CN114911073A - Stepless out-of-focus lens and frame glasses - Google Patents
Stepless out-of-focus lens and frame glasses Download PDFInfo
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- CN114911073A CN114911073A CN202110185259.8A CN202110185259A CN114911073A CN 114911073 A CN114911073 A CN 114911073A CN 202110185259 A CN202110185259 A CN 202110185259A CN 114911073 A CN114911073 A CN 114911073A
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- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/06—Lenses; Lens systems ; Methods of designing lenses bifocal; multifocal ; progressive
- G02C7/061—Spectacle lenses with progressively varying focal power
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- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/024—Methods of designing ophthalmic lenses
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- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/06—Lenses; Lens systems ; Methods of designing lenses bifocal; multifocal ; progressive
- G02C7/061—Spectacle lenses with progressively varying focal power
- G02C7/063—Shape of the progressive surface
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Abstract
The invention provides a stepless out-of-focus lens for controlling the development of myopia by using a myopic peripheral out-of-focus technology, which improves the comfort of wearing while realizing the control of the development of myopia. Specifically, the stepless defocusing lens comprises an optical area, wherein the optical area is provided with an anterior surface and a posterior surface, at least one surface of the anterior surface and the posterior surface is an aspheric surface, the whole optical area is an aspheric surface represented by the same expression, the diopter is continuously changed in the radial direction, and the diopter gradually increases along with the increase of the diameter.
Description
Technical Field
The invention relates to a stepless out-of-focus lens and frame glasses for controlling the development of myopia by using a myopic peripheral out-of-focus technology.
Background
Myopia is one of the refractive errors. As shown in fig. 1, when the eye is in a relaxed accommodation state, parallel rays enter the eye and pass through the cornea 1 and the crystalline lens 2 to be focused in front of the retina 3, namely, the image point 4 falls in front of the retina 3, so that a clear image cannot be formed on the retina, which is called a myopic eye. Myopia severely affects the vision of the human eye.
The main reason for the increase of the myopic eye degree is the lengthening of the axial length of the eye, which increases the degree by 3.00D every 1 mm. Recent medical studies have confirmed that the elongation of the eyeball depends on peripheral retinal defocus, and according to the dioptric concept, a person with a focus in front of the retina is called myopic defocus, and a person with a focus behind the retina is called hyperopic defocus (refer to fig. 2, reference numeral 3 denotes the retina, 103 denotes the spot shape of myopic defocus, and 203 denotes the spot shape of hyperopic defocus). Many zoological and anthropic studies have demonstrated that the retina can recognize defocused signals and signal the sclera to "grow" or "stop growing" based on the defocused information, thereby controlling the rate of axial growth. The central part of the retina of the myopic eye is myopic defocus, the periphery of the retina is hyperopic defocus, and the hyperopic defocus at the periphery of the retina is a main reason for promoting the increasing of the myopic eye degree.
The eyeball has the characteristic of inducing the development of the eyeball by depending on the imaging of the periphery of the retina, particularly the myopia of teenagers below 18 years old, if the imaging of the periphery of the retina is hyperopic defocusing, the retina tends to grow to an image point, the length of the eyeball is prolonged, and if the imaging of the periphery of the retina is myopic defocusing, the eyeball is stopped being prolonged. If the peripheral hyperopic defocus of the retina is corrected or the peripheral myopic defocus of the retina is artificially formed by a modern medical method, the continuous increase of the myopic degree can be prevented, the reason causing the peripheral defocus of the retina can be found out, and the occurrence and the progress of the myopic eye can be effectively prevented.
The concept of peripheral defocus is organized and summarized in the actual clinical field of visual optics, and doctors initially found that the axial length of the eye and the myopia growth rate of part of orthokeratology lens wearers are delayed, and further the effect of peripheral defocus is found, so that the theory of peripheral defocus for controlling myopia is formed. In addition to orthokeratology, frame glasses and optically defocused soft contact lenses using a segmented structure have been developed in the later stage.
The orthokeratology lens is a rigid air-permeable contact lens with an inverse geometric design, and the peripheral defocusing control mechanism is that the activity of corneal surface cells is utilized, and the front surface shape of the cornea is shaped into the shape of the inner surface of an optical area of the orthokeratology lens by wearing the lens at night, so that the myopic peripheral defocusing is formed. At present, the orthokeratology lens is widely applied to myopia prevention and control, is a reversible and non-operative physical correction method, has safety and effectiveness widely verified clinically, and is the most effective mode in myopia control.
