Contact lens combination and its fitting method

Abstract

The present disclosure relates to a contact lens combination, which includes a first contact lens group and a second contact lens group. The first central optical zone of the first contact lens group is used to correct distance vision, and the first peripheral refractive power covers an additional refractive power range of +2D to +6.5D relative to the first prescription refractive power. The second central optical zone of the second contact lens group is used to correct near vision, and the second peripheral refractive power covers an additional refractive power range of -4.5D to -2.4D relative to the second prescription refractive power. The first transition refractive power distribution and the second transition refractive power distribution have opposite changing trends. The contact lens combination can improve the distance, near, and intermediate distance vision of patients with presbyopia.

Description

Technical Field

[0001] The present disclosure relates to the field of ophthalmic lenses, and in particular to a contact lens that is intended to be worn in front of a person's eyes to correct refractive errors such as presbyopia and myopia. Background Art

[0002] Refractive errors can result from improper eye use, genetics, and normal physiological development. Refractive errors manifest as blurred vision, and they affect an increasing proportion of the population. Refractive errors can be categorized as myopia, hyperopia (farsightedness), astigmatism, and presbyopia. Each of these refractive errors can be corrected with either eyeglasses or contact lenses.

[0003] Presbyopia, also known as old eyesight, is a physiological phenomenon. It's neither a pathological condition nor a refractive error. It's a visual problem that inevitably develops in middle-aged and elderly people. Presbyopia is one of the hallmarks of aging. With age, the lens of the eye gradually hardens and thickens, and the eye muscles' ability to adjust decreases, leading to a decrease in zoom capability. Consequently, when looking at close objects, the image cannot fully focus on the retina, resulting in blurry images.

[0004] There are traditional single-vision (single-focus) glasses on the market, as well as bifocal (bifocal) and progressive multifocal glasses that have appeared in recent years, which are used to correct presbyopia. Among them, bifocals and progressive multifocal lenses are mostly frame glasses. The principle of correcting presbyopia with this type of lens is to use the refractive effect of the optical zone of the contact lens to compensate for the patient's insufficient accommodative power of the lens. Bifocals are glasses that have a far vision optical zone for correcting far vision and a near vision optical zone for correcting near vision in the same lens. When patients use these bifocals, they are prone to blurred vision when adjusting their vision from far to near. This is because bifocals lack an area with refractive power between the refractive power required to correct far vision and the refractive power required to correct near vision. When the patient's eyes move from the far vision optical zone to the near vision optical zone, their vision will pass through the middle distance zone, and the lens cannot provide the corresponding vision compensation function at this time.

[0005] Among these lenses, progressive multifocals utilize distinct zones within the same lens for near, intermediate, and far vision. These lenses effectively address the blurred intermediate vision caused by bifocals and are currently the most ideal method for correcting presbyopia. They ensure clear near vision while also ensuring good intermediate and far vision. However, the distance between the lens and the corneal apex of the framed glasses results in a certain magnification, which can cause discomfort and dizziness for the wearer.

[0006] Therefore, there is an urgent need for a lens that can provide clear vision for patients with refractive errors while inhibiting further progression of vision.

[0007] Public content

[0008] In view of the above-mentioned status quo of various types of glasses according to the prior art, one of the purposes of the present disclosure is to provide a contact lens combination and a method for fitting the same that ensures that presbyopic patients can obtain good visual effects in near, intermediate and far vision, and is less affected by pupil size in different light fields.

[0009] The object is achieved by disclosing the following contact lens combination and a method for fitting the same. The contact lens combination comprises:

[0010] a first contact lens set comprising a series of first contact lenses adapted to a patient's dominant eye, the first contact lenses comprising a first central optical zone located in a central area, a first peripheral optical zone located in a peripheral area thereof, and a first transition zone between the first central optical zone and the first peripheral optical zone, wherein the first central optical zone has a first prescription refractive power based on the patient's distance vision prescription, the first transition zone has a first transition refractive power distribution covering the distance vision prescription and the near vision prescription of the dominant eye, and the first transition refractive power distribution has a first peripheral refractive power at an outer edge of the first transition zone, the first contact lenses in the series have different first transition refractive power distributions, and the first peripheral refractive powers of the first contact lenses in the series cover an additional refractive power range of +2D to +6.5D relative to the first prescription refractive power, and the first transition refractive power distribution smoothly transitions from the first prescription refractive power to the first peripheral refractive power; and

[0011] a second contact lens set comprising a series of second contact lenses adapted for a non-dominant eye of a patient, the second contact lenses comprising a second central optical zone located in a central area, a second peripheral optical zone located in a peripheral area thereof, and a second transition zone between the second central optical zone and the second peripheral optical zone, wherein the second central optical zone has a second prescription refractive power based on a near vision prescription of the patient, the second transition zone has a second transition refractive power distribution covering a near vision prescription and a distance vision prescription of the non-dominant eye, the second transition refractive power distribution has a second peripheral refractive power at an outer edge of the second transition zone, the second contact lenses in the series have different second transition refractive power distributions, and the second peripheral refractive powers of the second contact lenses in the series cover an additional refractive power range of -4.5D to -2.4D relative to the second prescription refractive power, and the second transition refractive power distribution smoothly transitions from the second prescription refractive power to the second peripheral refractive power,

[0012] The first transition refractive power distribution and the second transition refractive power distribution have opposite changing trends.

