CN118859554A - Contact lens combination and its fitting method - Google Patents

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 far 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, and the first transition refractive power distribution and the second transition refractive power distribution have opposite changing trends. The contact lens combination can improve the far, near and intermediate distance vision of presbyopic patients.

Description

Contact lens combination and its fitting method

Technical Field

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

Background Art

People may have various types of refractive errors due to improper use of the eyes, heredity and normal physiological development. Refractive errors manifest as blurred vision. An increasing proportion of people suffer from refractive errors. Refractive errors can be divided into categories: myopia, hyperopia (farsightedness), astigmatism and presbyopia. Each of these refractive errors can be corrected by wearing frame lenses or contact lenses.

Presbyopia, or old eyesight, is a physiological phenomenon. It is neither a pathological condition nor a refractive error. It is a visual problem that will inevitably occur when people enter middle age or old age. Presbyopia is one of the signs that the body is beginning to age. As we age, the lens of the eye gradually hardens and thickens, and the adjustment ability of the eye muscles also decreases, resulting in a decrease in the ability to zoom. Therefore, when looking at close objects, the image cannot be fully focused when projected onto the retina, and the objects at close range will become blurry.

There are traditional single-vision (single-focus) lenses on the market, as well as bifocal (bifocal) and progressive multifocal lenses that have appeared in recent years, which are used to correct presbyopia. Among them, bifocal lenses 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 crystalline lens accommodation. Bifocal lenses are lenses 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 the bifocal lenses, they are prone to blurred vision when their vision adjusts from far to near. This is because bifocal lenses lack an area with a 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, the line of sight will pass through the middle distance zone, and the lens cannot provide the corresponding vision compensation function at this time.

Among these lenses, progressive multifocal lenses are those that have different areas on the same lens that correspond to near vision, intermediate vision, and far vision. This lens solves the problem of blurred vision in the middle caused by bifocals and is the most ideal method for correcting presbyopia. It ensures clear near vision while also ensuring good intermediate and far vision. However, there is a certain distance between the lens of the frame glasses and the vertex of the cornea, which results in a certain magnification of the high-power lens, which can easily cause discomfort and dizziness to the wearer.

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.

Public Content

In view of the above-mentioned current status 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 contact lenses that ensure that presbyopic patients can obtain good visual effects in near, medium and far vision and are less affected by pupil size in different light fields.

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

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 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 of the series have different first transition refractive power distributions, and the first peripheral refractive powers of the first contact lenses of 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 to 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 of the series have different second transition refractive power distributions, and the second peripheral refractive powers of the second contact lenses of 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.

Preferably, each of the first contact lenses has a first transition zone additional refractive power different from the first prescription refractive power at its radius 2.5 mm, 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.

Preferably, each of the second contact lenses has a different second transition zone additional refractive power compared to the second prescription refractive power at its radius 2.5 mm, 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.

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.

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

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.

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

Preferably, the outer diameter of the first transition zone is selected from any value in 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.

Preferably, the first contact lens group comprises at least 3 groups of first contact lenses, and the additional refractive powers of the first peripheral optical zones of different groups of the first contact lenses gradually increase; and/or

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

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 for fitting a lens comprises:

An optometry step, using a detection device to determine the refractive parameters of both eyes of the patient, the dominant eye and the non-dominant eye, wherein the refractive parameters include the hyperopia diopter and the presbyopia diopter;

A step of selecting a trial lens set, in which the first trial lens set is selected according to the following table;

The optometry step of the trial lens set is to verify the patient's binocular distance vision and near vision in bright field and dark field state after a predetermined time after the patient wears the first trial lens set. If the verification result meets the vision requirement, the parameters of the first trial lens set are selected as the parameters of the lens set required by the patient. If the verification result does not meet the vision requirement, the next step is entered;

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.

Preferably, the glasses fitting method further comprises a trial lens set polyadjustment step, and 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, wherein, in the trial lens set polyadjustment step, according to the appendix of the trial lens set selection step, the first contact lens and the second contact lens are replaced in a manner of increasing or decreasing the level in the previous last trial lens set initial adjustment step, and the trial lens set refraction step is re-entered.

Preferably, the predetermined time is 10-15 minutes.

Based on the common sense in the art, the above-mentioned preferred implementation modes can be arbitrarily combined to obtain the preferred embodiments of the present disclosure.

