Method for detecting divergent rupture points and lens matching method

Abstract

The invention provides a method for detecting a divergence rupture point and a lens matching method. The method comprises the following steps: setting corresponding targets for the left eye and the right eye of a user at initial positions respectively; moving the target corresponding to the left eye to the left and moving the target corresponding to the right eye to the right until the targets corresponding to the left eye and the right eye of the user are separated or broken from the image fusion state and become a broken state; after one or more of preset relaxation actions are executed and kept for a preset duration, if targets corresponding to the left eye and the right eye of the user in the visual field of the user are changed into an image fusion state from a rupture state at the current divergence rupture point, detection continues; if the targets corresponding to the left eye and the right eye of the user are still in a rupture state at the current divergence rupture point, executing a stop operation; the current divergent rupture point is updated; and stopping the operation, and determining the current divergent rupture point obtained by the last detection as the ultimate divergent rupture point, thereby detecting the more stable ultimate divergent rupture point.

Description

Technical Field

[0001] This invention belongs to the field of optometry technology, specifically relating to a method for detecting divergence breakpoints and a method for fitting eyeglasses. Background Technology

[0002] Currently, the early onset and high incidence of myopia has become a major concern of our time, and how to effectively prevent and control myopia has become a significant challenge for society today.

[0003] Studies have found that near work involves contraction of the medial rectus muscle and inward turning of the eyes, along with ciliary muscle tension and lens convexity. Prolonged ciliary muscle tension or even spasm can cause eye strain, leading to the onset and progression of myopia. Correspondingly, inducing the visual axes of both eyes to diverge beyond parallelism, and diligently detecting the maximum divergence breakpoint (the ultimate divergence breakpoint), and applying this to the fitting of prism-guided composite lenses, can liberate the eyes from excessive near work, which is of great significance for myopia prevention and control. Summary of the Invention

[0004] This invention provides a method for detecting divergence breakpoints and a method for fitting eyeglasses, which is used to identify divergence breakpoints in myopic users, characterize the eye position through the divergence breakpoints, and thus facilitate eyeglass fitting based on the divergence breakpoints.

[0005] A first aspect of this application provides a method for detecting divergent break points, comprising the following steps: S1. Set corresponding targets for the user's left and right eyes at the initial position, wherein the targets corresponding to the user's left and right eyes are isolated and can move independently to the left and right. At the initial position, the targets corresponding to the user's left and right eyes are in a fusion state. In the fusion state, the targets corresponding to the user's left and right eyes in the user's field of vision will be fused into a single image. S2. Move the target corresponding to the left eye to the left and the target corresponding to the right eye to the right, and cause the visual axes of the user's eyes to diverge until the targets corresponding to the user's left and right eyes are separated or broken from the fused state and become broken; when the broken state occurs, mark the position of the target corresponding to the user's left and right eyes as the current divergence break point; S3. After performing one or more preset relaxation actions and maintaining them for a preset duration, if the target corresponding to the user's left and right eyes in the user's field of vision changes from a broken state to a fused state at the current divergence break point, proceed with S4 sequentially; if the target corresponding to the user's left and right eyes is still in a broken state at the current divergence break point, proceed with S5. S4. Continue to move the target corresponding to the left eye to the left and the target corresponding to the right eye to the right, further increasing the distance between the two targets and causing the user's visual axes to diverge until the targets corresponding to the user's left and right eyes in the user's field of vision are separated or broken again from the fused state and become a broken state; update the current divergence break point with the position of the target corresponding to the user's left and right eyes when the broken state occurs again, and return to execute S3; S5. Stop the operation and determine the current divergence break point obtained from the last detection as the final divergence break point.

[0006] In one possible implementation, the preset relaxation action includes: Reciprocating movement: The user continuously gazes at the target corresponding to the left and right eyes, which reciprocates between the initial position and the current divergence break point or the first target point, wherein the first target point is a point set within a preset radius of the current divergence break point; Fixed gaze action: The user continuously gazes at the target corresponding to the user's left and right eyes at the current divergence breakpoint or the first target point; Visual distance adjustment action: The user continuously gazes at the target corresponding to the user's left and right eyes located at the current divergence break point or the first target point, and repeatedly adjusts the distance between the user's eyes and the target corresponding to the user's left and right eyes; Target-changing action: Set multiple second target points within a preset radius of the current divergence break point, and make the user continuously focus on different target points among the multiple second target points.

[0007] A second aspect of this application provides a method for fitting lenses, which uses any current divergence break point or ultimate divergence break point measured above as a characteristic value to determine the prism parameters of a near-field or far-field prism composite lens; and customizes a prism composite lens made of one or more of prisms, spherical lenses and cylindrical lenses according to a preset parameter matching rule.

