CN104808353B - Ortho-K - Google Patents
Ortho-K Download PDFInfo
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- CN104808353B CN104808353B CN201410039031.8A CN201410039031A CN104808353B CN 104808353 B CN104808353 B CN 104808353B CN 201410039031 A CN201410039031 A CN 201410039031A CN 104808353 B CN104808353 B CN 104808353B
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- segmental arc
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- reversion
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- 230000003287 optical effect Effects 0.000 claims description 13
- 230000008859 change Effects 0.000 claims description 12
- 210000004087 cornea Anatomy 0.000 abstract description 45
- 230000006641 stabilisation Effects 0.000 abstract description 10
- 238000011105 stabilization Methods 0.000 abstract description 10
- 238000003860 storage Methods 0.000 abstract description 9
- 230000000007 visual effect Effects 0.000 abstract description 3
- 238000000465 moulding Methods 0.000 description 20
- 230000004075 alteration Effects 0.000 description 15
- 230000000694 effects Effects 0.000 description 9
- 230000003247 decreasing effect Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004379 myopia Effects 0.000 description 2
- 208000001491 myopia Diseases 0.000 description 2
- 210000001747 pupil Anatomy 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 210000002919 epithelial cell Anatomy 0.000 description 1
- 210000005081 epithelial layer Anatomy 0.000 description 1
- 210000000744 eyelid Anatomy 0.000 description 1
- 230000004438 eyesight Effects 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005226 mechanical processes and functions Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 210000001525 retina Anatomy 0.000 description 1
- 230000001225 therapeutic effect Effects 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/04—Contact lenses for the eyes
- G02C7/047—Contact lens fitting; Contact lenses for orthokeratology; Contact lenses for specially shaped corneae
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- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Eyeglasses (AREA)
Abstract
The present invention relates to Ortho-K.The inner surface of the Ortho-K is outwardly continuously set from center：Base curve area, reversion arc area, positioning arc area and circumference arc area.The center of circle of the basic spherical arc of reversion arc segmental arc is not on the center of circle of basic spherical arc of base curve segmental arc with the line in the center of circle of the basic spherical arc of positioning arc segmental arc.Ortho-K of the invention can control the difference of the refractive power for inverting arc and base curve in a value for stabilization, so as to ensure tear storage area capacity stabilization, it is ensured that the security and validity of lens wear；The matching degree in eyeglass match arc area and cornea shape is improved, and reduces arc area linking hop count, improve surface smoothness；Visual quality when patient wears can be improved simultaneously.
Description
Technical field
The invention mainly relates to the design field of eye optometry.Specifically, there is brand-new design the present invention relates to one kind
Ortho-K.
Background technology
Ortho-k（Orthokeratology（Ortho-K））It is by the active of specially designed Ortho-K, has
Step, it is progressive, scientifically change cornea configuration, quickly to improve UCVA, control adolescent myopia develops into target
A special kind of skill.
The moulding mirror of modern cornea uses " reversion geometry " design principle, by the inner surface configuration of Ortho-K be designed to
Anterior surface of cornea geometry is reached using the mechanical function of tear and " rectified conversely, manufacture some gaps between eyeglass and cornea
Shape " effect.Ortho-K is rigid glasses, wears and clipped between rear lens inner surface and outer corneal surface one layer of skewness
Even tear, the hydrodynamics effect of tear is by the epithelial cell of Central corneal to middle all portions（Periphery）Draw；Meanwhile, close one's eyes and blink
At the moment, the effect of eyelid causes that eyeglass center imposes certain pressure to inferior cornea.Both effects cause Central corneal bent
Rate flattens, and central epithelial layer is thinning, and middle all portions are thickening, is moved near retina direction depending on thing imaging point.Wear a period of time
Afterwards, anterior surface of cornea shape tends to consistent with surface after Ortho-K, when the excision moulding use rigid gas permeable contact lens of cornea, angle
Film remains in that the shape on surface after Ortho-K, so that myopia degree reduction is even eliminated.The change of this shape is
Short-term, after stopping wearing Ortho-K, cornea can return to former form.
" reversion geometry " design of Ortho-K was proposed in 1989 by Stoyan（US 4952045）, it is initial
Ortho-K is divided into three Ge Hu areas by reversion geometry designs, including base curve, reversion arc and circumference arc, anti-due to this design
Turn arc very wide, edge tilts highly larger, the easily initiation random movement of eyeglass, clinically with larger limitation.It is existing
The Ortho-K of generation " reversion geometry " design is improved reversion geometric areas, is generally divided into four regions.Fig. 1 is interior table
Face is longitudinal center's generalized section of Ortho-K in the prior art that four arc areas design.As shown in fig. 1, base curve area 1 connects
The middle section of eye cornea is touched, face shape is relatively flat, for flattening anterior corneal surface；Reversion arc area 2 is more precipitous, for consolidating
The pressing effect of base curve, and ensure certain tear storage capacity；Positioning arc area 3 can be also regarded as with Shi Hu areas, be mainly used in steady
Horizontal glass piece；Zhou Hu areas 4 ensure the circulation of cornea and Ortho-K periphery tear.
