Ophthalmic lens and glasses with same
By designing a bidirectional coupled defocus lens, the two-way coupling effect is achieved using the opposite additional focus of the central area and the peripheral area, the problem of poor myopia control effect in the prior art is solved, and better clinical myopia control effect and good corrected vision are achieved.
Patent Information
- Application Number
- CN202411911121.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2025-03-14
AI Technical Summary
Existing defocus lenses designed based on myopia defocus theory cannot effectively control myopia in some cases, and some patients do not respond after wearing it, which requires more effective myopia control methods.
A bidirectional coupled defocus lens is designed, with an optical region including a central region and a peripheral region, which has a positive or negative additional focus relative to the prescription focus, an opposite additional focus relative to the prescription focus, and a proportional configuration of absolute value weighted integral defocus amount is achieved to achieve a bidirectional coupling effect.
The clinical myopia control effect is achieved better than the defocus lens designed based on myopia defocus theory, with an annualized axial growth of 36%, while providing good corrected vision.
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Figure CN119620435A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of eyeglasses, and in particular, to an ophthalmic lens and eyeglasses having the same. Background Art
[0003] Although the mechanism of the occurrence and development of myopia is still unclear, there are already many myopia control products on the market based on different theories or hypotheses, such as orthokeratology lenses, multifocal soft corneal contact lenses, specially designed frame glasses and drugs, etc., and their effectiveness in myopia control has been proven through clinical trial results.
[0004] In recent years, there have been new developments in various myopia management technologies. Myopia prevention and control technologies must 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 must be scientifically verified through clinical trials and obtain evidence-based basis to determine whether they are effective and to form updates and iterations of basic theories.
[0005] Common principles of myopia control include, for example, myopia defocus theory, retinal contrast theory, etc. The most widely used one is the myopia defocus theory, such as multi-point defocus frame glasses, orthokeratology lenses, defocus hard contact lenses, defocus soft contact lenses, etc., which are all based on this principle. The myopia defocus theory can be described as follows.
[0006] Human eyes are hyperopic at birth. During the growth and development process, the matching of axial length and refractive power of the eye makes the eye tend to be emmetropia. Any interference with these highly coordinated eye changes will lead to refractive errors. Animal experiments have shown that external visual stimulation regulates the growth and development of the eye. When a concave lens is placed in front of the eyes to simulate hyperopic defocus, the eye will cause the choroid to thin and the retina to stretch backwards in order to make the focal plane fall on the retina, resulting in elongation of the axial length. When a convex lens is placed in front of the eyes to simulate myopic defocus, the choroid will thicken and the retina will be pushed forward, causing the axial length to shorten. The length of the axial length can not only be used to predict and characterize myopia, but the excessive growth of the axial length itself is also one of the high-risk factors for high myopia. Summary of the invention
[0007] One purpose of the present disclosure is to provide a bidirectional coupling defocus lens which is different from the defocus lens designed based on the myopia defocus theory and has better effect than the defocus lens designed based on the myopia defocus theory.
[0008] According to a first aspect of the present disclosure, an ophthalmic lens is provided, wherein the optical zone of the ophthalmic lens includes a central zone and a peripheral zone, wherein the peripheral zone includes a first zone, wherein the central zone has a positive additional focal power relative to the prescription focal power, and the first zone has a negative additional focal power relative to the prescription focal power; or wherein the central zone has a negative additional focal power relative to the prescription focal power, and the first zone has a positive additional focal power relative to the prescription focal power.
[0009] Optionally, the ratio of the absolute value weighted product defocus amount of the area with positive additional focal power within the optical area to the absolute value weighted product defocus amount of the area with negative additional focal power within the optical area is any ratio within the range of 0.40:0.60 to 0.60:0.40, and the absolute value weighted product defocus amount is used to characterize the defocus amount obtained by integrating the weighted absolute value of the additional focal power within the area, wherein the weight of the absolute value of the additional focal power at a certain position within the area is positively correlated with the density of photoreceptor cells on the retina corresponding to the position.
[0010] Optionally, the absolute value weighted product defocusing amount in the annular region is calculated according to the following formula:
[0011]
[0012] Among them, S(r1~r2) represents the absolute value weighted product defocusing amount in the ring area with inner radius r1 and outer radius r2, r represents the vertical distance from a point on the lens to the central axis of the lens, k represents the weight corresponding to the radius r, and Add represents the additional focal length corresponding to the radius r.