[0013] Preferably, each of the first contact lenses has a first transition zone additional refractive power at a radius of 2.5 mm that is different from the first prescription refractive power, and the first transition zone additional refractive power of the series of the first contact lenses covers an additional refractive power range of +1.5D to +4.5D relative to the first prescription refractive power.

[0014] Preferably, each of the second contact lenses has a different second transition zone additional refractive power at a radius of 2.5 mm compared to the second prescription refractive power, and the second transition zone additional refractive power of the series of second contact lenses covers an additional refractive power range of -3D to -1.5D relative to the second prescription refractive power.

[0015] Preferably, among the second contact lenses in the series, the second contact lens having the largest span of the second transition refractive power distribution has the smallest absolute value of the second prescription refractive power.

[0016] Preferably, the radius of the first central optical zone is any value within the range of 0.9 mm to 1.25 mm.

[0017] Preferably, the radius of the second central optical zone is any value within the range of 0.75 mm to 1.25 mm, and the radius of the first central optical zone is not less than the radius of the second central optical zone.

[0018] Preferably, among the second contact lenses in the series, the second contact lens with the largest second transition refractive power distribution has the largest second central optical zone radius.

[0019] Preferably, the outer diameter of the first transition zone is selected from any value within the range of 6.4 mm to 7.6 mm; and / or

[0020] The outer diameter of the second transition zone is selected from any value within the range of 6.4 mm to 7.6 mm, and the radii of the central optical zones of at least a portion of the second contact lenses in the series are different from each other.

[0021] Preferably, the first contact lens group comprises at least three groups of first contact lenses, and the add refractive powers of the first peripheral optical zones of different groups of first contact lenses gradually increase; and / or

[0022] The second contact lens group comprises at least three groups of second contact lenses, and the add refractive powers of the second peripheral optical zones of different groups of second contact lenses gradually increase.

[0023] In addition, the present disclosure also relates to a method for fitting a lens applicable to any of the above contact lens combinations, wherein the method comprises:

[0024] an optometry step, using a detection device to determine the refractive parameters of the patient's eyes, the dominant eye, and the non-dominant eye, wherein the refractive parameters include hyperopia and presbyopia;

[0025] The step of selecting a trial lens set is to select the first trial lens set according to the following table;

[0026]

[0027] A trial lens set optometry step, wherein after a predetermined period of time after the patient has worn the first trial lens set, the patient's binocular distance and near vision in both bright and dark fields are verified. If the verification results meet the visual requirements, the parameters of the first trial lens set are selected as the parameters of the lens set required by the patient. If the verification results do not meet the visual requirements, the process proceeds to the next step;

[0028] The initial adjustment step of the trial lens set. When the patient's distance vision is found to be insufficient in the trial lens set optometry step, the prescription refractive power of the first contact lens in the optional trial lens set step is adjusted according to the step size of ±0.25D. When the patient's near vision is found to be insufficient in the trial lens set optometry step, the prescription refractive power of the second contact lens in the optional trial lens set step is adjusted according to the step size of ±0.25D, and the trial lens set optometry step is re-entered.

[0029] Preferably, the glasses fitting method further includes a trial lens set polyadjustment step. When the number of sequential iterations of the trial lens set refraction step and the trial lens set initial adjustment step reaches 2, the trial lens set polyadjustment step is entered. In the trial lens set polyadjustment step, the first contact lens and the second contact lens are replaced in a manner of increasing or decreasing the level in the last trial lens set initial adjustment step according to the appendix of the trial lens set selection step, and the trial lens set refraction step is re-entered.

[0030] Preferably, the predetermined time is 10-15 minutes.

[0031] On the basis of conforming to the common sense in this field, the above-mentioned preferred implementation modes can be arbitrarily combined to obtain the preferred embodiments of the present disclosure.

