CN112684611A - Corneal plastic mirror design method, manufacturing method and corneal plastic mirror - Google Patents
Corneal plastic mirror design method, manufacturing method and corneal plastic mirror Download PDFInfo
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- CN112684611A CN112684611A CN201910990181.XA CN201910990181A CN112684611A CN 112684611 A CN112684611 A CN 112684611A CN 201910990181 A CN201910990181 A CN 201910990181A CN 112684611 A CN112684611 A CN 112684611A
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Abstract
The invention provides a design method and a manufacturing method of a corneal shaping lens, wherein the shape parameters of a base arc area of the corneal shaping lens are determined according to the parameters of intraocular astigmatism, so that a cornea shaped by the base arc area has specified astigmatism, the specified astigmatism can be equal to the intraocular astigmatism in size and opposite in direction, and therefore the intraocular astigmatism can be compensated or offset, and the vision and definition of human eyes are improved.
Description
Technical Field
The invention relates to a corneal plastic mirror and a design method and a manufacturing method thereof, in particular to a design method and a manufacturing method of a corneal plastic mirror with an astigmatism shaping structure in a base arc area.
Background
The rigid air-permeable contact lens for cornea shaping (called cornea shaping lens for short) is a reversible and non-operative refractive correction product, generally has an inverse geometry design formed by several concentric circular arc regions, and has a base arc shaping region, an inverse arc region, a positioning region and other regions.
The base zone of orthokeratology lenses is generally designed as a sphere with a set radius of curvature, primarily for correcting myopia. Patent document 1 discloses a keratoplasty mirror having more than one curvature radius in the base curve region, in which the optical region of the cornea is shaped into several regions of different curvature radii, so that the human eye has a plurality of focal points simultaneously, and the ametropia is corrected while presbyopia is corrected. In patent document 2, there is mentioned a orthokeratology mirror having an aspherical base arc region for providing a suitable peripheral defocus or aberration. These designs all aim to shape the cornea into a 360 degree circumferential surface of rotational symmetry. Patent document 3 discloses a keratoplasty mirror, the inner surface of which is divided into a base arc area, an inversion arc area, a positioning arc area and a peripheral arc area from the center to the periphery, wherein the positioning arc area is a multi-area annular curved surface, and the positioning arc area on the inner surface of the keratoplasty mirror is designed into the multi-area annular curved surface, so as to improve the fit degree between the keratoplasty mirror and the cornea and achieve the effect of centering the lens.
Astigmatism is a low-order aberration common to human eyes, and has a direct influence on vision, and the resolution of human eyes is sharply reduced by astigmatism exceeding 0.75D. Astigmatism of human eyes is caused by different curvature radii (refractive powers) of different meridians, and light rays passing through different meridians cannot be focused (form focal points) at the same time in eyes but form two focal lines perpendicular to each other in space, which causes deformation of object images and blurred vision. The human eye is used as an optical system, the cornea and the crystalline lens are two large dioptric elements, the astigmatism of the human eye can be caused by any one of the two dioptric elements, or the two dioptric elements have astigmatism. Astigmatism has an axial direction, generally referred to as the angle between the direction of maximum/minimum power and the horizontal direction of the human eye. The astigmatism of the cornea and lens may be co-directional or non-directional.
After the orthokeratology lens is worn on the cornea with astigmatism, the central optical zone is shaped as a surface of rotational symmetry, and if the cornea of the wearer has astigmatism, the astigmatism of the cornea is corrected by wearing the orthokeratology lens. However, if the wearer has intraocular astigmatism, the intraocular astigmatism cannot be corrected after wearing the orthokeratology lens, and the visual quality is still affected, and if the direction of the corneal astigmatism and the direction of the intraocular astigmatism are originally complementary to each other, the total-eye astigmatism is increased after wearing the orthokeratology lens, so that the visual quality of the wearer is worse. The current cornea shaping mirror can not solve the problem of astigmatism in eyes.
