A variable-focus scleral lens and a method for changing the focus thereof

Abstract

The present invention relates to a variable-focus scleral lens and a method for variable-focusing the scleral lens. The variable-focus scleral lens comprises an inner arc surface and an outer arc surface. The inner arc surface can be supported on the sclera, and the center of the outer arc surface is provided with a first optical zone and a second optical zone which are continuously concentric from the inside to the outside along the radial direction, and the first optical zone and the second optical zone can be located above the cornea. The second optical zone is larger than the vertical projection area of ​​the first optical zone. The refractive power of the second optical zone is myopia refractive power; or, hyperopia refractive power; or, astigmatism refractive power; or, the superposition of myopia refractive power and astigmatism refractive power; or, the superposition of hyperopia refractive power and astigmatism refractive power; the refractive power of the second optical zone gradually increases the positive spherical power from the outside to the inside along the radial direction; the refractive power of the first optical zone is an optometry near prescription. In conjunction with the automatic pupil expansion and contraction mechanism, the near vision and zoom far vision requirements of presbyopic patients suffering from keratoconus, high refractive error, dry eye disease, corneal trauma, etc. when wearing scleral lenses are met.

Description

Technical Field

[0001] The present invention relates to the technical field of contact lenses, and in particular to a variable-focus scleral lens and a method for variable-focusing the lens. Background Art

[0002] Scleral lenses are specially designed large-diameter rigid gas-permeable contact lenses. In a broad sense, scleral lenses include corneoscleral lenses and full scleral lenses. The former refers to the lens landing area partially on the cornea and partially on the sclera; the latter refers to the lens landing area completely on the anterior surface of the sclera.

[0003] Among them, full scleral lenses have less stimulation to the cornea and can protect the diseased cornea. They are suitable for people with corneal diseases such as irregular corneal astigmatism, severe dry eyes, corneal degeneration or malnutrition, corneal trauma, etc. They can effectively improve the visual quality and life of patients with various eye diseases.

[0004] For older patients, their eyes also have a decline in eye accommodation, which makes it difficult to see near objects, which is what we often call presbyopia. Existing scleral lenses can only correct long-distance vision. When presbyopic patients wear scleral lenses, they can see clearly at a distance, but their near vision is blurred because the image is formed in front of the retina, making it difficult to see near objects. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a variable-focus scleral lens and a method for variable-focusing the same, which solves the technical problem that the existing scleral lenses are not suitable for use by presbyopic patients.

[0007] (II) Technical solution

[0008] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0009] In a first aspect, an embodiment of the present invention provides a variable-focus scleral lens, comprising an inner curved surface and an outer curved surface;

[0010] The inner arc surface can be supported on the sclera, and the center of the outer arc surface is provided with a first optical zone and a second optical zone which are continuous and concentric from the inside to the outside in the radial direction, and the first optical zone and the second optical zone can be located above the cornea; the vertical projection area of ​​the second optical zone is larger than the vertical projection area of ​​the first optical zone;

[0011] The refractive power of the second optical zone is myopia refractive power; or, it is hyperopia refractive power; or, it is astigmatism refractive power; or, it is the superposition of myopia refractive power and astigmatism refractive power; or, it is the superposition of hyperopia refractive power and astigmatism refractive power; when the refractive power of the second optical zone includes myopia refractive power or hyperopia refractive power, the refractive power of the second optical zone gradually increases the positive spherical power from outside to inside along the radial direction; the refractive power of the first optical zone is an optometry near vision prescription.

[0012] According to the present invention, the vertical projection of the first optical zone is circular, and the vertical projection of the second optical zone is annular;

[0013] The second optical zone surrounds the outer periphery of the first optical zone;

[0014] The second optical zone includes a fixed ring and a plurality of zoom rings which are continuously concentric from the outside to the inside along the radial direction. The refractive powers of the fixed rings are the same and are for the optometry distance. The refractive powers of the plurality of zoom rings gradually increase in positive spherical power from the outside to the inside along the radial direction of the second optical zone. The spherical power of the innermost zoom ring is smaller than that of the first optical zone.