Although the orthokeratology lens has great advantages in myopia control, the orthokeratology lens also has disadvantages, for example, the orthokeratology lens is only suitable for patients with diopter lower than 600 degrees, needs to go to a professional fitting and matching mechanism for fitting, has high requirements on compliance of patients and sanitation, has high price and has certain requirements on economic strength.
In the prior art, an optical defocusing soft contact lens is a peripheral defocusing control type corneal contact lens, the surface structure of the lens is divided into a plurality of layers, the layers are respectively designed into different radians (curvature radiuses), and two radians alternately realize myopic peripheral defocusing of diopters. Firstly, because the lens only has two radians, the optical imaging process is similar to that of a partitioned multi-focus lens, and all focuses interfere with each other to form a halo phenomenon; secondly, because the curvature radius of each arc section is different, a large amount of stray light is caused by the connection of the rings, and therefore the biggest problem of the lens is that the imaging is interfered by the multilayer structure of the optical area, and the visual quality is poor.
In the prior art, frame glasses designed based on a defocusing theory all adopt a partition structure, the center is designed into a zero-spherical-aberration optical area for accurate imaging, and the edge is designed into a peripheral defocusing control area or an astigmatic area with diopter higher than that of the central area. Prior art spectacle lenses for frames are generally divided into three structural designs: progressive channel/shell (fig. 3), toroidal multifocal (fig. 6), honeycomb (fig. 7).
A typical design of a progressive channel/shell lens is shown in fig. 3, wherein the lens is divided into a plurality of zones, and a section of spherical or aspherical surface is used in the central zone, so that the central diopter is relatively flat, and better central vision is achieved; after about phi 10mm, another segment of spherical or aspherical surface is used to achieve near vision defocus in diopter with a radius of curvature different from the center or an equivalent radius of curvature. The radial diopter and thickness distribution are respectively shown in fig. 4 and 5, and the thickness distribution has abrupt change as can be seen from fig. 5. In addition, a more specific design can be seen in patent US7025460B 2.
The myopia control principle and the starting point of the lens are similar to those of the invention, but the lens has a multi-section design with different curvature radiuses, so that the radial thickness and diopter span are caused, the image is discontinuous, the image surface jump is caused, special wearing tutoring needs to be carried out on a wearer, and a certain adaptation period is needed. In addition, the design only has a small part of the central area with the vision correction function and has the imaging function; the method has a series of problems of image deformation, dispersion and the like due to the fact that a transition area and a visual blind area are large, peripheral astigmatic areas and visual blind areas cannot be imaged; the range of available optical areas is small, and the actual visual field range is small; due to jump and distortion of imaging, the glasses are uncomfortable after being worn, have strong dizziness feeling and have extremely long adaptation period.
The lens with annular multi-focus design is shown in fig. 6, the lens is composed of circular rings with different curvature radiuses, the optical power generated by the central ring is used for correcting myopia, the design of the peripheral rings generates defocusing, and the design can also generate a series of visual interference problems such as image jump and the like due to the excessive arrangement between the circular rings with different curvature when being worn.
The lens with a honeycomb structure design is shown in fig. 7, and small lenses are made at the visual center, so that the effect of myopic defocusing of the retina is achieved through the small lenses. The lens with the design has defocused image interference while focusing, is poor in visual experience, can generate large aberration for non-normal incident light, seriously influences the field range of wearing, and is poor in wearing experience.
Disclosure of Invention
In view of the above, the present invention provides a stepless defocusing lens for controlling the development of myopia by using a myopic peripheral defocusing technology, wherein the radial refractive power of the stepless defocusing lens continuously changes, so that the control of the development of myopia is realized, image jump is avoided, and the wearing comfort and the imaging definition and reality are improved.
In order to achieve the purpose, the invention adopts the following technical scheme.
A stepless defocus lens comprising an optical zone having an anterior surface and a posterior surface, at least one of the anterior surface and the posterior surface being aspheric, the aspheric surface having the expression:
the aspheric surface is schematically shown in fig. 8, where O is the central point (0,0) of the lens, (x, y) is the point coordinate of the aspheric surface at the x, y plane position, and z (x, y) is the longitudinal (height) coordinate corresponding to the (x, y) point; c is the central curvature of the aspheric surface and is the reciprocal of the curvature radius; q is an aspherical coefficient, A 2i Is the high order term coefficient of the aspheric surface; wherein i is an integer; n and m are respectively the minimum value and the maximum value of i,
the aspheric surface of the front surface or the back surface of the whole optical area is an aspheric surface represented by the same expression, so that diopter continuously changes in the radial direction, and gradually increases with the increase of the diameter.