The inner surface of Ortho-K is moulding functional realiey region, and most design is carried out for this region, side
Method is directed to two variables of radius of curvature and width in four Ge Hu areas, and the requirement according to patient's cornea shape and diopter is entered respectively
Row design.
The design for being now widely used for production is general using 4-7 or the 5-7 circular arc dovetail of different curvature radius
Into the curved surface of each segmental arc is sphere.Fig. 2 is another longitudinal center's generalized section of prior art Ortho-K, should
The design feature of prior art Ortho-K is clearly show in figure.As shown in Figure 2, four arc areas are most basic setting
Meter, four Ge Hu areas using four different radius of curvature spheres, and each sphere the centre of sphere（That is the centre of sphere O of the sphere of base curve area 11、
The centre of sphere O of the sphere of reversion arc area 22, the sphere of positioning arc area 3 centre of sphere O3）Collinearly, i.e., on the Y of same axis（Such as patent CN
Described in 1256908A, US 005963297A）, in Ge Hu areas, joining place carries out chamfering, makes each segmental arc natural sparse model.5-7 circle
Arc linking refers in reversion arc and positioning arc multiple circular arc（Such as invert arc and include two sections of circular arcs, positioning arc includes three sections of circles
Arc）, so as to base curve is connected with reversion arc be easier, and positioning arc is more matched with cornea shape（Because cornea is aspherical, adopt
The form of " aspherical " is fitted with multiple spheres）.Product information on the market is not yet displayed without any a angle at present
The moulding mirror of film employs aspherical design.
No matter the design of Ortho-K inner surface, current Ortho-K outer surface uses simple ball
Face, is used to reach correct dioptric.
However, the Ortho-K of prior art is primarily present defect and deficiency：
（1）The reversion arc design of the Ortho-K of prior art is used with base curve, the positioning arc center of circle in same center line
Circular arc, the two is linked up smoothly naturally, the shortcoming of this design is, the refractive power difference between reversion arc and base curve is unstable,
The existing moulding mirror of open report inverts the refractive power 3-15D bigger than base curve area in arc area, and in fact difference may be far longer than
3-15D this span, causes tear storage area capacity unstable, and the moulding effect of moulding mirror of different decreasing concentrations is also unstable, drop
Low therapeutic effect.
（2）The Ortho-K of prior art is put most energy in design on an internal surface, in design direction
On to make every effort to make Ortho-K to wear more comfortable, reach more preferable moulding effect, and do not consider Ortho-K optical property
Improvement.Ortho-K is generally night and wears type, although need not play in most cases regarding thing effect, but in special feelings
Condition, such as evening are got up in the night to urinate, drink water, are answered the door, and wearer needs to regard thing, and such case is essentially night scotopia condition,
Human eye pupil is larger, and in the optical system that Ortho-K is constituted with human eye, the light school district that Ortho-K works is also larger,
6mm can be reached even more big.Existing Ortho-K light school district is not limited spherical aberration, under big clear aperature, cornea
Moulding mirror can bring extra spherical aberration to the optical system of Ortho-K and human eye composition, influence the visual quality of wearer.
In light school district using the aspherical spherical aberration size that can effectively limit optical lens, existing Ortho-K product
The overwhelming majority is in light school district using double spherical designs.Also have and used on the inner surface of Ortho-K product as previously mentioned
The design of " aspherical " that fits, but its purpose is to make shape of the cornea after moulding be changed into table in Ortho-K
The shape in face, is not intended to improve the optical quality of patient Dai Jingshi.And " aspherical " design that will be fitted is placed on cornea
The inner surface of moulding mirror, if eyeglass run-off the straight or bias when wearing, anterior surface of cornea will be shaped as and opthalmic optics
The shape of system decentraction, causes patient to produce halation, the phenomenon such as dazzle, have a strong impact on it is moulding after opthalmic optics' mass.It is non-
The visible patent CN2013/000057 of influence produced to system optics quality when sphere run-off the straight and bias（PCT Patent Application
Number）.
（3）Cornea is non-sphere form, for positioning arc area and the anterior corneal surface directly contact of stabilized lenses, it is therefore desirable to
There is matching degree very high with cornea, and reduce the position for needing chamfering to be connected as far as possible, prevent rough inner surface from causing cornea uncomfortable
Phenomenon.Existing positioning arc area uses the circular arc dovetail analog cornea peripheral shape of several different curvature radius, the rank of each circular arc
The place of connecing is unsmooth and needs many places chamfering, and can not be matched completely with cornea peripheral shape.