[0032] The contact lens set designed in this disclosure features different central optical zones and transition zones for the dominant and non-dominant eyes. The unique refractive power distributions of the first and second transition zones of the first and second contact lens sets, combined with the distance vision correction of the first central optical zone and the near vision correction of the second central optical zone, ensure excellent near, intermediate, and far distance vision for presbyopic patients, while minimizing the impact of pupil size in varying light and dark conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] To better understand the above and other objects, features, advantages, and functions of the present disclosure, reference may be made to the preferred embodiments shown in the accompanying drawings. Like reference numerals in the accompanying drawings refer to like components. Those skilled in the art should understand that the accompanying drawings are intended to schematically illustrate preferred embodiments of the present disclosure and have no limiting effect on the scope of the present disclosure. The components in the drawings are not drawn to scale.

[0034] Figure 1 is a schematic structural diagram of the front side of a spectacle lens according to a preferred embodiment of the present disclosure;

[0035] Figure 2 is a refractive power distribution diagram of each first contact lens of the first contact lens set according to a preferred embodiment of the present disclosure;

[0036] Figure 3 is a refractive power distribution diagram of each second contact lens of the second contact lens set according to a preferred embodiment of the present disclosure;

[0037] Figure 4 This chart shows the visual effects of a patient wearing different contact lens combinations. DETAILED DESCRIPTION

[0038] Next, the disclosed concept of the present disclosure will be described in detail with reference to the accompanying drawings. What is described here is only a preferred embodiment according to the present disclosure. Those skilled in the art can think of other ways to implement the present disclosure on the basis of the preferred embodiment, and the other ways also fall within the scope of the present disclosure. In the following specific description, directional terms such as "upper", "lower", "inner", "outer", "longitudinal", "horizontal" and the like are used with reference to the directions described in the accompanying drawings. The components of the embodiments of the present disclosure can be placed in a variety of different directions, and the directional terms are for illustrative purposes only and are not restrictive.

[0039] In the present disclosure, the term "contact lens" refers generally to an ophthalmic lens suitable for fitting on the front surface of the human eye. It should be understood that the contact lens provides clinically acceptable supraorbital movement without being embedded in the eyeball and causing damage to the eyeball. Contact lenses are also called contact lenses, which can be corneal contact lenses, scleral contact lenses, corneoscleral contact lenses, etc. Corneal contact lenses usually land on the human cornea or corneal limbus; scleral contact lenses usually land on the sclera; corneoscleral contact lenses usually land on the corneal limbus or on the corneal limbus and sclera. The contact lens can be a soft contact lens, such as a hydrogel contact lens or a silicone hydrogel contact lens; it can be a hard contact lens, such as a lens made of hard materials such as polymethyl methacrylate (PMMA) and silicone methacrylate (SiMA); it can also be a lens made of soft materials and hard materials together.

[0040] Figure 1A front view of each first contact lens of the first contact lens set or each second contact lens of the second contact lens set according to the present disclosure is shown. This view shows the first contact lens (or second contact lens) from a perspective directly in front of the center of the contact lens. The front surface of the contact lens is the surface facing away from the human eye (referred to as the "external surface" or "front surface"); the back surface of the contact lens is the surface that contacts the human eye (referred to as the "inner surface" or "back surface").

[0041] According to the present disclosure, the contact lens includes a central optical zone, a transition zone, and a peripheral optical zone, which are sequentially distributed from the inside to the outside. The first contact lenses A1, A2, and A3 of the first contact lens group A include, from the inside to the outside, a first central optical zone 11, a first transition zone 12, and a first peripheral optical zone 13; the second contact lenses B1, B2, and B3 of the second contact lens group B include, from the inside to the outside, a second central optical zone 21, a second transition zone 22, and a second peripheral optical zone 23. Figure 2 、 3 In the example, the boundaries of the respective partitions of the first contact lenses A1, A2, A3 and the second contact lenses B1, B2, B3 are inflection points in the refractive power distribution curves of the corresponding contact lenses.

[0042] The first contact lens set A of the present disclosure includes a series of first contact lenses A1, A2, and A3 adapted for a patient's dominant eye. The "dominant eye" referred to in this disclosure is also called the primary or dominant eye. The dominant eye refers to the eye that plays a dominant role in receiving visual information. Numerous methods exist in the prior art for detecting a patient's dominant eye, so determining eye dominance will not be discussed further here.

[0043] The "far vision" involved in this disclosure refers to the vision of the eyes when observing distant objects; correspondingly, the "far vision prescription" refers to the corrective refractive power required for the eyes to obtain ideal visual sensitivity when observing distant objects.

[0044] The "near vision" involved in this disclosure refers to the vision of the eyes when observing close objects; correspondingly, the "near vision prescription" refers to the corrective refractive power required for the eyes to obtain ideal visual sensitivity when observing close objects.