In the contact lens combination designed in the present disclosure, different forms of central optical zones and transition zones are respectively set for the dominant eye and the non-dominant eye. First, the respective special refractive power distributions of the first transition zone and the second transition zone of the first contact lens group and the second contact lens group, combined with the distance vision correction effect of the first central optical zone and the near vision correction effect of the second central optical zone, can ensure good near, medium and far distance vision requirements for presbyopic patients, and are minimally affected by pupil size in different light and dark light fields.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to better understand the above and other purposes, features, advantages and functions of the present disclosure, reference may be made to the preferred embodiments shown in the accompanying drawings. The same reference numerals in the accompanying drawings refer to the same components. It should be understood by those skilled in the art that the accompanying drawings are intended to schematically illustrate the preferred embodiments of the present disclosure and have no limiting effect on the scope of the present disclosure, and the components in the drawings are not drawn to scale.

FIG1 is a schematic structural diagram of the front side of a spectacle lens according to a preferred embodiment of the present disclosure;

FIG2 is a diagram showing the refractive power distribution of each first contact lens of the first contact lens group according to a preferred embodiment of the present disclosure;

FIG3 is a diagram showing the refractive power distribution of each second contact lens of the second contact lens set according to a preferred embodiment of the present disclosure;

Figure 4 shows the visual effects of a patient wearing different contact lens combinations.

DETAILED DESCRIPTION

Next, the disclosed concept of the present disclosure will be described in detail with reference to the accompanying drawings. Described here are only preferred embodiments according to the present disclosure, and those skilled in the art may think of other ways to implement the present disclosure on the basis of the preferred embodiments, 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", etc. 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 used for illustrative purposes and are not restrictive.

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 embedding into 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 cornea or limbus of the human eye; scleral contact lenses usually land on the sclera; corneoscleral contact lenses usually land on the limbus or on the limbus and sclera. The contact lens can be a soft contact lens, such as a hydrogel contact lens, 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.

FIG1 shows a 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. This view shows the first contact lens (the second contact lens) from a perspective corresponding to the front of the center of the contact lens. The front side of the contact lens is the surface facing away from the human eye (referred to as the "external surface" or "front surface"); the back side of the contact lens is the surface in contact with the human eye (referred to as the "inner surface" or "back surface").

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. Among them, each first contact lens A1, A2, A3 of the first contact lens group A includes, from the inside to the outside, a first central optical zone 11, a first transition zone 12, and a first peripheral optical zone 13; each second contact lens B1, B2, B3 of the second contact lens group B includes, from the inside to the outside, a second central optical zone 21, a second transition zone 22, and a second peripheral optical zone 23. In the examples of Figures 2 and 3, the boundaries of each subarea of each first contact lens A1, A2, A3, and second contact lens B1, B2, B3 are inflection points in the refractive power distribution curve of the corresponding contact lens.

The first contact lens set A disclosed in the present invention includes a series of first contact lenses A1, A2, and A3 adapted to the dominant eye of the patient. The "dominant eye" involved in the present invention is also called the main eye or dominant eye. The dominant eye refers to the eye that occupies a dominant position in the process of receiving visual information. There are many methods in the prior art to detect the dominant eye of the patient, so the confirmation of the dominant eye will not be repeated here.

The “far vision” referred to in the present 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 observe distant objects to obtain ideal visual sensitivity.

The “near vision” referred to in the present 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 observe close objects to obtain ideal visual sensitivity.

The relevant expressions of "radius" in the present 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.

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.

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 selects a larger value of the above interval value 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 wearing effect of the patient, in a more preferred manner, the radius of the first central optical zone 11 is set to 1mm-1.2mm. For example, in the example of FIG. 2, the radius of the first central optical zone 11 is set to 1.15mm. The first central optical zone 11 of this example is particularly suitable for East Asians. It can be understood that according to the pupil size and individual perception, the radius of the first central optical zone 11 can also be set to 1mm, 1.1mm, 1.2mm, etc.

The first transition zone 12 has a first transition refractive power distribution covering the distance vision prescription and the near vision prescription of the dominant eye. On the basis of satisfying the dominant eye to obtain good distance vision, in order to obtain a certain near vision and avoid the dizziness caused by the contact lens during the transition process between distance vision and near vision, each of the first contact lenses A1, A2, and A3 of the present disclosure is set with a wider width. In the case where the first central optical zone 11 is set in the above-mentioned radius range, the outer diameter of the first transition zone 12 is set to any value selected from the range of 6.4mm-7.6mm, such as 7mm shown in FIG. 2, and 6.8mm, 7.2mm, etc. not shown.