The content of the invention
The present invention in view of above mentioned problem in the presence of prior art and propose.Inventor is by innovatively using reversion
The center of circle of the basic spherical arc of arc segmental arc not base curve segmental arc basic spherical arc the center of circle with positioning arc segmental arc basic sphere
Design on the line in the center of circle of arc, and selectively set using brand-new optics on the outer surface of the Ortho-K
Meter, its object is to the difference of refractive power that controls to invert arc and base curve in a value for stabilization, so as to ensure tear storage area
Capacity stabilization, it is ensured that the security and validity of lens wear；The matching degree in eyeglass match arc area and cornea shape is improved, and is subtracted
Shao Hu areas are connected hop count, improve surface smoothness；Visual quality when patient wears is improved simultaneously.
Term is defined
The term " inner surface of Ortho-K " for using in this application directly connects when referring to wearing with eye cornea
That surface of tactile Ortho-K.
The term " outer surface of Ortho-K " for using in this application refers to the inner surface phase with Ortho-K
To that surface.
The term " base curve segmental arc " for using in this application refers to base curve area in the inner surface with Ortho-K
Heart summit is set up in two-dimensional coordinate system X/Y plane for origin（On longitudinal center's section of Ortho-K）The segmental arc for being presented.
The term " reversion arc segmental arc " for using in this application refers to reversion arc area with the inner surface of Ortho-K
Culminating point set up in two-dimensional coordinate system X/Y plane for origin（On longitudinal center's section of Ortho-K）Presented
Segmental arc.
The term " positioning arc segmental arc " for using in this application refers to positioning arc area with the inner surface of Ortho-K
Culminating point set up in two-dimensional coordinate system X/Y plane for origin（On longitudinal center's section of Ortho-K）Presented
Segmental arc.
The term " circumference arc segmental arc " for using in this application refers to circumference arc area with the inner surface of Ortho-K
Culminating point set up in two-dimensional coordinate system X/Y plane for origin（On longitudinal center's section of Ortho-K）Presented
Segmental arc.
When the inner surface/outer surface of Ortho-K of the invention is using aspherical（Such as high order aspheric surface, complex loop are bent
Face etc.）During design, this can be considered as increasing aspheric on the imaginary basic sphere of the inner surface/outer surface of Ortho-K
Face（Such as high order aspheric surface, complex loop curved surface）Design.If for example, specific on the inner surface/outer surface of Ortho-K
Arc area is using if spherical design, then so-called its basic sphere and the sphere referred to pair as if identical.Therefore, exist
Term " basic spherical arc " used herein refers to the inner surface/outer surface of Ortho-K（Correspondence）Imaginary basis
Segmental arc included in sphere, such as shown in Fig. 1,4,7.
Specifically, the present invention relates to the content of following many aspects：
1. a kind of Ortho-K,
Two-dimensional coordinate system XY is set up by origin of the culminating point of the inner surface of the Ortho-K, the cornea is moulding
The inner surface of mirror is outwardly continuously set from the origin：Base curve area including base curve segmental arc, the reversion including inverting arc segmental arc
Arc area, the positioning arc area including positioning arc segmental arc and circumference arc area including circumference arc segmental arc, with the origin with it is described
The tangent straight line of base curve segmental arc is the axis of abscissas X of the two-dimensional coordinate system, with by the origin, perpendicular to axis of abscissas X
And the straight line in the plane being made up of with the base curve segmental arc axis of abscissas X is axis of ordinates Y,
Curve of the inner surface of the Ortho-K on the two-dimensional coordinate system plane XY is on axis of ordinates Y pairs
Claim,
In the two-dimensional coordinate system, base curve segmental arc is with the connection point coordinates of reversion arc segmental arc（a1, b1）, invert arc arc
Section with position arc segmental arc connection point coordinates be（a2, b2）, inverting the central coordinate of circle of the basic spherical arc of arc segmental arc is（X, y）,
The inner surface of the Ortho-K is by the curve negotiating around axis of ordinates（Y）Carry out it is rotationally symmetrical change and
Obtain,
Characterized in that,
Y is not zero；And
The central coordinate of circle of the basic spherical arc of the reversion arc segmental arc（X, y）Meet relationship below：
Wherein R is the radius of curvature of the basic sphere in the reversion arc area.
2. the Ortho-K according to aspect 1, it is characterised in that the reversion arc segmental arc is one section of sphere segmental arc
Or one section of aspherical segmental arc.
3. the Ortho-K according to aspect 1, it is characterised in that the radius of curvature of the base curve segmental arc is 7.50-
9.93 millimeters, the reversion arc segmental arc is one constant in the range of 3D-15D relative to the additional optical focal power of the base curve segmental arc
Value, the scope of the radius of curvature of the basic spherical arc of the reversion arc segmental arc is 5.95-9.29 millimeters.
4. the Ortho-K according to aspect 1, it is characterised in that the positioning arc of the Ortho-K inner surface
Area is aspherical with what cornea shape matched.
5. the Ortho-K according to any one of foregoing aspect 1-4, it is characterised in that the Ortho-K
Outer surface be include sphere, aspherical, complex loop curved surface, the multi-focal-plane of multi-region refractive design and multi-region diffractive designs multifocal
One kind in the face shape in face.
