Ophthalmic lens and glasses with same

Abstract

The utility model relates to an ophthalmic lens and glasses with the same. An optical region of an ophthalmic lens includes a central region and a peripheral region, the peripheral region including a first region. The central region has a positive additional power with respect to a prescription power, and the first region has a negative additional power with respect to the prescription power; or the central region has a negative additional power with respect to a prescription power and the first region has a positive additional power with respect to the prescription power. Therefore, by providing the bidirectional coupling defocus lens which simultaneously provides positive additional power and negative additional power, a clinical myopia control effect which is superior to that of a defocus lens designed based on a myopia defocus theory can be generated.

Description

Technical Field

[0001] This utility model relates to the technical field of eyeglass lenses, specifically to an ophthalmic lens and eyeglasses having the same. Background Technology

[0002] Although the mechanisms of myopia occurrence and development are not yet clear, there are already many myopia control products on the market based on different theories or hypotheses, such as orthokeratology lenses, multifocal soft contact lenses, specially designed eyeglasses, and drugs, and their effectiveness in myopia control has been proven through clinical trials.

[0003] In recent years, various myopia management technologies have made new progress. Myopia prevention and control technologies need to be continuously updated based on the progress of scientific research. There are many different theories about the basic principles of myopia control. New myopia management technologies need to be scientifically verified through clinical trials to obtain evidence-based support before their effectiveness can be judged, and thus, the basic theories can be updated and iterated.

[0004] Common principles for myopia control include, for example, the myopia defocus theory and the retinal contrast theory. Currently, the most widely used is the myopia defocus theory; for example, multi-point defocus eyeglasses, orthokeratology lenses, defocus rigid contact lenses, and defocus soft contact lenses are all based on this principle. The myopia defocus theory can be described as follows.

[0005] Human eyes are born farsighted. During growth and development, the matching of axial length and refractive power causes the eye to tend towards emmetropia (normal vision). Any disruption to these highly coordinated ocular changes can lead to refractive errors. Animal experiments show that external visual stimuli play a regulatory role in eye growth and development. When a concave lens is placed in front of the eye to simulate farsighted defocus, the eyeball causes the choroid to thin and the retina to stretch backward in order to focus on the retina, resulting in axial elongation. Conversely, when a convex lens is placed in front of the eye to simulate myopic defocus, the choroid thickens and the retina is pushed forward, resulting in axial shortening. Axial length can not only be used to predict and characterize myopia, but excessive axial elongation itself is also a high-risk factor for high myopia. Utility Model Content

[0006] One objective of this invention is to provide a bidirectional coupling defocus lens that is different from defocus lenses designed based on myopia defocus theory and has a better effect than defocus lenses designed based on myopia defocus theory.

[0007] According to a first aspect of the present invention, an ophthalmic lens is provided, the optical region of which includes a central region and a peripheral region, the peripheral region including a first region, the central region having a positive additional power relative to the prescription power, and the first region having a negative additional power relative to the prescription power; or the central region having a negative additional power relative to the prescription power, and the first region having a positive additional power relative to the prescription power.

[0008] Optionally, the ratio of the absolute value weighted integral defocusing amount of the region with positive additional focal power in the optical region to the absolute value weighted integral defocusing amount of the region with negative additional focal power in the optical region is any ratio within the range of 0.40:0.60 to 0.60:0.40. The absolute value weighted integral defocusing amount is used to characterize the defocusing amount obtained by integrating the weighted absolute value of additional focal power over the region. The weight of the absolute value of additional focal power at a certain location in the region is positively correlated with the photoreceptor cell density on the retina corresponding to that location.

[0009] Optionally, the absolute value weighted product coke separation amount within the annular region is calculated according to the following formula.

[0010]

[0011] Where S(r1~r2) represents the absolute value weighted product focal power within an annular region with inner radius r1 and outer radius r2, r represents the vertical distance from a point on the lens to the lens central axis, k represents the weight of the corresponding radius r, and Add represents the additional focal power of the corresponding radius r.

[0012] Alternatively, k = ar 2 +br+c, where the value of a ranges from -0.20 to 0, the value of b ranges from -0.44 to 0, and the value of c ranges from 0.7 to 1.0.