Background art documents:
patent document 1: CN108008544A
Patent document 2: CN106291977A
Patent document 3: CN202453593U
Disclosure of Invention
The invention aims to provide a corneal shaping mirror with astigmatism correction function in a base arc area and a manufacturing method thereof, wherein the corneal shaping mirror can shape a corneal optical area into a specified astigmatism form, compensate astigmatism in eyes and reduce/correct astigmatism in the whole eyes.
To achieve the above object, the present invention provides a method for designing a orthokeratology mirror having an inner surface facing a cornea of a human eye when worn, the inner surface including a base arc region at a center, comprising the steps of: an intraocular astigmatism obtaining step of obtaining a parameter of intraocular astigmatism; and a base arc region parameter determining step of determining the shape parameter of the base arc region according to the intraocular astigmatism parameter, so that the cornea shaped by the base arc region has the prescribed astigmatism, and the prescribed astigmatism can compensate the intraocular astigmatism.
Unlike the conventional art, the present invention does not eliminate astigmatism of the cornea to be reshaped as much as possible, but rather makes the cornea have a certain astigmatism (i.e., a predetermined astigmatism) after reshaping, and can compensate or even eliminate the influence of the astigmatism in the eye by actively forming and controlling the astigmatism, thereby making the astigmatism in the whole eye controllable and reducing or correcting the astigmatism in the whole eye after reshaping.
Preferably, the base arc region has a toroidal shape.
In the present invention, the base arc region preferably extends in a sine curve or cosine curve in the circumferential direction.
Preferably, in the intraocular astigmatism obtaining step, the intraocular astigmatism parameter is determined based on the corneal anterior surface astigmatism parameter and the whole eye astigmatism parameter.
Preferably, the parameter of the corneal anterior surface astigmatism is a parameter within 6mm, within 5mm or within 3mm of the corneal diameter.
In addition, in order to achieve the above object, the present invention provides a method for designing a orthokeratology mirror, the orthokeratology mirror having an inner surface facing a cornea of a human eye when worn, the inner surface including a base arc region located at a center and a matching arc region located at an outer peripheral side of the base arc region, the base arc region and the matching arc region having a toroidal shape, the method comprising 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 direction of astigmatism in the eye according to the size and direction of the astigmatism on the front surface of the cornea and the astigmatism of the whole eye; determining the curvature radius parameter of the annular curved surface of the base arc area according to the size of the intraocular astigmatism, and determining the direction parameter of the annular curved surface of the base arc area according to the direction of the intraocular astigmatism, so that the cornea shaped by the base arc area has the specified astigmatism, and the specified astigmatism can compensate the intraocular astigmatism; obtaining the shape of a cornea area where the adaptive arc area is located, namely the shape of the cornea area where the adaptive arc area is located; determining the curvature radius parameter and the direction parameter of the adaptive arc area according to the shape of the area where the corneal adaptive arc area is located; and determining an included angle between the direction parameter of the base arc area and the direction parameter of the adaptive arc area.
Preferably, the prescribed astigmatism and the intraocular astigmatism have substantially the same magnitude and opposite directions.
Preferably, the curvature radius parameters comprise a flat K direction curvature radius and a steep K direction curvature radius,
in the present invention, a flat K direction or a steep K direction is preferably used as the direction parameter.
In addition, to achieve the above object, the present invention provides a method for manufacturing a orthokeratology mirror having an inner surface facing a cornea of a human eye when worn, the inner surface including a base arc region at a center, comprising the steps of: an intraocular astigmatism obtaining step of obtaining a parameter of intraocular astigmatism; and a base arc region parameter determining step of determining the shape parameter of the base arc region according to the intraocular astigmatism parameter, so that the cornea shaped by the base arc region has the prescribed astigmatism, and the prescribed astigmatism can compensate the intraocular astigmatism.
Preferably, the base arc area has a toroidal 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 obtaining step, determining the intraocular astigmatism parameter according to the parameter of the corneal anterior surface astigmatism and the parameter of the whole eye astigmatism; the parameter of corneal anterior surface astigmatism is a parameter within 6mm, within 5mm, or within 3mm of the corneal diameter.