[0015] According to the present invention, the average change rate of the refractive power of the second optical zone from the outside to the inside along the radial direction is +0.25 to +1.50 D / mm.

[0016] According to the present invention, the vertical projection area of ​​the first optical zone is not less than the minimum vertical projection area of ​​the pupil, and is not greater than 2 / 3 of the maximum vertical projection area of ​​the pupil.

[0017] According to the present invention, the radius of the vertical projection of the first optical zone is 2±1.5 mm.

[0018] According to the present invention, the radius of the vertical projection of the outermost ring of the second optical zone is 8-10 mm.

[0019] According to the present invention, the inner arc surface is continuously and concentrically arranged with a base arc area, a transition area and a landing area from the inside to the outside in the radial direction;

[0020] The base curve area is spherical and its vertical projection is circular, and the base curve area can be located above the cornea;

[0021] The transition zone is aspherical and has a vertical projection of a ring shape, and the transition zone can be located above the corneoscleral limbus;

[0022] The base curve area and the transition area can form a tear chamber with the cornea;

[0023] The vertical projection of the landing area is annular, and the landing area can be supported on the sclera;

[0024] The height of the tear chamber is 100-300 μm;

[0025] The diameter of the vertical projection of the base arc area is 4-13.5 mm, and the sagitta is 0.24-2.85 mm;

[0026] The vertical projection diameter of the transition zone is 12-14 mm, and the sagittal height is 1.21-7.91 mm;

[0027] The diameter of the vertical projection of the landing area is 14-17 mm, and the arrow height is 0.9-5.98 mm.

[0028] According to the present invention, the outer arc surface is composed of a first optical zone, a second optical zone, and a peripheral arc zone concentrically nested on the periphery of the second optical zone;

[0029] The inner arc surface consists of the base arc area, the transition area and the landing area.

[0030] In a second aspect, the present invention further provides a zoom method using the variable-focus scleral lens:

[0031] When the pupil contracts to the point where the area of ​​the first optical zone falling within the vertical projection range of the pupil is larger than the area of ​​the second optical zone falling within the vertical projection range of the pupil, a clear image at a near distance can be acquired;

[0032] When the pupil is enlarged to the point where the area of ​​the second optical zone falling within the vertical projection range of the pupil is larger than the area of ​​the first optical zone falling within the vertical projection range of the pupil, a clear image at a distance can be acquired.

[0033] (III) Beneficial effects

[0034] The beneficial effects of the present invention are as follows: the variable-focus scleral lens and the zoom method thereof of the present invention, when the user wears the scleral lens, the optical axis of the scleral lens and the optical axis of the pupil are kept coaxial, and the first optical zone and the second optical zone provided on the outer arc surface of the scleral lens are used in conjunction with the automatic expansion and contraction mechanism of the pupil under light of different intensities, so as to simultaneously meet the near vision needs and far vision needs of presbyopic patients suffering from myopia or hyperopia or astigmatism or suffering from both myopia and astigmatism or suffering from both hyperopia and astigmatism (wherein, near refers to a relatively small distance between the eye and the observed object (generally within one meter), and far refers to a relatively long distance between the eye and the observed object (generally beyond one meter)), and the specific principles of near vision and far vision are as follows:

[0035] When near vision is needed: the external light is brightened to make the pupil contract to the point where the area within the vertical projection range of the first optical zone onto the pupil is larger than the area within the vertical projection range of the second optical zone onto the pupil. At this time, the brain receives relatively more clear near images projected onto the retina by the first optical zone, and can ignore the relatively blurred near images projected onto the retina by the second optical zone, and form a clear near image based on the analysis of the clear near images.

[0036] When far vision is required: the external light is dimmed to dilate the pupil until the area of ​​the second optical zone within the vertical projection range of the pupil is larger than the area of ​​the first optical zone within the vertical projection range of the pupil. At this time, the brain receives relatively more clear distant images projected onto the retina by the second optical zone, and can ignore the more blurred distant images projected onto the retina by the first optical zone, and can analyze and form distant images based on the clear distant images.