With the above structure, in the stepless defocusing lens (hereinafter also referred to as simply as a stepless defocusing lens), since the aspheric surface of the front surface or the back surface of the whole optical area is the aspheric surface represented by the same expression (that is, the front surface and/or the back surface forming the aspheric surface is the aspheric surface represented by the same expression in the whole optical area), diopter is continuously changed in the radial direction, and diopter gradually increases with the increase of the diameter, therefore, the stepless defocusing lens can realize smooth myopic peripheral defocusing with controllable defocusing degree in the whole optical area, can inhibit or eliminate the bad optical interference phenomena such as lens imaging jump, distortion and the like, can avoid or alleviate the uncomfortable feelings such as wearing vertigo, and can make the wearer comfortably see objects without the need or shorten the adaptation period.
Above-mentioned stepless out of focus lens can realize the controllable near-sighted type peripheral out of focus of smooth out of focus degree in full optical zone, and diopter distribution state is the trend of raising upwards in radial, promptly along with the constantly increasing of diameter, diopter increases gradually, changes to the nature of focusing lens gradually by diverging lens, makes the people eye wear after wearing, can make the center fall on the retina and the edge falls in the place ahead of retina, forms the out of focus state of a myopia change, when correcting vision, reaches the purpose that delays near-sighted development.
The stepless defocusing lens is a stepless defocusing lens which controls the development of myopia by utilizing a myopic peripheral defocusing technology, the material is typically made of glass or resin materials, the refractive index of the material can be in the range of 1.40-1.76, and the refractive index can be 1.55-1.67.
According to the invention, preferably, the radial diopter of the stepless defocusing lens raises on the central part more flatly than that on the periphery, so that the near-vision type peripheral defocusing can be realized, and meanwhile, the excellent central vision quality is ensured.
Preferably, in the above-mentioned stepless defocused lens, the slope K (x, y) of the tangent line of the aspheric surface in the radial direction of the (x, y) point position continuously satisfies the following expression:
wherein, K (x, y) is the slope of the tangent line of the aspheric surface in the radial direction of the position of the lens (x, y), c is the central curvature of the aspheric surface and is the reciprocal of the curvature radius, and (x, y) is the point coordinate of the aspheric surface on the x, y plane; q is an aspherical coefficient, A 2i Is the high order term coefficient of the aspheric surface; wherein i is an integer; n and m are respectively the minimum value and the maximum value of i.
With the above configuration, the wearing comfort can be further improved.
In the present invention, the diopter of the said stepless defocusing lens can be in the range of 0 to-25.0D.
Preferably, in the stepless defocusing lens, in the optical area, the difference between the radial diopter and the central diopter at the position with the diameter of 25mm is 0.10D-3.03D, and the difference between the radial diopter and the central diopter at the position with the diameter of 50mm is 0.49D-11.16D; the variation range of the unit diameter refractive power at the position with the diameter of 25mm is 0.0040-0.1212D/mm; the variation range of the unit diameter refractive power at the position of 50mm of the diameter is 0.0098-0.2232D/mm.
Preferably, in the above-mentioned stepless out-of-focus lens, the thickness of the lens changes continuously and smoothly from the center to the edge.
In this way, the thickness of the stepless defocused lens changes continuously and smoothly from the center to the edge, so that the generation of image jump can be further avoided or inhibited.
In addition, to achieve the above object, the present invention provides a stepless defocusing lens, comprising an optical zone having an anterior surface and a posterior surface, wherein at least one of the anterior surface and the posterior surface is a sphero-cylindrical combined lens combined with an aspheric design, and the formula of the stepless defocusing lens is as follows:
wherein c is x Is the central curvature of the aspherical surface in the x direction, i.e. the sphere lens direction, c y The central curvature of the aspheric surface in the y direction, i.e. the joint direction of the spherical column, (x, y) is the point coordinate of the aspheric surface on the x, y plane position, z (x, y) is the longitudinal (height) coordinate corresponding to the (x, y) point, Q x Is the aspheric surface coefficient of the aspheric surface in the x direction, Q y Is the aspheric coefficient of the aspheric surface in the y direction, A x2i The high-order aspheric surface coefficient of the aspheric surface in the x direction; a. the y2i Is a high-order aspheric surface coefficient of the aspheric surface in the y direction, wherein i is an integer; n and m are respectively the minimum value and the maximum value of i,
the aspheric surface of the front surface or the back surface of the whole optical area is an aspheric surface represented by the same expression, so that diopter continuously changes in the radial direction, and gradually increases with the increase of the diameter.