[0045] The relevant expressions of "radius" in this disclosure are based on the optical center of the contact lens. For example, "radius 0.5 mm" means the position 0.5 mm away from the optical center of the corresponding contact lens.

[0046] Generally speaking, the number of the first contact lens group A is not less than three. The first central optical zone 11 of each first contact lens A1, A2, A3 has a first prescription refractive power based on the patient's distance vision prescription.

[0047] The radius of the first central optical zone 11 of each first contact lens A1, A2, A3 is selected from any value within the range of 0.9mm-1.25mm (corresponding to a diameter of 1.8mm-2.5mm) so that the wearer can adapt to the needs of observing distant objects. Generally speaking, the first central optical zone 11 is selected to have a larger value within the above range to ensure better distance vision; but this also means that the area that can provide near vision correction on the first contact lens A1, A2, A3 is reduced, and the myopia correction effect will be weakened. For this reason, according to the series of lenses designed by the applicant and based on the patient's wearing effect, in a more preferred embodiment, the radius of the first central optical zone 11 is set within 1mm-1.2mm. For example, Figure 2 In the example shown, the radius of the first central optical zone 11 is set to 1.15 mm. This example first central optical zone 11 is particularly suitable for people of East Asian descent. It is understood that the radius of the first central optical zone 11 can also be set to 1 mm, 1.1 mm, 1.2 mm, etc., depending on pupil size and individual perception.

[0048] The first transition zone 12 has a first transition refractive power distribution that covers both the distance and near vision prescriptions for the dominant eye. To achieve a certain degree of near vision while ensuring good distance vision for the dominant eye, and to avoid the dizziness caused by contact lenses during the transition between distance and near vision, the first contact lenses A1, A2, and A3 of the present disclosure are each designed with a relatively wide width. While the first central optical zone 11 is within the aforementioned radius range, the outer diameter of the first transition zone 12 is set to any value within the range of 6.4 mm to 7.6 mm, for example. Figure 2 7mm is shown, and 6.8mm, 7.2mm, etc. are not shown.

[0049] The first transition refractive power distribution has a first peripheral refractive power at the outer edge of the first transition zone 12. The first transition refractive power distribution smoothly transitions from the first prescription refractive power to the first peripheral refractive power. In the present disclosure, the first transition refractive powers of the first contact lenses A1, A2, and A3 in the series are all different, and the first peripheral refractive powers of the first contact lenses A1, A2, and A3 in the series cover a wide range. Specifically, the first peripheral refractive powers of the first contact lenses A1, A2, and A3 in the series cover an additional refractive power range of +2D to +6.5D relative to the first prescription refractive power. Thus, the first transition zone 12 covers both distance and near vision prescriptions for presbyopic patients, and the coverage range also exceeds both distance and near vision prescriptions. Due to the smooth refractive power distribution of the first central optical zone 11 and the first transition zone 12 of the first contact lenses A1, A2, and A3, the wearer's dominant eye does not experience a noticeable difference in vision during the transition between distance and near vision.

[0050] exist Figure 2In the example shown, the first peripheral refractive powers of the series of first contact lenses A1, A2, and A3 only cover an additional refractive power range of +2.6D to +6.1D relative to the first prescription refractive power. However, in other examples not shown, the range of the first peripheral refractive powers of the series of first contact lenses A1, A2, and A3 can be appropriately expanded. This can be achieved by increasing the number of first contact lenses in the series and / or increasing the difference in first peripheral refractive power between each level of first contact lenses.

[0051] exist Figure 2 In the example, the first peripheral optical zone 13 of each first contact lens A1, A2, A3 has a single refractive power, which is the first peripheral refractive power. In addition, the first peripheral optical zone 13 can also be configured to have multiple refractive powers or to have a continuously changing refractive power distribution.

[0052] The first peripheral optical zone 13 includes a landing zone, which ensures the secure fit of the contact lens and the quality of tear exchange between the inner and outer regions of the lens, as well as an edge lift, which ensures the quality of tear exchange between the inner and outer regions of the contact lens and the wearing comfort. Depending on the specific type of contact lens, the landing zone corresponds to different areas of the user's eye. For example, for a scleral contact lens, the landing zone corresponds to the sclera of the eye. The landing zone and edge lift are not the focus of this article and will not be discussed in detail here.

