CN112684611B - Orthokeratology lens design method, manufacturing method and orthokeratology lens - Google Patents
Orthokeratology lens design method, manufacturing method and orthokeratology lens Download PDFInfo
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Abstract
本发明提供角膜塑形镜设计方法、制造方法，其中，根据眼内散光的参数确定角膜塑形镜基弧区的形状参数，使由所述基弧区塑形后的角膜具有规定散光，该规定散光可与眼内散光大小相等，方向相反，从而能够补偿或者抵消眼内散光，提高人眼视力和清晰度。
The present invention provides a design method and a manufacturing method for orthokeratology lenses, wherein the shape parameters of the base curve area of the orthokeratology lenses are determined according to the parameters of intraocular astigmatism, so that the cornea shaped by the base curve area has a specified astigmatism, and the specified astigmatism can be equal to the intraocular astigmatism in magnitude and opposite in direction, thereby compensating for or offsetting the intraocular astigmatism and improving the vision and clarity of the human eye.
Description
Technical Field
The invention relates to a cornea shaping lens and a design method and a manufacturing method thereof, in particular to a cornea shaping lens design method and a manufacturing method with a base arc area having an astigmatic shaping structure.
Background
The hard air permeable cornea contact lens for cornea shaping is a reversible and non-operative refraction correcting product, and is generally a reverse geometric design formed by several concentric circular arc areas together, and has a base arc shaping area, a reverse arc area, a positioning area and other areas.
The base curve of the cornea shaping lens is generally designed as a sphere with a set radius of curvature, primarily for correcting myopia. Patent document 1 discloses a cornea shaping lens having a base curve region with more than one radius of curvature, wherein an optical region of the cornea is shaped into several regions with different radii of curvature, so that the human eye has a plurality of focuses at the same time, and ametropia is corrected while presbyopia is corrected. Patent document 2 discloses a cornea shaping lens having an aspherical base curve zone for providing appropriate peripheral defocus or aberration. These designs all aim to shape the cornea into a 360 degree circumferentially rotationally symmetrical plane. Patent document 3 discloses a cornea shaping lens, wherein the inner surface of the cornea shaping lens is divided into a base arc zone, a reverse arc zone, a positioning arc zone and a peripheral arc zone from the center to the periphery, wherein the positioning arc zone is a multi-zone annular curved surface, and the positioning arc zone on the inner surface of the cornea shaping lens is designed into a multi-zone annular curved surface so as to improve the degree of anastomosis between the cornea shaping lens and the cornea, and achieve the effect of positioning and centering the lens.
Astigmatism is a low order aberration common to the human eye, and has a direct effect on vision, and astigmatism exceeding 0.75D can dramatically reduce the resolution of the human eye. The reason why the human eye scatters light is that the radius of curvature (refractive power) is different in different meridians, and the light passing through different meridians after the human eye cannot be focused (form a focus) in the eye at the same time, but two mutually perpendicular focal lines are formed in space, which can cause deformation of an object image and unclear vision. The cornea and the crystalline lens of a human eye are two large refractive elements as an optical system, and astigmatism of the human eye may be caused by any one of the refractive elements or several refractive elements have astigmatism. Astigmatism has an axial direction, generally referred to as the angle between the maximum/minimum optical power direction and the horizontal direction of the human eye. Astigmatism of the cornea and lens may be either co-directional or non-directional.
After wearing the cornea shaping lens with astigmatism, the central optical zone is shaped as a rotationally symmetrical surface, and if the cornea of the wearer has astigmatism, the corneal astigmatism is corrected by wearing the cornea shaping lens. However, if the wearer has intraocular astigmatism, the intraocular astigmatism cannot be corrected after wearing the cornea shaping lens, and the vision quality is still affected, and if the cornea astigmatism direction is originally complementary to the intraocular astigmatism direction, the total eye astigmatism is increased after wearing the cornea shaping lens, so that the vision quality of the wearer is poorer. The existing cornea shaping lens can not solve the problem of intraocular astigmatism.