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 above-mentioned first prescription refractive power to the above-mentioned first peripheral refractive power. In the present disclosure, the first transition refractive powers of the series of first contact lenses A1, A2, A3 are all different, and the first peripheral refractive powers of the series of first contact lenses A1, A2, A3 cover a larger range. Specifically, the first peripheral refractive power of the series of first contact lenses A1, A2, A3 covers an additional refractive power range of +2D to +6.5D relative to the above-mentioned first prescription refractive power. As a result, the first transition zone 12 covers the distance vision prescription and the near vision prescription of the presbyopic patient, and the coverage range also exceeds the distance vision prescription and the near vision prescription. Due to the smooth refractive power distribution adopted by the first central optical zone 11 and the first transition zone 12 of the first contact lenses A1, A2, A3, the wearer's dominant eye will not have too obvious differences in the transition process between far vision and near vision.

In the example of FIG2 , although the first peripheral refractive power of the series of first contact lenses A1, A2, A3 only covers the additional refractive power range of +2.6D to +6.1D relative to the above-mentioned first prescription refractive power, in other examples not shown, the coverage range of the first peripheral refractive power of the series of first contact lenses A1, A2, A3 can be appropriately expanded, which can be achieved by increasing the number of the series of first contact lenses and/or increasing the first peripheral refractive power difference between the first contact lenses of each level.

2, 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.

The first peripheral optical zone 13 includes a landing area for ensuring the wearing firmness of the contact lens and the tear exchange quality of the inner and outer areas of the contact lens, and an edge warp for ensuring the tear exchange quality of the inner and outer areas of the contact lens and the wearing comfort. Depending on the specific type of the contact lens, the landing area corresponds to different areas of the user's eyes. For example, for a scleral contact lens, the landing area corresponds to the sclera of the eye. As for the landing area and the edge warp, they are not the focus of this article, and will not be described in detail in this article.

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 in 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 to the dominant eye of the wearer, the radius of the second central optical zone 21 adapted to the non-dominant eye of the wearer is designed to be the same size as it, or to be designed to have a smaller value. In combination with Figures 2 and 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, A3 is 1.15mm, while in the series of second contact lenses B1, B2, B3, the radius of the second central optical zone 21 of the second contact lenses B1, B2 is 0.85mm, and only the radius of the second central optical zone 21 of the second contact lens B3 is set to 1.15mm.

The second transition zone 22 of the second contact lens B1, B2, B3 has a second transition refractive power distribution covering 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 from a near vision prescription to a distance vision prescription. The second transition refractive power distribution smoothly transitions from the second prescription refractive power to the second peripheral refractive power.

Based on the similar design mechanism of the first peripheral optical zone 13 of the above-mentioned first contact lenses A1, A2, A3, a landing zone for ensuring the firmness of the contact lens wearing and the quality of tear exchange between the inner and outer areas of the contact lens, as well as edge warping for ensuring the quality of tear exchange between 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, B3.

Combining Figures 2 and 3, it can be seen that the first transitional refractive power distributions of the first contact lens set A matched with the dominant eye are generally increasing, while the second transitional refractive power distributions of the second contact lens set B matched with the non-dominant eye are generally decreasing. The changing trends of the first transitional refractive power distribution and the second transitional refractive power distribution are opposite to each other.

As can be seen from Figures 2 and 3, in the contact lens combination disclosed in the present invention, the first central optical zone 11 of the first contact lens group A ensures far vision; the second central optical zone 21 of the second contact lens group B ensures near vision. The first transitional refractive power distribution and the second transitional refractive power distribution with opposite changes, and the design of each transitional refractive power distribution spanning near vision prescription and far vision prescription, ensure that the wearer obtains higher visual acuity under various distance conditions when using the contact lens combination. This design can actually have a certain preventive effect on the further deterioration of presbyopia to a certain extent.

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

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. At this time, the refractive power distribution in each meridian direction can be mathematically summed according to the refractive power distribution shown in Figures 2 and 3. In order to accommodate patients with astigmatism, etc., the contact lens can use a technology that ensures that the contact lens does not rotate as much as possible in the peripheral optical zone, such as prism ballast, double slab-off and truncation, etc. Such technology is basically a specific design in the peripheral optical zone of the contact lens. These designs are conventional designs and are therefore not described in detail.

As a preferred mode, 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 prescription refractive power in its meridian direction without any additional refractive power or fluctuating refractive power distribution, so as 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.

In the second contact lens set B, the second central optical zone 21 of the second contact lenses B1, B2, B3 is provided with a single refractive power corresponding to the second prescription refractive power in the meridian direction without any additional refractive power or fluctuating refractive power distribution, so as 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, B3 is provided with a single refractive power.