[0053] The second central optical zone 21 of each second contact lens B1, B2, B3 of the second contact lens group B has a second prescription refractive power based on the patient's near vision prescription. The radius of the second optical zone of each second contact lens B1, B2, B3 is taken from any value within the range of 0.75mm-1.25mm (corresponding to a diameter of 1.5mm-2.5mm). Compared with the first central optical zone 11 of the series of first contact lenses A1, A2, A3 adapted for the wearer's dominant eye, the radius of the second central optical zone 21 adapted for the wearer's non-dominant eye is designed to be the same size as it, or to be designed to have a smaller value. Combined Figure 2 、 3 It can be seen that in this example, the radius of the first central optical zone 11 of the first contact lenses A1, A2, and A3 is 1.15 mm, while in the series of second contact lenses B1, B2, and B3, the radius of the second central optical zone 21 of the second contact lenses B1 and B2 is 0.85 mm, and only the radius of the second central optical zone 21 of the second contact lens B3 is set to 1.15 mm.

[0054] The second transition zone 22 of the second contact lens B1, B2, B3 has a second transition refractive power distribution that covers the near vision prescription and the distance vision prescription of the non-dominant eye. The second transition refractive power distribution has a second peripheral refractive power at the outer edge of the second transition zone 22. The second contact lenses B1, B2, B3 of the series have different second transition refractive power distributions, and the second peripheral refractive power of the second contact lenses B1, B2, B3 of the series covers an additional refractive power range of -4.5D to -2.4D relative to the second prescription refractive power. Each second transition refractive power distribution can span the range from near vision prescription to distance vision prescription. The second transition refractive power distribution smoothly transitions from the second prescription refractive power to the second peripheral refractive power.

[0055] Based on the similar design mechanism of the first peripheral optical zone 13 of the above-mentioned first contact lenses A1, A2, and A3, a landing area for ensuring the firmness of the contact lens wearing and the quality of tear exchange in the inner and outer areas of the contact lens, as well as edge warping for ensuring the quality of tear exchange in the inner and outer areas of the contact lens and wearing comfort can be provided on the second peripheral optical zone 23 of the second contact lenses B1, B2, and B3.

[0056] Combine Figure 2 、 3 It can be seen that the first transitional refractive power distributions of the first contact lens set A, which matches the dominant eye, generally show an increasing trend, while the second transitional refractive power distributions of the second contact lens set B, which matches the non-dominant eye, generally show a decreasing trend. The first transitional refractive power distributions and the second transitional refractive power distributions change in opposite directions.

[0057] Combine Figure 2 、 3 As can be seen, in the contact lens combination disclosed herein, the first central optical zone 11 of the first contact lens set A ensures distance vision, while the second central optical zone 21 of the second contact lens set B ensures near vision. The design of the first and second transitional refractive power distributions, with oppositely varying trends, and each transitional refractive power distribution spanning near and distance vision prescriptions, ensures that the wearer achieves high visual acuity at all distances when using this contact lens combination. This design can, in fact, have a certain preventive effect on the further development of presbyopia.

[0058] It should be noted that Figure 2 、 3 The refractive power distribution diagrams of the first contact lens set A and the second contact lens set B shown are for patients with 3.0D presbyopia and low, moderate, and high myopia, respectively. The refractive power distribution diagrams of contact lens sets suitable for other presbyopia and myopia (or only presbyopia or myopia) can be found in Figure 2 、 3The illustrated refractive power distribution diagrams are obtained based on mathematical summation, and therefore, other examples are not shown one by one.

[0059] It should be noted that the refractive power distribution of the first contact lens group A and the second contact lens group B is suitable for patients with astigmatism and other circumferentially asymmetric refractive problems. In this case, the refractive power distribution in each meridian direction can be adjusted according to Figure 2 、 3 The refractive power distribution shown is mathematically summed. To accommodate patients with astigmatism and other conditions, contact lens technologies can be used in the peripheral optical zone to minimize lens rotation. Examples include prism ballast, double slab-off, and truncation. These technologies essentially involve specialized designs in the peripheral optical zone of the contact lens. These designs are conventional and therefore will not be discussed in detail.

[0060] Preferably, the first central optical zone 11 of each first contact lens A1, A2, A3 is provided with a single refractive power corresponding to the first prescribed refractive power in its meridian direction, without any additional refractive power or fluctuating refractive power distribution, in order to maintain better distance vision acuity. In particular, the entire area of ​​the first central optical zone 11 of the first contact lens A1, A2, A3 is provided with a single refractive power.

[0061] In the second contact lens set B, the second central optical zone 21 of the second contact lenses B1, B2, and B3 is provided with a single refractive power corresponding to the second prescribed refractive power in the meridian direction without any additional refractive power or fluctuating refractive power distribution, in order to maintain better near vision acuity. In particular, the entire area of ​​the second central optical zone 21 of the second contact lenses B1, B2, and B3 is provided with a single refractive power.