Background art literature:
Patent document 1 CN108008544A
Patent document 2 CN10629977A
Patent document 3 CN202453593U
Disclosure of Invention
The invention aims to provide a cornea shaping lens with an astigmatism correcting function in a base arc area and a manufacturing method thereof, wherein the cornea shaping lens can shape a cornea optical area into a specified astigmatism form, compensate astigmatism in eyes and reduce/correct astigmatism of eyes.
In order to achieve the above object, the present invention provides a cornea shaping lens design method, the cornea shaping lens having an inner surface facing the cornea of a human eye when worn, the inner surface including a base arc region at the center, comprising the steps of obtaining parameters of intraocular astigmatism, and determining shape parameters of the base arc region according to the parameters of intraocular astigmatism, so that the cornea shaped by the base arc region has prescribed astigmatism, the prescribed astigmatism being capable of compensating for the intraocular astigmatism.
Unlike the prior art, the cornea which is the object of shaping is not eliminated as much as possible, but rather the cornea is provided with a certain astigmatism (namely a prescribed astigmatism) after shaping, and the effect of the intraocular astigmatism can be compensated and even eliminated by actively forming and controlling the astigmatism, so that the whole-eye astigmatism is in a controllable state, and the whole-eye astigmatism is reduced or corrected after shaping.
Preferably, the base arc area has a toroidal curved shape.
Preferably, the base arc region extends in a sine curve or a cosine curve in the circumferential direction.
In the present invention, preferably, in the intraocular astigmatism acquisition step, the parameter of intraocular astigmatism is determined based on a parameter of corneal anterior surface astigmatism and a parameter of whole-eye astigmatism.
Preferably, the parameter of the astigmatism of the anterior surface of the cornea is a parameter within 6mm, within 5mm or within 3mm of the diameter of the cornea.
In addition, in order to achieve the purpose, the invention also provides a cornea shaping lens design method, which comprises the steps of obtaining the size and the direction of the astigmatism of the front surface of the cornea and the astigmatism of the whole eye, determining the size and the direction of the astigmatism of the eye according to the size and the direction of the astigmatism of the front surface of the cornea, determining the curvature radius parameter of the annular surface of the base arc according to the size of the astigmatism of the eye, determining the direction parameter of the annular surface of the base arc according to the direction of the astigmatism of the eye, so that the cornea shaped by the base arc has a specified astigmatism which can compensate the astigmatism of the eye, obtaining the shape of the cornea area where the adaptive arc is located, and determining the angle between the curvature parameter of the adaptive arc area and the direction of the adaptive arc area according to the shape parameter of the adaptive arc area.
Preferably, the prescribed astigmatism is substantially the same size and opposite direction as the intraocular astigmatism.
Preferably, the curvature radius parameter comprises a flat K-direction curvature radius and a steep K-direction curvature radius,
The invention preferably uses a flat K direction or a steep K direction as the direction parameter.
In addition, in order to achieve the above object, the present invention also provides a method for manufacturing a cornea shaping lens having an inner surface facing a cornea of a human eye when worn, the inner surface including a base curve region at a center, comprising the steps of obtaining parameters of intraocular astigmatism, and determining shape parameters of the base curve region based on the parameters of intraocular astigmatism, so that the cornea shaped by the base curve region has prescribed astigmatism which can compensate for the intraocular astigmatism.
In the method, the base arc area is preferably in a toroidal curved surface shape, the base arc area extends in a sine curve shape or a cosine curve shape in the circumferential direction, in the intraocular astigmatism acquisition step, the intraocular astigmatism parameter is determined according to the cornea front surface astigmatism parameter and the whole eye astigmatism parameter, and the cornea front surface astigmatism parameter is a parameter within 6mm, within 5mm or within 3mm of the cornea diameter.
In addition, in order to achieve the aim, the invention also relates to a cornea shaping lens manufacturing method, which comprises the steps of obtaining the size and the direction of the astigmatism of the front surface of the cornea and the astigmatism of the whole eye, determining the size and the direction of the astigmatism of the eye according to the size and the direction of the astigmatism of the front surface of the cornea, determining the curvature radius parameter of the annular surface of the base arc according to the size of the astigmatism of the eye, determining the direction parameter of the annular surface of the base arc according to the direction of the astigmatism of the eye, so that the cornea shaped by the base arc has a specified astigmatism which can compensate the astigmatism of the eye, obtaining the shape of the cornea area where the adaptive arc is located, and determining the angle between the curvature parameter of the adaptive arc area and the direction of the adaptive arc area according to the shape parameter of the adaptive arc area.
