TW202311820A - Multifocal ophthalmic lens - Google Patents

Abstract

The present invention provides a multifocal ophthalmic lens comprising an optic zone and a non-optic zone surrounding the optic zone, wherein a diopter profile of the optic zone is changing continuously with the distance between the position and the center point of the lens. The present invention also provides a multifocal ophthalmic lens comprising an optic zone including a central area having a diopter D1, a first surrounding area having a diopter D2 and a second surrounding area having a diopter D3, wherein D2 > D1 > D3.

Description

Multifocal Ophthalmic Lenses

The invention relates to a multi-focal ophthalmic lens, which provides different corrected vision areas for vision correctors, so that the corrector can get better results when using ophthalmic lenses in general, or when looking at distant objects and near objects alternately. Good visual experience.

In the design of traditional multifocal ophthalmic lenses, as shown in Figure 7, a value of one diopter will be used in the center of the lens, and the value of diopter will be gradually reduced from the center of the lens to the periphery of the lens (Zone B ⁰ ), that is, the degree of myopia correction Higher and higher. However, with this design, when looking at a distant object, the eyes will see the A ⁰ zone (the area with a larger diopter value) and the C ⁰ zone (the area with a smaller diopter value), that is, when looking at a distant object , the periphery has a clear image but the center of the lens will appear blurred, resulting in uncomfortable wearing. This is the blind area of the traditional multi-focal ophthalmic lens, and it is also the problem that the multi-focal ophthalmic lens of the present invention intends to solve.

An object of the present invention is to provide a multifocal ophthalmic lens, which includes an optical zone and a non-optical zone surrounding the optical zone, wherein the diopter of different positions of the optical zone varies with the distance between the position and the center point of the lens. The distance varies continuously. The optical zone may include: a central zone having a diopter _D1 ; a first peripheral zone surrounding the central zone and having a diopter _D2 ; and a second peripheral zone surrounding the first peripheral zone and having a diopter D ₃ , wherein D ₂ >D ₁ >D ₃ . In addition, the continuous change may include two peaks C ₁ and C ₃ , the peak C ₁ corresponds to the diopter D ₂ , and the peak C ₃ corresponds to the diopter D ₃ .

Another object of the present invention is to provide a multifocal ophthalmic lens, comprising an optical zone, and a non-optical zone surrounding the optical zone, the optical zone includes: a central zone with a diopter D ₁ ; a first a peripheral area surrounding the central area and having a diopter D ₂ ; and a second peripheral area surrounding the first peripheral area and having a diopter D ₃ ; wherein D ₂ >D ₁ >D ₃ . Preferably, the diopter of different positions of the optical zone changes continuously with the distance between the position and the center point of the lens.

Yet another object of the present invention is to provide a multi-focal ophthalmic lens, comprising an optical zone, and a non-optical zone surrounding the optical zone, the optical zone includes: zone A, having a diopter D ₁ ; zone B, surrounding The A zone has a diopter D ₂ ; the C zone surrounds the B zone and has a diopter D ₃ ; and the D zone surrounds the C zone and has a diopter D ₄ ; wherein D ₁ , D ₂ , D ₃ and D ₄ has one of the following relationships: D ₂ >D ₁ ≧D ₃ >D ₄ , D ₂ >D ₃ >D ₁ >D ₄ or D ₃ >D ₂ >D ₁ >D ₄ . Preferably, the diopter of different positions of the optical zone changes continuously with the distance between the position and the center point of the lens.

Generally, the central zone or the A-zone encompasses a central point, eg, a geometric center, of the multifocal ophthalmic lens.

According to the present invention, the extent of the optical zone is about 3-4.5 mm extending outward from the central point. The optical zone may be substantially circular.

Multifocal ophthalmic lenses of the present invention include, but are not limited to, contact lenses, intraocular lenses, and corneal inlays or onlays.

In a specific embodiment, the range of the central area is 0.15-0.45 mm extending outward from the central point. The central area may be substantially circular.