Preferably, each of the first contact lenses A1, A2, A3 has a different first transition zone additional refractive power at a radius of 2.5 mm compared to the first prescription refractive power, and the first transition zone additional refractive power of the series of first contact lenses A1, A2, A3 is set to cover the additional refractive power range of +1.5D to +4.5D. For example, in the first contact lens group A consisting of three first contact lens groups A shown in FIG2, the first contact lens numbered A1 has an additional refractive power of +1.5D in the first transition zone 12 at a radius of 2.5 mm; the first contact lens numbered A2 has an additional refractive power of +2.5D in the first transition zone at a radius of 2.5 mm; and the first contact lens numbered A3 has an additional refractive power of +3.5D in the first transition zone at a radius of 2.5 mm. In other examples not shown, the first transition zone additional refractive power of the first contact lenses A1, A2, A3 at a radius of 2.5 mm can be set to a larger value, such as +4.5D.

Similarly, each second contact lens B1, B2, 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, B3 is set to cover the additional refractive power range of -3D to -1.5D. For example, in the second contact lens set B consisting of four second contact lenses shown in FIG3, the second contact lens numbered B1 has a second transition zone additional refractive power of -1.5D at a radius of 2.5 mm; the second contact lens numbered B2 has a second transition zone additional refractive power of -1.5D at a radius of 2.5 mm; and the second contact lens numbered B3 has a second transition zone additional refractive power of -2.5D at a radius of 2.5 mm.

When the first contact lens group A and the second contact lens group B are provided with the first transition zone additional refractive power and the second transition zone additional refractive power at 2.5 mm of their respective contact lenses, the overall refractive power of the first and second contact lens groups A and B transitions to the required refractive power for good visual acuity at medium and near distances at this position. Moreover, according to the inventor's test, by providing the above transition zone additional refractive power in the 5 mm diameter area of the contact lens, relatively good effects can be achieved in the long-distance, medium-distance and near-distance visual acuity of binocular vision, and specific examples are shown in the following description in conjunction with FIG. 4 .

Continuing the description in conjunction with FIG. 3 , as shown in the figure, among the series of second contact lenses B1, B2, and B3, the second contact lens B3 with 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 series of second contact lenses B1, B2, and B3, the second contact lens B3 with the largest span of the second transition refractive power distribution has the largest radius of the second central optical zone 21. The second contact lens B3 is suitable for patients with a higher degree of presbyopia. A larger radius of the second central optical zone 21 is more conducive to meeting the near vision needs of patients with a higher degree of presbyopia.

As shown in FIG2 , the first contact lens group A has three groups of first contact lenses A1, A2, and A3. The additional refractive power of the first peripheral optical zone 13 of the first contact lenses A1, A2, and A3 of different groups gradually increases. As shown in FIG3 , the second contact lens group B has three groups of second contact lenses B1, B2, and B3. The additional refractive power of the second peripheral optical zone 23 of the second contact lenses B1, B2, and B3 of different groups gradually increases. The first contact lens with a larger peripheral additional refractive power and the second contact lens with a smaller peripheral additional refractive power are suitable for patients with a larger degree of presbyopia.

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 a portion of the series of second contact lenses B1, B2, B3 are different from each other.

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 for fitting a lens comprises:

Optometry steps: Use testing equipment to determine the refractive parameters of the patient's eyes, dominant eye and non-dominant eye, where the refractive parameters include hyperopia and presbyopia. Testing equipment can be selected from OCT, corneal topograph, fundus camera, biometer, etc. The dominant eye and non-dominant eye can be confirmed by testing equipment or by direct testing by an ophthalmologist.

Step of selecting a trial lens set: In this step, the first trial lens set is selected according to the contents of the following Appendix 1, and the first trial lens set is the first recommended trial lens set. In Appendix 1, contact lens combinations are divided into 4 levels.

Schedule 1

Trial lens set optometry step: After the patient wears the first trial lens set for a predetermined time, verify the patient's binocular distance vision and near vision in bright field and dark field. If the verification result meets the vision 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 result does not meet the vision requirements, proceed to the next step. Here, the predetermined time can be set between 10-15 minutes.

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 (including the distance vision prescription refractive power and the near vision prescription refractive power) of the first contact lenses A1, A2, and A3 in the optional trial lens set step is adjusted in steps 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 lenses B1, B2, and B3 in the optional trial lens set step is adjusted in steps of ±0.25D, and the above trial lens set optometry step is re-entered.