[0013] Optionally, the center of the lens has a positive additional power relative to the prescription power, and the additional power at each location on the lens decreases as the distance from that location to the center of the lens increases; or the center of the lens has a negative additional power relative to the prescription power, and the additional power at each location on the lens increases as the distance from that location to the center of the lens increases.

[0014] Optionally, the peripheral area further includes a second area located between the central area and the first area. Both the central area and the first area have a fixed additional focal length, and the additional focal length of the second area gradually changes from the additional focal length of the central area to the additional focal length of the first area.

[0015] Optionally, the absolute value of the additional focal length of the central region is less than the absolute value of the additional focal length of the first region.

[0016] Optionally, the surrounding area may further include a third area having the prescription focal length.

[0017] Optionally, the peripheral region further includes a fourth region, the additional focal length of which is positive and negative the same as the additional focal length of the central region.

[0018] Optionally, the central region and at least a portion of the first region may coexist within a 4.5mm diameter area centered on the lens center.

[0019] Optionally, the total area of ​​regions with positive additional focal length is 30% to 70%, the total area of ​​regions with negative additional focal length is 30% to 70%, and the sum of the total area of ​​regions with positive additional focal length and the total area of ​​regions with negative additional focal length is less than or equal to 1.

[0020] Optionally, the absolute values ​​of both positive and negative additional focal lengths are greater than or equal to the first threshold and less than or equal to the second threshold.

[0021] Optionally, the first threshold is 0.5D, and / or the second threshold is 5D.

[0022] According to a second aspect of the present invention, an ophthalmic lens is provided, the power curve of which is configured to exhibit periodic variation. The power curve characterizes the power at different distances from the lens center, with positions at the same distance from the lens center having the same power. Within one variation cycle, the power curve includes a peak and a trough. The peak characterizes the maximum value of the positive additional power relative to the prescription power, and the trough characterizes the minimum value of the negative additional power relative to the prescription power. The power curve has the same peak and trough in different variation cycles; or the absolute values ​​of the additional power characterized by the peak and trough in different variation cycles are negatively correlated with the distance from the lens center; or the absolute value of the integral area of ​​the peak and trough in different variation cycles is negatively correlated with the distance from the lens center.

[0023] Optionally, the ratio of the absolute value weighted integral defocusing amount of the region with positive additional focal power within the optical region of the ophthalmic lens to the absolute value weighted integral defocusing amount of the region with negative additional focal power within the optical region is any ratio within the range of 0.40:0.60 to 0.60:0.40. The absolute value weighted integral defocusing amount is used to characterize the defocusing amount obtained by integrating the weighted absolute value of additional focal power within the region. The weight of the absolute value of additional focal power at a certain location within the region is positively correlated with the photoreceptor cell density on the retina corresponding to that location.

[0024] Optionally, the power at the center of the lens is one of the prescribed power, the peak, and the trough.

[0025] According to a third aspect of the present invention, eyeglasses are provided, wherein ophthalmic lenses according to the first or second aspect described above are provided on the eyeglasses.

[0026] Therefore, by providing a series of bidirectional coupled defocus lenses that simultaneously provide positive and negative additional focal power, this invention enables clinical myopia control effects that are superior to those of defocus lenses designed based on myopia defocus theory. Attached Figure Description

[0027] The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings, in which like reference numerals generally represent like parts.

[0028] Figure 1 A schematic diagram of the focal length at different distances from the center of the lens according to an embodiment of the present invention is shown.

[0029] Figure 2 A schematic diagram of the focal length at different distances from the center of the lens according to another embodiment of the present invention is shown.

[0030] Figure 3 A schematic diagram of the focal length at different distances from the center of the lens according to another embodiment of the present invention is shown.

[0031] Figure 4 A schematic diagram of the focal length at different distances from the center of the lens according to another embodiment of the present invention is shown.

[0032] Figure 5 A schematic diagram of the focal length at different distances from the center of the lens according to another embodiment of the present invention is shown. Detailed Implementation

[0033] Preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[0034] When designing defocused lenses based on the theory of myopia defocus, the central area of ​​the lens is usually designed as the myopia correction area, and the peripheral area of ​​the lens is designed as the myopia defocus area.

[0035] This type of design is based on the theory of peripheral defocus to control the development of myopia.