In some specific embodiments, the range of the first peripheral area is 0.3-2.1 mm extending outward from the edge of the central area, and the range of the second peripheral area is 0.75-2.1 mm extending outward from the edge of the first peripheral area. 2.55 mm. The first peripheral area and the second peripheral area may respectively be substantially ring-shaped.

According to a specific embodiment of the present invention, the diopter at different positions of the optical zone changes continuously with the distance between the position and the center point of the lens, and includes three peaks C ₁ , C ₂ , C ₃ and two troughs T ₁ , T ₂ , the position of T 2 is the peak C ₁ , the valley T 1 , the peak C ₂ , the valley _{T 2 and} the peak C ₃ from a central point of the multifocal ophthalmic lens.

In a specific embodiment, the first peripheral area 105 can be further divided into a B area and a C area. Zone B surrounds the central zone 104 (ie, zone A), and zone C surrounds zone B. Wherein, the peak C ₁ is located in area B, the peak C ₂ is located in area C, and the peak C ₃ is located in the second peripheral area 106 (ie, area D).

According to some embodiments of the present invention, the central region has a diopter D ₁ , the peak C ₁ corresponds to a target diopter D ₂ , the peak C ₂ corresponds to a target diopter D ₃ , and the peak C ₃ corresponds to a target Diopter D ₄ . In some specific embodiments of the present invention, the curve change of the diopter of the optical zone has the following relationship: (1) D ₂ >D ₁ ≧D ₃ >D ₄ , (2) D ₂ >D ₃ >D ₁ > D ₄ , or (3) D ₃ >D ₂ >D ₁ >D ₄ .

Please refer to FIG. 1 and FIG. 2 at the same time. The multifocal ophthalmic lens 100 includes an optical zone 102 and a non-optical zone 108 surrounding the optical zone 102. As shown in FIG. 2 , the diopter of the optical zone 102 shows a continuous change. Please refer to FIG. 3 , the optical zone 102 may include: a central zone 104 having a diopter D ₁ , a first peripheral zone 105 surrounding the central zone 104 and having a diopter D ₂ , and a second peripheral zone 106 surrounding the first peripheral zone 105 and has a diopter of D ₃ , wherein D ₂ >D ₁ >D ₃ . Please refer to FIG. 4 , in a specific example, the diopter change curve may include peaks C ₁ , C ₃ and trough T ₂ , the positions of the peaks and troughs are from the center point 101 of the multifocal ophthalmic lens 100 (for example, a geometric center) to the outside (the edge of the multifocal ophthalmic lens 100) are C ₁ , T ₂ and C ₃ in sequence, wherein the lens area adjacent to the center point 101 can have a diopter D ₁ , and the peak C ₁ corresponds to a target The diopter D ₂ , the peak C ₃ corresponds to a target diopter D ₃ , and the change of the diopter curve of the optical zone 102 conforms to the following relationship: D ₂ >D ₁ >D ₃ . The larger the value of the diopter, the lower the degree of myopia correction; on the contrary, the smaller the value of the diopter, the higher the degree of myopia correction. The extent of the optic zone 102 may extend about 3 mm outward from the central point, corresponding to the average size of the pupil, for example, the optic zone 102 may be approximately circular with a radius of 3 mm.

Referring next to FIG. 3 , the optical zone 102 may include a central zone 104 , a first peripheral zone 105 , and a second peripheral zone 106 . The central area 104 covers a peripheral area of the central point 101 , the first peripheral area 105 surrounds the central area 104 , and the second peripheral area 106 surrounds the first peripheral area 105 . It should be noted that the districts in FIG. 3 are shown as concentric circles, but not limited thereto. For example, they may also be in the shape of an ellipse. The range of the central area 104 may extend from the central point 101 toward the edge of the multifocal ophthalmic lens 100 by 0.15-0.45 mm. For example, the central area 104 may be approximately a circle with a radius of about 0.25-0.3 mm.