6. the Ortho-K according to aspect 5, it is characterised in that the lens thickness of the Ortho-K exists
In the range of 0.18-0.25 millimeters.
7. the Ortho-K according to aspect 5, it is characterised in that the outer surface face shape of the Ortho-K is
Make the high order aspheric surface that spherical aberration of the eyeglass of the Ortho-K under 6mm apertures is zero.
8. the Ortho-K according to aspect 7, it is characterised in that
Two-dimensional coordinate system ZR is set up by origin of the culminating point of the outer surface of the Ortho-K, with the origin
Place's straight line tangent with the outer surface is the axis of abscissas Z of the two-dimensional coordinate system；With by the origin, perpendicular to horizontal seat
The straight line of parameter Z is axis of ordinates R,
Curve of the high order aspheric surface on the two-dimensional coordinate system plane ZR meets relationship below：
Wherein, c is the surface curvature of the outer surface basis sphere of the Ortho-K, Q, A4、A6、A8、A10For aspherical
Coefficient, r is vertical range of any point away from axis of abscissas Z on the curve,
The outer surface of the Ortho-K is carried out rotationally symmetrical change by the curve negotiating and is obtained around axis of ordinates R
Arrive.
Technical scheme especially has the advantages that：
New Ortho-K of the invention can control the difference of the refractive power for inverting arc and base curve in a value for stabilization,
So as to ensure tear storage area capacity stabilization, it is ensured that the security and validity of lens wear；Improve eyeglass match arc area with
The matching degree of cornea shape, and arc area linking hop count is reduced, improve surface smoothness；Regarding when patient wears can be improved simultaneously
Feel quality.
Brief description of the drawings
According to following accompanying drawing and explanation, feature of the invention, advantage will become more to understand, wherein：
Fig. 1 is longitudinal center's generalized section of Ortho-K in the prior art that inner surface is the design of four arc areas；
Fig. 2 is another longitudinal center's generalized section of prior art Ortho-K, is clearly show in the figure existing
There is the design feature of technology Ortho-K；
Fig. 3 is longitudinal center's generalized section of Ortho-K product according to an embodiment of the invention；
Fig. 4 is another longitudinal center's generalized section of Ortho-K according to an embodiment of the invention, the figure
In clearly show the design feature of Ortho-K of the present invention；
Fig. 5 is the eyeglass of the Ortho-K using prior art design（Front and rear surfaces are sphere）Contrast MTF figure.
Dotted line is diffraction limit in figure, is the optimal MTF of optics that eyeglass can reach；Solid line is the MTF curve that actual measurement is obtained in figure；
Fig. 6 is using the contrast MTF figures of the eyeglass of the Ortho-K of design of the invention.Dotted line is diffraction pole in figure
Limit, is the optimal MTF of optics that eyeglass can reach；Solid line is the MTF curve that actual measurement is obtained in figure.
Fig. 7 is longitudinal center's generalized section of the Ortho-K according to an alternative embodiment of the invention, in the figure
Specifically illustrate the positioning arc design feature of Ortho-K of the present invention.
Make same or analogous element is indicated with like reference numerals in the drawing of the present application.
Drawing reference numeral explanation
1 base curve area（Base curve segmental arc）
2 reversion arc areas（Reversion arc segmental arc）
3 positioning arc areas（Positioning arc segmental arc）
4 circumference arc areas（Circumference arc segmental arc）
5 corneas
The culminating point of the inner surface of O Ortho-Ks
O1The center of circle of the basic spherical arc of base curve segmental arc
O2Invert the center of circle of the basic spherical arc of arc segmental arc
O3Position the center of circle of the basic spherical arc of arc segmental arc
A1The tie point of base curve segmental arc and reversion arc segmental arc, its coordinate is（a1, b1）
A2The tie point of arc segmental arc and positioning arc segmental arc is inverted, its coordinate is（a2, b2）.
Specific embodiment
Specific examples below is only intended to that explanation is further explained to the present invention, but the present invention does not limit to
In following specific embodiment.Any change on the basis of these embodiments, as long as meeting spirit of the invention
And scope, fall within the covering scope of patent of the present invention.
The lens thickness of Ortho-K of the invention is substantially in the range of 0.18-0.25 millimeters.Base curve area is cornea
The lens optical area of moulding mirror, its diameter is according to 5.5-7.0 millimeters of wearer's pupil size scope（Such as 6.0 millimeters）Design,
Radius of curvature 7.50-9.93 millimeters, using zero aberration spherical design or zero aberration aspheric design.
Fig. 3 is longitudinal center's generalized section of Ortho-K according to an embodiment of the invention.Fig. 4 is basis
Another longitudinal center's generalized section of the Ortho-K of one embodiment of the present of invention, this hair is clearly show in the figure
The design feature of bright Ortho-K.
