CN215117038U - Stepless out-of-focus lens and frame glasses - Google Patents
Stepless out-of-focus lens and frame glasses Download PDFInfo
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- CN215117038U CN215117038U CN202120370322.0U CN202120370322U CN215117038U CN 215117038 U CN215117038 U CN 215117038U CN 202120370322 U CN202120370322 U CN 202120370322U CN 215117038 U CN215117038 U CN 215117038U
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Abstract
The utility model provides an utilize peripheral out of focus lens of near-sighted technological control near-sighted development of myopia changes, when realizing controlling the near-sighted development, improves the comfort of wearing. Particularly, the utility model discloses a stepless out of focus lens, including optics district, optics district has front surface and rear surface, the front surface with at least one side in the rear surface is the aspheric surface, and is whole optics district is the aspheric surface of same expression sign, makes diopter follow footpath continuous variation, along with the increase of diameter, diopter increase gradually.
Description
Technical Field
The utility model relates to a stepless out-of-focus lens and frame glasses utilizing the peripheral out-of-focus technology of myopia to control myopia development.
Background
Myopia is one of the refractive errors. As shown in figure 1, when the eye is in a relaxed state of accommodation, parallel rays of light enter the eye, pass through the cornea 1 and the crystalline lens 2 and are focused in front of the retina 3, i.e. the image point 4 falls in front of the retina 3, resulting in the inability to form a sharp image on the retina, known as 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 "growth" or "growth stop" to the sclera in response to 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 lenses and optically defocused soft contact lenses using zone structures were developed in the later stages.
The orthokeratology lens is a rigid air-permeable contact lens with an inverse geometric design, and the peripheral defocus control mechanism of the orthokeratology lens is that the activity of cells on the surface of a cornea is utilized, the front surface shape of the cornea is shaped into the shape of the inner surface of the optical area of the orthokeratology lens by wearing the lens at night, and further the myopic peripheral defocus is formed. At present, the application of the orthokeratology lens in preventing and controlling myopia is very wide, the orthokeratology lens is a reversible and non-operative physical correction method, the safety and the effectiveness of the orthokeratology lens are clinically and widely verified, and the orthokeratology lens is the most effective mode in controlling myopia.
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, the optical out-of-focus soft contact lens is a peripheral out-of-focus 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 the two radians alternately realize the myopic peripheral out-of-focus of diopter. The method for realizing the peripheral defocus control has two problems, firstly, because the lens only comprises two radians, the optical imaging process is similar to a partitioned multi-focus lens, and all focuses have mutual interference 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, in which 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 that this kind of lens adopted are similar with the utility model discloses, nevertheless because there is the different curvature radius design of multistage in the lens, arouse the leap of radial thickness and diopter, lead to the image discontinuity, cause image plane jump, need carry out special wearing tutor to the wearer to need certain adaptation period. In addition, the design has the vision correction function only in a small part of the central area, and has the imaging function; the method has a series of problems of image deformation, chromatic dispersion and the like due to the fact that a transition area and a visual blind area are large and cannot be imaged because peripheral astigmatic areas and visual blind areas are large; the range of available optical area 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 out-of-focus image interference while focusing, is poor in visual experience, can generate large aberration for non-normal incident light, seriously influences the field range of the wearer and is poor in wearing experience.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing an utilize peripheral out of focus technique control myopia development of myopia change stepless out of focus lens, the radial refractive power continuous variation of stepless out of focus lens avoids producing the image jump when realizing the development of control myopia, improves the comfort and the formation of image definition reality degree of wearing.
In order to achieve the above purpose, the utility model 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, which is the reciprocal of the curvature radius; q is an aspherical coefficient, A2iIs 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 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.
The utility model discloses it is preferred, the range that the radial diopter of stepless out of focus lens was raised upward in the central part is more flat on every side, so, can guarantee outstanding central vision quality when realizing the peripheral out of focus of myopia type.
The utility model discloses preferably, in above-mentioned stepless out of focus lens, the slope K (x, y) of the tangent line of aspheric surface in (x, y) point position radial direction accords with following expression in succession:
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 inverse of the curvature radiusThe number, (x, y) is the point coordinate of the aspheric surface on the x, y plane position; q is an aspherical coefficient, A2iIs 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.