[0036] Professor Earl Smith III's series of experiments on rhesus monkeys revealed that hyperopic defocus of the retina induces an increase in axial length and myopia, while myopic defocus can inhibit axial growth. This means that if the defocus state in the periphery of the retina can be controlled to exhibit myopic defocus, it may be possible to slow the progression of myopia. Furthermore, Professor Earl Smith III's research found that the 10-20° periphery of the retina is the most sensitive to defocus and plays the most crucial role in the development of myopia.

[0037] Recently, researchers studied the sensitive points of myopic defocus using eye tracking combined with peripheral occlusion. They found that when using this method, the 6-10° peripheral range of the retina was more sensitive to myopic defocus.

[0038] However, this invention has found that when designing contact lenses or eyeglasses for myopia control, designing defocus in the peripheral area of ​​the lens is not the same as projecting defocus in the sensitive area of ​​the retina. Instead, the focus or defocus varies depending on factors such as the angle of incident light, the incident position, the incident wavelength, and the basic refractive power of the lens and the eyeball. This may be one of the reasons why some patients do not respond to a certain type of defocus lens, but can respond after changing the product.

[0039] In addition, some researchers have demonstrated through human trials that the effect of negative defocus on myopia progression may not be entirely consistent with previous understandings of defocus theory. Rather, if designed properly, negative defocus can also inhibit the progression of myopia. This does not conflict with previous theories of peripheral myopia defocus, accommodative lag, blurring, and contrast. Instead, it provides new data support, design ideas, and higher requirements for the fine design of products.

[0040] In this invention, correction, correction area, and prescription focal length are all used to describe the lens design features that focus light onto the retina to form a clear image.

[0041] In this invention, defocus and defocus are used to describe lens design features that prevent light from focusing on the retina and thus prevent the formation of a clear image.

[0042] In this invention, positive defocus, positive light addition, positive additional focal power, and myopic defocus design are all used to describe the lens design features that focus light in front of the retina to form myopic defocus.

[0043] In this invention, negative defocus, negative light addition, negative additional focal power, negative additional focal power, and hyperopic defocus design are all used to describe the lens design features that focus light behind the retina to form hyperopic defocus.

[0044] This invention discovers that when a defocused lens abandons using the central area to provide correction and instead sets the central area as the defocused area, it achieves excellent clinical myopia control results.

[0045] At the same time, setting a defocus in the peripheral area opposite to that in the central area can create a two-way coupled defocus effect. This not only ensures that the myopia control effect is not compromised, but also provides the wearer with good corrected visual acuity. Furthermore, good corrected visual acuity can even be achieved without the lens providing a myopia correction zone.

[0046] The underlying principle is the in-depth application of defocus theory, simultaneous vision principle, and competitive vision principle. Defocus in the central area can maximize the defocus area provided by the lens, thereby ensuring the myopia control effect. Meanwhile, the coupling effect provided by the peripheral defocus design allows the wearer's eyes to quickly adapt to the new vision after a short period of wear.

[0047] Clinically proven, whether it is central myopic defocus + peripheral hyperopic defocus, or vice versa, central hyperopic defocus + peripheral myopic defocus, both can achieve good corrective visual acuity and myopia control effects simultaneously.

[0048] In view of this, the present invention designs a series of bidirectional coupling defocus lenses. Theoretically, the bidirectional coupling defocus lenses of the present invention only need to provide a myopic defocus area and a hyperopic defocus area, without providing a myopic correction area.

[0049] Of course, considering the diversity of wearers, some wearers may have higher requirements for corrected vision. In order to improve wearing compliance, one or more myopia correction areas with the same prescription focal power can be set in the peripheral area of ​​the bidirectional coupling defocus lens.

[0050] Two typical bidirectional coupling defocus lenses can be referred to as CN and CF.

[0051] CN's optical design uses a central area of ​​the lens to receive positive light, while the outer perimeter of the lens receives negative light.

[0052] CF optical design uses a negative light-adding area in the center of the lens and a positive light-adding area in the outer perimeter outside the center.

[0053] This invention conducted a one-year follow-up observation on the myopia control effects of defocus lenses, CN lenses, and CF lenses designed based on myopia defocus theory. Among them, the defocus lens designed based on myopia defocus theory is a lens with only positive light addition, which can be called MI. The MI optical design has a myopia correction area in the central area of ​​the lens and two positive light addition ring areas on the periphery. This product has been widely recognized in the market.