Referring now to FIG. 4 , preferably, the diopters at different positions of the optical zone 102 change continuously with the distance between the central points 101 of the positions, wherein the central zone 104 has a diopter D ₁ , and the first peripheral zone 105 has a diopter D ₂ , and the second peripheral region 106 has a diopter of D ₃ . The curve change of the diopter of the optical zone 102 has the following relationship: D ₂ >D ₁ >D ₃ . In a specific example, the curve of diopter change includes peaks C ₁ , C ₃ and trough T ₂ , peak C ₁ is located in the first peripheral region 105, and peak C ₃ is located in the second peripheral region 106, but the present invention does not take this as an example Limit, the diopter change curve may not include any peak or trough (for example, in a smooth ladder shape), as long as it meets the relationship of D ₂ >D ₁ >D ₃ . The range of the first peripheral area 105 may extend outward from the edge of the central area 104 by about 0.3-2.1 mm, or extend outward from the edge of the central area 104 to a position 1.50 ± 0.75 mm away from the central point 101 . The range of the second peripheral region 106 may extend outward from the edge of the first peripheral region 105 by about 0.15-3.75 mm (extend to the edge of the optical region 102), or extend outward from the edge of the first peripheral region 105 to the center Points 101 are located 3.00 ± 1.50 mm apart (extending to the edge of optical zone 102).

Referring now to FIG. 5 , in other specific embodiments, the diopter at different positions of the optical zone 102 changes continuously with the distance between the position and the center point of the lens, and includes peaks C ₁ , C ₂ , C ₃ and trough T ₁ , T ₂ , in this case, the first peripheral area 105 can be further divided into a B area and a C area, the B area surrounds the central area 104 (ie, the A area), and the C area surrounds the B area. Wherein, the peak C ₁ is located in area B, corresponding to a target diopter D ₂ ; the peak C ₂ is located in area C, corresponding to a target diopter D ₃ ; and the peak C ₃ is located in the second peripheral area 106 (that is, D area) , corresponding to a target diopter D ₄ . Preferably, the curve change of the diopter of the optical zone 102 meets one of the following relationships: (1) D ₂ >D ₁ ≧D ₃ >D ₄ , (2) D ₂ >D ₃ >D ₁ >D ₄ , or (3) D ₃ >D ₂ >D ₁ >D ₄ . The area B may extend outward from the edge of the central area 104 by about 0.15-1.2 mm, or extend outward from the edge of the central area 104 to a position 0.90 ± 0.45 from the central point 101 . The range of area C may extend outward from the edge of area B by about 0.15-1.8 mm (extending to the edge of the first peripheral area 105), or extend outward from the edge of area B to a distance of 1.50 ± 0.75 mm from the central point 101. location (extending to the edge of the first peripheral region 105).

Please refer to Fig. 1 and Fig. 5 at the same time, the optical zone 102 of the multifocal ophthalmic lens 100 of the present invention can also be designed to include the following four zones or be made up of the following four zones: A zone covers a peripheral area of the central point 101 and has a diopter D ₁ ; zone B, surrounds the A zone and has a diopter D ₂ ; C zone, surrounds the B zone and has a diopter D ₃ ; and D zone, surrounds the C zone and has a diopter D ₄ ; wherein D ₁ , D ₂ , D ₃ and D ₄ have one of the following relationships: D ₂ >D ₁ ≧D ₃ >D ₄ , D ₂ >D 3 >D ₁ > _{D 4 or} D ₃ >D ₂ >D ₁ > _D4 . The diopter change curve shown in FIG. 5 is specifically in line with D ₂ >D ₃ >D ₁ >D ₄ . Areas A to D can be configured as concentric circles similar to those shown in FIG. 3 , but not limited thereto. For example, they can also be in the shape of an ellipse. The area A can extend from the central point 101 to the edge of the multifocal ophthalmic lens 100 by 0.15-0.45 mm. For example, the area A can be roughly a circle with a radius of 0.25-0.3 mm. The range of area B may extend outward from the edge of area A by about 0.15-1.2 mm, or extend outward from the edge of area A to a position 0.90±0.45 from the central point 101 . The range of area C may extend outward from the edge of area B by about 0.15-1.8 mm, or extend outward from the edge of area B to a position 1.50 ± 0.75 from the central point 101 . The range of the D zone can be extended from the edge of the C zone by about 0.15 ~ 3.75mm (extending to the edge of the optical zone 102), or extending outward from the edge of the C zone to a distance of 3.00 ± 1.50 mm from the center point 101. location (extending to the edge of the optic zone 102).