In addition, in order to achieve the above object, the present invention also relates to a method for manufacturing a orthokeratology mirror, the orthokeratology mirror having an inner surface facing a cornea of a human eye when worn, the inner surface including a base arc region at a center and a mating arc region at an outer peripheral side of the base arc region, the base arc region and the mating arc region having an annular surface shape, the method comprising 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 direction of astigmatism in the eye according to the size and direction of the astigmatism on the front surface of the cornea and the astigmatism of the whole eye; determining the curvature radius parameter of the annular curved surface of the base arc area according to the size of the intraocular astigmatism, and determining the direction parameter of the annular curved surface of the base arc area according to the direction of the intraocular astigmatism, so that the cornea shaped by the base arc area has the specified astigmatism, and the specified astigmatism can compensate the intraocular astigmatism; obtaining the shape of a cornea area where the adaptive arc area is located, namely the shape of the cornea area where the adaptive arc area is located; determining the curvature radius parameter and the direction parameter of the adaptive arc area according to the shape of the area where the corneal adaptive arc area is located; and determining an included angle between the direction parameter of the base arc area and the direction parameter of the adaptive arc area.
In the manufacturing method, it is preferable that the prescribed astigmatism and the intraocular astigmatism have substantially the same magnitude and opposite directions; the curvature radius parameters comprise a flat K direction curvature radius and a steep K direction curvature radius, and the flat K direction or the steep K direction is taken as the direction parameters.
In addition, to achieve the above object, the present invention relates to a keratoplasty mirror having an inner surface facing a cornea of a human eye when worn, the inner surface including a base curve region located at a center, the base curve region having a toric shape, the base curve region being configured to provide a cornea reshaped by the base curve region with a prescribed astigmatism which can compensate for the intraocular astigmatism.
In the present invention, the base arc region preferably extends in a sine curve or cosine curve in the circumferential direction.
In the present invention, preferably, the inner surface further includes an adaptive arc region located on an outer peripheral side of the base arc region, and the adaptive arc region has a toroidal shape.
Preferably, an included angle alpha is formed between the shape of the toroidal surface of the base arc area and the shape of the toroidal surface of the adaptive arc area, and 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 called R1, the direction with the smallest curvature radius is called a steep K direction, the curvature radius is called R2, wherein the directions of R1 and R2 are perpendicular to each other, a three-dimensional coordinate system is established by taking the base arc center of the orthokeratology mirror as a vertex, the optical axis direction of the orthokeratology mirror is a Z axis, the plane passing through the base arc center is a base plane, Z is the height from the base plane of any point on the base arc surface, and the base arc area surface shape satisfies the formula:
c1 and C2 are curvatures in the flat K direction and the steep K direction of the base arc region, namely: c1 is 1/R1, C2 is 1/R2, and (R, θ) is the polar coordinate of any point on the base arc surface projected to the base plane, the polar coordinate uses the base arc center as the center of a circle and the steep K direction as the polar axis.
Preferably, the curvature radius R1 in the flat K direction of the base arc area is 6.00-10.50 mm, 7.00-10.00 mm or 7.50-9.50 mm, and the curvature radius R2 in the steep K direction is 5.42-10.26 mm, 6.23-9.78 mm or 6.62-9.30 mm.
Preferably, the diameter of the base arc area in the flat K direction is 4.5-8.0 mm, 5.0-7.0 mm or 5.2-6.5 mm.
Preferably, the height difference between the flat K direction surface shape height and the steep K direction surface shape height of the base arc area at the diameter position of 3.0mm is 10.7-101.8 mu m, 10.7-75.8 mu m or 10.7-50.2 mu m.
Preferably, the curvature radius of the adaptive arc 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 a base arc area having a toric design and a manufacturing method thereof. In order to realize the directional stability of astigmatism, the orthokeratology mirror has a toric design in an adaptive arc area, and the relative position stability between the orthokeratology mirror and the cornea is realized through the adaptive matching between tear fluid and corneal topography. And the included angle between the base arc area and the adaptive arc area is stable, so that the astigmatic moulding direction of the cornea is limited to be stable every night by the base arc area, and the stability of astigmatic correction can be ensured.
