2│=1.00D.
[0146] In this way, Example 5 satisfies all of the condition equations (1) to (10) set for the ophthalmic lens (500); furthermore, in the ophthalmic lens (500) of Example 5, the first refractive correction area (A5) is located between the second refractive correction area (B5) and the third refractive correction area (C4), and the other first refractive correction area (A5) is located on one side of the third refractive correction area (C5), and the refractive power of the second refractive correction area (B5) and the third refractive correction area (C5) are each higher than the refractive power of the first refractive correction area (A5), and the difference between the maximum and minimum refractive power values of the second refractive correction area (B5) |PPS1-PPT1| and the difference between the maximum and minimum refractive power values of the third refractive correction area (C5) |PPS2-PPT2| are all the same. In this way, the ophthalmic lens (500) provides an effect of reducing visual fatigue of the wearer by reducing the drop in refractive power between any two adjacent central optical zones (10), the first outer ring optical zone (20), the second outer ring optical zone (30), and the third outer ring optical zone (40) through a multifocal refractive power design, thereby providing a clearer and more comfortable effect when wearing the ophthalmic lens (500).
[0147] To summarize the above, the ophthalmic lenses of Examples 1 to 5 provide an effect that reduces visual fatigue in the wearer by reducing the drop in refractive power between any two adjacent central optical zones (10), the first outer ring optical zone (20), the second outer ring optical zone (30), and the third outer ring optical zone (30) through a multifocal refractive power design, thereby providing a clearer and more comfortable effect when wearing the ophthalmic lenses. In addition, the ophthalmic lenses can arbitrarily distribute the first refractive correction area, the second refractive correction area, and the third refractive correction area to the central optical zone, the first outer ring optical zone, the second outer ring optical zone, and the third outer ring optical zone according to the vision correction requirements, and increase the diversity of the refractive power arrangement of the ophthalmic lenses by adjusting and distributing the refractive power to each refractive correction area.
[0148] The foregoing is merely a preferred and feasible embodiment of the present invention, and all equivalent variations made by applying the specification and claims of the present invention shall be included within the scope of the present invention. Explanation of the symbols
[0149] 100, 200, 300, 400, 500: Ophthalmic lenses 10: Central optical zone 20: First outer ring optical zone 30: Second outer ring optical zone 40: Third outer ring optical zone O: Center point S1: 1st break T1: 1st wave S2: 2nd break T2: Second Wave A1, A2, A3, A4, A5: First refractive correction area B1, B2, B3, B4, B5: Second refractive correction area C1, C2, C3, C4, C5: Third refractive correction area
Claims
Claim 1 In an ophthalmic lens, a central optical zone having a center point; a first outer ring optical zone surrounding the periphery of the central optical zone; and a second outer ring optical zone surrounding the periphery of the first outer ring optical zone; and a third outer ring optical zone surrounding the periphery of the second outer ring optical zone; wherein the ophthalmic lens has two first refractive correction zones, one second refractive correction zone, and one third refractive correction zone defined, and the two first refractive correction zones, the second refractive correction zone, and the third refractive correction zone are arbitrarily positioned in the central optical zone, the first outer ring optical zone, and the second outer ring optical zone, and the ophthalmic lens has a refractive power distribution curve, each of the first refractive correction zones represents a horizontal straight line in the refractive power distribution curve, and the second refractive correction zone and the third refractive correction zone each represent a waveform in the refractive power distribution curve, and the second refractive correction zone and the third refractive correction zone each have at least one peak; where, the ophthalmic lens has the following range: 3.5 mm Z1+Z2+Z3+Z4 An ophthalmic lens satisfying 5.0 mm, wherein Z1 is a distance in which the central optical zone extends from the center point to the boundary of the central optical zone; Z2 is a distance in which the first outer ring optical zone extends from the boundary of the central optical zone to the boundary of the first outer ring optical zone; Z3 is a