Two-dimensional coordinate system XY, such as Fig. 3 and Fig. 4 are set up by origin of the culminating point O of the inner surface of the Ortho-K
Shown in the inner surface of Ortho-K outwardly continuously set from the origin：Base curve area 1 including base curve segmental arc, include
The reversion arc area 2 of reversion arc segmental arc, the positioning arc area 3 including positioning arc segmental arc and the circumference arc area 4 including circumference arc segmental arc, with
The straight line tangent with the base curve segmental arc is the axis of abscissas X of the two-dimensional coordinate system at the origin, with by the original
Point, the straight line perpendicular to axis of abscissas X and in the plane being made up of with the base curve segmental arc axis of abscissas X are axis of ordinates
Y.The lens thickness is 0.20 millimeter.
As shown in Figure 4, curve of the inner surface of the Ortho-K on the two-dimensional coordinate system plane XY on
Axis of ordinates Y is symmetrical.
In the two-dimensional coordinate system, the tie point A of base curve segmental arc and reversion arc segmental arc1Coordinate be（a1, b1）, reversion
Arc segmental arc and the tie point A for positioning arc segmental arc2Coordinate be（a2, b2）, invert the center of circle O of the basic spherical arc of arc segmental arc2Coordinate
It is（X, y）, wherein y is not zero, and this is that is, the center of circle O of the basic spherical arc of reversion arc segmental arc2Not in the base of base curve segmental arc
The center of circle O of plinth spherical arc1With the center of circle O of the basic spherical arc of positioning arc segmental arc3Line on, the advantage of this design is, can
To control the difference of the refractive power for inverting arc and base curve in a value for stabilization, so as to ensure tear storage area capacity stabilization, protect
Demonstrate,prove the security and validity of lens wear（The tear storage capacity of Ortho-K directly determines moulding effect）.Also, it is described
Invert the central coordinate of circle of the basic spherical arc of arc segmental arc（X, y）Meet relationship below（1）：
(1)
Wherein R is the radius of curvature of the basic sphere in the reversion arc area.
The inner surface of the Ortho-K is carried out rotationally symmetrical change by the curve negotiating and is obtained around axis of ordinates Y
Arrive.
In this embodiment, the reversion arc segmental arc is one section of sphere segmental arc.But for those skilled in the art
For, the reversion arc segmental arc can also be one section of aspherical segmental arc.Design of the invention, the curvature of the base curve segmental arc
Radius is 7.50-9.93 millimeters, and the reversion arc segmental arc is in 3D-15D models relative to the additional optical focal power of the base curve segmental arc
An interior steady state value is enclosed, the scope of the radius of curvature of the basic spherical arc of the reversion arc segmental arc is 5.95-9.29 millimeters.
The design example of the inner surface of Ortho-K of the invention see the table below 1, and wherein n is that the refractive power of moulding mirror material refers to
Number, D is additional power, and R is base curve area radius of curvature, and R ' is reversion arc area radius of curvature.Addition power is bigger, and tear is deposited
Storage space is bigger.
The design example of the inner surface of the Ortho-K of the invention of table 1（Unit：mm）
| R | a1 | b1 | a2 | b2 | D | R’ |
| 7.50 | 0.52 | 2.75 | 0.69 | 3.15 | 3.0 | 7.13 |
| 9.93 | 0.39 | 2.75 | 0.51 | 3.15 | 3.0 | 9.29 |
| 7.50 | 0.52 | 2.75 | 0.69 | 3.15 | 10.0 | 6.39 |
| 9.93 | 0.39 | 2.75 | 0.51 | 3.15 | 10.0 | 8.07 |
| 7.50 | 0.52 | 2.75 | 0.69 | 3.15 | 15.0 | 5.95 |
| 9.93 | 0.39 | 2.75 | 0.51 | 3.15 | 15.0 | 7.38 |
| 7.50 | 0.87 | 3.5 | 1.09 | 3.9 | 3.0 | 7.13 |
| 9.93 | 0.64 | 3.5 | 0.80 | 3.9 | 3.0 | 9.29 |
| 7.50 | 0.87 | 3.5 | 1.09 | 3.9 | 10.0 | 6.39 |
| 9.93 | 0.64 | 3.5 | 0.80 | 3.9 | 10.0 | 8.07 |
| 7.50 | 0.87 | 3.5 | 1.09 | 3.9 | 15.0 | 6.39 |
| 9.93 | 0.64 | 3.5 | 0.80 | 3.9 | 15.0 | 8.07 |
| 7.50 | 0.52 | 2.75 | 1.00 | 3.75 | 3.0 | 7.13 |
| 9.93 | 0.39 | 2.75 | 0.74 | 3.75 | 3.0 | 9.29 |
| 7.50 | 0.52 | 2.75 | 1.00 | 3.75 | 10.0 | 6.39 |
| 9.93 | 0.39 | 2.75 | 0.74 | 3.75 | 10.0 | 8.07 |
| 7.50 | 0.52 | 2.75 | 1.00 | 3.75 | 15.0 | 6.39 |
| 9.93 | 0.39 | 2.75 | 0.74 | 3.75 | 15.0 | 8.07 |
| 7.50 | 0.87 | 3.5 | 1.5 | 4.5 | 3.0 | 7.13 |
| 9.93 | 0.64 | 3.5 | 1.08 | 4.5 | 3.0 | 9.29 |
| 7.50 | 0.87 | 3.5 | 1.5 | 4.5 | 10.0 | 6.39 |
| 9.93 | 0.64 | 3.5 | 1.08 | 4.5 | 10.0 | 8.07 |
| 7.50 | 0.87 | 3.5 | 1.5 | 4.5 | 15.0 | 6.39 |
| 9.93 | 0.64 | 3.5 | 1.08 | 4.5 | 15.0 | 8.07 |
Fig. 5 is the eyeglass of the Ortho-K using prior art design（Front and rear surfaces are sphere）Contrast MTF figure.