[0008] In one possible implementation, the prism parameters for near-field or far-field prism composite lenses are determined using the following formula: X=B L –B0 D ±ΔY±ΔZ; Where X is the prism parameter, and the unit is prism diopters; B L The current divergence breakpoint or ultimate divergence breakpoint detected by the user at a viewing distance L, in prism diopters; B0 D The current divergence breakpoint or ultimate divergence breakpoint for a specified population at a specified viewing distance D, or a fixed value selected within the range of 0 to 7▽; ΔY is the correction value between the detection range L and the specified range D; ΔZ is the comprehensive correction value for the prism parameters other than the divergence break point.

[0009] In one possible implementation, the prism parameters of the near-field prism compound are determined using the following formula: X=B L –B0 D +A±ΔY±ΔZ; Where A is the angle between the first viewing distance and the specified viewing distance D, that is, the angle of rotation of the user's eyes between the two viewing distances, and the unit is prism diopters ▽.

[0010] In one possible implementation, the prism parameters for the near-field prism compound lens are determined using a formula design: X=B NL+M ±ΔZ; Where NL is the user's second viewing distance; M is the distance increment that satisfies NL+M > NL; B NL+M This refers to the user's current or ultimate divergence breakpoint at a viewing distance of NL+M, expressed in prism diopters (▽).

[0011] In one possible implementation, the preset parameter matching rule is as follows: the myopia spherical power of the near-field prism composite lens is 1.00 to 2.50D lower than that of the distance-field prism composite lens, and the prism power of the near-field prism composite lens is 3 to 9 prism powers higher than that of the distance-field prism composite lens.

[0012] In one possible implementation, when the user's myopia degrees are inconsistent between the two eyes, more prisms are allocated to the eye with higher myopia and less prisms are allocated to the eye with lower myopia.

[0013] In one possible implementation, the prism-transparent composite lens is two independent pairs of glasses adapted to near-distance and far-distance vision scenarios respectively, or a pair of glasses with a double-layered lens structure, or a pair of glasses with the lower half of the lens used for near vision and the upper half used for far vision.

[0014] The beneficial effects of the present invention: The present invention provides a method for detecting divergence breakpoints and a method for fitting glasses, comprising: S1, setting corresponding targets for the user's left and right eyes at an initial position, wherein the targets corresponding to the user's left and right eyes are isolated and can be moved independently left and right, and at the initial position the targets corresponding to the user's left and right eyes are in a fusion state, in which the targets corresponding to the left and right eyes in the user's field of vision will be fused into a single image; S2, moving the target corresponding to the left eye to the left and the target corresponding to the right eye to the right, thereby causing the user's visual axes to diverge until the targets corresponding to the user's left and right eyes are separated from the fusion state or break into a break state; when a break state occurs, the position of the target corresponding to the user's left and right eyes is marked as the current divergence breakpoint; S3, performing one or more preset relaxation actions and maintaining the preset relaxation action. After a set time, if the targets corresponding to the user's left and right eyes in the user's field of vision change from a broken state to a fused state at the current divergence break point, execute S4 sequentially; if the targets corresponding to the user's left and right eyes are still in a broken state at the current divergence break point, execute S5; S4: Continue to move the target corresponding to the left eye to the left and the target corresponding to the right eye to the right, continuing to increase the distance between the two targets, and causing the user's visual axes to diverge, until the targets corresponding to the user's left and right eyes in the user's field of vision are separated again from a fused state or become broken again; update the current divergence break point with the position of the targets corresponding to the user's left and right eyes when the broken state occurs again, and return to execute S3; S5: Stop the operation, and determine the current divergence break point obtained by the last detection as the final divergence break point. Since the size of the divergence break point can reflect the eye position, the final divergence break point obtained by this application is more stable than the initial divergence break point, thus helping to improve the accuracy and effect of lens fitting.

[0015] Of course, implementing any product or method of this application does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other embodiments can be obtained based on these drawings.

[0017] Figure 1 This application provides a schematic diagram of the eye position for people who are less prone to myopia; Figure 2 This application provides a schematic diagram of an exophoric position that is particularly prone to myopia; Figure 3This application provides a schematic diagram of eye position for near and far vision in an orthostatic eye; Figure 4 This application provides a schematic diagram of eye position in near and far vision states for esophoria; Figure 5 This application provides a schematic diagram of an eye position after prism correction; Figure 6 This application provides a vertical line diagram for measuring the rupture point; Figure 7 This application provides a schematic diagram illustrating the principle that seeing a target through a prism with both eyes is equivalent to seeing two virtual images; Figure 8 This application provides a schematic diagram of the diplopia effect after binocular tearing. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art based on this application are within the scope of protection of this application.