[0037] When it is necessary to observe objects at different distances, since the second optical zone is a zoom zone with gradually increasing positive spherical power from outside to inside along the radial direction, images of the distant object with different clarity can be projected onto the retina at different diopters, and the brain can select the image with better clarity projected at the diopters suitable for the distance from multiple images, and form the final distant image, thereby achieving zoom vision. Furthermore, the diopters of the second optical zone gradually increase positive spherical power from outside to inside along the radial direction, which can achieve continuous zoom, and can simultaneously project multiple images of the distant object with gradually changing clarity onto the retina when looking at the distance, avoiding the situation where the brain obtains a blurred image caused by image jump or light splitting under non-continuous step-by-step sharp changes.

[0038] Therefore, the variable-focus scleral lens can be supported on the sclera to avoid contact and damage to the cornea. Combined with the automatic expansion and contraction mechanism of the pupil under different light conditions, it can correct the focal position of the peripheral imaging of the retina when looking near and far, so as to meet the near and far vision needs of presbyopic patients with keratoconus, high refractive error, dry eye disease, corneal trauma, etc. when wearing scleral lenses. It also meets the needs of zoom and far vision for people with myopia or hyperopia. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A cross-sectional perspective view of the variable focus scleral lens of the present invention when worn;

[0040] Figure 2 is a cutaway perspective view of a variable focus scleral lens;

[0041] Figure 3 1 is a schematic diagram showing a side cross-sectional view and a top view of a variable focus scleral lens;

[0042] Figure 4It is a schematic diagram corresponding to the side view cross-sectional view and the top view of the variable focus scleral lens.

[0043] [Description of Reference Numerals]

[0044] 1: scleral lens; 11: inner arc surface; 12: outer arc surface; 13: first optical zone; 14: second optical zone; 15: base curve zone; 16: transition zone; 17: landing zone;

[0045] a: tear cavity;

[0046] A: sclera; B: cornea; C: limbus; D: iris; E: pupil. DETAILED DESCRIPTION

[0047] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0048] See also Figure 1-4 A variable-focus scleral lens proposed in an embodiment of the present invention includes an inner curved surface 11 and an outer curved surface 12.

[0049] The inner arc surface 11 can be supported on the sclera A. A first optical zone 13 and a second optical zone 14 are arranged at the center of the outer arc surface 12 , which are continuous and concentric from the inside to the outside in the radial direction.

[0050] The first optical zone 13 and the second optical zone 14 can be located above the cornea B. The vertical projection area of ​​the second optical zone 14 is larger than the vertical projection area of ​​the first optical zone 13. The refractive power of the second optical zone 14 is myopic refractive power; or, hyperopic refractive power; or, astigmatic refractive power; or, the superposition of myopic refractive power and astigmatic refractive power; or, the superposition of hyperopic refractive power and astigmatic refractive power. When the refractive power of the second optical zone 14 is myopic refractive power or hyperopic refractive power, the myopic refractive power or hyperopic refractive power of the second optical zone 14 gradually increases the positive spherical degree from the outside to the inside in the radial direction (that is, gradually increases the positive degree). The refractive power of the first optical zone 13 is an optometry near prescription. The refractive power of the inner edge of the second optical zone 14 is less than or equal to the refractive power of the first optical zone 13.

[0051] It should be noted that the cornea B of the eye covers the outside of the iris D, and there is a pupil E in the center of the iris D. Under different light intensities, the iris D can adjust the size of the pupil E accordingly to achieve automatic expansion and contraction of the pupil E. After wearing the scleral lens, the first optical zone 13 and the second optical zone 14 can be located above the cornea B, that is, the vertical projection range of the first optical zone 13 and the second optical zone 14 can cover the pupil E in the center of the iris D.

[0052] Among them, spherical power refers to the unit of myopia diopter, hyperopia diopter or presbyopia diopter.

[0053] The near vision prescription of the first optical zone 13 refers to the diopter obtained by an optometrist during an optometry examination of the wearer, which may be positive or negative.