In some specific embodiments, the above diopter change curve includes peaks C ₁ , C ₂ , C ₃ and troughs T ₁ , T ₂ , wherein peak C ₁ is located in area B, corresponding to a target diopter D ₂ , and peak C ₂ is located in C Area D corresponds to a target diopter D ₃ , and the peak C ₃ is located in area D corresponding to a target diopter D ₄ .

Please refer to FIG. 6 , which is a flowchart of a preparation method according to a specific embodiment of the present invention. The multifocal ophthalmic lens of the present invention can be prepared by methods known in the technical field, for example, a method comprising the steps of: preparing an ophthalmic lens forming mold, wherein the ophthalmic lens forming mold has a plurality of diopters designing (step S1), injecting lens forming material into the lens forming mold (step S2), and polymerizing the lens forming material to produce a multifocal ophthalmic lens (step S3).

Example 1: Multifocal ophthalmic lenses (1) ( D ₂ ＞D ₁ ≧D ₃ ＞D ₄ )

In this example, the actual situation is D ₂ >D ₁ >D ₃ >D ₄ . Referring to Fig. 8, the optical zone of the multifocal ophthalmic lens (1) is designed to include the A ^I zone (central zone), the B ^I zone, the C ^I zone and the D ^I zone. Among them, the range of A ^I area is from the center point of the lens to 0.25 mm from the center point of the lens, the range of B ^I area extends from the edge of A ^I area to the position 0.90 mm away from the lens center point, and the range of C ^I area is from B ^I area The edge of the C I extends to a position 1.40 mm from the center point of the lens, and the range of the D ^I zone extends from the edge of the C ^I zone to a position 3.00 mm from the center point of the lens (ie, the edge of the second peripheral zone 106). Set the target diopter D ₄ of the D ^I area to -2.50, the target diopter D ₁ of the A ^I area to -2.00, the target diopter D ₂ of the B ^I area to -1.75, the target diopter D ₃ of the C ^I area to -2.25, and more The diopter change curve of the optical zone of the focal ophthalmic lens (1) is shown in FIG. 8 .

Example 2: Multifocal ophthalmic lenses (2) ( D ₂ >D ₃ >D ₁ >D ₄ )

Referring to Fig. 9, the optical zone of the multifocal ophthalmic lens (2) is designed to include zone A ^II (central zone), zone B ^II , zone C ^II and zone D ^II . Among them, the range of A ^II zone is from the center point of the lens to 0.25 mm away from the lens center point, the range of B ^II zone extends from the edge of A ^II zone to the position 0.90 mm away from the lens center point, and the range of C ^II zone extends from B ^II zone The edge of C II extends to a position of 1.40 mm from the center point of the lens, and the range of the D ^II zone extends from the edge of the C ^II zone to a position of 3.00 mm from the center point of the lens (ie, the edge of the second peripheral zone 106). Set the target diopter D ₄ of the D ^II area to -4.00, the target diopter D ₁ of the A ^II area to -3.80, the target diopter D ₂ of the B ^II area to -3.30, and the target diopter D ₃ of the C ^II area to -3.50, and more The diopter change curve of the optical zone of the focal ophthalmic lens (2) is shown in FIG. 9 .