[0019] To facilitate understanding of the solutions in this application, the terms that may be used in this application will first be explained: The initial divergence break point is the divergence break point detected for the first time after the induced visual axis divergence. The divergence break point measured by traditional detection methods is the initial divergence break point. Intermediate divergence breakpoints are detected by increasing the duration of the user's viewing or fixation on the target after the initial breakpoint is detected, or by relaxing the ciliary muscle through various methods such as reciprocating movement of the target. The previously detected divergence breakpoints will then re-merge, causing the detected divergence breakpoints to be continuously broken, moved backward, and enlarged. The breakpoints that appear one after another after the initial breakpoint are intermediate divergence breakpoints. The ultimate divergence break point is the point at which the number of intermediate break points increases until it is considered relatively stable and difficult to break through further. In practice, the final few intermediate divergence break points with smaller error ranges can also be considered the ultimate break point. While the ultimate break point is relatively stable and not easily changed, and is a characteristic parameter that varies from person to person, it can change with variations in divergence ability, but it will not increase indefinitely.

[0020] Eye position refers to the ideal relaxed eye position, which is the position of the eyeballs when the eyes are closed without tension or spasm of the ciliary muscle.

[0021] The original relaxed eye position is the relaxed eye position in the most original and ideal state where the ciliary muscle is not under tension or spasm, or is not affected in any way. This eye position is not easily changed over time, and all intraocular and extraocular muscles are in a relaxed state under physiological tension.

[0022] The divergence break point is often considered a reflection of the eye's ability to separate, a functional issue. However, this value actually reflects more structural information. First, the degree of divergence differs due to the different initial relaxed eye positions. Second, the degree of divergence is influenced by differences in separation ability. For example, considering esophoria, orthosis, and exophoria, assuming the eye size and extraocular muscle strength are the same, the divergence break point will be smallest in esophoria, larger in orthosis, and largest in exophoria. This is because under the same torque, the three eye positions will rotate at the same angle, naturally resulting in different divergence break points—a necessary consequence of structure. If the eye positions are the same but the strength of the lateral rectus muscles differs, the stronger eye will experience a greater torque, resulting in a larger rotation angle from the relaxed position. This falls under the category of function or ability.

[0023] To illustrate the solution of this application, the principle of the solution of this application will be explained below.

[0024] Studies have found that when methods are used to induce continuous divergence of the visual axes of both eyes, maximizing their divergence, the lateral rectus muscle is in a state of contraction or tension. This causes the lens to become thinner and flatter, resulting in the elimination of ciliary muscle fatigue and improved vision. This internal force generated by the ciliary muscle, caused by the contraction of the lateral rectus muscle and leading to a thinner and flatter lens, is defined as the "tension" or "relaxation force" of the ciliary muscle. It is an antagonistic force to the ciliary muscle's tension or contractile force, and they can counteract each other. This method can eliminate ciliary muscle tension or spasm, thus having a good effect on myopia control. However, there are two traditional methods for inducing divergence of the visual axes and reflecting the degree of divergence: one is to use a phoropter to detect the divergence breakpoint (also known as the divergence breakpoint) in the horizontal convergence range at a distance; the other is to use a synoptophore to detect the separation value in the fusion range. The disadvantages of these two methods are that for people with normal binocular vision, the results measured at different times may vary; and if multiple measurements are taken, the results may also differ each time. Therefore, completely relaxing the ciliary muscle and finding the ultimate divergence break point is of great significance for people with myopia.