In the above-mentioned method for fitting glasses, the following trial lens set polyadjustment step can also be set: when the number of iterations of the trial lens set optometry step and the trial lens set initial adjustment step reaches 2, the trial lens set polyadjustment step is entered, wherein, in the trial lens set polyadjustment step, according to the appendix of the trial lens set selection step, the first contact lens A1, A2, A3 and the second contact lens B1, B2, B3 are replaced in a manner of increasing or decreasing the level in the last trial lens set initial adjustment step, and the trial lens set optometry step is re-entered. For example, after the number of iterations of the trial lens set optometry step and the trial lens set initial adjustment step reaches 2, that is, after trying on trial lenses with different prescription refractive powers twice, the patient's visual acuity still does not meet the requirements, at this time, 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 a first contact lens A2 and a second contact lens B3, and thereafter the contact lens combination of a first contact lens A3 and a second contact lens B3 or a contact lens combination of a first contact lens A1 and a second contact lens B2 can be changed to be tried again.

Referring to FIG4 , a patient with myopia of -3.00D and presbyopia of +1.5D is shown, and the binocular vision of the patient after both eyes are wearing the above contact lens combination according to the present disclosure. In FIG4 , "-3D single vision lens" indicates the visual state when both eyes are wearing a contact lens combination with a single refractive power of -3D, i.e., "state 1"; "-3D+1.5ADD-D" indicates the visual state when both eyes are wearing a first contact lens A1 with a basic refractive power of -3D, i.e., "state 2"; "-3D+1.5ADD-N" indicates the visual state when both eyes are wearing a second contact lens B2 with a basic refractive power of -3D, i.e., "state 3"; "binocular N+D lens" indicates the visual 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". From 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 relatively 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.

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

First contact lens set: A.

First contact lens: A1, A2, A3.

Second contact lens group: B.

Second contact lens: B1, B2, B3.

First central optical zone:11.

Second central optical zone:21.

First transition zone:12.

Second transition zone: 22.

First peripheral optical zone:13.

Second peripheral optical zone:23.

Claims (12)

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 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 of the series have different first transition refractive power distributions, and the first peripheral refractive powers of the first contact lenses of 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 to 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 of the series have different second transition refractive power distributions, and the second peripheral refractive powers of the second contact lenses of 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. 2. A contact lens combination according to claim 1, wherein each of the first contact lenses 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 the first contact lenses covers an additional refractive power range of +1.5D to +4.5D relative to the first prescription refractive power. 3. A contact lens combination 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 combination according to claim 3, 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 smallest absolute value of the second prescription refractive power. 5. The contact lens combination according to any one of claims 1 to 4, wherein the radius of the first central optical zone is any value within the range of 0.9 mm to 1.25 mm. 6. The contact lens combination according to claim 5, wherein the radius of the second central optical zone is any value within the range of 0.75 mm-1.25 mm, and the radius of the first central optical zone is not less than the radius of the second central optical zone. 7. The contact lens combination according to claim 6, 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. 8. The contact lens assembly according to claim 5, wherein the outer diameter of the first transition zone is selected from any value in 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. 9. The contact lens assembly according to claim 5, wherein the first contact lens group comprises at least 3 groups of first contact lenses, and the additional refractive powers of the first peripheral optical zones of different groups of the first contact lenses gradually increase; and/or The second contact lens group comprises at least three groups of second contact lenses, and the additional refractive powers of the second peripheral optical zones of different groups of second contact lenses gradually increase. 10. A method for fitting glasses, the method being applicable to any one of the contact lens combinations according to claims 1 to 9, the method comprising: An optometry step, using a detection device to determine the refractive parameters of both eyes of the patient, the dominant eye and the non-dominant eye, wherein the refractive parameters include the hyperopia diopter and the presbyopia diopter; A step of selecting a trial lens set, in which the first trial lens set is selected according to the following table; The optometry step of the trial lens set is to verify the patient's binocular distance vision and near vision in bright field and dark field state after a predetermined time after the patient wears the first trial lens set. If the verification result meets the vision requirement, the parameters of the first trial lens set are selected as the parameters of the lens set required by the patient. If the verification result does not meet the vision requirement, the next step is entered; 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. 11. The method for fitting glasses according to claim 10, wherein the method further comprises a trial lens set polyadjustment step, and 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, wherein, in the trial lens set polyadjustment step, according to the appendix of the trial lens set selection step, the first contact lens and the second contact lens are replaced in a manner of increasing or decreasing the level in the last previous trial lens set initial adjustment step, and the trial lens set refraction step is re-entered. 12. The method for fitting glasses according to claim 10 or 11, wherein the predetermined time is 10-15 minutes.