< definition of terms >
The following definitions apply to terms used in this specification unless otherwise specified.
Toric surfaces, an optical surface with different radii of curvature in different meridian directions, are also called Toric surfaces, Toric surfaces.
The basal arc zone (BC) is positioned at the most central part of the cornea shaping mirror and is the inner surface of the optical zone and is used for pressing the front surface of the cornea and shaping the front surface of the cornea into the shape, and the area of the shaped cornea is the optical zone and plays a role in optical imaging.
The reverse arc area (RC) is a second area closely connected with the base arc area, and plays a role in connecting the base arc area and the adaptive arc area, forming a gap between the orthokeratology lens and the front surface of the cornea, and playing a role in storing tears and promoting the circulation of the tears.
The adaptive arc Area (AC) is also called a positioning arc area, a matching arc area and the like, is close to the reversal arc area, and the area is matched with the shape of the cornea to play a role in positioning.
The side arc area (PC) is optional, is positioned at the outermost edge of the orthokeratology lens, is tightly connected with the adaptive arc area, is generally flatter than the adaptive arc area, and forms a certain tilting angle with the surface of the cornea, thereby ensuring the exchange and the circulation of tears and oxygen around the cornea and the orthokeratology lens.
Moreover, 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 case of inconsistency, the present specification and the definitions included therein shall control.
Drawings
FIG. 1 is a view of a orthokeratology mirror as seen in the direction of the optical axis;
FIG. 2 is a view of the base arc region as seen in the direction of the optical axis;
FIG. 3 is an oblique view of the base arc region;
fig. 4 is a graph of the change in base arc zone circumferential rise.
Detailed Description
Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.
< overview of corneal remodelling mirror Structure >
FIG. 1 is a view of a orthokeratology mirror as seen in the direction of the optical axis; FIG. 2 is a view of the base arc region as seen in the direction of the optical axis; FIG. 3 is an oblique view of the base arc region; fig. 4 is a graph of the change in base arc zone circumferential rise.
As shown in fig. 1, the orthokeratology mirror 10 is distributed with a base arc area 1, a reversal arc area 2, a matching arc area 3 and a side arc area 4 from the center to the outside, wherein the base arc area 1 has a toroidal surface design, the curvature radius is different in different meridian directions, the front view shape is similar to an ellipse, and the orthokeratology mirror is used for shaping the cornea into a corresponding toroidal surface shape, and provides the amount of astigmatism while correcting myopia; the adaptive arc area 3 has a toroidal curved surface design, the front view shape tends to be elliptical and is consistent with the shape of the cornea in the area, and the function of positioning is achieved; the reverse arc area 2 is the natural connection of the base arc area and the adaptive arc area, the edge shape close to the base arc area is matched with the base arc area, and the edge shape close to the adaptive arc area is matched with the adaptive arc area; the side arc area 4 is designed to be normal round, slightly tilted than the shape of the cornea, and plays a role in the circulation of tears. In some embodiments, the adaptive arc region 3 and the side arc region 4 are the same arc, and are not distinguished.
The base arc region 1 has different radii of curvature at different meridians, and in the direction of 360 °, the direction with the largest radius of curvature is called the flat K direction (denoted as y1, coinciding with the major axis of the ellipse when viewed along the optical axis, see fig. 3), the radius of curvature is denoted as R1, the direction with the smallest radius of curvature is called the steep K direction (denoted as x1, coinciding with the minor axis of the ellipse when viewed along the optical axis, see fig. 3), and the radius of curvature is denoted as R2, wherein R1 is perpendicular to the R2 direction.