Dotted line is diffraction limit in figure, is the optimal MTF of optics that eyeglass can reach；Solid line is the MTF curve that actual measurement is obtained in figure.
Fig. 6 is that curve is A diffraction limits in figure, is eyeglass using the contrast MTF figures of the eyeglass of the Ortho-K of design of the invention
The optimal MTF of optics that can be reached；Solid line is the MTF curve that actual measurement is obtained in figure.
MTF is that lens optical image quality is most comprehensively evaluated.Fig. 5 is to use existing design（Front and rear surfaces are ball
Face）Eyeglass MTF figures, the MTF of Fig. 6 present invention gained eyeglasses, dotted line in figure is diffraction limit, is the light that eyeglass can reach
Learn optimal MTF.From the figure, it can be seen that using the eyeglass MTF of existing design（Referring to the solid line in Fig. 5）From diffraction limit（Ginseng
The dotted line seen in Fig. 5, optimal imaging quality）Still there is certain gap, and using after design of the invention, eyeglass spherical aberration is disappeared
Remove, the MTF of eyeglass overlaps with the desired diffractive limit（Referring to dotted line and solid line in Fig. 6）, improve lens imaging quality.
Fig. 7 is longitudinal center's generalized section of the Ortho-K according to an alternative embodiment of the invention, in the figure
Specifically illustrate the positioning arc design feature of Ortho-K of the present invention.
As it is known to the person skilled in the art, the Ortho-K of prior art is using sphere processing technology system
Make, the circular arc of certain curvature radius can only be cut in a certain segmental arc, it is impossible to cut the segmental arc that radius of curvature occurs continuity change
（It is i.e. aspherical）, therefore existing moulding mirror is in design, using the circular arc dovetail analog cornea periphery of several different curvature radius
Shape, circular arc can be two, or multiple, and joining place is unsmooth and needs many places chamfering, and with cornea peripheral shape
Can not match completely.
It is aspherical and due to straight with anterior corneal surface for stablizing the positioning arc area of Ortho-K eyeglass due to cornea
Contact, therefore as shown in Figure 7, the inner surface of Ortho-K according to an embodiment of the invention is in positioning arc area 3
It is completely the same with the shape of cornea 5 using the design matched with cornea shape, and positioning segmental arc 3 and reversion arc segmental arc 2 and periphery
Arc segmental arc 4 is in smoothing junction, and then reduces the position for needing chamfering to be connected in positioning arc area as far as possible, prevents Ortho-K inner surface
The coarse phenomenon for causing cornea uncomfortable.The present invention uses aspherical mirror machining technique, using machining tool in axially and radially equal energy
The characteristic of continuous high-resolution change, machined surface shape consecutive variations it is aspherical, make its in shape completely with cornea face shape
Match somebody with somebody, aspherical parameter can be selected according to the shape of individual cornea, carry out personalized designs.The aspheric that this processing mode is obtained
Face face shape is smooth without chamfering.
According to a preferred embodiment of the present invention, the face in the positioning arc area of Ortho-K eyeglass inner surface of the invention
Shape is high order aspheric surface.Two-dimensional coordinate system XY is set up by origin of the culminating point O of the Ortho-K inner surface（Fig. 4）,
With by the origin, perpendicular to axis of abscissas X and straight in the plane being made up of with the base curve segmental arc axis of abscissas X
Line is axis of ordinates Y, and curve of the high order aspheric surface on the two-dimensional coordinate system plane XY meets relationship below：
Wherein, c is the surface curvature of the positioning arc area basis sphere of the Ortho-K inner surface（That is radius of curvature
It is reciprocal）, Q, A4、A6、A8、A10It is the asphericity coefficient in the positioning arc area of the Ortho-K inner surface（The asphericity coefficient
Determined by the face shape of cornea, can be drawn by corneal topography or other conventional detection means）, Q value sizes -1.0~1.0,
A4、A6、A8、A10Can be zero or be not zero, this depends on requirement of the designer to form accuracy.X is any point on the curve
Away from the vertical range of axis of ordinates Y, asphericity coefficient is adjusted, make lens orientation segmental arc face shape and cornea in the face shape one in the region
Cause.The positioning arc area of the Ortho-K inner surface carries out rotationally symmetrical change by the curve negotiating around axis of ordinates Y
And obtain.