[0062] Preferably, each of the first contact lenses A1, A2, A3 has a first transition zone additional refractive power different from the first prescription refractive power at a radius of 2.5 mm, and the first transition zone additional refractive power of the series of first contact lenses A1, A2, A3 is set to cover an additional refractive power range of +1.5D to +4.5D. Figure 2 In the illustrated first contact lens set A consisting of three first contact lens sets A, the first contact lens numbered A1 has a first transition zone 12 at a radius of 2.5 mm with an additional refractive power of +1.5 D; the first contact lens numbered A2 has a first transition zone 12 at a radius of 2.5 mm with an additional refractive power of +2.5 D; and the first contact lens numbered A3 has a first transition zone 12 at a radius of 2.5 mm with an additional refractive power of +3.5 D. In other examples not shown, the first contact lenses A1, A2, and A3 may have a first transition zone 12 at a radius of 2.5 mm with an additional refractive power of +3.5 D.

[0063] Similarly, each of the second contact lenses B1, B2, and B3 has a different second transition zone additional refractive power at a radius of 2.5 mm compared to the second prescription refractive power, and the second transition zone additional refractive power of the series of second contact lenses B1, B2, and B3 is set to cover an additional refractive power range of -3D to -1.5D. Figure 3 In the second contact lens group B consisting of 4 second contact lens groups B, the second contact lens numbered B1 has an additional refractive power of -1.5D in its second transition zone at a radius of 2.5mm; the second contact lens numbered B2 has an additional refractive power of -1.5D in its second transition zone at a radius of 2.5mm; and the second contact lens numbered B3 has an additional refractive power of -2.5D in its second transition zone at a radius of 2.5mm.

[0064] When the first and second contact lens sets A and B are provided with the aforementioned first and second transition zone additional refractive powers at 2.5 mm on their respective contact lenses, the overall refractive powers of the first and second contact lens sets A and B transition to the refractive powers required for good visual acuity at intermediate and near distances at these locations. Furthermore, according to the inventors' tests, providing the aforementioned transition zone additional refractive powers in the 5 mm diameter region of the contact lenses can achieve relatively good visual acuity for both eyes at long, intermediate, and near distances. Specific examples are provided below in conjunction with Figure 4 Related description.

[0065] Combine Figure 3 Continuing with the explanation, as shown in the figure, among the second contact lenses in the series B1, B2, and B3, the second contact lens B3, which has the largest span of the second transition zone 22 refractive power distribution, has the smallest absolute value of the second prescription refractive power. Among the second contact lenses in the series B1, B2, and B3, the second contact lens B3, which has the largest span of the second transition zone refractive power distribution, has the largest radius of the second central optical zone 21. This second contact lens B3 is suitable for patients with higher presbyopia. The larger radius of the second central optical zone 21 is more conducive to meeting the near vision needs of patients with higher presbyopia.

[0066] like Figure 2 As shown, the first contact lens group A comprises three groups of first contact lenses A1, A2, and A3. The additional refractive powers of the first peripheral optical zones 13 of the first contact lenses A1, A2, and A3 of different groups gradually increase. Figure 3 As shown, the three sets of second contact lenses B1, B2, and B3 in the second contact lens set B have gradually increasing add refractive powers in the second peripheral optical zones 23 of the different sets of second contact lenses B1, B2, and B3. First contact lenses with greater peripheral add refractive powers and second contact lenses with less peripheral add refractive powers are suitable for patients with greater presbyopia.

[0067] The outer diameter of the second transition zone 22 is selected from any value within the range of 6.4 mm to 7.6 mm, and the radii of the central optical zones of at least some of the second contact lenses Bl, B2, B3 of the series are different from each other.

[0068] In addition, the present disclosure also relates to a method for fitting a lens applicable to any of the above contact lens combinations, wherein the method comprises:

[0069] Optometry steps: Use testing equipment to determine the patient's refractive parameters for both eyes, including dominant and non-dominant eyes. Refractive parameters include hyperopia and presbyopia. Testing equipment can include OCT, corneal topographers, fundus cameras, biometers, and others. Dominance can be confirmed using testing equipment or directly by an ophthalmologist.

[0070] Step 1: Select the first trial lens set according to the following table 1. The first trial lens set is the recommended trial lens set. In table 1, contact lens combinations are divided into 4 levels.

[0071] Appendix 1

[0072]

[0073] Trial lens set refraction step: After a predetermined period of time after the patient wears the first trial lens set, the patient's distance and near vision in both eyes is verified under bright and dark field conditions. If the verification results meet the visual requirements, the parameters of the first trial lens set are selected as the patient's desired lens set. If the verification results do not meet the visual requirements, the process proceeds to the next step. The predetermined time can be set between 10 and 15 minutes.