The method comprises the following steps of establishing a three-dimensional coordinate system by taking the center of a base arc area 1 of the corneal shaping mirror as a vertex, wherein the optical axis direction of the corneal shaping mirror is a Z axis which is perpendicular to the optical axis, a surface passing through the center of the base arc area is a base plane, Z is the height of any point on the surface of the base arc area from the base plane, and the surface shape of the base arc area 1 meets the formula:
wherein, C1, C2 are the flat K direction of base arc zone, the curvature of steep K direction, namely: C1-1/R1, C2-1/R2. And (r, theta) is a polar coordinate (see fig. 2) of any point on the surface of the base arc area projected to the base plane, wherein the polar coordinate takes the center of the base arc area as the center of a circle and the steep K direction as a polar axis.
Referring to fig. 4, the base arc region 1 has a height z satisfying a sine/cosine distribution state in a circumferential direction of 360 degrees.
The curvature radius R1 of the base arc region 1 in the flat K direction is between 6.00 and 10.50mm, preferably, 7.00 to 10.00mm, and more preferably, 7.50 to 9.50 mm. R2 is between 5.42 and 10.26mm, preferably 6.23 to 9.78mm, and more preferably 6.62 to 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, and more preferably 5.2-6.5 mm.
The height difference between the flat K direction surface shape height and the steep K direction surface shape height of the basal arc area at the diameter of 3.0mm is 10.7-101.8 μm, preferably 10.7-75.8 μm, and 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 eyes is corrected.
The annular curved surface of the adaptive arc area is similar to the base arc area in characteristic and is also an annular curved surface with sine/cosine distribution in height, and the curvature radius of the adaptive arc area 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 curvature radius in the steep K direction is between 5.42 and 9.43mm, preferably between 5.83 and 8.94mm, and more preferably between 6.23 and 8.45 mm.
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 the alpha is more than or equal to 0 degree and less than or equal to 180 degrees.
< methods for designing and manufacturing orthokeratology mirror >
The method for designing and manufacturing the orthokeratology mirror comprises the following steps:
(1) measuring the size and direction of astigmatism on the anterior surface of the cornea and the whole eye, and calculating the size T and direction of the astigmatism
Such as defining the direction of minimum intraocular power as
Taking the curvature radius as the design target of the curvature radius of the flat K and steep K directions of the basal arc area of the orthokeratology lens, determining the shape of the basal arc area of the orthokeratology lens, wherein the curvature radii R1 and R2 (corresponding to the curvature radius parameter of the basal arc area) in the flat K direction and the steep K direction satisfy the following conditions:
wherein, the unit of R1 and R2 is mm, and the unit of T is 'D'.
The measurement range is within 6mm, preferably within 5mm, more preferably within 3mm of the corneal diameter. The measurement method can be the combination of a corneal topography and an objective optometry instrument, or the combination of the corneal topography and an eye-wide aberration measurement device such as iTrace, and other methods for judging the size and the direction of the intraocular astigmatism and the corneal anterior surface astigmatism.
The astigmatism of the anterior surface of the cornea can be obtained through a corneal topography, the size and the direction of the astigmatism of the whole eye can be obtained through other methods or equipment such as an objective refractometer, and the size and the direction of the astigmatism of the eye can be calculated through a vector calculation method:
astigmatism marking of anterior surface of cornea
Wherein T2 represents the magnitude of the corneal anterior surface astigmatism,
an axial direction representing the astigmatism of the anterior surface of the cornea; whole eye astigmatism mark
T3 represents the magnitude of the astigmatism of the whole eye,
axial direction representing astigmatism of the whole eye; intraocular astigmatism marks
T1 represents the magnitude of the intraocular astigmatism,
representing the axial direction of astigmatism in the eye. Intraocular astigmatism
Is astigmatism of whole eye
Astigmatism with the anterior surface of the cornea
Vector difference ofNamely:
wherein the content of the first and second substances,
the intraocular astigmatism value is determined, and the base arc zone shape of the corneal shaping mirror is further determined. The base curve toric surface provides astigmatism that is similar in magnitude (or substantially the same in magnitude) as the intraocular astigmatism, but in the opposite direction, and serves to compensate (counteract) the intraocular astigmatism.