[0054] The results showed that both CN and CF achieved better myopia control than lenses with only positive correction (MI). Specifically, MI had an annualized axial length increase of 0.11 mm, while CN and CF had an annualized axial length increase of only 0.07 mm, resulting in an average improvement in myopia control of 36%.

[0055] In addition, the clinical results of different groups also demonstrate that better myopia control can be achieved by rationally setting the positive and negative defocus positions, absolute additional power, and ratio of bidirectional coupling defocus lenses. Moreover, considering that the lack of a correction zone without any additional power would affect wearing compliance and thus the effectiveness of myopia control, various designs of bidirectional coupling defocus lenses can be selected for wearers with different adaptability.

[0056] The above experiments demonstrate that bidirectional coupling defocus lenses offer superior myopia control compared to defocus lenses designed based on myopia defocus theory. Therefore, this invention provides a series of bidirectional coupling defocus lens optical designs. It should be understood that although the underlying principles of bidirectional coupling defocus lens optical designs are not fully understood, there is no doubt that the optical signals provided by these lenses can effectively suppress axial elongation. These effective optical signals can be used as a reference for reverse engineering and designing various ophthalmic optical products.

[0057] The bidirectional coupling defocusing lens of this invention can be broadly divided into two types. One type is the CN, CF, and their variants mentioned above. The other type is a bidirectional coupling defocusing lens whose power changes periodically (e.g., sinusoidally) with respect to the distance from the lens center. The following description, in conjunction with the accompanying drawings, further illustrates these two types of bidirectional coupling defocusing lenses.

[0058] I. CN, CF and their variants

[0059] The optical zone of an ophthalmic lens is defined as the corresponding area through which external light passes into the pupil. For example, the optical zone of a contact lens can be defined as all the portion within 7 mm of the lens's center diameter, while the optical zone of a spectral lens can be defined as all the portion within 32 mm of the lens's center diameter.

[0060] The optical area of ​​an ophthalmic lens can be broadly divided into a central area and a peripheral area.

[0061] Ophthalmic lenses can be, but are not limited to, rigid contact lenses, soft contact lenses, and spectral lenses.

[0062] The surface of an ophthalmic lens can refer to either the outer surface (the surface furthest from the eye) or the inner surface (the surface closest to the eye). In other words, the central and peripheral areas can be located on either the outer or inner surface of the ophthalmic lens.

[0063] This invention does not impose any special limitations on the size of the central region. For example, the central region of the contact lens can refer to a circular area with a diameter of 2mm to 4.5mm centered on the lens center. All areas within the lens's optical region other than the central region can be considered as the peripheral region.

[0064] The surrounding area includes the first area. Both the central area and the first area have an additional focal length relative to the prescribed focal length. Furthermore, the additional focal length of the central area differs in sign from that of the first area.

[0065] In other words, if the central region has a positive additional focal length relative to the prescription focal length, then the first region has a negative additional focal length relative to the prescription focal length. Conversely, if the central region has a negative additional focal length relative to the prescription focal length, then the first region has a positive additional focal length relative to the prescription focal length.

[0066] The following provides an example illustrating the location, size ratio, and additional focal length of the positive and negative illumination areas.

[0067] In some embodiments, a central region and at least a portion of the first region should exist within a 4.5mm diameter area centered on the lens center, so that the positive and negative light-adding areas can stably enter the pupil simultaneously, thereby achieving better myopia control and myopia correction effects.

[0068] In some embodiments, the total area percentage of regions with positive additional focal length can be 30% to 70%, the total area percentage of regions with negative additional focal length can be 30% to 70%, and the sum of the total area percentages of regions with positive additional focal length and regions with negative additional focal length is less than or equal to 1. For example, the total area percentage of regions with negative additional focal length = 1 - the total area percentage of regions with positive additional focal length. For instance, if the proportion of positive additional light is 30%, the proportion of negative additional light can be 70%.

[0069] In some embodiments, the absolute value of the positive or negative additional focal length in the central region can account for 20% to 35% of the total focal length, while the absolute value of the opposite additional focal length in the peripheral region accounts for 65% to 80%. This method can relatively easily balance the reasonable allocation of the area and amount of positive and negative additional focal length.