With the above structure, in the stepless defocusing lens (hereinafter also referred to as simply as a stepless defocusing lens), because the aspheric surface of the front surface or the back surface of the whole optical area is the aspheric surface represented by the same expression (that is, the front surface and/or the back surface forming the aspheric surface is the aspheric surface represented by the same expression in the whole optical area), diopter is continuously changed in the radial direction, and diopter is gradually increased along with the increase of the diameter, so that the stepless defocusing lens has a continuous and uniform surface shape in the whole optical area, has no break point, can realize smooth myopic peripheral defocusing with controllable defocusing degree, can inhibit or eliminate the bad optical interference phenomena such as lens imaging jumping, distortion and distortion, and avoid or alleviate the uncomfortable feeling such as wearing vertigo, so that a wearer can comfortably see objects, and does not need or shorten the adaptation period.
Above-mentioned stepless out of focus lens can realize the controllable near-sighted type peripheral out of focus of smooth out of focus degree in full optical zone, and diopter distribution state is the trend of raising upwards in radial, promptly along with the constantly increasing of diameter, diopter increases gradually, changes to the nature of focusing lens gradually by diverging lens, makes the people eye wear after wearing, can make the center fall on the retina and the edge falls in the place ahead of retina, forms the out of focus state of a myopia change, when correcting vision, reaches the purpose that delays near-sighted development.
The stepless out-of-focus lens is a stepless out-of-focus lens which controls the development of myopia by utilizing a near-sighted peripheral out-of-focus technology, the material is typically made of glass or resin material, the refractive index of the material can be in the range of 1.40-1.76, and the refractive index can be 1.55-1.67.
Preferably, the radial diopter of the stepless out-of-focus lens raises on the central part with a flatter amplitude than that of the periphery, so that the myopic peripheral out-of-focus lens can ensure excellent central vision quality.
In the present invention, preferably, in the above-mentioned stepless defocused lens, a slope K (x, y) of a tangent line of the aspheric surface in a radial direction of a position of the lens (x, y) is continuous and satisfies the following expression:
wherein K (x, y) is the slope of the tangent of the aspheric surface in the radial direction of the position of the lens (x, y) point, c x The central curvature of the aspheric surface in the x direction, i.e. the direction of the spherical lens; c. C y Is the central curvature of the aspheric surface in the y direction, i.e. the combined direction of the cylinders, (x, y) is the point coordinate of the aspheric surface in the x, y plane position, Q x Is the aspheric surface coefficient of the aspheric surface in the x direction, Q y Is the aspheric coefficient of the aspheric surface in the y direction, A x2i The high-order aspheric surface coefficient of the aspheric surface in the x direction; a. the y2i Is a high-order aspheric surface coefficient of the aspheric surface in the y direction, wherein i is an integer; n and m are respectively the minimum value and the maximum value of i.
With the above configuration, the wearing comfort can be further improved.
In the above-mentioned stepless defocus lens, diopter can be in the range of 0 to-25.0D.
In the present invention, preferably, in the stepless defocusing lens, in the optical area, the difference between the radial diopter and the central diopter at the position with the diameter of 25mm is 0.10D to 3.03D, the difference between the radial diopter and the central diopter at the position with the diameter of 50mm is 0.49D to 11.16D, and the variation range of the unit diameter refractive power at the position with the diameter of 25mm is 0.0040 to 0.1212D/mm; the variation range of the unit diameter refractive power at the position of 50mm of the diameter is 0.0098-0.2232D/mm.
Preferably, in the above-mentioned stepless out-of-focus lens, the thickness of the lens changes continuously and smoothly from the center to the edge.
Thus, the thickness of the stepless defocused lens continuously and smoothly changes from the center to the edge, and the generation of image jump can be further avoided.
Description of the terms
Stepless out-of-focus lens: lenses that achieve continuous radial power variation in the anterior and posterior surfaces of the optic zone of the lens, respectively, characterized by the same expression only.
Optical zone: the optical design features are located in the center of the lens to enable adjustment of the main functional portion of the lens' power.