An example of determining astigmatism in the eye is given below:
a, before wearing, the astigmatism of the whole eye is-5.50 DS-3.00DC multiplied by 180, namely the myopia degree is-5.50D, the astigmatism degree is-3.00D, and the astigmatism direction is 180 degrees.
b anterior corneal surface measurements before wear: 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 anterior corneal surface astigmatism is: 43.25-46.75 ═ 3.50D, direction 180 °.
d intraocular astigmatism is: astigmatism of whole eye-corneal astigmatism (-3.00 × 180) - (-3.50 × 180) ═ 0.50 × 180.
(2) For example, according to a corneal topography, the shape of the region where the corneal adaptation arc zone is located (the corneal region where the adaptation arc zone is located) is measured, and the curvature radius of the flat K direction and the curvature radius of the steep K direction of the adaptation arc zone are determined, so that the surface shape of the adaptation arc zone of the orthokeratology mirror is determined. Recording the direction of flat K of the adaptive arc zone as
(the direction of the fitting arc zone, flat K, is the direction of the corneal flat K, and also serves as the direction of corneal astigmatism
Corresponding to the "orientation parameter of the toroidal surface of the mating arc zone" in the present invention).
(3) According to the magnitude and direction of astigmatism in the eye
And the magnitude and direction of corneal astigmatism
Adapted to the flat K direction of the arc zone
Determining the flat K direction of the base arc zone of the orthokeratology mirror
In the direction of K with the adaptive arc region
The angle alpha of (a). Wherein:
base arc region in the direction of plane K
That is, the direction of astigmatism in the eye, the base curve region being in the K direction
This corresponds to "the orientation parameter of the toroidal surface of the base curve region" in the present invention.
After the parameters are determined, a orthokeratology lens is produced.
< method for designing radii of curvature R1 and R2 in the flat K and steep K directions of base arc region >
The refractive state of the cornea is largely determined by its radius of curvature. In practical applications, the common conversion relationship between the curvature radius of the cornea and the corneal diopter is as follows:
wherein K is the diopter of the cornea and has a unit of D, R1 is the curvature radius of the front surface of the cornea in the flat K direction and has a unit of 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 relationship is as follows:
namely, it is
Examples
Advantageous effects
By adopting the embodiment, the cornea is shaped into the annular curved surface by the base arc area, the front surface of the cornea can form the astigmatism surface after being shaped, the cornea has the optical effect after being shaped, and can provide the specified astigmatism, the astigmatism and the astigmatism in the eye have the same size and the opposite directions, so that the astigmatism in the eye is counteracted, and the vision and the definition of the eye are improved.
The adaptive arc area realizes the stability of the relative position between the corneal shaping mirror and the cornea through the adaptive matching between tears and corneal 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 by the base arc area is limited to be stable every night, and the stability of astigmatic correction can be ensured.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (25)
1. A method of designing a orthokeratology lens having an inner surface that, when worn, faces a cornea of a human eye, the inner surface including a centrally located base curve region,
the method comprises the following steps:
an intraocular astigmatism obtaining step of obtaining a parameter of intraocular astigmatism; and
and a base arc region parameter determining step, wherein the shape parameter of the base arc region is determined according to the intraocular astigmatism parameter, so that the cornea shaped by the base arc region has the prescribed astigmatism, and the prescribed astigmatism can compensate the intraocular astigmatism.
2. The method of claim 1, wherein the base arc region has a toric shape.
3. The method of claim 2, wherein the base arc zone extends in a circumferential direction in a sine curve or a cosine curve.
4. The method of claim 1, wherein in the step of obtaining astigmatism in the eye, the parameter of astigmatism in the eye is determined according to the parameter of astigmatism on the anterior surface of the cornea and the parameter of astigmatism on the whole eye.
5. The method of claim 4, wherein the design of the orthokeratology mirror is performed by a laser,
the parameter of corneal anterior surface astigmatism is a parameter within 6mm, within 5mm, or within 3mm of the corneal diameter.