The utility model discloses in, the diopter of above-mentioned stepless out of focus lens can be in 0 ~ 25.0D's scope.
The utility model discloses preferably, in above-mentioned stepless out of focus lens, in optics district, the radial diopter of diameter 25mm department is 0.10D ~ 3.03D with central diopter difference, and the radial diopter of diameter 50mm department is 0.49D ~ 11.16D with central diopter difference; 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.
The utility model discloses preferably, in above-mentioned stepless out of focus lens, the thickness of lens is from the continuous smooth change in center to 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, in order to reach above-mentioned purpose, the utility model also provides a stepless out of focus lens, it is including optics district, optics district has front surface and rear surface, the front surface with at least one side in the rear surface combines the lens to combine the aspheric surface design for the sphero-cylindrical, corrects astigmatism when correcting myopia, and its expression formula is:
wherein c isxIs the central curvature of the aspherical surface in the x direction, i.e. the sphere lens direction, cyThe central curvature of the aspheric surface in the y direction, i.e. the combined direction of the spherical cylinders, (x, y) is the point coordinate of the aspheric surface on the x and y plane positions, z (x, y) is the longitudinal (height) coordinate corresponding to the point (x, y), QxIs the aspheric surface coefficient of the aspheric surface in the x direction, QyIs the aspheric coefficient of the aspheric surface in the y direction, Ax2iThe high-order aspheric surface coefficient of the aspheric surface in the x direction; a. they2iIs 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 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.
The utility model discloses it is preferred, the range that the radial diopter of stepless out of focus lens was raised upward in the central part is more flat on every side, so, can guarantee outstanding central vision quality when realizing the peripheral out of focus of myopia nature.
The utility model discloses preferably, in above-mentioned stepless out of focus lens, the slope K (x, y) of the tangent line of aspheric surface at lens (x, y) point position radial direction just accords with following expression in succession:
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, cxIs the central curvature of the aspheric surface in the x direction, i.e. the sphere lens direction, cyIs 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, QxIs the aspheric surface coefficient of the aspheric surface in the x direction, QyIs the aspheric coefficient of the aspheric surface in the y direction, Ax2iThe high-order aspheric surface coefficient of the aspheric surface in the x direction; a. they2iIs 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.
The utility model discloses preferably, in above-mentioned stepless out of focus lens, in optics district, the radial diopter of diameter 25mm department is 0.10D ~ 3.03D with central diopter difference, and the radial diopter of diameter 50mm department is 0.49D ~ 11.16D with central diopter difference, and the variation range of unit diameter dioptric power of diameter 25mm department 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.
The utility model discloses preferably, in above-mentioned stepless out of focus lens, the thickness of lens is from the continuous smooth change in center to 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 view for explaining a peripheral defocus state;
FIG. 3 is a schematic representation of a progressive channel/shell frame ophthalmic 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 view of an aspheric surface for the design of a stepless defocused lens according to 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 and has no break point;
FIG. 10 is an optical detection graph of diopter distribution with a convoluted symmetry of diopter, uniform variation and no node for a product according to an embodiment of the present invention;
figure 11 is a graph of diopter versus clear diameter (diameter) for a product according to embodiments 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 an effect diagram (photo) of the practical wearing of the product of the embodiment of the present invention and the ordinary afocal glasses in the prior art.
Detailed Description
The following describes in detail embodiments of the present invention.
[ first embodiment: ball 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, A2iIs 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 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.
The utility model discloses it is preferred, the range that the radial diopter of stepless out of focus lens was raised upward in the central part is more flat on every side, so, can guarantee outstanding central vision quality when realizing the peripheral out of focus of myopia type.
The utility model discloses preferably, in above-mentioned stepless out of focus lens, the slope K (x, y) of the tangent line of aspheric surface in (x, y) point position radial direction does not have the singularity in succession and accords with 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, A2iIs 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.
The utility model discloses in, the diopter of above-mentioned stepless out of focus lens can be in 0 ~ 25.0D's scope.
The utility model discloses preferably, in above-mentioned stepless out of focus lens, in optics district, the radial diopter of diameter 25mm department is 0.10D ~ 3.03D with central diopter difference, and the radial diopter of 50mm department is 0.49D ~ 11.16D with the difference of central diopter, and the variation range of unit diameter refractive power of diameter 25mm department 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.