[0074] Initial adjustment of the trial lens set: If the patient's distance vision is found to be insufficient during the trial lens set refraction step, the prescription refractive powers of the first contact lenses A1, A2, and A3 (including the distance vision prescription refractive power and the near vision prescription refractive power) in the trial lens set selection step are adjusted in steps of ±0.25D. If the patient's near vision is found to be insufficient during the trial lens set refraction step, the prescription refractive powers of the second contact lenses B1, B2, and B3 in the trial lens set selection step are adjusted in steps of ±0.25D, and the trial lens set refraction step is re-entered.

[0075] In the above-mentioned method for fitting glasses, the following trial lens set polyadjustment step may also be provided: when the number of iterations of the trial lens set refraction step and the trial lens set initial adjustment step reaches two, the trial lens set polyadjustment step is entered, wherein, in the trial lens set polyadjustment step, the first contact lenses A1, A2, A3 and the second contact lenses B1, B2, B3 are replaced in accordance with the table of the trial lens set selection step by increasing or decreasing the levels in the last trial lens set initial adjustment step, and the trial lens set refraction step is re-entered. For example, if the number of iterations of the trial lens set refraction step and the trial lens set initial adjustment step reaches two, that is, after trying on trial lenses with different prescription refractive powers twice, the patient's visual acuity still does not meet the requirements, then the corresponding specifications of the trial lenses are replaced, and the previous steps are repeated. For example, in the process of trying on trial lenses with different prescription refractive powers twice, the corresponding trial lenses use a contact lens combination of the first contact lens A2 and the second contact lens B3, and thereafter the contact lens combination of the first contact lens A3 and the second contact lens B3 or the contact lens combination of the first contact lens A1 and the second contact lens B2 can be changed to be tried on again.

[0076] See also Figure 4 The figure shows the binocular vision of a patient with myopia -3.00D and presbyopia +1.5D after wearing the above contact lens combination according to the present disclosure. Figure 4 In the table, "-3D single vision lens" means the vision state when both eyes wear a contact lens combination with a single refractive power of -3D, i.e. "State 1"; "-3D+1.5ADD-D" means the vision state when both eyes wear a first contact lens A1 with a basic refractive power of -3D, i.e. "State 2"; "-3D+1.5ADD-N" means the vision state when both eyes wear a second contact lens B2 with a basic refractive power of -3D, i.e. "State 3"; "Binocular N+D lens" means the vision state when the dominant eye wears the first contact lens A1 with a basic refractive power of -3D, and the non-dominant eye wears the second contact lens B2 with -3D, i.e. "State 4". Figure 4 It can be seen that when not wearing glasses, the wearer only maintains a certain near vision, and the middle and far vision are weak; in state 1, the far vision is greatly improved, but the near vision is significantly weakened; in state 2, the wearer's far vision and middle vision are significantly improved, and the near vision is slightly weakened; in state 3, the wearer's near vision and middle vision are significantly improved, and the far vision is slightly improved; in state 4, the wearer's near vision, far vision, and middle vision are significantly improved.

[0077] The scope of protection of the present disclosure is limited only by the claims. Thanks to the teachings of this disclosure, those skilled in the art will readily recognize that alternative structures to the structures disclosed in this disclosure can be used as feasible alternative embodiments, and that the embodiments disclosed in this disclosure can be combined to produce new embodiments, which also fall within the scope of the appended claims.

[0078] First contact lens group: A.

[0079] First contact lenses: A1, A2, A3.

[0080] Second contact lens group: B.

[0081] Second contact lens: B1, B2, B3.

[0082] First central optical zone:11.

[0083] Second central optical zone: 21.

[0084] First transition zone: 12.

[0085] Second transition zone: 22.

[0086] First peripheral optical zone:13.

[0087] Second peripheral optical zone: 23.

Claims

1. A contact lens assembly, comprising: a first contact lens set comprising a series of first contact lenses adapted to a patient's dominant eye, the first contact lenses comprising a first central optical zone located in a central area, a first peripheral optical zone located in a peripheral area thereof, and a first transition zone between the first central optical zone and the first peripheral optical zone, wherein the first central optical zone has a first prescription refractive power based on the patient's distance vision prescription, the first transition zone has a first transition refractive power distribution covering the distance vision prescription and the near vision prescription of the dominant eye, and the first transition refractive power distribution has a first peripheral refractive power at an outer edge of the first transition zone, the first contact lenses in the series have different first transition refractive power distributions, and the first peripheral refractive powers of the first contact lenses in the series cover an additional refractive power range of +2D to +6.5D relative to the first prescription refractive power, and the first transition refractive power distribution smoothly transitions from the first prescription refractive power to the first peripheral refractive power; and a second contact lens set comprising a series of second contact lenses adapted for a non-dominant eye of a patient, the second contact lenses comprising a second central optical zone located in a central area, a second peripheral optical zone located in a peripheral area thereof, and a second transition zone between the second central optical zone and the second peripheral optical zone, wherein the second central optical zone has a second prescription refractive power based on a near vision prescription of the patient, the second transition zone has a second transition refractive power distribution covering a near vision prescription and a distance vision prescription of the non-dominant eye, the second transition refractive power distribution has a second peripheral refractive power at an outer edge of the second transition zone, the second contact lenses in the series have different second transition refractive power distributions, and the second peripheral refractive powers of the second contact lenses in the series cover an additional refractive power range of -4.5D to -2.4D relative to the second prescription refractive power, and the second transition refractive power distribution smoothly transitions from the second prescription refractive power to the second peripheral refractive power, Wherein, the first transition refractive power distribution and the second transition refractive power distribution have opposite changing trends, and Among the second contact lenses in the series, the second contact lens having the largest span of the second transition refractive power distribution has the smallest absolute value of the second prescription refractive power.