[0013] Optionally, 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.
[0014] Optionally, the center of the lens has a positive additional power relative to the prescription power, and the additional power at each position on the lens decreases as the distance of the position from 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 position on the lens increases as the distance of the position from the center of the lens increases.
[0015] Optionally, the peripheral area also includes a second area, which is located between the central area and the first area, and 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.
[0016] Optionally, an absolute value of the additional focal power of the central area is smaller than an absolute value of the additional focal power of the first area.
[0017] Optionally, the peripheral area also includes a third area, and the third area has the prescription focal power.
[0018] Optionally, the peripheral area further includes a fourth area, and the additional focal length of the fourth area is the same as that of the central area in terms of positive and negative.
[0019] Optionally, the central area and at least part of the first area exist simultaneously in an area within a range of 4.5 mm in diameter with the center of the lens as the center.
[0020] Optionally, the total area of the areas with positive additional focal power accounts for 30% to 70%, the total area of the areas with negative additional focal power accounts for 30% to 70%, and the sum of the total area of the areas with positive additional focal power and the total area of the areas with negative additional focal power is less than or equal to 1.
[0021] Optionally, the absolute value of the positive additional focal power and the absolute value of the negative additional focal power are both greater than or equal to a first threshold and less than or equal to a second threshold.
[0022] Optionally, the first threshold is 0.5D, and / or the second threshold is 5D.
[0023] According to a second aspect of the present disclosure, there is provided an ophthalmic lens, whose focal power curve is configured to present periodic changes, the focal power curve is used to characterize the focal power at different distances from the center of the lens, and the positions at the same distance from the center of the lens have the same focal power, the focal power curve includes a peak and a trough within one variation cycle, the peak is used to characterize the maximum value of the positive additional focal power relative to the prescription focal power, and the trough is used to characterize the minimum value of the negative additional focal power relative to the prescription focal power, the focal power curve has the same peak and trough in different variation cycles; or the absolute value of the additional focal power represented by the peak and trough of the focal power curve in different variation cycles is negatively correlated with the distance from the center of the lens; or the absolute value of the integrated area of the peak and trough of the focal power curve in different variation cycles is negatively correlated with the distance from the center of the lens.
[0024] Optionally, the ratio of the absolute value weighted product defocus amount of the area with positive additional focal power within the optical zone of the ophthalmic lens to the absolute value weighted product defocus amount of the area with negative additional focal power within the optical zone is any ratio within the range of 0.40:0.60 to 0.60:0.40, and the absolute value weighted product defocus amount is used to characterize the defocus amount obtained by integrating the weighted absolute value of the additional focal power within the area, wherein the weight of the absolute value of the additional focal power at a certain position within the area is positively correlated with the density of photoreceptor cells on the retina corresponding to the position.
[0025] Optionally, the focal length at the center of the lens is one of the prescription focal length, the wave peak, and the wave trough.
[0026] According to a third aspect of the present disclosure, a pair of glasses is provided, on which the ophthalmic lens according to the first aspect or the second aspect above is provided.
[0027] Therefore, the present disclosure provides a series of bidirectionally coupled defocus lenses that provide both positive and negative additional power, so as to produce a clinical myopia control effect that is superior to the defocus lenses designed based on myopia defocus theory. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] The above and other objects, features and advantages of the present disclosure will become more apparent through a more detailed description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components in the exemplary embodiments of the present disclosure.
[0029] Figure 1 A schematic diagram of the focal power at different distances from the center of the lens according to an embodiment of the present disclosure is shown.
[0030] Figure 2 A schematic diagram showing the focal powers at different distances from the center of the lens according to another embodiment of the present disclosure is shown.
[0031] Figure 3 A schematic diagram showing the focal powers at different distances from the center of the lens according to another embodiment of the present disclosure is shown.
[0032] Figure 4 A schematic diagram showing the focal powers at different distances from the center of the lens according to another embodiment of the present disclosure is shown.
[0033] Figure 5 A schematic diagram showing the focal powers at different distances from the center of the lens according to another embodiment of the present disclosure is shown. DETAILED DESCRIPTION
[0034] The preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.