[0025] Meanwhile, research has found that eye position is a crucial factor in whether a person is prone to myopia. Students who frequently use their eyes for close work but do not develop myopia—those less prone to myopia—share a common characteristic: their eye position is often characterized by relatively large esophoria, known as moderate to high esophoria. Figure 1 As shown, when looking at near objects, these eyes rotate inward from a relaxed position. According to the theory of the three-linkage mechanism of accommodation, convergence, and pupil, the contraction of the medial rectus muscle triggers the contraction and tension of the ciliary muscle. However, because the angle φ of inward rotation is not large, the ciliary muscle contraction force caused by the inward rotation is very small, so even after prolonged close-up work, the eyes do not become very tired. At the same time, when looking at distant objects, the eyes rotate outward from a relaxed position. The angle β of outward rotation is appropriate, which causes the ciliary muscle to produce counter-tension, that is, to generate tension or relaxation force that is the opposite of the contraction force, thus quickly eliminating or offsetting near-vision fatigue and achieving balance. This type of person, who is less prone to myopia, currently accounts for about 10-20% of the population in China. For example, in exophoria, when looking at distant objects, both eyes need to turn inward by an angle β from a relaxed position, and the inward turning angle φ is even greater when looking at near objects. Thus, whether looking at near or distant objects, both eyes are under the influence of ciliary muscle contraction, with no opportunity to generate ciliary muscle relaxation. Therefore, children with this eye position often develop myopia early, and once they do, their myopia tends to progress rapidly each year, resulting in a higher degree of myopia in adulthood. Figure 2 As shown, conventional methods are completely ineffective, and this type of myopia is often referred to as hereditary myopia. The greater the exophoria, the stronger the medial rectus muscle, and the more severe the development of myopia. From a physics perspective, in moderate esophoria, the work done by the ciliary muscle tension is small, and the work done by the opposing tension-relaxation force can cancel it out. This balanced state prevents myopia. However, in exophoria, whether looking at near or far objects, the ciliary muscle tension is constantly working, and its value is very large. The tension-relaxation force never has a chance to work, ultimately leading to eyeball deformation and premature onset and progression of myopia. Based on the above logic, if... Figure 3 As shown, orthotic eye is also a relatively easy eye position for myopia. It's merely a relaxation when looking at distant objects; there's still no opportunity for a counter-tension or relaxation force to occur that opposes the ciliary muscle's tension. This is a state of imbalance, meaning that the lateral rectus muscle in both exophoria and orthotic eyes has almost no chance to contract and is in a state of disuse. Only esophoria is a relatively reasonable and healthy eye position. Figure 4As shown, when looking at near objects, the contraction of the medial rectus muscle triggers the contraction of the ciliary muscle; when looking at distant objects, the contraction of the lateral rectus muscle triggers the ciliary muscle to generate opposing tension. The contraction and relaxation of the ciliary muscle are similar to the compression and stretching of a spring. However, even mild esophoria, with a significant increase in near-vision activity, cannot completely offset the eye strain caused by ciliary muscle tension from excessive near work, leading to myopia. But the age of onset of myopia will be later, and its progression will be slower. When, as the degree of esophoria increases, the effects of ciliary muscle contraction and relaxation caused by near and distant work can be offset, this is the kind of eye we refer to as the group less prone to myopia. Furthermore, hereditary myopia does not inherit myopia itself, but rather eye position. That is, eye positions that are indistinguishable externally, showing different degrees of esophoria, are the outward manifestation of the hereditary characteristics of myopia. By correcting, intervening in, or changing eye position, hereditary myopia problems that are difficult to address with conventional methods can be resolved with very ideal results. As mentioned earlier regarding exophoria, only by inducing the visual axes of both eyes to diverge beyond parallel can the ciliary muscle generate a reverse tension or relaxation force. This force can quickly make the lens thinner than when the ciliary muscle is relaxed, thereby rapidly eliminating ciliary muscle tension and fatigue caused by near vision and effectively controlling myopia. Although eye position, like height and appearance, is different for everyone, this characteristic is often overlooked when prescribing glasses.

[0026] Furthermore, the principle of eyeglass prescription in this application can be referenced as follows: Taking a user with exophoria as an example, after measuring the user's ultimate break point, it is often larger or even much larger than the ultimate break point of people who are not prone to myopia. The excess can be absorbed by a prism. For example, if the ultimate break point of people who are not prone to myopia is considered to be 5 prism diopters per eye (5▽), and the measured ultimate break point of a myopic child is 12▽ (prism diopters) per eye, then a 7▽ (12▽-5▽=7▽) bottom-in prism can be used to replace the inward turning of both eyes. This corrected eye position is equivalent to simulating an exophoria that is prone to myopia into a larger esophoria that is not prone to myopia. Figure 5 As shown, after prism correction, the eyes turn outward when looking at distant objects, but the divergence breakpoint is significantly reduced, equivalent to the divergence breakpoint value of people who are not prone to myopia, thus preventing myopia from occurring or progressing. Furthermore, in situations involving prolonged close-up work such as reading and writing, a pair of prism-lens composite lenses with appropriate parameters, which can convert near vision to distance vision, can be added. This makes it easier to achieve a much greater amount of distance vision than near vision in close-up environments, thus making myopia reversal possible.

[0027] A first aspect of this application provides a method for detecting divergent break points, comprising the following steps: S1. Set corresponding targets for the user's left and right eyes at the initial position, wherein the targets corresponding to the user's left and right eyes are isolated and can move independently to the left and right. At the initial position, the targets corresponding to the user's left and right eyes are in a fusion state. In the fusion state, the targets corresponding to the user's left and right eyes in the user's field of vision will be fused into a single image. S2. Move the target corresponding to the left eye to the left and the target corresponding to the right eye to the right, and cause the visual axes of the user's eyes to diverge until the targets corresponding to the user's left and right eyes are separated or broken from the fused state and become broken; when the broken state occurs, mark the position of the target corresponding to the user's left and right eyes as the current divergence break point; S3. After performing one or more preset relaxation actions and maintaining them for a preset duration, if the target corresponding to the user's left and right eyes in the user's field of vision changes from a broken state to a fused state at the current divergence break point, proceed with S4 sequentially; if the target corresponding to the user's left and right eyes is still in a broken state at the current divergence break point, proceed with S5. S4. Continue to move the target corresponding to the left eye to the left and the target corresponding to the right eye to the right, further increasing the distance between the two targets and causing the user's visual axes to diverge until the targets corresponding to the user's left and right eyes in the user's field of vision are separated or broken again from the fused state and become a broken state; update the current divergence break point with the position of the target corresponding to the user's left and right eyes when the broken state occurs again, and return to execute S3; S5. Stop the operation and determine the current divergence break point obtained from the last detection as the final divergence break point.