6. A method of designing a orthokeratology lens having an inner surface facing a cornea of a human eye when worn, the inner surface including a base zone at a center and a mating zone at a peripheral side of the base zone, the base zone and the mating zone having an annular surface shape, comprising 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 direction of astigmatism in the eye according to the size and direction of the astigmatism on the front surface of the cornea and the astigmatism of the whole eye;
determining the curvature radius parameter of the annular curved surface of the base arc area according to the size of the intraocular astigmatism, and determining the direction parameter of the annular curved surface of the base arc area according to the direction of the intraocular astigmatism, so that the cornea shaped by the base arc area has the specified astigmatism, and the specified astigmatism can compensate the intraocular astigmatism;
obtaining the shape of a cornea area where the adaptive arc area is located, namely the shape of the cornea area where the adaptive arc area is located;
determining the curvature radius parameter and the direction parameter of the adaptive arc area according to the shape of the area where the corneal adaptive arc area is located;
and determining an included angle between the direction parameter of the base arc area and the direction parameter of the adaptive arc area.
7. The method of claim 6, wherein the prescribed astigmatism and the intraocular astigmatism are substantially the same magnitude and opposite directions.
8. The method of claim 6, wherein the design of the orthokeratology mirror is performed by a laser,
the curvature radius parameters comprise a flat K direction curvature radius and a steep K direction curvature radius, and the flat K direction or the steep K direction is taken as the direction parameters.
9. A method of manufacturing a orthokeratology lens having an inner surface that, when worn, faces a cornea of a human eye, the inner surface including a base zone located at a center,
the method comprises the following steps:
an intraocular astigmatism obtaining step of obtaining a parameter of intraocular astigmatism; and
and a base arc region parameter determining step, wherein the shape parameter of the base arc region is determined according to the intraocular astigmatism parameter, so that the cornea shaped by the base arc region has the prescribed astigmatism, and the prescribed astigmatism can compensate the intraocular astigmatism.
10. The method of claim 9, wherein the base arc region has a toric shape.
11. The method of claim 10, wherein the base arc zone extends in a circumferential direction in a sine curve or a cosine curve.
12. The method for manufacturing a keratoplasty lens according to claim 9, wherein in the intraocular astigmatism obtaining step, the parameter of intraocular astigmatism is determined based on the parameter of corneal anterior surface astigmatism and the parameter of whole eye astigmatism.
13. The method for manufacturing orthokeratology mirror according to claim 12,
the parameter of corneal anterior surface astigmatism is a parameter within 6mm, within 5mm, or within 3mm of the corneal diameter.
14. A method of manufacturing a orthokeratology lens having an inner surface facing a cornea of a human eye when worn, the inner surface including a base zone at a center and a mating zone at a peripheral side of the base zone, the base zone and the mating zone having an annular surface shape, comprising 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 direction of astigmatism in the eye according to the size and direction of the astigmatism on the front surface of the cornea and the astigmatism of the whole eye;
determining the curvature radius parameter of the annular curved surface of the base arc area according to the size of the intraocular astigmatism, and determining the direction parameter of the annular curved surface of the base arc area according to the direction of the intraocular astigmatism, so that the cornea shaped by the base arc area has the specified astigmatism, and the specified astigmatism can compensate the intraocular astigmatism;
obtaining the shape of a cornea area where the adaptive arc area is located, namely the shape of the cornea area where the adaptive arc area is located;
determining the curvature radius parameter and the direction parameter of the adaptive arc area according to the shape of the area where the corneal adaptive arc area is located;
and determining an included angle between the direction parameter of the base arc area and the direction parameter of the adaptive arc area.
15. The method of claim 14, wherein the prescribed astigmatism and the intraocular astigmatism are substantially the same magnitude and opposite directions.
16. The method for manufacturing orthokeratology mirror according to claim 14,
the curvature radius parameters comprise a flat K direction curvature radius and a steep K direction curvature radius, and the flat K direction or the steep K direction is taken as the direction parameters.