[0070] Taking the annular region as an example, the integral defocusing amount can be calculated using the following formula:

[0071]

[0072] in:

[0073] S(r1~dr2) is the amount of coking within the annular region with an inner radius of r1 and an outer radius of r2;

[0074] r is the perpendicular distance from a point on the lens to the central axis of the lens;

[0075] Add is the additional focal length corresponding to radius r, which is a function of radius r;

[0076] In some embodiments, the ratio of the absolute value weighted integral defocusing amount of the region with positive additional focal power to the absolute value weighted integral defocusing amount of the region with negative additional focal power within the optical region can be 1:1 or close to 1:1, for example, 0.40:0.60, 0.45:0.55, 0.50:0.50, 0.55:0.45, 0.60:0.40, or any ratio within the range of 0.40:0.60 to 0.60:0.40. The absolute value weighted integral defocusing amount characterizes the defocusing amount obtained by integrating the weighted absolute value of additional focal power over the region, wherein the weight of the absolute value of additional focal power at a certain location within the region is positively correlated with the photoreceptor cell density on the retina corresponding to that location. That is, the weight value is determined with reference to the distribution of photoreceptor cells on the retina.

[0077] Taking an annular region as an example, the absolute value weighted product coke separation amount within the annular region can be calculated using the following formula.

[0078]

[0079] in:

[0080] S(r1~dr2) is the weighted product separation coke amount within the annular region with inner radius r1 and outer radius r2;

[0081] r is the perpendicular distance from a point on the lens to the central axis of the lens;

[0082] k is the weight corresponding to radius r, which is a function of radius r;

[0083] Add is the additional focal length corresponding to radius r, which is a function of radius r;

[0084] The weight k value can be referenced from the distribution of photoreceptor cells on the retina:

[0085] Based on the density distribution characteristics of photoreceptor cells (such as rod cells and cone cells) on the retina, it is known that the density of photoreceptor cells is greater and the sensitivity is stronger closer to the center of the retina. Therefore, in some embodiments, the following simplified formula for the weight k value can also be used:

[0086] k = ar 2 +br+c

[0087] Therefore, the formula for calculating the absolute value weighted product separation coke amount within the annular region shown above can be simplified to:

[0088]

[0089] in:

[0090] The value range of 'a' is -0.20 to 0, preferably -0.08 to 0;

[0091] The value of b ranges from -0.44 to 0, preferably from -0.28 to 0;

[0092] The value of c ranges from 0.7 to 1.0, with 0.87 to 1.0 being preferred.

[0093] The practical significance of this simplified formula is that it models the understanding that the sensitivity of the retina is stronger closer to the center, forming a simplified mathematical tool to guide defocus design. After extensive experimentation, a set of effective formula parameters and weighted product defocusing amount can be fixed. Based on this, the desired additional focal length at the center can be set, and the overall design can be calculated.

[0094] For example, in some embodiments, a bidirectional coupling defocusing lens with a central area of ​​4.5mm is designed. The weighting formula parameters that have been verified to be effective are set as a = -0.08, b = -0.20, c = 1, and the ratio of the absolute value weighted product defocusing amount of the region with positive additional focal power to the absolute value weighted product defocusing amount of the region with negative additional focal power in the optical region is 1:1.

[0095] In some embodiments, the absolute values ​​of both positive and negative added light in the entire positive and negative light-adding regions do not exceed 5D, preferably not exceeding 3D. Furthermore, the absolute values ​​of both positive and negative added light in the entire positive and negative light-adding regions can also be no less than a certain value (e.g., 0.50D) to achieve better myopia control by providing sufficient defocus. That is, the absolute values ​​of both positive and negative additional focal power are greater than or equal to a first threshold and less than or equal to a second threshold. The first threshold can be 0.50D, and the second threshold can be 5D.

[0096] Figure 1 A schematic diagram of the focal length at different distances from the center of the lens according to an embodiment of the present invention is shown.

[0097] Figure 1 The left-side view is equivalent to the CF mentioned above. Figure 1 The right-side view is equivalent to CN as mentioned above.

[0098] Figure 1 The focal length diagram shown can be considered as a global graduated focal length.