[0028] Regarding step S1, specifically, the targets set for the user's left and right eyes can be visual objects or landscapes, and can be real objects or virtual images. The targets corresponding to the user's left and right eyes can be the same or have the same subject. In actual use, the initial position of the targets for the left and right eyes is a position where the two eyes can easily fuse images. When the user's left and right eyes focus on a target respectively, since the two targets are at the same height, the instinct of binoculars to merge images can fuse the two targets into one. In actual use, the user's feedback can be used to determine whether fusion has occurred.

[0029] Regarding step S2, specifically, when the left-eye target is moved to the left from the first initial position and the right-eye target is moved to the right from the first initial position, the distance, speed, and time of their movement can be the same or different. When the image after fusion of the user's two eyes separates or breaks down, this can be defined as a breakup. A breakup means that the user's two eyes cannot fuse the left and right eye targets into a single visual image. The current divergence value of the user's two eyes is recorded to obtain the current divergence breakup point. The position corresponding to the separation or breakup of the fusion state is marked as the current divergence breakup point of the user's two eyes, in prism diopters (▽) or diopters (︒).

[0030] Regarding step S3, the specific preset duration can be set according to the actual situation. It can refer to a few minutes, tens of minutes, or several hours, or it can be tens of minutes per day for several months or years. If the user's eyes are at the current divergence breakpoint, and the eyes change from a broken state to a fused state, proceed sequentially to step S4; if the user's eyes remain broken at the current divergence breakpoint and cannot change to a fused state, proceed to step S5. In one possible implementation, a point is set within a preset radius (±7▽) of the divergence breakpoint, referred to as the first target point. The preset relaxation actions include: a reciprocating movement action: the user continuously gazes at the target corresponding to the left and right eyes, moving back and forth between the initial position and the current divergence breakpoint or the first target point, wherein the first target point is a point set within the preset radius of the current divergence breakpoint; a fixed gaze action: the user continuously gazes at the target corresponding to the user's left and right eyes located at the current divergence breakpoint or the first target point; a distance adjustment action: the user continuously gazes at the target corresponding to the user's left and right eyes located at the current divergence breakpoint or the first target point, and repeatedly adjusts the distance between the user's eyes and the target corresponding to the user's left and right eyes; and a target changing action: multiple second target points are set within the preset radius of the current divergence breakpoint. The user should continuously focus on one of the multiple second target points. Specifically, the user should keep their eyes fixed on the target as it moves left and right.

[0031] The step length of the left and right eye target movement affects the size of the rupture point and the accuracy of the measurement, an issue that will be addressed in another patent. If the sole purpose is to relax the eyes, simply repeating steps S3 or S3 and S4 indefinitely without addressing step S5, or merely repeating one or more of the preset relaxation actions, this also constitutes an infringement of this patent.

[0032] Specifically, in step S4, the left-eye target is moved further to the left from the position corresponding to the current divergence breakpoint, and the right-eye target is moved further to the right from the position corresponding to the current divergence breakpoint. This increases the target spacing and causes the visual axes of both eyes to diverge until a single visual image separates or breaks again, resulting in a new breakpoint. The current divergence breakpoint is then updated using this new divergence breakpoint. The distance and speed of the further left and right movements can be the same or different. In this application, the current divergence breakpoint refers to the most recently acquired divergence breakpoint. After acquiring the value of a new divergence breakpoint, the value of the current divergence breakpoint is updated using the new value.

[0033] Regarding step S5, specifically, the operation is stopped, and the current divergence breakpoint that cannot be fused obtained from the last update is determined as the ultimate divergence breakpoint. Specifically, the last value or the maximum value among all the collected divergence breakpoints can be used as the value of the ultimate divergence breakpoint.

[0034] In a specific example, the steps include: Step 1: Prepare an image for observation, such as... Figure 6 As shown, specifically, the image described in the observation image is a piece of paper or a lightbox with "a vertical line" or "a vertical line and a panda" drawn on it; a prism is placed in front of each eye of the user being tested, and the bases of the two prisms are placed symmetrically with their bases facing inwards, as shown. Figure 7 As shown, at this time, the two left and right prisms will cause one image to become two images through refraction. The two images are the same as the original image. Figure 1 Two identical virtual images are shown, each containing a vertical line. The left eye can only see the left virtual image, and the right eye can only see the right virtual image. As the horizontal component of the prism changes, the lateral distance between the two virtual images will change even when the eyes remain stationary. Step 2: Have the inspector stand 5 meters away from the image. First, make the horizontal prism component approach zero. At this time, the two virtual images are almost overlapping, so the eyes can easily merge into one. Step 3: Slowly adjust the prism, gradually increasing the horizontal component from zero. This is equivalent to the left virtual image moving to the left and the right virtual image moving to the right, increasing the distance between the two virtual images. With your left eye continuing to look at the left virtual image and your right eye continuing to look at the right virtual image, your gaze will gradually diverge as the distance between the two virtual images increases. Figure 7 As shown. When the eyes can no longer open, the eyes will separate or rupture, as... Figure 8 As shown, this point is the divergence rupture point.