In the above manufacturing method, the predetermined astigmatism is substantially equal in magnitude and opposite in direction to the intraocular astigmatism, and the curvature radius parameter includes a flat K-direction curvature radius and a steep K-direction curvature radius, and the flat K-direction or the steep K-direction is used as the direction parameter.
In addition, to achieve the above object, the present invention also relates to a cornea shaping lens having an inner surface facing the cornea of a human eye when worn, the inner surface including a base arc region at the center, the base arc region having a toroidal curved shape, the base arc region being configured such that the cornea shaped by the base arc region has prescribed astigmatism which can compensate for intraocular astigmatism.
Preferably, the base arc region extends in a sine curve or a cosine curve in the circumferential direction.
Preferably, the inner surface further comprises a fitting arc zone located at the outer peripheral side of the base arc zone, and the fitting arc zone has a toroidal curved surface shape.
Preferably, an included angle alpha is formed between the annular curved surface shape of the base arc region and the annular curved surface shape of the adaptation arc region, and the included angle alpha is more than or equal to 0 degree and less than or equal to 180 degrees.
Preferably, for the base arc area, the direction with the largest curvature radius is called a flat K direction, the curvature radius is denoted as R1, the direction with the smallest curvature radius is called a steep K direction, the curvature radius is denoted as R2, wherein the R1 and R2 directions are mutually perpendicular, the base arc center of the cornea shaping mirror is taken as a vertex, a three-dimensional coordinate system is established, the optical axis direction of the cornea shaping mirror is taken as a Z axis, the optical axis is perpendicular, a plane passing through the base arc center is a base plane, Z is the height from the base plane at any point on the surface of the base arc, and the surface shape of the base arc area satisfies the formula:
C1 and C2 are curvatures of a base arc area in a flat K direction and a steep K direction, namely C1=1/R1, C2=1/R2, (R, θ) are polar coordinates of any point on the surface of the base arc projected onto a base plane, the polar coordinates take the center of the base arc as a center of a circle, and the steep K direction is a polar axis.
In the invention, preferably, the curvature radius R1 of the base arc area in the flat K direction is 6.00-10.50 mm, 7.00-10.00 mm or 7.50-9.50 mm, and the curvature radius R2 of the base arc area in the steep K direction is 5.42-10.26 mm, 6.23-9.78 mm or 6.62-9.30 mm.
In the invention, the diameter of the base arc area in the flat K direction is preferably 4.5-8.0 mm, 5.0-7.0 mm or 5.2-6.5 mm.
In the invention, preferably, the height difference between the planar K-direction surface shape height and the steep K-direction surface shape height of the base arc region at the diameter of 3.0mm is 10.7-101.8 microns, 10.7-75.8 microns or 10.7-50.2 microns.
Preferably, the curvature radius of the arc adapting area in the flat K direction is 6.00-9.50 mm, 6.50-9.00 mm or 7.00-8.50 mm, and the curvature radius in the steep K direction is 5.42-9.43 mm, 5.83-8.94 mm or 6.23-8.45 mm.
The invention provides a cornea shaping mirror with toric surface design in base arc area and design and manufacturing method thereof, by adopting the invention, cornea can have prescribed astigmatism after shaping, the prescribed astigmatism may be equal in magnitude and opposite in direction to the intraocular astigmatism, thereby being able to compensate or counteract the intraocular astigmatism and improve the vision and clarity of the human eye. In order to realize the directional stability of astigmatism, the cornea shaping lens has a toric design in an adaptive arc area, and the relative position stability between the cornea shaping lens and the cornea is realized through self-adaptive matching between tear and cornea topography. The included angle between the base arc area and the adaptive arc area is stable, so that the base arc area is limited to be stable to the astigmatic shaping direction of the cornea every night, and the astigmatic correction stability can be ensured.