2. The contact lens assembly according to claim 1, wherein: Each of the first contact lenses has a first transition zone additional refractive power at a radius of 2.5 mm that is different from the first prescription refractive power, and the first transition zone additional refractive power of the series of the first contact lenses covers an additional refractive power range of +1.5D to +4.5D relative to the first prescription refractive power.

3. The contact lens assembly according to claim 2, wherein: Each of the second contact lenses has a different second transition zone additional refractive power at a radius of 2.5 mm compared to the second prescription refractive power, and the second transition zone additional refractive power of the series of the second contact lenses covers an additional refractive power range of -3D to -1.5D relative to the second prescription refractive power.

4. The contact lens assembly according to any one of claims 1 to 3, wherein: The radius of the first central optical zone is any value within the range of 0.9 mm to 1.25 mm.

5. The contact lens assembly according to claim 4, wherein: The radius of the second central optical zone is any value within the range of 0.75 mm to 1.25 mm, and the radius of the first central optical zone is not less than the radius of the second central optical zone.

6. The contact lens assembly according to claim 5, wherein: Among the second contact lenses in the series, the second contact lens having the largest span of the second transition refractive power distribution has the largest second central optical zone radius.

7. The contact lens assembly according to claim 4, wherein: The outer diameter of the first transition zone is selected from any value within the range of 6.4 mm to 7.6 mm; and / or The outer diameter of the second transition zone is selected from any value within the range of 6.4 mm to 7.6 mm, and the radii of the central optical zones of at least a portion of the second contact lenses in the series are different from each other.

8. The contact lens assembly according to claim 4, wherein: The first contact lens group comprises at least three groups of first contact lenses, wherein the add refractive powers of the first peripheral optical zones of different groups of first contact lenses gradually increase; and / or The second contact lens group comprises at least three groups of second contact lenses, and the add refractive powers of the second peripheral optical zones of different groups of second contact lenses gradually increase.

9. A method for fitting glasses, the method being applicable to any one of the contact lens combinations according to claims 1 to 8, the method comprising: an optometry step, using a detection device to determine the refractive parameters of the patient's eyes, the dominant eye, and the non-dominant eye, wherein the refractive parameters include hyperopia and presbyopia; The step of selecting a trial lens set is to select the first trial lens set according to the following table; A trial lens set optometry step, wherein after a predetermined period of time after the patient has worn the first trial lens set, the patient's binocular distance and near vision in both bright and dark fields are verified. If the verification results meet the visual requirements, the parameters of the first trial lens set are selected as the parameters of the lens set required by the patient. If the verification results do not meet the visual requirements, the process proceeds to the next step; The initial adjustment step of the trial lens set. When the patient's distance vision is found to be insufficient in the trial lens set optometry step, the prescription refractive power of the first contact lens in the optional trial lens set step is adjusted according to the step size of ±0.25D. When the patient's near vision is found to be insufficient in the trial lens set optometry step, the prescription refractive power of the second contact lens in the optional trial lens set step is adjusted according to the step size of ±0.25D, and the trial lens set optometry step is re-entered.

10. The method for fitting glasses according to claim 9, wherein: The method for fitting glasses also includes a trial lens set polyadjustment step. When the number of sequential iterations of the trial lens set refraction step and the trial lens set initial adjustment step reaches 2, the trial lens set polyadjustment step is entered. In the trial lens set polyadjustment step, the first contact lens and the second contact lens are replaced in a manner of increasing or decreasing the level in the last trial lens set initial adjustment step according to the appendix of the trial lens set selection step, and the trial lens set refraction step is re-entered.

11. The method for fitting glasses according to claim 9 or 10, wherein: The predetermined time is 10-15 minutes.

Images