[0035] Step 4: After the break occurs as described in Step 3, stop adjusting the prism, that is, stop changing the distance between the two virtual images. At this time, it is equivalent to the two virtual images being located at the break point. Have the left eye continue to look at the left virtual image and the right eye continue to look at the right virtual image. The distance between the two broken virtual images can be agreed upon by two vertical lines. Maintain this distance for a certain preset time, such as 10 minutes. Driven by the instinct to merge images, the eyes will merge into one, and the broken state will become a fused state.

[0036] When initially detecting the break point, the prism can be adjusted after a break occurs. A target point can be set within a preset radius, increasing the distance between the two virtual images by a certain margin, such as 4▽ greater than the break point, thus widening the break. At this point, the two virtual images are essentially located behind the break point, and this point is the first target point within the preset radius (±7▽) of the current diverging break point. Maintaining this position for a certain period allows fusion to occur under the influence of the merging instinct and the relaxation of the ciliary muscles. When approaching the final break point, it is best to refine the amount of breakage, i.e., the step size.

[0037] Of course, each time a break point is encountered, the prism can be adjusted in the opposite direction to reduce the break by 2▽, so that the break disappears. At this time, the two virtual images are equivalent to being in a fused state in front of the break point. This is also the first target point within the preset radius range (±7▽) of the current diverging break point. This will also relax the ciliary muscle, allowing the break point to move backward or increase, which increases comfort but reduces efficiency.

[0038] Step 5: Repeat steps 3 and 4 repeatedly. The divergence breakpoints will be continuously broken and increased. When it is found that the divergence breakpoints are no longer broken or increased, this value is considered the ultimate breakpoint and is recorded. This process is the process of relaxing the ciliary muscle and eliminating ciliary muscle tension or spasm. The detected divergence breakpoints, especially the ultimate breakpoints, can also be used as feature values ​​for prism parameter design.

[0039] In another specific embodiment, a series of glasses with different prism powers can be used to relax ciliary muscle tension, relieve eye strain, or detect the ultimate break point. Prepare a series of prism glasses, placed bottom-in, with each eye starting with one prism (BI 1▽), named Type A; followed by prism BI 2▽, Type B; then BI 3▽, Type C; BI 4▽, Type D; BI 5▽, Type E; BI 6▽, Type F… and so on. Depending on the needs, the prism power can be increased to a maximum of 10▽J or 20▽T, etc. That is, each additional model increases the monocular prism power by one prism, equivalent to a step size of one prism. The models are arranged alphabetically, starting with A. The specific operating steps are as follows: Have the user wear the series of prism glasses, starting with Type A, and look at a target 5 meters away, such as one containing a vertical line. Figure 6If no crack appears, replace with the next model, B, C, ..., until a crack appears. Figure 8 Continue looking at the target while wearing the glasses that have already broken, for a period of time, with a maximum preset duration of 20 minutes, until the eyes fuse. Then change to the next model of glasses. If there is no breakage, continue changing to the next model of glasses until a breakage occurs. Repeat the above steps until it is believed that the breakage cannot be fused within the preset duration of 10 minutes. This final breakage point is the ultimate breakage point. In fact, this process is the process of eliminating ciliary muscle tension.

[0040] During the testing process, if a break occurs, the distance between the eye and the target can be repeatedly changed to expedite the process and quickly fuse the images into a single view. Alternatively, this series of prism glasses could be combined into a single instrument that allows for convenient and continuous adjustment of the horizontal prism component, while the vertical prism component is canceled out by the synchronous rotation of two prisms. This would be more precise and convenient.

[0041] A second aspect of this application provides a method for fitting lenses, which uses any current divergence break point or ultimate divergence break point measured above as a characteristic value to determine the prism parameters of a near-field or far-field prism composite lens; and customizes a prism composite lens made of one or more of prisms, spherical lenses and cylindrical lenses according to a preset parameter matching rule.

[0042] In one possible implementation, the prism parameters for near-field or far-field prism composite lenses are determined using the following formula: X=B L –B0 D ±ΔY±ΔZ; Where X is the prism parameter, and the unit is prism diopters; B L The current divergence breakpoint or ultimate divergence breakpoint detected by the user at a viewing distance L, in prism diopters; B0 D The current divergence breakpoint or ultimate divergence breakpoint for a specified population at a specified viewing distance D, or a fixed value selected within the range of 0 to 7▽; ΔY is the correction value between the detection range L and the specified range D; ΔZ is the comprehensive correction value for the prism parameters other than the divergence break point.