[0035] When designing a defocus lens based on the myopia defocus theory, the central area of the lens is usually designed as a myopia correction area, and the peripheral area of the lens is designed as a myopia defocus area.
[0036] This type of design is derived from the theory of peripheral defocus theory to control the development of myopia.
[0037] Professor Earl Smith III conducted a series of experiments on rhesus monkeys and found that retinal hyperopic defocus can induce the growth of the eye axis and myopia, while retinal myopic defocus can inhibit the growth of the eye axis, which means that if the defocus state of the retina can be controlled to make it myopic, it is possible to slow down the development of myopia. In addition, Professor Earl Smith III's further research found that the 10-20° area of the retina's periphery is the most sensitive to defocus and plays the most critical role in the development of myopia.
[0038] Recently, researchers have studied the sensitive points of myopic defocus by combining eye tracking with peripheral occlusion, and found that when this method is used, the 6 to 10° range corresponding to the peripheral retina is more sensitive to myopic defocus.
[0039] However, the present disclosure has discovered that when designing contact lenses or frame lenses for myopia control, designing defocus in the peripheral area of the lens is not equivalent to projecting defocus on the sensitive area of the retina. Instead, the focus or defocus is on different positions of the retina depending on many factors such as the angle of the incident light, the incident position, the incident wavelength, 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 defocus lens when wearing it, but respond after changing the product.
[0040] In addition, some researchers have proved through human experiments that the effect of negative defocus on the progression of myopia may not be exactly the same as the previous understanding of defocus theory. Instead, as long as it is properly designed, negative defocus can also have an inhibitory effect on the progression of myopia. This does not conflict with the previous peripheral myopia defocus theory, accommodation lag theory, blur theory, and contrast theory. Instead, it provides new data support, design ideas and higher requirements for the fine design of products.
[0041] In this disclosure, correction, correction zone, and prescription power are all used to describe the design features of the lens that focus light on the retina to form a clear image.
[0042] In the present disclosure, defocus and defocus are used to describe the lens design features that cause light to not be focused on the retina and not form a clear image.
[0043] In the present disclosure, positive defocus, positive addition, positive addition, positive additional focal length, 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.
[0044] In the present disclosure, negative defocus, negative addition, negative addition, negative addition power, and hyperopic defocus design are all used to describe the lens design features that focus light on the retina to form hyperopic defocus.
[0045] The present disclosure has discovered that when a defocus lens abandons the use of the central area to provide correction and instead sets the central area as a defocus area, an excellent clinical myopia control effect is achieved.
[0046] At the same time, setting the defocus in the peripheral area opposite to that in the central area can form a two-way coupled defocus effect, which not only does not lose the myopia control effect, but also provides the wearer with good corrected vision. Furthermore, even the lens does not need to provide a myopia correction area to achieve good corrected vision.
[0047] The principle behind this is the in-depth application of defocus theory, simultaneous vision principle and competing vision principle. The defocus in the central area can maximize the defocus area provided by the lens, thereby ensuring the myopia control effect. The coupling effect provided by the peripheral opposite defocus design allows the wearer's eyes to quickly adapt to the new vision after a short period of wearing.
[0048] Clinically proven, whether it is central myopic defocus + peripheral hyperopic defocus, or vice versa, central hyperopic defocus + peripheral myopic defocus, both can achieve good corrected vision and myopia control effects.
[0049] In view of this, the present disclosure designs a series of bidirectionally coupled defocus lenses. The bidirectionally coupled defocus lenses of the present disclosure theoretically only need to provide a myopic defocus area and a hyperopic defocus area, but do not need to provide a myopia correction area.
[0050] Of course, considering the diversity of the wearer population, some wearers may have higher requirements for corrected vision. In order to improve wearing compliance, one or more myopia correction areas consistent with the prescription focal length can also be set in the peripheral area of the bidirectionally coupled defocus lens.
[0051] Two typical bidirectional coupling defocus lenses can be called CN and CF.
[0052] The CN optical design is that the center area of the lens has positive light addition, and the peripheral area outside the center area of the lens has negative light addition.