[0054] Specifically, the setting principle of the first optical zone 13 and the second optical zone 14 is:

[0055] When the wearer is a presbyopic patient with astigmatism, the outer edge diopter of the second optical zone 14 can be set accordingly according to the astigmatism diopter obtained by the wearer's actual optometry, and the diopter of the second optical zone 14 can be gradually increased from the outside to the inside along the radial direction. Among them, when the diopter of the second optical zone 14 is astigmatism diopter, the gradually increasing positive spherical diopter from the outside to the inside along the radial direction refers to the gradual increase in presbyopia diopter. The optometry near prescription is specifically the superposition of presbyopia diopter and astigmatism diopter.

[0056] When the wearer is a presbyopic patient with myopia or hyperopia, the outer edge diopter of the second optical zone 14 can be set accordingly according to the myopia diopter or hyperopia diopter obtained by the wearer's actual optometry, and the diopter of the second optical zone 14 is gradually increased from the outside to the inside along the radial direction. The optometry near prescription is specifically the sum of the myopia diopter and the presbyopia diopter of the outer edge of the second optical zone 14; or, the sum of the hyperopia diopter and the presbyopia diopter.

[0057] When the wearer is a presbyopic patient who suffers from myopia and astigmatism at the same time or hyperopia and astigmatism at the same time, the myopia refraction or hyperopia refraction of the outer edge of the second optical zone 14 can be set accordingly according to the myopia refraction or hyperopia refraction and astigmatism refraction obtained by the wearer's actual optometry, and the refraction of the astigmatism can be made to gradually increase the positive spherical power of the second optical zone 14 from the outside to the inside in the radial direction, and the astigmatism refraction can be superimposed on the entire second optical zone 14. The optometry near prescription is specifically the sum of the myopia refraction and presbyopia refraction at the outer edge of the second optical zone 14 and the superposition of the astigmatism refraction; or, it is the sum of the hyperopia refraction and presbyopia refraction at the outer edge of the second optical zone 14 and the superposition of the astigmatism refraction.

[0058] Therefore, the scleral lens can be worn and used by presbyopic patients with different myopia, hyperopia or astigmatism degrees (including high myopia, hyperopia or astigmatism degrees).

[0059] During use of the scleral lens, when the user wears the scleral lens, the optical axis of the scleral lens is kept coaxial with the optical axis of the pupil E. Through the first optical zone 13 and the second optical zone 14 provided on the outer arc surface 12 of the scleral lens, in conjunction with the automatic expansion and contraction mechanism of the pupil E under light of different intensities, the user can see near through the first optical zone 13 and see far through the second optical zone 14, so as to meet the near vision and far vision needs of presbyopic patients suffering from myopia, hyperopia, astigmatism, or both myopia and astigmatism, or both hyperopia and astigmatism (wherein, near refers to a relatively small distance between the eye and the observed object (generally within one meter), and far refers to a relatively far distance between the eye and the observed object (generally beyond one meter)). The specific principles of near vision and far vision are as follows:

[0060] When near vision is required, the external light is brightened to make the pupil E contract to the point where the area within the vertical projection range of the first optical zone 13 on the pupil E is larger than the area within the vertical projection range of the second optical zone 14 on the pupil E. At this time, the brain receives relatively more clear near images projected onto the retina by the first optical zone 13, and can ignore the relatively blurred near images projected onto the retina by the second optical zone 14. The brain analyzes and forms a clear near image based on the clear near image.

[0061] When far vision is required, the external light is dimmed to enlarge the pupil E to the point where the area within the vertical projection range of the second optical zone 14 on the pupil E is larger than the area within the vertical projection range of the first optical zone 13 on the pupil E. At this time, the brain receives relatively more distant clear images projected onto the retina by the second optical zone 14, and can ignore the distant relatively blurred images projected onto the retina by the first optical zone 13, and can analyze and form distant images based on the distant clear images.