< Definition of terms >
Unless otherwise indicated, the following definitions apply to the terms used in this specification.
A toroidal surface, an optical surface with different radii of curvature in different meridian directions, also known as Toric surface, toric surface.
The base arc area (BC) is positioned at the most center of the cornea shaping lens and is the inner surface of the optical area, and is used for pressing the cornea front surface and shaping the cornea front surface into the shape of the cornea front surface, and the shaped cornea area is the optical area and plays a role in optical imaging.
The reverse arc Region (RC) is a second region closely connected with the base arc region, plays a role in connecting the base arc region and the adaptation arc region, forms a gap between the cornea shaping lens and the cornea front surface, and plays a role in storing tears and promoting tear circulation.
The adaptation Arc (AC), also called the locating arc, the matching arc, etc., is immediately adjacent to the reversing arc, which matches the shape of the cornea, and serves as a location.
The side arc area (PC) is optional and is positioned at the outermost edge of the cornea shaping lens, is tightly connected with the adaptation arc area, is generally flatter than the adaptation arc area, presents a certain tilting angle with the cornea surface, and ensures the exchange and circulation of the cornea, tear and oxygen around the shaping lens.
Furthermore, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In the event of inconsistencies, the present description and the definitions included therein shall control.
Drawings
FIG. 1 is a view of a cornea shaping mirror as seen in the direction of the optical axis;
fig. 2 is a view of a base arc area seen in the optical axis direction;
FIG. 3 is an oblique view of the base arc region;
fig. 4 is a view showing the circumferential sagittal height of the base arc zone.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
< Overview of cornea shaping mirror Structure >
Fig. 1 is a view of the cornea shaping mirror seen in the optical axis direction, fig. 2 is a view of the base arc region seen in the optical axis direction, fig. 3 is an oblique view of the base arc region, and fig. 4 is a view of the circumferential direction sagittal height of the base arc region.
As shown in fig. 1, the cornea shaping lens 10 is provided with a base arc zone 1, a reverse arc zone 2, an adaptation arc zone 3 and an edge arc zone 4 which are distributed outwards from the center, wherein the base arc zone 1 is provided with a toroidal curved surface design, the curvature radiuses of the base arc zone are different in different meridian directions, the front view shape is towards an ellipse for shaping the cornea into a corresponding toroidal curved surface shape, myopia correction is carried out, meanwhile, the adaptation arc zone 3 provides a light-scattering quantity, the front view shape is towards an ellipse, the front view shape is consistent with the shape of the cornea in the area, the positioning function is achieved, the reverse arc zone 2 is the natural connection of the base arc zone and the adaptation arc zone, the edge shape close to the base arc zone is consistent with the base arc zone, the edge shape close to the adaptation arc zone is consistent with the adaptation arc zone, the edge arc zone 4 is of a normal circular design and slightly tilted compared with the shape of the cornea, and the tear circulation function is achieved. In some embodiments, the adapting arc region 3 and the side arc region 4 are the same arc, and are not distinguished.
The curvature radius of the base arc area 1 is different in different warp lines, in the 360-degree direction, the direction with the largest curvature radius is called a flat K direction (marked as y1, which coincides with the major axis direction of the ellipse when being observed along the optical axis direction, see fig. 3), the curvature radius is marked as R1, the direction with the smallest curvature radius is called a steep K direction (marked as x1, which coincides with the minor axis direction of the ellipse when being observed along the optical axis direction, see fig. 3), and the curvature radius is marked as R2, wherein the R1 and the R2 directions are perpendicular.
The method comprises the steps of establishing a three-dimensional coordinate system by taking the center of a base arc zone 1 of a cornea shaping lens as a vertex, wherein the direction of an optical axis of the cornea shaping lens is a Z axis, the optical axis is perpendicular to the optical axis, a plane passing through the center of the base arc zone is a base plane, Z is the height from any point on the surface of the base arc zone to the base plane, and the surface shape of the base arc zone 1 meets the formula:
Wherein, C1 and C2 are curvatures of the base arc area in the flat K direction and the steep K direction, namely C1=1/R1 and C2=1/R2. (r, θ) is the polar coordinates of any point on the surface of the base arc zone projected onto the base plane (see fig. 2), with the center of the base arc zone as the center and the steep K direction as the polar axis.