[0053] The CF optical design is that the center area of the lens is negative light addition, and the peripheral area outside the center area of the lens is positive light addition.
[0054] The present disclosure conducted a one-year follow-up observation on the myopia control effects of defocus lenses, CN and CF designed based on myopia defocus theory. Among them, the defocus lenses designed based on myopia defocus theory are lenses with only positive light addition, which can be called MI. The MI optical design is that the central area of the lens is the myopia correction area, and the periphery has two positive light ring areas. This product has been widely recognized by the market.
[0055] The results showed that both CN and CF achieved better myopia control than lenses with only positive addition (i.e. MI). Specifically, the annual axial length growth of MI was 0.11mm, while the annual axial length growth of CN and CF was only 0.07mm, and the average control effect was improved by 36%.
[0056] In addition, the performance of different clinical groups also shows that better myopia control effects can be achieved by reasonably setting the positive and negative defocus positions, absolute addition amounts, and ratios of the two-way coupled defocus lenses. Moreover, considering that if no correction area without any additional focal power is designed, it will affect the compliance of wearing and thus affect the effect of myopia control, various designs of two-way coupled defocus lenses can be selected for wearers with different adaptability.
[0057] The above experiments show that the myopia control effect of the bidirectional coupled defocus lens is better than the defocus lens designed based on the myopia defocus theory. Therefore, the present disclosure provides a series of bidirectional coupled defocus lens optical designs. It should be known that although the principle behind the bidirectional coupled defocus lens optical design is not completely clear, there is no doubt that the optical signal provided by this type of lens can effectively inhibit the growth of the eye axis, and the effective optical signal can be used to reversely calculate and design various ophthalmic optical products.
[0058] The bidirectional coupling defocus lens disclosed in the present invention can be generally divided into two types. One is the CN, CF and their variant forms mentioned above. The other is a bidirectional coupling defocus lens whose focal power changes periodically (such as sinusoidally) with the distance from the center of the lens. The above two types of bidirectional coupling defocus lenses are further described below in conjunction with the accompanying drawings.
[0059] 1. CN, CF and their variants
[0060] The optical zone of an ophthalmic lens is defined as the corresponding area that allows external light passing through the area to enter the pupil. For example, the optical zone of a contact lens can be defined as all parts within the center diameter of 7mm, while the optical zone of a frame lens can be defined as all parts within the center diameter of 32mm.
[0061] The optical zone of an ophthalmic lens can generally be divided into a central zone and a peripheral zone.
[0062] Ophthalmic lenses can be, but are not limited to, hard contact lenses, soft contact lenses, and frame lenses.
[0063] The surface of the ophthalmic lens may refer to the outer surface (i.e., the surface away from the eye) or the inner surface (i.e., the surface close to the eye). In other words, the central area and the peripheral area may be arranged on the outer surface of the ophthalmic lens or on the inner surface of the ophthalmic lens.
[0064] The present disclosure does not impose any special restrictions on the size of the central area. For example, the central area of the contact lens may refer to a circular area with a diameter of 2 mm to 4.5 mm, with the center of the lens as the center. All areas in the optical area of the lens except the central area may be regarded as the peripheral area.
[0065] The peripheral area includes the first area. The focal powers of the central area and the first area both have an additional focal power relative to the prescription focal power. Moreover, the additional focal power of the central area is different from the additional focal power of the first area in positive and negative directions.
[0066] That is, if the central area has a positive additional power relative to the prescription power, the first area has a negative additional power relative to the prescription power. If the central area has a negative additional power relative to the prescription power, the first area has a positive additional power relative to the prescription power.
[0067] The following is an exemplary description of the position, size ratio and additional focal length of the positive and negative light addition areas.
[0068] In some embodiments, the area within a diameter of 4.5 mm with the center of the lens as the center should have both a central area and at least a portion of the first area, so that the positive and negative light-added areas can stably enter the pupil at the same time, thereby achieving better myopia control and myopia correction effects.
[0069] In some embodiments, the total area ratio of the area with positive additional focal power may be 30% to 70%, the total area ratio of the area with negative additional focal power may be 30% to 70%, and the sum of the total area ratio of the area with positive additional focal power and the total area ratio of the area with negative additional focal power is less than or equal to 1. Exemplarily, the total area ratio of the area with negative additional focal power=1-the total area ratio of the area with positive additional focal power. For example, if the ratio of positive light addition is 30%, the ratio of negative light addition may be 70%.