[0043] In one possible implementation, the prism parameters of the near-field prism compound are determined using the following formula: X=B L –B0 D +A±ΔY±ΔZ; Where A is the angle between the first viewing distance and the specified viewing distance D, that is, the angle of rotation of the user's eyes between the two viewing distances, and the unit is prism diopters ▽.

[0044] In one possible implementation, the prism parameters for the near-field prism compound lens are determined using a formula design: X=B NL+M ±ΔZ; Where NL is the user's second viewing distance; M is the distance increment that satisfies NL+M > NL; B NL+M This refers to the user's current or ultimate divergence breakpoint at a viewing distance of NL+M, expressed in prism diopters (▽).

[0045] In one specific embodiment, the divergence breakpoint is used in designing the parameters of a prism-based composite lens for myopia control. A 9-year-old user has a pupillary distance of 60mm, myopia of -3.00D (diopter) in both eyes, and no astigmatism. The specific steps for fitting distance and near vision prism-based composite lenses include: Step 1: Record the detected divergence breakpoint. This can be any current divergence breakpoint, but the final divergence breakpoint is preferred because it is more stable, leading to a more stable and lasting effect. In this embodiment, the final divergence breakpoint is used as the feature value to design the prism power, obtain the prism parameters required to correct eye position, and then use them to fit prism-transparent composite lenses.

[0046] Step 2: Detect the divergent breaking point of a designated population, namely a certain number of college students who are not prone to myopia, and obtain the average value of the ultimate breaking point at 5 meters for this group. Use B0 as the criterion. D To represent this, we'll directly use a fixed value, set at 5▽ for a single eye; Step 3: First, correct the user's vision, then detect the user's ultimate divergence breakpoint at 5 meters, denoted by BL. Here, the user's BL test result is 12▽ for one eye. Step 4: Design the prism parameters X for the user's telescopic prism composite lens, using the following formula: X=B L –B0 D ±ΔY±ΔZ Where: ΔY is the correction value between the detection distance L and the specified distance D, which is zero here since the detection is performed at 5 meters; ΔZ is the comprehensive correction value for all factors affecting the prism parameters other than the divergence break point, which is set to zero here.

[0047] Then X = 12 - 5 ± 0 ± 0 = 7 The distance vision prism composite lens is custom-made based on the user's myopia and astigmatism, combined with the prism parameters of BI7▽. If, after a period of time, the divergence breakpoint is found to have significantly increased, the prism composite lens will need to be re-ordered, and the ultimate breakpoint will be updated. Under normal circumstances, the ultimate breakpoint will not significantly increase, and wearing BI prism glasses will not cause the ultimate breakpoint to continuously increase; this is a conclusion that has been tested and verified. Step 5: Design the prism parameter X for the near-field prism compound lens used by this user at 33cm. The formula is: X=B L –B0 D ±ΔY±ΔZ Where: A is the angle between the first distance of visual perception and the specified distance. Combining the user's interpupillary distance of 60mm and visual distance of 33cm, the angle is calculated to be 4.85 degrees, which is converted to a prism power of 8.2▽. Here, the first distance refers to the near distance of visual perception of 33cm. The correction value for ΔY is zero; ΔZ is the correction value for the prism parameters caused by the contradiction between the viewing target being close and the eyes being in a telescopic state. Here, it is taken as -3 prisms.

[0048] Therefore: X = 12 – 5 + 8.2 ± 0 – 3 = 12.2 The near vision prism composite lens is made by adding +2.00D to the user's myopia power as the spherical power, while keeping the astigmatism power unchanged, and is customized with a composite prism of BI12.2▽. Step 6: If the user's right eye myopia is -3.00D and the left eye myopia is -2.00D, meaning the right eye myopia is 100 degrees higher than the left eye myopia, then the right eye prism power must be greater than the left eye prism power. Here, for distance vision, the prism power is set to 8▽ for the right eye and 6▽ for the left eye. The amount of reduction in the left eye is the amount of increase in the right eye. At the same time, for near vision, the prism power is set to 13.4▽ for the right eye and 11▽ for the left eye, keeping the total prism power of both eyes unchanged.

[0049] In one possible implementation, the preset parameter matching rule is as follows: the myopia spherical power of the near-vision prism composite lens is 1.00–2.50D lower than that of the distance-vision prism composite lens, and the prism power of the near-vision prism composite lens is 3–9 prism powers higher than that of the distance-vision prism composite lens. In another possible implementation, when the myopia degrees of the user's two eyes are inconsistent, more prism power is allocated to the eye with higher myopia, and less prism power is allocated to the eye with lower myopia. In yet another possible implementation, the prism composite lens is two independent pairs of glasses adapted for near and distance vision scenarios respectively, or a pair of glasses with a double-layered lens structure (front and back), or a pair of glasses with the lower half of the lens used for near vision and the upper half for distance vision.

[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0051] The various embodiments in this specification are described in a related manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments. For related parts, please refer to the description of the method embodiment.