[0099] like Figure 1 As shown in the left-hand view, the center of the lens has a negative additional power relative to the prescription power, and the additional power at each location on the lens increases with the distance of that location from the center of the lens. Specifically, all regions with negative additional power relative to the prescription power can be considered the central region, and all regions with positive additional power relative to the prescription power can be considered the first region.

[0100] like Figure 1 As shown in the right-hand view, the center of the lens has a positive additional power relative to the prescription power, and the additional power at each location on the lens decreases as the distance from that location to the center of the lens increases. Specifically, all regions with negative additional power relative to the prescription power can be considered the central region, and all regions with positive additional power relative to the prescription power can be considered the first region.

[0101] In some embodiments, the peripheral region may further include a second region. The second region is located between the central region and the first region. Both the central region and the first region have a fixed additional focal length, and the additional focal length of the second region gradually changes from the additional focal length of the central region to the additional focal length of the first region.

[0102] For example, the central region can be a circular region with a diameter of 2mm centered on the center of the lens, the first region can be an annular region with a diameter of 6mm centered on the center of the lens, and the second region can be an annular region with a diameter of 2mm to 6mm centered on the center of the lens.

[0103] For example, the absolute value of the additional focal power in the central region can be less than the absolute value of the additional focal power in the first region. In this way, while achieving better myopia control using bidirectional coupling defocus, it can also ensure, to a certain extent, that the wearer achieves good corrected visual acuity, thereby improving wear compliance. For instance, the absolute value of the additional focal power in the central region can be 1D, and the absolute value of the additional focal power in the first region can be 3D.

[0104] Figure 2 A schematic diagram of the focal length at different distances from the center of the lens according to another embodiment of the present invention is shown.

[0105] like Figure 2 As shown, the optical area of ​​the lens can be divided into three regions from the inside out: the central region, the second region, and the first region.

[0106] More specifically, such as Figure 2 As shown in the left-hand view, the central region has a constant negative additional focal length relative to the prescription focal length. The first region has a constant positive additional focal length relative to the prescription focal length. The absolute value of the negative additional focal length in the central region is less than the absolute value of the positive additional focal length in the first region. The additional focal length in the second region gradually increases from the negative additional focal length in the central region to the positive additional focal length in the first region.

[0107] like Figure 2 As shown in the right-hand view, the central region has a constant positive additional focal length relative to the prescribed focal length. The first region has a constant negative additional focal length relative to the prescribed focal length. The absolute value of the positive additional focal length in the central region is less than the absolute value of the negative additional focal length in the first region. The additional focal length in the second region gradually decreases from the positive additional focal length in the central region to the negative additional focal length in the first region.

[0108] In some embodiments, the peripheral region may further include a third region. The third region has prescription focal length, meaning that the additional focal length of the third region relative to the prescription focal length is zero. The number of third regions may be one or more.

[0109] Figure 3 A schematic diagram of the focal length at different distances from the center of the lens according to another embodiment of the present invention is shown.

[0110] like Figure 3As shown in the left-hand view, the central region has a positive additional power relative to the prescription power. Furthermore, the additional power of the central region gradually decreases to zero as the distance from the lens center increases (i.e., from the inside out). The first region has a negative additional power relative to the prescription power. Furthermore, the additional power of the first region gradually decreases to a minimum negative additional power and then gradually increases to zero as the distance from the lens center increases (i.e., from the inside out). The third region is located on the side of the first region relatively far from the central region. The additional power of the third region relative to the prescription power is always zero.

[0111] like Figure 3 As shown in the right-hand view, the central region has a negative additional power relative to the prescription power. Furthermore, the additional power in the central region gradually increases to zero with increasing distance from the lens center (i.e., from the inside out). The first region has a positive additional power relative to the prescription power. Furthermore, the additional power in the first region gradually increases to a maximum positive additional power with increasing distance from the lens center (i.e., from the inside out) and then gradually decreases to zero. The third region is located on the side of the first region relatively far from the central region. The additional power of the third region relative to the prescription power is always zero.

[0112] In some embodiments, the peripheral region may further include a fourth region. The additional focal length of the fourth region is positive and negative the same as that of the central region. The number of fourth regions may be one or more. For example, the peripheral region may include, in addition to including at least one first region, any one or more combinations of second, third, and fourth regions.