[0070] In some embodiments, the absolute value product of the positive or negative additional focal power in the central area may account for 20% to 35% of the defocusing amount, that is, the absolute value product of the opposite additional focal power in the peripheral area may account for 65% to 80%. This method can easily balance the area and additional focal amount of positive and negative additional focal power.
[0071] Taking the annular region as an example, the integral defocusing amount can be calculated as follows:
[0072]
[0073] in:
[0074] S(r1~dr2) is the integral defocusing amount in the annular region with an inner radius of r1 and an outer radius of r2;
[0075] r is the vertical distance from a point on the lens to the central axis of the lens;
[0076] Add is the additional focal length corresponding to radius r, which is a function of radius r;
[0077] In some embodiments, the ratio of the absolute value weighted product defocus of the area with positive additional focal power in the optical area to the absolute value weighted product defocus of the area with negative additional focal power can be 1:1 or close to 1:1, such as 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 product defocus is used to characterize the defocus obtained by integrating the weighted absolute value of the additional focal power in the area, wherein the weight of the absolute value of the additional focal power at a certain position in the area is positively correlated with the density of photoreceptor cells on the retina corresponding to the position. In other words, the weight value is determined with reference to the distribution of photoreceptor cells on the retina.
[0078] Taking the annular region as an example, the absolute value weighted product defocusing amount in the annular region can be calculated according to the following formula.
[0079]
[0080] in:
[0081] S(r1~dr2) is the weighted product defocusing amount in the annular region with an inner radius of r1 and an outer radius of r2;
[0082] r is the vertical distance from a point on the lens to the central axis of the lens;
[0083] k is the weight corresponding to radius r, which is a function of radius r;
[0084] Add is the additional focal length corresponding to radius r, which is a function of radius r;
[0085] Among them, the weight k value can refer to the distribution of photoreceptor cells on the retina:
[0086] According to the density distribution characteristics of photoreceptor cells (such as rods and cones) on the retina, the closer to the center of the retina, the greater the density of photoreceptor cells, the stronger the sensitivity. Therefore, in some embodiments, the following simplified weight k value formula can also be used:
[0087] k = ar 2 +br+c
[0088] Therefore, the calculation formula of the absolute value weighted product defocusing amount in the ring area shown above can be simplified to:
[0089]
[0090] in:
[0091] The value range of a is -0.20 to 0, preferably -0.08 to 0;
[0092] The value range of b is -0.44 to 0, preferably -0.28 to 0;
[0093] The value range of c is 0.7 to 1.0, preferably 0.87 to 1.0.
[0094] The practical significance of this simplified formula is to model the understanding that the closer the retina is to the center, the stronger its sensitivity is, forming a simplified mathematical tool to guide the defocus design. After a large number of experiments, a set of effective formula parameters and weighted product defocusing can be fixed, and the expected center additional focal length can be set on this basis to calculate the overall design.
[0095] For example, in some embodiments, a two-way coupled defocus lens with a central area of 4.5 mm is designed, and the proven effective weighted formula parameters are set to a=-0.08, b=-0.20, c=1, and the ratio of the absolute value weighted product defocusing amount of the area with positive additional focal power in the optical area to the absolute value weighted product defocusing amount of the area with negative additional focal power is 1:1.
[0096] In some embodiments, in the entire positive and negative light addition area, the absolute value of the positive and negative light addition does not exceed 5D, preferably does not exceed 3D. Moreover, in the entire positive and negative light addition area, the absolute value of the positive and negative light addition may also be not less than a certain value (such as 0.50D) to achieve a better myopia control effect by providing a sufficient amount of defocus. That is to say, the absolute value of the positive additional focal length and the absolute value of the negative additional focal length are both greater than or equal to the first threshold, and less than or equal to the second threshold. Among them, the first threshold can be 0.50D, and the second threshold can be 5D.
[0097] Figure 1 A schematic diagram of the focal power at different distances from the center of the lens according to an embodiment of the present disclosure is shown.
[0098] Figure 1 The left view is equivalent to the CF mentioned above. Figure 1 The right side view is equivalent to the CN mentioned above.