Drawings
FIG. 1 is a schematic view of retinal imaging of a myopic eye;
fig. 2 is a schematic diagram for explaining a peripheral defocus state;
FIG. 3 is a schematic representation of a progressive channel/shell type spectacle lens of the prior art;
FIG. 4 is a graph of the radial power distribution for a prior art progressive channel frame ophthalmic lens;
FIG. 5 is an explanatory diagram showing the variation in thickness at the radial position of a progressive channel type frame spectacle lens of the prior art;
FIG. 6 is a schematic diagram of a prior art annular multifocal frame ophthalmic lens;
FIG. 7 is a schematic view of a prior art honeycomb frame ophthalmic lens;
FIG. 8 is a schematic representation of an aspheric surface used in the design of a stepless defocus lens of the present invention;
FIG. 9 is a machining drawing of a product of an embodiment of the present invention, in which the surface shape is continuous without a break point;
FIG. 10 is an optical detection map of the diopter distribution of a product of an embodiment of the present invention, with a rotationally symmetric diopter, uniform change and no nodal points;
figure 11 is a plot of diopter versus clear diameter (diameter) for a product of an embodiment of the present invention;
FIG. 12 is a graph of thickness versus diameter for a product according to an embodiment of the invention;
fig. 13 is a diagram (photograph) showing the effect of actual wearing of a product according to an embodiment of the present invention and a conventional zoom lens in the related art.
Detailed Description
The following describes in detail embodiments of the present invention.
[ first embodiment: spherical lens
A first embodiment relates to a stepless defocus lens comprising an optical zone having an anterior surface and a posterior surface, at least one of the anterior surface and the posterior surface being an aspheric surface expressed by:
]the aspheric surface is schematically shown in fig. 8, where O is the central point (0,0) of the lens, (x, y) is the point coordinate of the aspheric surface at the x, y plane position, and z (x, y) is the longitudinal (height) coordinate corresponding to the (x, y) point; c is the central curvature of the aspheric surface, which is the reciprocal of the curvature radius, and (x, y) is the point coordinate of the aspheric surface position; q is an aspherical coefficient, A 2i A high order term coefficient for the aspheric surface; wherein i is an integer; n and m are respectively the minimum value and the maximum value of i,
the aspheric surface of the front surface or the back surface of the whole optical area is an aspheric surface represented by the same expression, so that diopter continuously changes in the radial direction, and gradually increases with the increase of the diameter.
With the above structure, in the stepless defocusing lens (hereinafter also referred to as a stepless defocusing lens for short), since the aspheric surface of the front surface or the rear surface of the whole optical area is an aspheric surface represented by the same expression (that is, the front surface and/or the rear surface forming the aspheric surface is an aspheric surface represented by the same expression in the whole optical area), diopter changes continuously in the radial direction, and diopter gradually increases with the increase of the diameter, so that the stepless defocusing lens can realize smooth myopic peripheral defocusing with controllable defocusing degree in the whole optical area, can suppress or eliminate the undesirable optical interference phenomena such as lens imaging jump, distortion and the like, avoid or alleviate the uncomfortable feelings such as wearing vertigo and the like, and enable a wearer to see comfortably without the need or shorten the adaptation period.
Above-mentioned stepless out of focus lens can realize the controllable near-sighted type peripheral out of focus of smooth out of focus degree in full optical zone, and diopter distribution state is radially in the tendency of raising up, along with the constantly increasing of diameter promptly, diopter increases gradually, changes to the focusing nature lens by diverging lens gradually, makes people's eye wear after wearing, can make the center fall on the retina and the edge falls in the place ahead of retina, forms the out of focus state of a myopia change, when correcting eyesight, reaches the purpose that delays near-sighted development.
The stepless out-of-focus lens is a stepless out-of-focus lens which controls the development of myopia by utilizing a near-sighted peripheral out-of-focus technology, the material is typically made of glass or resin material, the refractive index of the material can be in the range of 1.40-1.76, and the refractive index can be 1.55-1.67.
According to the invention, preferably, the radial diopter of the stepless defocusing lens raises on the central part more flatly than that on the periphery, so that the near-vision type peripheral defocusing can be realized, and meanwhile, the excellent central vision quality is ensured.
Preferably, in the above-mentioned stepless defocused lens, the slope K (x, y) of the tangent line of the aspheric surface in the radial direction of the (x, y) point position is continuously free of singularities and satisfies the following expression:
the aspheric surface is a lens (x, y) with a certain curvature radius, wherein K (x, y) is the slope of a tangent of the aspheric surface in the radial direction of the position of the lens (x, y), c is the central curvature of the aspheric surface and is the reciprocal of the curvature radius, and (x, y) is the point coordinate of the aspheric surface on the position of an x plane and a y plane; q is an aspherical coefficient, A 2i Is the high order term coefficient of the aspheric surface; wherein i is an integer; n and m are respectively the minimum value and the maximum value of i.