Referring to fig. 4, the base arc zone 1 satisfies a sine/cosine distribution state in a 360 degree circumferential direction by a height z.
The curvature radius R1 of the base arc area 1 in the flat K direction is between 6.00 and 10.50mm, preferably 7.00 to 10.00mm, more preferably 7.50 to 9.50mm. R2 is 5.42-10.26 mm, preferably 6.23-9.78 mm, more preferably 6.62-9.30 mm.
The diameter of the base arc area in the flat K direction is 4.5-8.0 mm, preferably 5.0-7.0 mm, more preferably 5.2-6.5 mm.
The height difference between the planar K-direction surface shape height and the steep K-direction surface shape height of the base arc region at the diameter of 3.0mm is 10.7-101.8 μm, preferably 10.7-75.8 μm, more preferably 10.7-50.2 μm.
Under the shaping of the base arc area, the cornea can obtain the astigmatism amount of 0.75-6.00D, and the astigmatism in the eye is corrected.
The annular curved surface of the adaptive arc region is similar to the base arc region in characteristic, and is also an annular curved surface with sine/cosine distribution in height, and the curvature radius of the adaptive arc region in the flat K direction is 6.00-9.50 mm, preferably 6.50-9.00 mm, more preferably 7.00-8.50 mm. The radius of curvature in the steep K direction is between 5.42 and 9.43mm, preferably between 5.83 and 8.94mm, more preferably between 6.23 and 8.45mm.
An included angle alpha exists between the flat K direction of the adaptive arc area and the flat K direction of the base arc area, and alpha is more than or equal to 0 degree and less than or equal to 180 degrees.
< Design and manufacturing method of cornea shaping mirror >
The cornea shaping lens design and manufacturing method of the embodiment comprises the following steps:
(1) Measuring the size and direction of the astigmatism of the front surface of cornea and the astigmatism of whole eye of human eye, and calculating the size T and direction of the astigmatism in eye Such as defining the direction of minimum optical power in the eye asTaking the curvature radius design target of the flat K and the steep K of the base arc area of the cornea shaping lens as the curvature radius design target, determining the shape of the base arc area of the cornea shaping lens, wherein the curvature radii R1 and R2 (corresponding to the curvature radius parameters of the base arc area in the invention) of the flat K and the steep K directions satisfy the following conditions:
wherein, the units of R1 and R2 are mm, and the unit of T is "D".
The measurement range is within 6mm, preferably within 5mm, more preferably within 3mm of the diameter of the cornea. The measuring method can be a combination of a cornea topography and an objective optometry, or a combination of a cornea topography and total eye aberration measuring equipment such as iTrace and the like, and other methods for judging the intraocular astigmatism and the front surface astigmatism size and direction of the cornea.
Astigmatism of the front surface of the cornea can be obtained through a corneal topography, the size and direction of astigmatism of the whole eye can be obtained through other methods or devices such as an objective optometry, and the size and direction of astigmatism in the eye are calculated by a vector calculation method:
Astigmatism of the anterior surface of the cornea is marked as Wherein T2 represents the magnitude of astigmatism of the anterior surface of the cornea,Axial representing the astigmatism of the anterior surface of the cornea, the astigmatism of the whole eye being marked asT3 represents the magnitude of astigmatism of the whole eye,Axial representing astigmatism of whole eye, the astigmatism in eye being marked asT1 represents the magnitude of the intraocular astigmatism,Representing the axial direction of intraocular astigmatism. Astigmatism in eyeIs astigmatism of the whole eyeAstigmatism with the anterior surface of the corneaVector differences of (c), namely:
Wherein,
The intraocular astigmatism value is determined, and the shape of the base curve area of the cornea shaping lens is determined. The toric surface of the base curve provides astigmatism of similar (or substantially the same) magnitude as the intraocular astigmatism and in the opposite direction, which compensates (counteracts) the intraocular astigmatism.