[0113] Figure 4 A schematic diagram of the focal length at different distances from the center of the lens according to another embodiment of the present invention is shown.

[0114] See Figure 4 The optical regions of the lens include a central region, a first region, two third regions, and a fourth region. These regions are ordered from closest to furthest from the lens center (i.e., from inside to outside): central region, first region, third region, fourth region, and third region. For details regarding the additional focal length of each region, please refer to the relevant descriptions above.

[0115] Combine the text and images Figures 1 to 4 It can be seen that the additional focal length between different regions in this utility model is a smooth transition.

[0116] II. The focal power changes periodically with distance from the center of the lens.

[0117] The power curve of an ophthalmic lens can be configured to exhibit periodic changes.

[0118] A power curve is used to characterize the power at different distances from the center of the lens. Positions at the same distance from the center of the lens have the same power. Periodic variation can refer to, but is not limited to, sinusoidal variation. A power curve may include a peak and a trough within one period of variation. The peak is used to characterize the maximum value of the additional power with positive relative to the prescription power, and the trough is used to characterize the minimum value of the additional power with negative relative to the prescription power.

[0119] By configuring the power curve of ophthalmic lenses to change periodically, ophthalmic lenses have a very good extended depth of focus, which can provide good visual effects while achieving good myopia control.

[0120] In some embodiments, the focal length curve may have the same peaks and troughs in different variation periods.

[0121] In some embodiments, the absolute values ​​of the additional focal power represented by the peaks and troughs of the focal power curve in different periods of change are negatively correlated with the distance from the center of the lens.

[0122] In some embodiments, the absolute values ​​of the integral areas of the peaks and troughs of the power curve in different periods of change are negatively correlated with the distance from the center of the lens.

[0123] In some embodiments, the power at the center of the lens can be one of the prescription power, peak, or trough.

[0124] Figure 5 A schematic diagram of the focal length at different distances from the center of the lens according to another embodiment of the present invention is shown.

[0125] In this embodiment, the power curve of the ophthalmic lens can be configured as a global sine curve gradient.

[0126] Specifically, such as Figure 5 As shown in the left view, the power at the center of the lens is the peak, and it can be considered as a starting point, changing continuously with increasing distance from the lens center in a sinusoidal curve. For example... Figure 5 As shown in the right-hand view, the power at the center of the lens is the trough, and it can be continuously changed in a sinusoidal manner as the distance from the center of the lens increases, starting from the trough.

[0127] The ratio of the absolute value-weighted product defocusing amount of the region with positive additional focal power within the optical area of ​​an ophthalmic lens to the absolute value-weighted product defocusing amount of the region with negative additional focal power within the optical area can be any ratio within the range of 0.40:0.60 to 0.60:0.40. The absolute value-weighted product defocusing amount is used to characterize the defocusing amount obtained by integrating the weighted absolute value of additional focal power within the region. The weight of the absolute value of additional focal power at a certain location within the region is positively correlated with the photoreceptor cell density on the retina at that location.

[0128] The ophthalmic lens according to the present invention has been described in detail above with reference to the accompanying drawings.

[0129] In addition, this utility model also proposes a pair of eyeglasses, which are provided with the ophthalmic lenses described above.

[0130] Eyeglasses can be, but are not limited to, rigid contact lenses, soft contact lenses, and eyeglasses.

[0131] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. An ophthalmic lens, characterized in that, The optical area of ​​the ophthalmic lens includes a central area and a peripheral area. The surrounding area includes the first area. The central region has a positive additional focal length relative to the prescription focal length, and the first region has a negative additional focal length relative to the prescription focal length; or The central region has a negative additional focal length relative to the prescription focal length, and the first region has a positive additional focal length relative to the prescription focal length. The total area of ​​regions with positive additional focal length accounts for 30% to 70%. The total area of ​​regions with negative additional focal length accounts for 30% to 70%. The sum of the total area percentage of regions with positive additional focal length and the total area percentage of regions with negative additional focal length is less than or equal to 1.

2. The ophthalmic lens according to claim 1, characterized in that, The ratio of the absolute value weighted integral defocusing amount of the region with positive additional focal power within the optical region to the absolute value weighted integral defocusing amount of the region with negative additional focal power within the optical region is any ratio within the range of 0.40:0.60 to 0.60:0.