With the above configuration, the wearing comfort can be further improved.
In the present invention, the diopter of the said stepless out-of-focus lens can be in the range of 0 to-25.0D.
In the present invention, preferably, in the stepless defocusing lens, in the optical area, the difference between the radial diopter and the central diopter at the position with the diameter of 25mm is 0.10D-3.03D, the difference between the radial diopter and the central diopter at the position with the diameter of 50mm is 0.49D-11.16D, and the variation range of the unit diameter refractive power at the position with the diameter of 25mm is 0.0040-0.1212D/mm; the variation range of the unit diameter refractive power at the position of 50mm of the diameter is 0.0098-0.2232D/mm.
Preferably, in the above-mentioned stepless out-of-focus lens, the thickness of the lens changes continuously and smoothly from the center to the edge.
In this way, the thickness of the stepless defocused lens changes continuously and smoothly from the center to the edge, so that the generation of image jump can be further avoided or inhibited.
Some examples of spherical lenses suitable for use with the present invention are shown in table 1.
Table 1 spherical lens design example: (front surface spherical surface, rear surface aspherical surface)
Remarking: n represents the refractive index of the lens material; ra: represents the front surface radius of curvature of the lens; and Rp: represents the radius of curvature of the posterior surface of the lens; CT: the center thickness of the lens is shown, and Q, A4, a6, and a8 are aspheric coefficients and high-order aspheric coefficients, respectively. Delta D 25 Representing the difference, Δ D, between the radial diopter and the central diopter at a lens diameter of 25mm 50 Representing the difference, Δ K, between the radial diopter and the central diopter at a lens diameter of 50mm 25 The change of the refractive power per unit diameter at a diameter of 25mm is represented by Δ D 25 /25，ΔK 50 Represents the change of unit diameter refractive power at 50mm diameter, and is calculated by Delta D 50 /50。ΔD 25 ：0.10～3.03D，ΔD 50 ：0.49～11.16D，ΔK 25 ：0.0040～0.1212D/mm；ΔK 50 ：0.0098～0.2232D/mm。
The aspheric surface of the above embodiment is on the back surface of the lens, and the practical implementation is easy to think, and the aspheric surface can be on the front surface, or on both the front and back surfaces.
[ second embodiment: combined ball and column lens
A stepless out-of-focus lens for controlling the development of myopia by utilizing a myopia-curing peripheral out-of-focus technology is generally made of glass or resin materials, the refractive index of the materials is generally 1.40-1.76, the commonly used refractive index is 1.55-1.67, the optical area of the lens comprises a front surface and a rear surface, at least one surface of the front surface and the rear surface is a sphero-cylindrical combined lens combined with an aspheric surface design, astigmatism is corrected while myopia is corrected, and the expression of the sphero-cylindrical combined aspheric surface is as follows:
wherein c is x Is the central curvature of the aspherical surface in the x direction (sphere lens direction), c y Is the center curvature of the aspheric surface in the y direction (cylinder combination direction), (x, y) is the point coordinate of the aspheric surface in the x, y plane position, Q x Is the aspherical surface coefficient of the aspherical surface in the x direction (sphere lens direction), Q y Is the aspheric coefficient of the aspheric surface in the y direction (cylinder combination direction), A x2i The high-order aspheric surface coefficient of the aspheric surface in the x direction (the spherical mirror direction); a. the y2i Is a high-order aspheric surface coefficient of the aspheric surface in the y direction (the combined sphere and cylinder direction), wherein i is an integer; n and m are respectively the minimum value and the maximum value of i.
The slope K (x, y) of the tangent of the aspheric surface in the radial direction of the position of the (x, y) point of the lens is continuously free of singularities and conforms to the following expression:
wherein K (x, y) is the slope of the tangent of the aspheric surface in the radial direction of the position of the lens (x, y) point, c x Is the central curvature of the aspheric surface in the x direction (sphere lens direction); c. C y Is the center curvature of the aspheric surface in the y direction (cylinder combination direction), (x, y) is the point coordinate of the aspheric surface in the x, y plane position, Q x Is the aspherical surface coefficient of the aspherical surface in the x direction (sphere lens direction), Q y Is the aspheric coefficient of the aspheric surface in the y direction (joint direction of the spherical column), A x2i The high-order aspheric surface coefficient of the aspheric surface in the x direction (the direction of a spherical lens); a. the y2i Is a high-order aspheric surface coefficient of the aspheric surface in the y direction (the combined sphere and cylinder direction), wherein i is an integer; n and m are respectively the minimum value and the maximum value of i.