[0099] Figure 1 The focal power diagram shown can be regarded as a full-range progressive zoom.
[0100] like Figure 1 As shown in the left view, the center of the lens has a negative additional power relative to the prescription power, and the additional power of each position on the lens increases as the distance of the position from the center of the lens increases. Among them, all areas with negative additional power relative to the prescription power can be regarded as the central area, and all areas with positive additional power relative to the prescription power can be regarded as the first area.
[0101] like Figure 1 As shown in the right view, the center of the lens has a positive additional power relative to the prescription power, and the additional power of each position on the lens decreases as the distance of the position from the center of the lens increases. Among them, all areas with negative additional power relative to the prescription power can be regarded as the central area, and all areas with positive additional power relative to the prescription power can be regarded as the first area.
[0102] In some embodiments, the peripheral area may further include a second area. The second area is located between the central area and the first area. The central area and the first area both 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.
[0103] Exemplarily, the central area can be a circular area with a diameter range of 2 mm and the center of the lens as the center, the first area can be an annular area with a diameter range of 6 mm and the center of the lens as the center, and the second area can be an annular area with a diameter range of 2 mm to 6 mm and the center of the lens as the center.
[0104] For example, the absolute value of the additional focal length of the central area may be smaller than the absolute value of the additional focal length of the first area. In this way, while achieving a better myopia control effect by utilizing bidirectional coupling defocus, it can ensure to a certain extent that the wearer obtains a good corrected vision, thereby improving wearing compliance. For example, the absolute value of the additional focal length of the central area may be 1D, and the absolute value of the additional focal length of the first area may be 3D.
[0105] Figure 2 A schematic diagram showing the focal powers at different distances from the center of the lens according to another embodiment of the present disclosure is shown.
[0106] like Figure 2 As shown, the optical zone of the lens can be divided into three zones from inside to outside, namely, a central zone, a second zone and a first zone.
[0107] More specifically, if Figure 2 As shown in the left view, the central area has a fixed negative additional focal power relative to the prescription focal power. The first area has a fixed positive additional focal power relative to the prescription focal power. The absolute value of the negative additional focal power of the central area is less than the absolute value of the positive additional focal power of the first area. The additional focal power of the second area gradually increases from the negative additional focal power of the central area to the positive additional focal power of the first area.
[0108] like Figure 2 As shown in the right side view, the central area has a fixed positive additional focal power relative to the prescription focal power. The first area has a fixed negative additional focal power relative to the prescription focal power. The absolute value of the positive additional focal power of the central area is smaller than the absolute value of the negative additional focal power of the first area. The additional focal power of the second area gradually decreases from the positive additional focal power of the central area to the negative additional focal power of the first area.
[0109] In some embodiments, the peripheral area may further include a third area. The third area has a prescription focal length, that is, the additional focal length of the third area relative to the prescription focal length is zero. The number of the third area may be one or more.
[0110] Figure 3 A schematic diagram showing the focal powers at different distances from the center of the lens according to another embodiment of the present disclosure is shown.
[0111] like Figure 3As shown in the left view, the central area has a positive additional focal power relative to the prescribed focal power. Moreover, the additional focal power of the central area can gradually decrease to zero as the distance from the center of the lens increases (i.e., from the inside to the outside). The first area has a negative additional focal power relative to the prescribed focal power. Moreover, the additional focal power of the first area can gradually decrease to a minimum negative additional focal power and then gradually increase to zero as the distance from the center of the lens increases (i.e., from the inside to the outside). The third area is located on the side of the first area relatively far from the central area. The additional focal power of the third area relative to the prescribed focal power is always zero.
[0112] like Figure 3 As shown in the right view, the central area has a negative additional focal power relative to the prescribed focal power. Moreover, the additional focal power of the central area can gradually increase to zero as the distance from the center of the lens increases (i.e., from the inside to the outside). The first area has a positive additional focal power relative to the prescribed focal power. Moreover, the additional focal power of the first area can gradually increase to a maximum positive additional focal power and then gradually decrease to zero as the distance from the center of the lens increases (i.e., from the inside to the outside). The third area is located on the side of the first area relatively far from the central area. The additional focal power of the third area relative to the prescribed focal power is always zero.