[0062] When it is necessary to observe objects at different distances, since the second optical zone 14 is a zoom zone with gradually increasing positive spherical power from outside to inside along the radial direction, images of the distant object with different clarity can be projected onto the retina at different diopters, and the brain can select the image with better clarity projected at the diopters suitable for the distance from multiple images, and form the final distant image, thereby achieving zoom vision. Furthermore, the diopters of the second optical zone 14 gradually increase positive spherical power from outside to inside along the radial direction, which can achieve continuous zoom, and can simultaneously project multiple images of the distant object with gradually changing clarity onto the retina when looking at the distance, avoiding the situation where the brain obtains a blurred image caused by image jump or light splitting under non-continuous step-by-step sharp changes.

[0063] Therefore, the variable focus scleral lens can be supported on the sclera A to avoid contact and damage to the cornea B. Combined with the automatic expansion and contraction mechanism of the pupil under different light, it can correct the focal position of the peripheral imaging of the retina when looking near and far, so as to meet the near and far vision needs of presbyopic patients with keratoconus, high refractive error, dry eye disease, corneal trauma, etc. when wearing scleral lenses. And it can also meet the needs of zoom far vision for people with myopia or hyperopia.

[0064] It should be noted that the user wearing the present scleral lens can brighten the external light by turning on the light, causing the pupil E to shrink for near vision, and when the external light is bright, the pupil E can be shrunk to the point where the first optical zone 13 completely covers the vertical projection range of the pupil E, so that the brain can only receive the near clear image projected onto the retina by the first optical zone 13, thereby improving the clarity of near vision. The wearer can also dim the external light by wearing sunglasses to cause the pupil E to dilate for far vision.

[0065] Specifically, the spherical power of the inner edge of the second optical zone 14 is smaller than the spherical power of the first optical zone 13 .

[0066] Furthermore, the vertical projection of the first optical zone 13 is circular, and the vertical projection of the second optical zone 14 is annular, so that the two optical zones can correspond to the vertically projected circular pupil E. The second optical zone 14 surrounds the outer periphery of the first optical zone 13 .

[0067] Specifically, the first optical zone 13 and the second optical zone 14 are both coaxial with the optical axis of the scleral lens so as to remain coaxial with the optical axis of the pupil E after being worn.

[0068] Specifically, the first optical zone 13 and the second optical zone 14 are both aspherical, so that the curvatures of different areas of the first optical zone 13 and the second optical zone 14 are different, thereby correcting the image projected onto the retina through the first optical zone 13 and the second optical zone 14, solving problems such as distorted vision, and making the scleral lens lighter, thinner and flatter, with excellent impact resistance.

[0069] Specifically, the vertical projection area of ​​the first optical zone 13 is not less than the minimum vertical projection area of ​​the pupil E, and is not greater than 2 / 3 of the maximum vertical projection area of ​​the pupil E.

[0070] The vertical projection area of ​​the pupil E in a normal state is within the range of the minimum vertical projection area and 2 / 3 of the maximum vertical projection area. Therefore, the pupil E under different light intensities can at least partially correspond to the vertical projection range of the first optical zone 13 (that is, the vertical projection radius of the pupil E is greater than, equal to or less than the vertical projection radius of the first optical zone 13) to meet the near vision requirements.

[0071] Preferably, the radius of the vertical projection of the first optical zone 13 is 2±1.5 mm, corresponding to the range from the minimum vertical projection radius to 2 / 3 of the maximum vertical projection radius when the pupil E of most people is in a contracted or expanded state.

[0072] Furthermore, the second optical zone 14 includes a fixed ring and a plurality of zoom rings which are continuously concentric from the outside to the inside in the radial direction. The fixed rings have the same diopter and are in the far distance direction of the optometry. The diopter of the plurality of zoom rings gradually increases the positive spherical power from the outside to the inside in the radial direction of the second optical zone 14, and the diopter of the innermost ring is smaller than the spherical power of the first optical zone 13, so that when observing a distant object at a certain distance, the zoom rings with different diopters can project images of the distant object with different clarity onto the retina.