40. The absolute value weighted integral defocusing amount is used to characterize the defocusing amount obtained by integrating the weighted absolute value of additional focal power within the region. The weight of the absolute value of additional focal power at a certain location within the region is positively correlated with the photoreceptor cell density on the retina corresponding to that location.

3. The ophthalmic lens according to claim 2, characterized in that, Calculate the absolute value weighted product coke separation amount within the annular region using the following formula. Where S(r1~r2) represents the absolute value weighted product focal power within an annular region with inner radius r1 and outer radius r2, r represents the vertical distance from a point on the lens to the lens central axis, k represents the weight of the corresponding radius r, and Add represents the additional focal power of the corresponding radius r.

4. The ophthalmic lens according to claim 3, characterized in that, k=ar 2 +br+c Where a ranges from -0.20 to 0, b ranges from -0.44 to 0, and c ranges from 0.7 to 1.

0.

5. The ophthalmic lens according to claim 1, characterized in that, The center of the lens has a positive additional power relative to the prescription power, and the additional power at each location on the lens decreases as the distance from that location to the center of the lens increases; or The center of the lens has a negative additional power relative to the prescription power, and the additional power at each location on the lens increases with the distance of that location from the center of the lens.

6. The ophthalmic lens according to claim 1, characterized in that, The surrounding area also includes a second area. The second region is located between the central region and the first region. Both the central region and the first region have a fixed additional focal length, and the additional focal length of the second region gradually changes from the additional focal length of the central region to the additional focal length of the first region.

7. The ophthalmic lens according to claim 6, characterized in that, The absolute value of the additional focal length in the central region is less than the absolute value of the additional focal length in the first region.

8. The ophthalmic lens according to claim 1, characterized in that, The surrounding area also includes a third area. The third region has the prescribed focal length.

9. The ophthalmic lens according to claim 1, characterized in that, The surrounding area also includes a fourth area. The additional focal length of the fourth region is the same as that of the additional focal length of the central region.

10. The ophthalmic lens according to claim 1, characterized in that, The central region and at least a portion of the first region exist within a 4.5mm diameter area centered on the lens center.

11. The ophthalmic lens according to any one of claims 1 to 10, characterized in that, The absolute values ​​of both positive and negative additional focal lengths are greater than or equal to the first threshold and less than or equal to the second threshold.

12. The ophthalmic lens according to claim 11, characterized in that, The first threshold is 0.5D, and / or The second threshold is 5D.

13. An ophthalmic lens, characterized in that, Its focal length curve is configured to exhibit periodic changes. The power curve is used to characterize the power at different distances from the center of the lens. Positions at the same distance from the center of the lens have the same power. The focal length curve includes one peak and one trough within one cycle of change. The peaks represent the maximum values ​​of additional focal lengths with positive relative to the prescription focal length, and the troughs represent the minimum values ​​of additional focal lengths with negative relative to the prescription focal length. The focal length curve has the same peaks and troughs in different variation periods; or The absolute values ​​of the additional focal length represented by the peaks and troughs of the focal length curve in different variation periods are negatively correlated with the distance from the center of the lens. or The absolute values ​​of the integral areas of the peaks and troughs of the power curve in different periods of change are negatively correlated with the distance from the center of the lens.

14. The ophthalmic lens according to claim 13, characterized in that, The ratio of the absolute value weighted integral defocusing amount of the region with positive additional focal power within the optical region of the ophthalmic lens to the absolute value weighted integral defocusing amount of the region with negative additional focal power within the optical region is any ratio within the range of 0.40:0.60 to 0.60:0.

40. The absolute value weighted integral defocusing amount is used to characterize the defocusing amount obtained by integrating the weighted absolute value of additional focal power within the region. The weight of the absolute value of additional focal power at a certain location within the region is positively correlated with the photoreceptor cell density on the retina corresponding to that location.

15. The ophthalmic lens according to claim 13, characterized in that, The power at the center of the lens is one of the prescribed power, the peak, and the trough.

16. A pair of eyeglasses, characterized in that, The eyeglasses are provided with an ophthalmic lens according to any one of claims 1-15.

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