[0113] In some embodiments, the peripheral area may further include a fourth area. The additional focal length of the fourth area is the same as that of the central area. The number of the fourth areas may be one or more. Exemplarily, the peripheral area may also include any one or more combinations of the second area, the third area, the third area, and the fourth area on the basis of including at least one first area.
[0114] Figure 4 A schematic diagram showing the focal powers at different distances from the center of the lens according to another embodiment of the present disclosure is shown.
[0115] See also Figure 4 , the optical area of the lens includes a central area, a first area, two third areas and a fourth area. Among them, in order from near to far (i.e. from inside to outside) from the center of the lens, they are the central area, the first area, the third area, the fourth area, and the third area. For the additional focal power of each area, please refer to the relevant description above.
[0116] Combined with the above text Figures 1 to 4 It can be seen that the additional focal lengths between different areas in the present disclosure are all smoothly transitioned.
[0117] 2. The focal power changes periodically with the distance from the center of the lens
[0118] The power curve of an ophthalmic lens may be configured to exhibit periodic variations.
[0119] 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. Periodic changes may refer to, but are not limited to, sinusoidal changes. The power curve may include a peak and a trough within a change cycle. The peak is used to characterize the maximum value of the positive additional power relative to the prescribed power, and the trough is used to characterize the minimum value of the negative additional power relative to the prescribed power.
[0120] By configuring the focal power curve of the ophthalmic lens to change periodically, the ophthalmic lens has a very good extended depth of focus, so that better myopia control effect can be achieved while providing better visual effects.
[0121] In some embodiments, the power curve may have the same peaks and valleys in different variation periods.
[0122] In some embodiments, the absolute value of the additional focal power represented by the peaks and troughs of the focal power curve in different variation cycles is negatively correlated with the distance from the center of the lens.
[0123] In some embodiments, the absolute values of the integrated areas of the peaks and troughs of the power curve in different change cycles are negatively correlated with the distance from the center of the lens.
[0124] In some embodiments, the focal length at the center of the lens can be one of a prescription focal length, a peak, and a valley.
[0125] Figure 5 A schematic diagram showing the focal powers at different distances from the center of the lens according to another embodiment of the present disclosure is shown.
[0126] In this embodiment, the focal power curve of the ophthalmic lens can be configured as a full-range sinusoidal progressive focus.
[0127] Specifically, Figure 5 As shown in the left view, the focal power at the center of the lens is the peak, and can change continuously in a sinusoidal manner with the distance from the center of the lens increasing, starting from the peak. Figure 5 As shown in the right side view, the focal length at the center of the lens is a trough, and can change continuously in a sinusoidal manner with the trough as the starting position as the distance from the center of the lens increases.
[0128] The ratio of the absolute value weighted product defocusing amount of the area with positive additional power in the optical area of the ophthalmic lens to the absolute value weighted product defocusing amount of the area with negative additional power in the optical area can be any ratio in 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 the additional power in the area, wherein the weight of the absolute value of the additional power at a certain position in the area is positively correlated with the photoreceptor cell density on the retina corresponding to the position.
[0129] The ophthalmic lens according to the present disclosure has been described above in detail with reference to the accompanying drawings.
[0130] In addition, the present disclosure also proposes a pair of glasses, on which the above-described ophthalmic lenses are provided.
[0131] The glasses may be, but are not limited to, hard contact lenses, soft contact lenses, and frame glasses.
[0132] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.
Claims
1. An ophthalmic lens, wherein the optical zone of the ophthalmic lens comprises a central zone and a peripheral zone, The peripheral area includes a first area, The central zone has a positive add power relative to the prescription power and the first zone has a negative add power relative to the prescription power; or The central zone has a negative add power relative to a prescription power, and the first zone has a positive add power relative to the prescription power.
2. The ophthalmic lens according to claim 1, wherein: The ratio of the absolute value weighted product defocus amount of the area with positive additional focal power within the optical area to the absolute value weighted product defocus amount of the area with negative additional focal power within the optical area is any ratio within the range of 0.40:0.60 to 0.60:0.40, and the absolute value weighted product defocus amount is used to characterize the defocus amount obtained by integrating the weighted absolute value of the additional focal power within the area, wherein the weight of the absolute value of the additional focal power at a certain position within the area is positively correlated with the density of photoreceptor cells on the retina corresponding to the position.