The aspheric surface of the front surface or the back surface of the whole optical area of the stepless defocusing lens adopts a smooth uninterrupted aspheric surface represented by the same expression; the surface shape is continuous and uniform, no breakpoint is formed, and smooth peripheral defocusing is realized. The diopter of the lens can be continuously changed in the radial direction, the image jump is avoided, a wearer can comfortably see objects, and the adaptation period is not needed.
Stepless out of focus lens can realize the controllable near-sighted type peripheral out of focus of smooth out of focus degree in full optical zone, and diopter distribution state is the trend of raising up in the radial, and along with the constantly increasing of diameter, diopter increases gradually, changes to the focusing nature lens by diverging lens gradually, makes people's eye wear after, can make the center fall on the retina and the edge falls in the place ahead of retina, forms the out of focus state of a myopia change, when correcting eyesight, reaches the purpose that delays myopia development.
The range of diopter of the stepless out-of-focus lens raised on the central part is flatter than that raised on the periphery, and the excellent central vision quality is ensured while the near-vision type peripheral out-of-focus lens is realized.
The thickness of the stepless defocusing lens continuously and smoothly changes from the center to the edge, so that the generation of image jump is avoided.
Some examples of sphero-cylindrical combined lenses suitable for use with the invention are shown in table 2.
The aspheric surface of the above embodiment is on the back surface of the lens, and the practical implementation is easy to think, and the aspheric surface can be on the front surface, or on both the front and back surfaces.
In addition, the invention also provides frame glasses with the stepless defocusing lens.
[ SUMMARY OF THE EMBODIMENTS ] OF THE INVENTION
The aspheric surface of the front surface or the rear surface of the whole optical area of the stepless defocusing lens is represented by the same expression, is a smooth and uninterrupted aspheric surface, has a continuous and uniform surface shape, and has no break point (figure 9).
The stepless defocusing lens can realize continuous diopter change in the radial direction (figure 10), avoids image jump, enables a wearer to comfortably see objects, and does not need an adaptation period.
Stepless out of focus lens can realize the controllable near-sighted type peripheral out of focus of smooth out of focus degree in full optical zone, and diopter distribution state is the trend of raising upwards in the radial, and along with the constantly increasing of diameter, diopter increases gradually, changes to the focusing nature lens gradually by diverging lens, makes the people eye wear after wearing, can make the center fall on the retina and the edge falls in the place ahead of retina, forms the out of focus state of a myopia change, when correcting vision, reaches the purpose that delays myopia development.
The radial diopter of the said stepless out-of-focus lens is raised more evenly in the central part than in the periphery (fig. 11), and the diopter change degree in the central part is smaller than that in the periphery, or it can be said that the diopter change degree gradually increases (sharp, steep) from the central part to the periphery. Thus, excellent central vision quality can be guaranteed while realizing myopic peripheral defocus.
The thickness of the stepless out-of-focus lens changes continuously and smoothly from the center to the edge (fig. 12), and image jump can be avoided.
The common defocused mirror is easy to have uncomfortable symptoms such as dizziness and the like caused by visual interference such as image jump, astigmatism and the like when being worn. The design of the whole optical area of the stepless defocusing lens is expressed by adopting the same section of aspheric surface expression, diopter is continuously changed, smooth peripheral defocusing is realized, no image jump is caused, wearing is comfortable, and the adaptation period is not needed. The imaging is clear and real, no distortion (figure 13 (b)) and wide application range. Referring to fig. 13, as shown in (a) of the prior art, in a conventional defocusing lens, an object has distortion, and as shown in (b) of the prior art, in a stepless defocusing lens produced according to an embodiment of the present invention, the object does not deform naturally.
Claims (12)
1. A stepless defocus lens comprising an optical zone having an anterior surface and a posterior surface, wherein at least one of the anterior surface and the posterior surface is aspheric, the aspheric surface having the expression:
wherein c is the central curvature of the aspheric surface and is the reciprocal of the curvature radius, (x, y) is the coordinate of the point on the aspheric surface position, Q is the aspheric surface coefficient, A is the central curvature of the aspheric surface, and 2i is the coefficient of high-order term of the aspheric surface, wherein i is an integer, n and m are respectively the minimum value and the maximum value of i,
the aspheric surface of the front surface or the back surface of the whole optical area is an aspheric surface represented by the same expression, so that diopter continuously changes in the radial direction, and gradually increases with the increase of the diameter.