An example of determining intraocular astigmatism is given below:
a, before wearing, the whole eye astigmatism is-5.50 DS-3.00DC multiplied by 180, namely, the myopic degree is-5.50D, the astigmatism degree is-3.00D, and the astigmatism direction is 180 degrees.
B measurements of anterior corneal surface before wearing were 43.25D@180,46.75D@90, i.e. flat K value of 43.25D orientation 180℃and steep K value of 46.75D orientation 90 ℃.
C the astigmatism of the anterior surface of the cornea is 43.25-46.75= -3.50D, and the direction is 180 degrees.
The intraocular astigmatism d is whole eye astigmatism-cornea astigmatism= (-3.00×180) - (-3.50×180) =0.50×180.
(2) For example, according to a corneal topography, the shape of the region of the cornea in which the fitting arc region is located (the cornea region in which the fitting arc region is located) is measured, and the radii of curvature in the flat K and steep K directions of the fitting arc region are determined, so that the shape of the surface of the fitting arc region of the cornea shaping lens is determined. Recording the direction of the arc adapting area flat K as follows(The direction of the adaptation arc zone flat K, i.e. the direction of the cornea flat K, also acts as the direction of the cornea astigmatism. The adaptation arc zone flat K directionCorresponding to the "direction parameter of the toroidal curved surface of the adapted arc zone" in the present invention.
(3) According to the direction of the magnitude of the astigmatism in the eyeAnd the direction of the magnitude of the corneal astigmatismAdapting the planar K direction of the arc adapting regionDetermining the flat K direction of the base arc area of the cornea shaping lensAnd adapt to the arc area flat K directionIs included in the angle alpha. Wherein:
base arc area flat K direction I.e. the direction of astigmatism in the eye, the base curve zone being in the flat K directionThe direction parameter of the toroidal curved surface corresponds to the "base arc area" in the present invention.
After each parameter is determined, a cornea shaping mirror is fabricated.
< Design method example of curvature radii R1 and R2 in the base arc region flat K and steep K directions)
The refractive state of the cornea is primarily determined by its radius of curvature. In practical application, the conversion relation between the curvature radius of cornea and the diopter of cornea is commonly used:
Wherein K is the diopter of the cornea, the unit is D, R1 is the curvature radius of the front surface of the cornea in the direction of K, the unit is mm, and n is the refractive index of the cornea. For example, n may be 1.3375. When n is 1.3375, the above formula is
R1 is determined by the above formula, R2 is determined by R1 and intraocular astigmatism T, and the three relationships are as follows:
I.e.
Examples
Advantageous effects
By adopting the embodiment, the cornea is molded into the annular curved surface by the base arc area, the front surface of the cornea after molding can form a light-radiating surface, and the light-radiating surface has post-molding optical effect and can provide prescribed astigmatism, and the astigmatism is equal to the intraocular astigmatism in size and opposite in direction, so that the intraocular astigmatism is counteracted, and the vision and definition of human eyes are improved.
The adaptive arc area realizes the relative position stability between the cornea shaping lens and the cornea through self-adaptive matching between tear and cornea topography, and the astigmatic included angle between the base arc area and the adaptive arc area is stable, so that the astigmatic shaping direction of the cornea is limited to be stable every night by the base arc area, and the astigmatic correction stability can be ensured.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (25)
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| CN114545659B (en) * | 2022-03-03 | 2024-09-13 | 上海艾康特医疗科技有限公司 | Corneal contact lens and design method thereof |
| CN114967176B (en) * | 2022-06-15 | 2022-11-22 | 潍坊眼科医院有限责任公司 | Method and device for manufacturing orthokeratology lens based on cornea shape and refraction data |
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| EP2401648A4 (en) * | 2009-02-27 | 2014-01-08 | Euclid Systems Corp | Orthokeratology lens wear combined with chemical treatment to correct myopia, hyperopia or astigmatism |
| KR101435777B1 (en) * | 2010-04-13 | 2014-08-29 | 주식회사 루시드코리아 | Orthokeratologic contact lens for treating astigmatism and myopia |
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