Example 3: Multifocal ophthalmic lenses (3) ( D ₃ >D ₂ >D ₁ >D ₄ )

Referring to Fig. 10, the optical zone of the multifocal ophthalmic lens (3) is designed to include zone A ^III (central zone), zone B ^III , zone C ^III and zone D ^III . Among them, the range of A ^III area is from the center point of the lens to 0.25 mm away from the lens center point, the range of B ^III area extends from the edge of A ^III area to the position 0.90 mm away from the lens center point, and the range of C ^III area is from B ^III area The edge of C III extends to a position 1.40 mm away from the center point of the lens, and the range of zone D ^III extends from the edge of zone C ^III to a position 3.00 mm away from the center point of the lens (ie, the edge of the second peripheral zone 106 ). Set the target diopter D ₄ of the D ^III area to -4.00, the target diopter D ₁ of the A ^III area to -3.80, the target diopter D ₂ of the B ^III area to -3.50, and the target diopter D ₃ of the C ^III area to -3.30, and more The diopter change curve of the optical zone of the focal ophthalmic lens (3) is shown in FIG. 10 .

Example 4: Wearing test

The vision measurement lenses include traditional multi-focal lenses (control group) as shown in Figure 6, and multi-focal ophthalmic lenses (1) to (3) of the present invention as mentioned above, where the diopter values of the tested lenses are configured as follows: 1. Control group lenses Diopter value configuration: A ⁰ zone > B ⁰ zone > C ⁰ zone; 2. Diopter value configuration of multi-focal ophthalmic lenses (1): B ^I zone > A ^I zone ≧ C ^I zone > D ^I zone; 3. Multiple The diopter value configuration of the focus ophthalmic lens (2): B ^II area > C ^II area > A ^II area > D ^II area; and 4. The diopter value configuration of the multi-focal ophthalmic lens (3): C ^III area > B ^III Zone > A ^III zone > D ^III zone.

Measure and observe 20 wearers. After wearing the different test lenses made by the control group and each group of embodiments, measure the wearer's near vision value (VAnear) and visual acuity when looking at near objects. The distance vision value (VAfar) for distant objects. The visual acuity values range from good to poor, marked with 1.5, 1.2, 1.0, 09, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, and 0.1, respectively. The wearing results are shown in Table 1 below.

Table 1: Lens Wearing Record Form

According to the wearing test results, in the near-distance visual acuity (VAnear) test of seeing near objects, the average visual acuity of the control group and the multifocal ophthalmic lens (1)-(3) of the present invention can reach more than 1.0, that is, in When looking at close-up objects, you can see objects clearly, and the gap between the two is very small.

But in the distance vision (VAfar) test of looking at distant objects, it can be clearly found that the average visual acuity value of the control group is about 0.9, that is, when looking at distant objects, there will be a blurred phenomenon; The average visual acuity of the ophthalmic lenses (1)-(3) is above 1.0, which means that the lens of Example 3 can still meet the requirements when seeing distant objects.

From the above results, it can be seen that the multifocal ophthalmic lens proposed by the present invention can effectively solve the problem of the lens in the prior art that is not clear when looking at the distance and looking at the near side alternately, resulting in uncomfortable wearing.

The above are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, that is, all equivalent changes and modifications made in accordance with the shape, structure, characteristics and spirit described in the patent scope of the present invention , should be included in the patent application scope of the present invention.

100: multi-focal ophthalmic lens 101: central point 102: optical zone 104: central zone 105: first peripheral zone 106: second peripheral zone 108: non-optical zone D ₁ ~ D ₄ : diopter C ₁ ~ C ₃ : peak T ₁ ~ T ₂ : Valleys A, B, C, D: Optical zones S1~S3: Step A, Zone ⁰ , Zone B ⁰ , Zone C ⁰ : Traditional multifocal ophthalmic lens optical zone A, Zone ^I , B ^I district, C ^I district, D ^I district: the multifocal ophthalmic lens optical zone A ^II district of example 1, B II district, C ^II district, ^{D II district} : the multifocal ophthalmic lens optical zone A ^III of example 2 Zone, B ^III zone, C ^III zone, D ^III zone: the optical zone of the multifocal ophthalmic lens of Example 3

[ Fig. 1 ] is a schematic diagram of a multifocal ophthalmic lens according to a specific embodiment of the present invention.