[0052] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A method for detecting divergent fracture points, characterized in that, Includes the following steps: S1. Set corresponding targets for the user's left and right eyes at the initial position, wherein the targets corresponding to the user's left and right eyes are isolated and can move independently to the left and right. At the initial position, the targets corresponding to the user's left and right eyes are in a fusion state. In the fusion state, the targets corresponding to the user's left and right eyes in the user's field of vision will be fused into a single image. S2. Move the target corresponding to the left eye to the left and the target corresponding to the right eye to the right, and cause the visual axes of the user's eyes to diverge until the targets corresponding to the user's left and right eyes are separated or broken from the fused state and become broken; when the broken state occurs, mark the position of the target corresponding to the user's left and right eyes as the current divergence break point; S3. After performing one or more preset relaxation actions and maintaining them for a preset duration, if the target corresponding to the user's left and right eyes in the user's field of vision changes from a broken state to a fused state at the current divergence break point, proceed with S4 sequentially; if the target corresponding to the user's left and right eyes is still in a broken state at the current divergence break point, proceed with S5. S4. Continue to move the target corresponding to the left eye to the left and the target corresponding to the right eye to the right, further increasing the distance between the two targets and causing the user's visual axes to diverge until the targets corresponding to the user's left and right eyes in the user's field of vision are separated or broken again from the fused state and become a broken state; update the current divergence break point with the position of the target corresponding to the user's left and right eyes when the broken state occurs again, and return to execute S3; S5. Stop the operation and determine the current divergence break point obtained from the last detection as the final divergence break point.

2. The method for detecting divergent fracture points according to claim 1, characterized in that, The preset relaxation actions include: Reciprocating movement: The user continuously gazes at the target corresponding to the left and right eyes, which reciprocates between the initial position and the current divergence break point or the first target point, wherein the first target point is a point set within a preset radius of the current divergence break point; Fixed gaze action: The user continuously gazes at the target corresponding to the user's left and right eyes at the current divergence breakpoint or the first target point; Visual distance adjustment action: The user continuously gazes at the target corresponding to the user's left and right eyes located at the current divergence break point or the first target point, and repeatedly adjusts the distance between the user's eyes and the target corresponding to the user's left and right eyes; Target-changing action: Set multiple second target points within a preset radius of the current divergence break point, and make the user continuously focus on different target points among the multiple second target points.

3. A method for fitting eyeglasses, characterized in that, Using any current divergence break point or ultimate divergence break point measured in claim 1 or 2 as a characteristic value, determine the prism parameters of the near-field or far-field prism composite lens; customize the prism composite lens according to the preset parameter matching rules, which is made of one or more of prisms, spherical lenses and cylindrical lenses.

4. The method for fitting eyeglasses according to claim 3, characterized in that, The prism parameters for near-field or far-field prism composite lenses are determined using the formula: X=B L –B0 D ±ΔY±ΔZ; Where X is the prism parameter, and the unit is prism diopters; B L The current divergence breakpoint or ultimate divergence breakpoint detected by the user at a viewing distance L, in prism diopters; B0 D The current divergence breakpoint or ultimate divergence breakpoint for a specified population at a specified viewing distance D, or a fixed value selected within the range of 0 to 7▽; ΔY is the correction value between the detection range L and the specified range D; ΔZ is the comprehensive correction value for the prism parameters outside the divergence break point.

5. The method for fitting eyeglasses according to claim 4, characterized in that, The prism parameters for near-field prism-transmission lenses are determined using the following formula: X=B L –B0 D +A±ΔY±ΔZ; Where A is the angle between the first viewing distance and the specified viewing distance D, that is, the angle of rotation of the user's eyes between the two viewing distances, and the unit is prism diopters ▽.

6. The method for fitting eyeglasses according to claim 4, characterized in that, The prism parameters for near-field prism-transmission composite lenses are determined using a formula design: X=B NL+M ±ΔZ; Where NL is the user's second viewing distance; M is the distance increment that satisfies NL+M > NL; B NL+M This refers to the user's current or ultimate divergence breakpoint at a viewing distance of NL+M, expressed in prism diopters (▽).

7. The method for fitting eyeglasses according to claim 4, characterized in that, The preset parameter matching rule is as follows: the myopia spherical power of the near-field prism composite lens is 1.00 to 2.50D lower than that of the distance-field prism composite lens, and the prism power of the near-field prism composite lens is 3 to 9 prism powers higher than that of the distance-field prism composite lens.

8. The method for fitting eyeglasses according to claim 4, characterized in that, When the myopia degree of the user's two eyes is inconsistent, more prisms are allocated to the eye with higher myopia degree and less prisms are allocated to the eye with lower myopia degree.

9. The method for fitting eyeglasses according to claim 4, characterized in that, The prism-transparent composite lens is either two independent pairs of glasses adapted to near-distance and far-distance vision scenarios, or a pair of glasses with a double-layered lens structure, or a pair of glasses with the lower half of the lens used for near vision and the upper half used for far vision.

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