The utility model discloses preferably, in above-mentioned stepless out of focus lens, the thickness of lens is from the continuous smooth change in center to 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 suitable spherical lenses 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 radius of curvature of the anterior surface 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 D25Representing the difference, Δ D, between the radial diopter and the central diopter at a lens diameter of 25mm50Representing the difference, Δ K, between the radial diopter and the central diopter at a lens diameter of 50mm25The change of the refractive power per unit diameter at a diameter of 25mm is represented by Δ D25/25，ΔK50The change of the refractive power per unit diameter at a diameter of 50mm is represented by Δ D50/50。ΔD25：0.10～3.03D，ΔD50：0.49～11.16D，ΔK25：0.0040～0.1212D/mm；ΔK50： 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 isxIs the central curvature of the aspherical surface in the x direction (sphere lens direction), cyIs 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, QxIs the aspherical surface coefficient of the aspherical surface in the x direction (sphere lens direction), QyIs the aspheric coefficient of the aspheric surface in the y direction (cylinder combination direction), Ax2iThe high-order aspheric surface coefficient of the aspheric surface in the x direction (the spherical mirror direction); a. they2iIs 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, cxIs the central curvature of the aspheric surface in the x direction (sphere lens direction); c. CyIs the central curvature of the aspheric surface in the y direction (cylinder combination direction), and (x, y) isPoint coordinates, Q, of aspheric surface in x, y plane positionxIs the aspherical surface coefficient of the aspherical surface in the x direction (sphere lens direction), QyIs the aspheric coefficient of the aspheric surface in the y direction (cylinder combination direction), Ax2iThe high-order aspheric surface coefficient of the aspheric surface in the x direction (the spherical mirror direction); a. they2iIs 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 break point exists, and smooth peripheral defocusing is realized. The diopter of the lens can be changed continuously in the radial direction, the image jump is avoided, the wearer can see objects comfortably, 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 image jump is avoided.
Some examples of suitable sphero-cylindrical combined lenses 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.
Additionally, the utility model also provides a frame glasses of having above-mentioned stepless out of focus lens.
[ SUMMARY OF THE EMBODIMENTS ] OF THE INVENTION
The utility model discloses a front surface or the aspheric surface of rear surface in whole optics district of stepless out of focus lens adopt the same expression sign, level and smooth incessant aspheric surface, and the shape of face is continuous even, does not have the breakpoint (fig. 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 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 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 (figure 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 in the whole optics district of stepless out of focus lens adopt same section aspheric surface expression to express, diopter continuous variation realizes level and smooth peripheral out of focus, does not have the jump, wears comfortablely, need not adaptation phase. 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, the object of view of the ordinary afocal lens has distortion, and as shown in (b) of the prior art, the object of view of the stepless out-of-focus lens of the embodiment of the present invention is naturally not deformed.
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, and2iis 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 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 position; q is an aspherical coefficient, A2iHigher order terms of the aspherical surfaceCounting; 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, 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.
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 rear surface is designed by combining a spherical column joint lens with an aspheric surface, and the astigmatism is corrected while the myopia is corrected, wherein the expression is as follows:
wherein c isxIs the central curvature of the aspherical surface in the x direction, i.e. the sphere lens direction, cyIs the central curvature of the aspheric surface in the y direction, i.e. the direction of the cylinder combination(x, y) is the coordinates of the points on the aspheric surface position, QxIs the aspheric surface coefficient of the aspheric surface in the x direction, QyIs the aspheric coefficient of the aspheric surface in the y direction, Ax2iThe high-order aspheric surface coefficient of the aspheric surface in the x direction; a. they2iIs 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, cxIs the central curvature of the aspheric surface in the x direction, i.e. the sphere lens direction, cyIs 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, QxIs the aspheric surface coefficient of the aspheric surface in the x direction, QyIs the aspheric coefficient of the aspheric surface in the y direction, Ax2iThe high-order aspheric surface coefficient of the aspheric surface in the x direction; a. they2iIs 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 through-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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| WO2023120007A1 (en) * | 2021-12-21 | 2023-06-29 | ホヤ レンズ タイランド リミテッド | Eyeglass lens and method for designing eyeglass lens |
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