17. A orthokeratology lens having an inner surface that faces a cornea of a human eye when worn, the inner surface including a centrally located base curve region, the base curve region having a toric shape,
the base zone is configured to provide a prescribed astigmatism to the cornea shaped by the base zone, the prescribed astigmatism being capable of compensating for intraocular astigmatism.
18. The orthokeratology mirror of claim 17, wherein the base arc zone extends in a circumferential direction in a sine curve or a cosine curve.
19. The orthokeratology mirror of claim 17, wherein the inner surface further comprises a mating arc zone on a peripheral side of the base arc zone, the mating arc zone having an toric shape.
20. The orthokeratology mirror of claim 19, wherein the toric shape of the base arc and the toric shape of the mating arc have an angle α of 0 ° to 180 °.
21. The orthokeratology mirror of claim 17, wherein for the base arc zone, the direction with the largest radius of curvature is called the flat K direction, the radius of curvature is called R1, the direction with the smallest radius of curvature is called the steep K direction, the radius of curvature is called R2, wherein the R1 and R2 directions are perpendicular to each other, a three-dimensional coordinate system is established with the base arc center of the orthokeratology mirror as the vertex, wherein the optical axis direction of the orthokeratology mirror is the Z axis, the plane passing through the base arc center is the base plane, Z is the height from the base plane of any point on the base arc surface, and the base arc zone surface shape satisfies the following formula:
c1 and C2 are curvatures in the flat K direction and the steep K direction of the base arc region, namely: c1 is 1/R1, C2 is 1/R2, and (R, θ) is the polar coordinate of any point on the base arc surface projected to the base plane, the polar coordinate uses the base arc center as the center of a circle and the steep K direction as the polar axis.
22. The orthokeratology mirror of claim 21, wherein the base arc region has a flat K-direction radius of curvature R1 of 6.00-10.50 mm, 7.00-10.00 mm, or 7.50-9.50 mm, and a steep K-direction radius of curvature R2 of 5.42-10.26 mm, 6.23-9.78 mm, or 6.62-9.30 mm.
23. The orthokeratology mirror of claim 21, wherein the base zone has a flat-K diameter of 4.5-8.0 mm, 5.0-7.0 mm, or 5.2-6.5 mm.
24. The orthokeratology mirror of claim 21, wherein the base curve region has a height difference between a flat K-direction profile height and a steep K-direction profile height of 10.7-101.8 μm, 10.7-75.8 μm, or 10.7-50.2 μm at a diameter of 3.0 mm.
25. The orthokeratology mirror of claim 19 or 20, wherein the conformable arc region has a radius of curvature in the flat K direction of 6.00-9.50 mm, 6.50-9.00 mm or 7.00-8.50 mm and a radius of curvature in the steep K direction of 5.42-9.43 mm, 5.83-8.94 mm or 6.23-8.45 mm.
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| CN201910990181.XA CN112684611A (en) | 2019-10-17 | 2019-10-17 | Corneal plastic mirror design method, manufacturing method and corneal plastic mirror |
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| CN201910990181.XA CN112684611A (en) | 2019-10-17 | 2019-10-17 | Corneal plastic mirror design method, manufacturing method and corneal plastic mirror |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113806908A (en) * | 2021-08-04 | 2021-12-17 | 美视(杭州)人工智能科技有限公司 | Parameter processing method based on cornea shaping lens fitting and related equipment |
| CN114545659A (en) * | 2022-03-03 | 2022-05-27 | 上海艾康特医疗科技有限公司 | Corneal contact lens and design method thereof |
| CN114967176A (en) * | 2022-06-15 | 2022-08-30 | 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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2019
- 2019-10-17 CN CN201910990181.XA patent/CN112684611A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113806908A (en) * | 2021-08-04 | 2021-12-17 | 美视(杭州)人工智能科技有限公司 | Parameter processing method based on cornea shaping lens fitting and related equipment |
| CN114545659A (en) * | 2022-03-03 | 2022-05-27 | 上海艾康特医疗科技有限公司 | Corneal contact lens and design method thereof |
| CN114967176A (en) * | 2022-06-15 | 2022-08-30 | 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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