2. The stepless through-focus lens of claim 1, wherein the slope K (x, y) of the tangent line of the aspheric surface in the radial direction of the (x, y) point position continuously conforms to the following expression:
wherein, K (x, y) is the slope of the tangent of the aspheric surface in the radial direction of the position of the lens (x, y), c is the central curvature of the aspheric surface and is the reciprocal of the curvature radius, and (x, y) is the point coordinate of the aspheric surface position; q is an aspherical coefficient, A 2i Is the high order term coefficient of the aspheric surface; wherein i is an integer; n and m are respectively the minimum value and the maximum value of i.
3. The stepless through-focus lens of claim 1,
in the optical zone, a first optical zone is formed,
the diopter difference between the radial diopter at the position with the diameter of 25mm and the center is 0.10D-3.03D,
the difference value between the radial diopter and the central diopter at the position with the diameter of 50mm is 0.49D-11.16D.
4. The stepless through-focus lens of claim 1,
the variation range of the unit diameter refractive power at the position with the diameter of 25mm is 0.0040-0.1212D/mm;
the variation range of the unit diameter refractive power at the position of 50mm of the diameter is 0.0098-0.2232D/mm.
5. The afc lens of claim 1, wherein the thickness of the lens varies continuously from center to edge.
6. Framed spectacles comprising the stepless defocus lens as recited in any one of claims 1 to 5.
7. A stepless defocus lens comprising an optical zone having an anterior surface and a posterior surface,
at least one of the front surface and the back surface is designed by combining a sphero-cylindrical combined lens with an aspheric surface, and corrects astigmatism while correcting myopia, wherein the expression is as follows:
wherein c is x Is the central curvature of the aspherical surface in the x direction, i.e. the sphere lens direction, c y Is the center curvature of the aspheric surface in the y direction, i.e. the cylinder joint direction, (x, y) is the point coordinate of the aspheric surface position, Q x Is the aspheric surface coefficient of the aspheric surface in the x direction, Q y Is the aspheric coefficient of the aspheric surface in the y direction, A x2i The high-order aspheric surface coefficient of the aspheric surface in the x direction; a. the y2i Is a high-order aspheric surface coefficient of the aspheric surface in the y direction, wherein i is an integer; n and m are respectively the minimum value and the maximum value of i,
the aspheric surface of the front surface or the back surface of the whole optical area is an aspheric surface represented by the same expression, so that diopter continuously changes in the radial direction, and gradually increases with the increase of the diameter.
8. The lens of claim 7, wherein the slope K (x, y) of the tangent line of the aspheric surface in the radial direction of the lens (x, y) point position is continuously in accordance with the following expression:
wherein K (x, y) is the slope of the tangent of the aspheric surface in the radial direction of the position of the lens (x, y) point, c x The central curvature of the aspheric surface in the x direction, namely the spherical lens direction; c. C y Is the center curvature of the aspheric surface in the y direction, i.e. the cylinder joint direction, (x, y) is the point coordinate of the aspheric surface position, Q x Is the aspheric surface coefficient of the aspheric surface in the x direction, Q y Is the aspheric coefficient of the aspheric surface in the y direction, A x2i The high-order aspheric surface coefficient of the aspheric surface in the x direction; a. the y2i Is a high-order aspheric surface coefficient of the aspheric surface in the y direction, wherein i is an integer; n and m are respectively the minimum value and the maximum value of i.
9. The stepless through-focus lens of claim 7,
in the optical zone, the optical zone is provided with a plurality of optical zones,
the diopter difference between the radial diopter at the position with the diameter of 25mm and the center is 0.10D-3.03D,
the difference between the radial diopter and the central diopter at the position with the diameter of 50mm is 0.49D-11.16D.
10. The stepless out-of-focus lens of claim 7,
the variation range of the unit diameter refractive power at the position with the diameter of 25mm is 0.0040-0.1212D/mm;
the variation range of the unit diameter refractive power at the position of 50mm of the diameter is 0.0098-0.2232D/mm.
11. The afc lens of claim 7, wherein the thickness of the lens varies continuously and smoothly from the center to the edge.
12. Framed spectacles comprising a stepless through-focus lens according to any one of claims 7 to 11.
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| CN202110185259.8A CN114911073A (en) | 2021-02-10 | 2021-02-10 | Stepless out-of-focus lens and frame glasses |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115755431A (en) * | 2022-11-14 | 2023-03-07 | 江苏康耐特光学有限公司 | Myopia prevention and control spectacle lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115755431A (en) * | 2022-11-14 | 2023-03-07 | 江苏康耐特光学有限公司 | Myopia prevention and control spectacle lens |
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