distance in which the second outer ring optical zone extends from the boundary of the first outer ring optical zone to the boundary of the second outer ring optical zone; and Z4 is a distance in which the third outer ring optical zone extends from the boundary of the second outer ring optical zone to the boundary of the third outer ring optical zone. Claim 2 An ophthalmic lens according to claim 1, wherein the two first refractive correction regions are located in two of the central optical region, the first outer ring optical region, the second outer ring optical region, and the third outer ring optical region, and the second refractive correction region and / or the third refractive correction region is arranged between the two first refractive correction regions. Claim 3 An ophthalmic lens according to claim 1, wherein the two first refractive correction regions are arranged adjacent to two of the central optical region, the first outer ring optical region, the second outer ring optical region, and the third outer ring optical region, and the second refractive correction region or the third refractive correction region is arranged on one side of one of the two first refractive correction regions. Claim 4 An ophthalmic lens according to claim 1, wherein the two first refractive correction regions are arranged adjacent to the first outer ring optical region and the second outer ring optical region, the second refractive correction region and the third refractive correction region are located in the central optical region and the third outer ring optical region, and the two first refractive correction regions are arranged between the second refractive correction region and the third refractive correction region. Claim 5 In any one of claims 1 to 4, the ophthalmic lens is in the following range: -1.00D PPSD An ophthalmic lens that satisfies 1.00D, wherein PPSD is the refractive power of each of the first refractive correction regions. Claim 6 In any one of claims 1 to 4, the ophthalmic lens is in the following range: -3.00D PPSD-PPS1 An ophthalmic lens that satisfies 3.00D, wherein PPSD is the refractive power of each of the first refractive correction regions and PPS1 is the maximum refractive power of the second refractive correction region. Claim 7 In any one of claims 1 to 4, the ophthalmic lens is in the following range: -4.00D PPS1-PPS2 An ophthalmic lens satisfying 4.00D, wherein PPS1 is the maximum refractive power of the second refractive correction area and PPS2 is the maximum refractive power of the third refractive correction area. Claim 8 In any one of claims 1 to 4, the second refractive correction region has a plurality of first peaks and a plurality of first troughs in the refractive power distribution curve, and the ophthalmic lens has the following range: 1.00D │PPS1-PPT1│ An ophthalmic lens satisfying 4.00D, wherein PPS1 is the maximum refractive power of each of the first wave peaks in the second refractive correction area and PPT1 is the minimum refractive power of each of the first wave troughs in the second refractive correction area. Claim 9 In any one of claims 1 to 4, the third refractive correction region has a plurality of second wave peaks and a plurality of second wave troughs that change continuously in the refractive power distribution curve, and the ophthalmic lens has the following range: 1.00D │PPS2-PPT2│ An ophthalmic lens satisfying 4.00D, wherein PPS2 is the maximum refractive power of each of the second wave peaks in the third refractive correction area, and PPT2 is the minimum refractive power of each of the second wave troughs in the third refractive correction area. Claim 10 In claim 1, the ophthalmic lens has the following range: 0.25mm Z1 An ophthalmic lens satisfying 1.4mm, wherein Z1 is the interval in which the central optical zone extends from the center point to the boundary of the central optical zone. Claim 11 In claim 1, the ophthalmic lens has the following range: 0.25mm Z2 An ophthalmic lens satisfying 1.4 mm, wherein Z2 is a gap in which the first outer ring optical zone extends from the boundary of the central optical zone to the boundary of the first outer ring optical zone. Claim 12 In claim 1, the ophthalmic lens has the following range: 0.25mm Z3 An ophthalmic lens satisfying 1.4 mm, wherein Z3 is a gap in which the second outer ring optical zone extends from the boundary of the first outer ring optical zone to the boundary of the second outer ring optical zone. Claim 13 In claim 1, the ophthalmic lens has the following range: 0.25mm Z1 An ophthalmic lens satisfying 1.4mm, wherein Z4 is a gap in which the third outer ring optical zone extends from the boundary of the second outer ring optical zone to the boundary of the third outer ring optical zone.