But for those skilled in the art, if aspheric design is in eyeglass inner surface, eyeglass is in cornea
On it is eccentric be likely to result in the bad moulding of cornea with inclining, the bad optical effect of generation, and aspheric design is in eyeglass
Preceding surface does not interfere with the moulding of cornea then completely, and only the optical quality to moulding mirror brings beneficial effect.Therefore, selectively
Or preferably, the light school district outer surface of Ortho-K of the present invention uses aspheric design, particularly high order aspheric surface to design,
It is intended to eliminate the spherical aberration of eyeglass, improves lens optical qualities, and effectively improve the image quality after human eye lenses fitted.Certainly,
Those skilled in the art is appreciated that：In order to realize specific optics purpose, the outer surface of Ortho-K of the invention
It can also be the face shape of the multi-focal-plane for including sphere, complex loop curved surface, the multi-focal-plane of multi-region refractive design and multi-region diffractive designs
One kind in.
For example, the outer surface face shape of Ortho-K according to an embodiment of the invention is to make the Ortho-K
Spherical aberration of the eyeglass under 6mm apertures be zero high order aspheric surface.Culminating point with the outer surface of the Ortho-K is
Origin sets up two-dimensional coordinate system ZR（Not shown in figure）, it is described two with tangent with outer surface straight line at the origin
The axis of abscissas Z of dimension coordinate system；To be axis of ordinates R, the high order by the origin, perpendicular to the straight line of axis of abscissas Z
The aspherical curve on the two-dimensional coordinate system plane ZR meets relationship below：
Wherein, c is the surface curvature of the outer surface basis sphere of the Ortho-K（That is the inverse of radius of curvature）, Q,
A4、A6、A8、A10It is the asphericity coefficient of the Ortho-K（The asphericity coefficient is wanted by the Ortho-K eyeglass
The spherical aberration of target zero of realization is determined）.R is vertical range of any point away from axis of abscissas Z on the curve, and regulation changes non-
Asphere coefficient, makes spherical aberration of the eyeglass under 6mm apertures be zero.
The outer surface of the Ortho-K is carried out rotationally symmetrical change by the curve negotiating and is obtained around axis of ordinates R
Arrive.
The outer surface of Ortho-K of the invention see the table below 2, wherein sphere spherical aberration for the design example of high order aspheric surface
One column refers to existing design（It is provided without aspherical）The spherical aberration of eyeglass remaining.
The eyeglass outer surface of the Ortho-K of the invention of table 2 is the design instance data of high order aspheric surface
| Sequence number | Sphere spherical aberration μm | Present invention design spherical aberration | A4 | A6 | A8 | A10 |
| 1 | 0.015 | 0 | 1.528041E-05 | -2.050982E-06 | -1.533445E-07 | 2.157356E-08 |
| 2 | 0.011 | 0 | 1.117026E-05 | -1.373075E-06 | -1.460832E-07 | 1.800707E-08 |
| 3 | 0.002 | 0 | 3.112008E-06 | -5.906222E-07 | 1.813115E-08 | 1.164797E-09 |
| 4 | 0.019 | 0 | 2.228326E-05 | -3.279484E-06 | -1.216079E-07 | 2.439671E-08 |
| 5 | 0.014 | 0 | 1.481499E-05 | -2.119299E-06 | -1.164147E-07 | 1.885790E-08 |
| 6 | 0.003 | 0 | 4.389367E-06 | -5.986359E-07 | -2.990403E-08 | 5.103727E-09 |
| 7 | 0.023 | 0 | 2.732595E-05 | -3.548425E-06 | -2.618622E-07 | 3.686374E-08 |
| 8 | 0.018 | 0 | 1.857113E-05 | -2.655680E-06 | -1.456848E-07 | 2.352607E-08 |
| 9 | 0.004 | 0 | 1.001356E-05 | -2.925773E-06 | 3.286235E-07 | -1.371375E-08 |
Cornea K values, decreasing concentration and front and rear surfaces radius of curvature corresponding to the eyeglass of sequence number 1-9 see the table below 3.
The corresponding cornea K values of the 1-9 eyeglasses of table 3, decreasing concentration and front and rear surfaces radius of curvature
| Sequence number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| K values/D | 39.5 | 39.5 | 39.5 | 43.0 | 43.0 | 43.0 | 46.5 | 46.5 | 46.5 |
| Decreasing concentration/D | -0.5 | -3.0 | -6.0 | -0.5 | -3.0 | -6.0 | -0.5 | -3.0 | -6.0 |
| Ra/mm | 8.749 | 9.420 | 10.357 | 8.031 | 8.592 | 9.364 | 7.422 | 7.899 | 8.545 |
| Rp/mm | 8.766 | 9.441 | 10.305 | 8.036 | 8.599 | 9.310 | 7.418 | 7.895 | 8.491 |
Ortho-K of the invention can control the difference of the refractive power for inverting arc and base curve in a value for stabilization, so that
Ensure tear storage area capacity stabilization, it is ensured that the security and validity of lens wear；Improve eyeglass match arc area and cornea
The matching degree of shape, and arc area linking hop count is reduced, improve surface smoothness；Vision matter when patient wears can be improved simultaneously
Amount.