3. The ophthalmic lens according to claim 2, wherein: The absolute value weighted product defocusing amount in the ring area is calculated according to the following formula: Among them, S(r1~r2) represents the absolute value weighted product defocusing amount in the ring area with inner radius r1 and outer radius r2, r represents the vertical distance from a point on the lens to the central axis of the lens, k represents the weight corresponding to the radius r, and Add represents the additional focal length corresponding to the radius r.
4. The ophthalmic lens according to claim 3, wherein: k=ar 2 +br+c Among them, the value range of a is -0.20~0, the value range of b is -0.44~0, and the value range of c is 0.7~1.
0.
5. The ophthalmic lens according to claim 1, wherein: The center of the lens has a positive add power relative to the prescribed power, and the add power at each location on the lens decreases as the distance from the center of the lens increases; or The center of the lens has a negative additional power relative to the prescribed power, and the additional power at each position on the lens increases as the distance from the center of the lens increases.
6. The ophthalmic lens according to claim 1, wherein: The peripheral area also includes a second area, The second area is located between the central area and the first area, The central area and the first area both have fixed additional focal powers, and the additional focal power of the second area gradually changes from the additional focal power of the central area to the additional focal power of the first area.
7. The ophthalmic lens according to claim 6, wherein: An absolute value of the additional power of the central area is smaller than an absolute value of the additional power of the first area.
8. The ophthalmic lens according to claim 1, wherein: The peripheral area also includes a third area, The third zone has the prescription power.
9. The ophthalmic lens according to claim 1, wherein: The peripheral area also includes a fourth area, The additional focal power of the fourth area is the same as the additional focal power of the central area in positive and negative directions.
10. The ophthalmic lens according to claim 1, wherein: The central area and at least part of the first area exist in an area within a range of 4.5 mm in diameter with the center of the lens as the center.
11. The ophthalmic lens according to claim 1, wherein: The total area of the area with positive additional power accounts for 30% to 70%. The total area of the region with negative additional power accounts for 30% to 70%. The sum of the total area ratio of the regions with positive additional power and the total area ratio of the regions with negative additional power is less than or equal to 1.
12. The ophthalmic lens according to any one of claims 1 to 11, wherein: The absolute value of the positive additional power and the absolute value of the negative additional power are both greater than or equal to the first threshold and less than or equal to the second threshold.
13. The ophthalmic lens according to claim 12, wherein: The first threshold is 0.5D, and / or The second threshold is 5D.
14. An ophthalmic lens, the power curve of which is configured to exhibit periodic changes, The focal power curve is used to characterize the focal power at different distances from the center of the lens. Positions at the same distance from the center of the lens have the same focal power. The focal power curve includes a peak and a trough in one variation cycle. The peak is used to characterize the maximum value of the positive additional power relative to the prescribed power, and the trough is used to characterize the minimum value of the negative additional power relative to the prescribed power. The focal power curve has the same peaks and troughs in different change periods; or The absolute value of the additional focal power represented by the peaks and troughs of the focal power curve in different change cycles is negatively correlated with the distance from the center of the lens; or The absolute values of the integrated areas of the crests and troughs of the focal power curve in different change cycles are negatively correlated with the distance from the center of the lens.
15. The ophthalmic lens according to claim 14, wherein: The ratio of the absolute value weighted product defocus amount of the area with positive additional focal power within the optical area of the ophthalmic lens to the absolute value weighted product defocus amount of the area with negative additional focal power within the optical area is any ratio within the range of 0.40:0.60 to 0.60:0.40, and the absolute value weighted product defocus amount is used to characterize the defocus amount obtained by integrating the weighted absolute value of the additional focal power within the area, wherein the weight of the absolute value of the additional focal power at a certain position within the area is positively correlated with the density of photoreceptor cells on the retina corresponding to the position.
16. The ophthalmic lens of claim 14, wherein: The focal power at the center of the lens is one of the prescription focal power, the wave peak, and the wave trough.
17. A pair of glasses, wherein: An ophthalmic lens according to any one of claims 1 to 16 is arranged on the spectacles.