[0073] Furthermore, the average change rate of the diopter of the second optical zone 14 from the outside to the inside in the radial direction is +0.25 to +1.50 D / mm, so as to provide progressive telephoto zoom. When observing a distant object at a certain distance, different images of the distant object with progressive clarity can be projected onto the retina, so that the brain can receive and analyze a clearer image.

[0074] Preferably, the radius of the vertical projection of the outermost ring of the second optical zone 14 is 8-10 mm, corresponding to the vertical projection radius of the cornea B or iris D of most people, so that the pupil E located at the center of the iris D in different contraction and expansion states can correspond to the range of the second optical zone 14 to meet the far vision requirements.

[0075] Furthermore, the inner arc surface 11 is continuously and concentrically provided with a base arc area 15 , a transition area 16 and a landing area 17 from the inside to the outside in the radial direction.

[0076] The base curve area 15 is spherical and its vertical projection is circular, and the base curve area 15 can be located above the cornea. The transition area 16 is aspherical and its vertical projection is annular, and the transition area 16 can be located above the corneoscleral limbus C. The base curve area 15 and the transition area 16 can form a tear chamber a with the cornea to provide a continuous eye water bath effect for dry eye patients, alleviate the discomfort of dry eye patients wearing scleral lenses, and be suitable for patients with refractive errors (myopia, hyperopia, astigmatism), dry eyes and presbyopia, further expanding the applicable population of the scleral lens.

[0077] The vertical projection of the landing area 17 is annular, and the landing area 17 fits the shape of the sclera, can be stably supported on the sclera, avoids contact and irritation to the cornea, and is suitable for people with corneal diseases.

[0078] Specifically, the base curve area 15, the transition area 16 and the landing area 17 are all coaxial with the optical axis of the scleral lens, so as to be coaxial with the optical axis of the pupil E after wearing.

[0079] Specifically, the height of the tear chamber a is 100-300 μm.

[0080] The diameter of the vertical projection of the base arc region 15 is 4-13.5 mm, and the sagittal height is 0.24-2.85 mm.

[0081] The diameter of the vertical projection of the transition zone 16 is 12-14 mm, and the sagittal height is 1.21-7.91 mm.

[0082] The diameter of the vertical projection of the landing area 17 is 14-17 mm, and the rise is 0.9-5.98 mm.

[0083] The above numerical settings of the inner arc surface 11 of the present scleral lens are suitable for use by most people.

[0084] Furthermore, the outer arc surface 12 is composed of a first optical zone 13, a second optical zone 14 and a peripheral arc zone concentrically nested on the outer periphery of the second optical zone 14, and the inner arc surface 11 is composed of a base arc zone 15, a transition zone 16 and a landing zone 17. The structure of the scleral lens is simple and easy to process.

[0085] In the present invention, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0086] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0087] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A variable focus scleral lens, characterized in that: It comprises an inner curved surface (11) and an outer curved surface (12); The inner arc surface (11) can be supported on the sclera (A); the center of the outer arc surface (12) is provided with a first optical zone (13) and a second optical zone (14) which are continuous and concentric from the inside to the outside in the radial direction; the first optical zone (13) and the second optical zone (14) can be located above the cornea (B); the vertical projection area of ​​the second optical zone (14) is larger than the vertical projection area of ​​the first optical zone (13); The refractive power of the outer edge of the second optical zone (14) is myopia refractive power, and the refractive power of the first optical zone (13) is the sum of myopia refractive power and presbyopia refractive power; or, the refractive power of the outer edge of the second optical zone (14) is hyperopia refractive power, and the refractive power of the first optical zone (13) is the sum of hyperopia refractive power and presbyopia refractive power; or, the refractive power of the second optical zone (14) is astigmatism refractive power, and the refractive power of the first optical zone (13) is the superposition of presbyopia refractive power and astigmatism refractive power; or, the refractive power of the outer edge of the second optical zone (14) is the superposition of myopia refractive power and astigmatism refractive power, The refractive power of the first optical zone (13) is the sum of the myopia refractive power and the presbyopia refractive power and the superposition of the astigmatism refractive power; or, the refractive power of the outer edge of the second optical zone (14) is the superposition of the hyperopia refractive power and the astigmatism refractive power, and the refractive power of the first optical zone (13) is the sum of the hyperopia refractive power and the presbyopia refractive power and the superposition of the astigmatism refractive power; the refractive power of the second optical zone (14) gradually increases the positive spherical power from the outside to the inside in the radial direction; when the refractive power of the second optical zone (14) is the astigmatism refractive power, the refractive power of the second optical zone (14) gradually increases the positive spherical power of the presbyopia refractive power from the outside to the inside in the radial direction.