Embodiment described above is exemplary only and nonrestrictive.Therefore, do not depart from it is disclosed herein
Inventive concept in the case of, those skilled in the art can modify or change to above-described embodiment.Therefore, the present invention
Protection domain only limited by the scope of the appended claims.
Claims (3)
1. a kind of Ortho-K,
Two-dimensional coordinate system XY is set up by origin of the culminating point of the inner surface of the Ortho-K, the Ortho-K
Inner surface is outwardly continuously set from the origin：Base curve area including base curve segmental arc, including invert arc segmental arc reversion arc area,
Positioning arc area including positioning arc segmental arc and circumference arc area including circumference arc segmental arc, with the origin with the base curve arc
The tangent straight line of section is the axis of abscissas X of the two-dimensional coordinate system, with by the origin, perpendicular to axis of abscissas X and be located at
The straight line in plane be made up of with the base curve segmental arc axis of abscissas X is axis of ordinates Y,
Curve of the inner surface of the Ortho-K on the two-dimensional coordinate system X/Y plane is symmetrical on axis of ordinates Y,
In the two-dimensional coordinate system, base curve segmental arc is with the connection point coordinates of reversion arc segmental arc（a1, b1）, reversion arc segmental arc with
Positioning the connection point coordinates of arc segmental arc is（a2, b2）, inverting the central coordinate of circle of the basic spherical arc of arc segmental arc is（X, y）,
The inner surface of the Ortho-K is by the curve negotiating around axis of ordinates（Y）Carry out rotationally symmetrical change and obtain
Arrive,
Characterized in that,
Y is not zero；And
The central coordinate of circle of the basic spherical arc of the reversion arc segmental arc（X, y）Meet relationship below：
Wherein R is the radius of curvature of the basic sphere in the reversion arc area, and
The center of circle of the basic spherical arc of reversion arc segmental arc in the center of circle of the basic spherical arc of base curve segmental arc and does not position arc segmental arc
On the line in the center of circle of basic spherical arc.
2. Ortho-K according to claim 1, it is characterised in that the reversion arc segmental arc be one section of sphere segmental arc or
Person is one section of aspherical segmental arc.
3. Ortho-K according to claim 1, it is characterised in that the radius of curvature of the base curve segmental arc is 7.50-
9.93 millimeters, the reversion arc segmental arc is one constant in the range of 3D-15D relative to the additional optical focal power of the base curve segmental arc
Value, the scope of the radius of curvature of the basic spherical arc of the reversion arc segmental arc is 5.95-9.29 millimeters.
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| WO2017016440A1 (en) | 2015-07-24 | 2017-02-02 | 爱博诺德（北京）医疗科技有限公司 | Vision correction lenses and preparation method therefor |
| CN106707542B (en) * | 2015-07-24 | 2020-02-07 | 爱博诺德(北京)医疗科技股份有限公司 | Externally worn eyesight correction glasses |
| CN107632410A (en) * | 2016-07-19 | 2018-01-26 | 上海根植企业管理咨询有限公司 | A kind of Ortho-K tries the combined method of piece on |
| SG11201811411UA (en) * | 2016-10-31 | 2019-01-30 | Toray Industries | Orthokeratology lens |
| CN108681100B (en) * | 2018-05-17 | 2020-01-07 | 珠海艾格医疗科技开发有限公司 | Method for manufacturing cornea shaping mirror |
| CN108646436A (en) * | 2018-07-30 | 2018-10-12 | 王江桥 | A kind of cornea K values superelevation or ultralow Ortho-K and its design method |
| CN113934016B (en) * | 2021-08-24 | 2024-04-16 | 天津世纪康泰生物医学工程有限公司 | Cornea shaping mirror based on artificial intelligence optimization algorithm |
| CN116088199A (en) * | 2022-12-02 | 2023-05-09 | 上海杰视医疗科技有限公司 | Cornea shaping mirror |
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| US7004584B1 (en) * | 2000-10-05 | 2006-02-28 | Crt Technology, Inc. | Contact lens and methods of manufacture |
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| WO2010099102A1 (en) * | 2009-02-27 | 2010-09-02 | Euclid Systems Corporation | Orthokeratology lens wear combined with chemical treatment to correct myopia, hyperopia or astigmatism |
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| CN1177243C (en) * | 2000-06-27 | 2004-11-24 | 佳视科学公司 | Contact lens, its mfg. and prepn. method and computer programmed products |
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