[ Fig. 2 ] is a schematic diagram showing the change of the diopter curve of the optical zone according to a specific embodiment of the present invention.

[ FIG. 3 ] is a schematic diagram of a multifocal ophthalmic lens according to a specific embodiment of the present invention.

[ FIG. 4 ] is a schematic diagram showing the change of the diopter curve of the optical zone according to a specific embodiment of the present invention.

[ FIG. 5 ] is a schematic diagram showing the change of the diopter curve of the optical zone according to a specific embodiment of the present invention.

[ FIG. 6 ] is a flowchart of a preparation method according to a specific embodiment of the present invention.

[FIG. 7] It is a schematic diagram showing the diopter configuration of a conventional multifocal ophthalmic lens.

[ FIG. 8 ] is a schematic diagram showing the change of the diopter curve of the optical zone according to a specific embodiment of the present invention.

[ FIG. 9 ] is a schematic diagram showing the change of the diopter curve of the optical zone according to another specific embodiment of the present invention.

[ FIG. 10 ] is a schematic diagram showing the curve change of the diopter in the optical zone according to yet another embodiment of the present invention.

Claims (10)

A multifocal ophthalmic lens, comprising: an optical zone; and a non-optical zone surrounding the optical zone; Wherein the diopter of different positions of the optical zone changes continuously with the distance between the position and the center point of the lens. The multifocal ophthalmic lens as claimed in claim 1, wherein the optical zone comprises: a central zone having a diopter D ₁ ; a first peripheral zone surrounding the central zone and having a diopter D ₂ ; and a second The peripheral area surrounds the first peripheral area and has a diopter D ₃ ; wherein D ₂ >D ₁ >D ₃ . The multifocal ophthalmic lens according to claim 1 or 2, wherein the continuous change includes two peaks C ₁ and C ₃ , the peak C ₁ corresponds to the diopter D ₂ , and the peak C ₃ corresponds to the diopter D ₃ . A multifocal ophthalmic lens comprising: an optical zone; and a non-optical zone surrounding the optical zone; wherein the optical zone includes: a central zone having a diopter D ₁ ; a first peripheral zone surrounding the central zone and has a diopter D ₂ ; and a second peripheral area surrounding the first peripheral area and having a diopter D ₃ ; wherein D ₂ >D ₁ >D ₃ . The multifocal ophthalmic lens as claimed in claim 4, wherein the central zone extends 0.15-0.45 mm outward from a center point of the multifocal ophthalmic lens. The multifocal ophthalmic lens as claimed in claim 4, wherein the first peripheral zone extends 0.3-2.1 mm outward from the edge of the central zone. The multifocal ophthalmic lens as claimed in claim 4, wherein the second peripheral zone extends 0.15 to 3.75 mm outward from the edge of the first peripheral zone. A multifocal ophthalmic lens, comprising: an optical zone; and a non-optical zone surrounding the optical zone; wherein the optical zone includes: A zone, having a diopter D ₁ ; B zone, surrounding the A zone and having a diopter D ₂ ; C zone, surrounding the B zone and having a diopter D ₃ ; and D zone, surrounding the C zone and having a diopter D ₄ ; wherein D ₁ , D ₂ , D ₃ and D ₄ have one of the following relationships : D ₂ >D ₁ ≧D ₃ >D ₄ , D ₂ >D ₃ >D ₁ >D ₄ or D ₃ >D ₂ >D ₁ >D ₄ . The multifocal ophthalmic lens according to claim 4 or 8, wherein the diopter of different positions of the optical zone changes continuously with the distance between the position and the lens center. The multifocal ophthalmic lens of claim 8, wherein the zone A encompasses the geometric center of the multifocal ophthalmic lens.

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