2. The variable focus scleral lens according to claim 1, characterized in that: The vertical projection of the first optical zone (13) is a circle, and the vertical projection of the second optical zone (14) is annular; The second optical zone (14) surrounds the outer periphery of the first optical zone (13); The second optical zone (14) comprises a fixed ring and a plurality of zoom rings which are continuously concentric along the radial direction from the outside to the inside. The refractive power of the fixed rings is the same and is at the far distance of the optometry. The refractive power of the plurality of zoom rings gradually increases from the outside to the inside along the radial direction of the second optical zone (14). The spherical power of the innermost zoom ring is smaller than the spherical power of the first optical zone (13).

3. The variable focus scleral lens according to claim 2, characterized in that: The average change rate of the refractive power of the second optical zone (14) from the outside to the inside along the radial direction is +0.25 to +1.50 D / mm.

4. The variable focus scleral lens according to claim 2, characterized in that: The vertical projection area of ​​the first optical zone (13) is not less than the minimum vertical projection area of ​​the pupil (E) and is not greater than 2 / 3 of the maximum vertical projection area of ​​the pupil (E).

5. The variable focus scleral lens according to claim 4, characterized in that: The radius of the vertical projection of the first optical zone (13) is 2±1.5 mm.

6. The variable focus scleral lens according to claim 2, characterized in that: The radius of the vertical projection of the outermost ring of the second optical zone (14) is 8-10 mm.

7. The variable focus scleral lens according to claim 1, characterized in that: The inner arc surface (11) is continuously and concentrically arranged with a base arc area (15), a transition area (16) and a landing area (17) from the inside to the outside in the radial direction; The base curve area (15) is spherical and its vertical projection is circular, and the base curve area (15) can be located above the cornea; The transition zone (16) is aspherical and has a ring shape in vertical projection, and the transition zone (16) can be located above the corneoscleral limbus (C); The base curve area (15) and the transition area (16) can form a tear chamber (a) with the cornea; The vertical projection of the landing area (17) is annular, and the landing area (17) can be supported on the sclera; The height of the tear chamber (a) is 100-300 μm; The base arc region (15) has a vertical projection diameter of 4-13.5 mm and a sagittal height of 0.24-2.85 mm; The transition zone (16) has a vertical projection diameter of 12-14 mm and a sagittal height of 1.21-7.91 mm; The vertical projection diameter of the landing area (17) is 14-17 mm, and the sagittal height is 0.9-5.98 mm.

8. The variable focus scleral lens according to claim 7, characterized in that: The outer arc surface (12) is composed of a first optical zone (13), a second optical zone (14), and a peripheral arc zone concentrically nested on the outer periphery of the second optical zone (14); The inner arc surface (11) consists of the base arc area (15), the transition area (16) and the landing area (17).

9. A method for zooming using the variable focus scleral lens according to any one of claims 1 to 8, characterized in that: When the pupil (E) contracts to the point where the area of ​​the first optical zone (13) falling within the vertical projection range of the pupil (E) is larger than the area of ​​the second optical zone (13) falling within the vertical projection range of the pupil (E), a clear image at a near distance can be acquired; When the pupil (E) is enlarged to the point where the area of ​​the second optical zone (13) falling within the vertical projection range of the pupil (E) is larger than the area of ​​the first optical zone (13) falling within the vertical projection range of the pupil (E), a clear image at a distance can be acquired.

Images