CN203745737U - Orthokeratology (ortho-K) lens - Google Patents
Orthokeratology (ortho-K) lens Download PDFInfo
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- CN203745737U CN203745737U CN201420052215.3U CN201420052215U CN203745737U CN 203745737 U CN203745737 U CN 203745737U CN 201420052215 U CN201420052215 U CN 201420052215U CN 203745737 U CN203745737 U CN 203745737U
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- 210000004087 cornea Anatomy 0.000 claims abstract description 46
- 230000003287 optical effect Effects 0.000 claims description 19
- 230000004075 alteration Effects 0.000 claims description 16
- 238000003860 storage Methods 0.000 abstract description 9
- 230000002093 peripheral effect Effects 0.000 abstract description 5
- 230000000007 visual effect Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000000465 moulding Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 9
- 238000005259 measurement Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 238000005304 joining Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000203 mixture Substances 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
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000004397 blinking Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 210000002068 epithelial cell of cornea Anatomy 0.000 description 1
- 210000005081 epithelial layer Anatomy 0.000 description 1
- 210000000744 eyelid Anatomy 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005226 mechanical processes and functions Effects 0.000 description 1
- 230000000399 orthopedic effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 210000001525 retina Anatomy 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model relates to an orthokeratology (ortho-K) lens. The ortho-K lens is characterized in that a base curve area, reverse curve areas, positioning curve areas and peripheral curve areas are continuously arranged on the inner surface of the ortho-K lens from the center to the outside, wherein the positioning curve areas on the inner surface of the ortho-K lens are aspheric surfaces matched with the cornea in shape. The ortho-K lens has the beneficial effects that the matching degrees of lens matching curve areas and the cornea in shape can be enhanced, the number of curve area joint segments is reduced, and the surface smoothness is improved; the difference of refractive powers of the reverse curves and the base curve is controlled to be a stable value, thus ensuring stable capacity of a tear storage space; the ortho-K lens ensures the safety and effectiveness of wearing; meanwhile, the visual quality of a patient wearing the ortho-K lens is improved.
Description
Technical field
The utility model relates generally to the design field of an optometry.Particularly, the utility model relates to a kind of Ortho-K with brand-new design.
Background technology
Ortho-k (Orthokeratology(Ortho-K)) be by specially designed Ortho-K initiatively, in steps, progressive, scientifically change cornea configuration, to improve fast UCVA, control adolescent myopia develops into a special kind of skill of target.
Modern Ortho-K adopts " reversing how much " design concept, the inner surface configuration of Ortho-K is designed to contrary with anterior surface of cornea geometric configuration, manufactures some gaps between eyeglass and cornea, " orthopedic " effect of utilizing the mechanical function of tear to reach.Ortho-K is rigid glasses, wears between rear eyeglass inside surface and cornea outside surface and clips one deck tear pockety, and the fluid mechanics effect of tear is drawn the epithelial cell of cornea central authorities to middle perimembranous (periphery); Meanwhile, when closing one's eyes and blinking, the effect of eyelid makes eyeglass central authorities impose certain pressure to below cornea.These two kinds of effects cause cornea central authorities curvature to flatten, central epithelial layer attenuation, and middle perimembranous thickening, moves to close retina direction depending on thing imaging point.Wear after a period of time, it is consistent with Ortho-K rear surface that anterior surface of cornea shape is tending towards, and when extracing the moulding rigid air-permeable contact lense of using of cornea, cornea still keeps the shape of Ortho-K rear surface, eliminates thereby myopia degree is reduced even.The change of this shape is short-term, and when stopping wearing after Ortho-K, cornea can be got back to former form.
" reversing how much " design of Ortho-K was proposed (US 4952045) in 1989 by Stoyan, Ortho-K is divided into San Gehu district by initial reversion geometry designs, comprise base arc, reversion arc and circumference arc, because the reversion arc of this design is very wide, edge perk is highly larger, easily cause the random movement of eyeglass, there is clinically larger limitation.The Ortho-K of modern " reversing how much " design improves reversion geometric areas, is generally divided into four regions.Fig. 1 is longitudinal center's diagrammatic cross-section of the prior art Ortho-K of inside surface Wei Sihu district design.As shown in fig. 1, Ji Hu district 1 contacts the middle section of eye cornea, and face shape is comparatively smooth, for flattening anterior corneal surface; Reversion arc district 2 is comparatively precipitous, for the pressing effect of firm base arc, and ensures certain tear storage capacity; Arc district 3, location also can be called Pei Shihu district, is mainly used in stabilized lenses; Zhou Hu district 4 ensures the circulation of cornea and Ortho-K periphery tear.
The inside surface of Ortho-K is moulding function feasible region, and most design is carried out for this region, and method is for the radius-of-curvature in Si Gehu district and two variablees of width, designs respectively according to patient's cornea shape and dioptric requirement.
The design that is widely used at present producing generally adopts 4-7 circular arc dovetail individual or 5-7 different curvature radius to form, and the curved surface of each segmental arc is sphere.Fig. 2 is another longitudinal center's diagrammatic cross-section of prior art Ortho-K, clearly show that the design feature of prior art Ortho-K in this figure.As shown in Figure 2, Si Hu district is the most basic design, and Si Gehu district adopts the sphere of four different radius-of-curvature, and the centre of sphere of the each sphere (centre of sphere O of Ji Jihu district 1 sphere
1, reversion arc district 2 spheres centre of sphere O
2, location arc district 3 spheres centre of sphere O
3) conllinear, i.e. on the Y of same axis (as patent CN 1256908A, described in US 005963297A), Ge Hu district joining place carries out chamfering, and each segmental arc is connected naturally.5-7 circular arc dovetail refers at reversion arc and locates multiple circular arcs for arc (as reversion arc comprises two sections of circular arcs, location arc comprises three sections of circular arcs), so that base arc is connected easier with reversion arc, and make to locate arc and more mate (because cornea is aspheric surface, adopting multiple spheres to simulate the form of " aspheric surface ") with cornea shape.At present product information on the market not yet shows without any a Ortho-K and has adopted aspheric design.
No matter the design of Ortho-K inside surface how, current Ortho-K outside surface all adopts simple sphere, in order to reach correct dioptric.
But mainly there is defect and deficiency in the Ortho-K of prior art:
(1) design of the reversion arc of the Ortho-K of prior art adopts with base arc, locates the circular arc of the arc center of circle at same center line, the two is linked up smoothly naturally, the shortcoming of this design is, refractive power between reversion arc and base arc is poor unstable, the large 3-15D in refractive power Bi Jihu district in the existing moulding mirror reversion arc district of open report, in fact difference is far longer than this span of 3-15D possibly, cause tear storage area capacity unstable, the moulding effect of moulding mirror of difference degree of falling is also unstable, reduces result for the treatment of.
(2) Ortho-K of prior art is placed on most energy in the design on inside surface, makes every effort to that Ortho-K is worn more comfortable on design direction, reaches better moulding effect, and does not consider the improvement of Ortho-K optical property.Ortho-K is generally and wears type night, although in most cases without playing the thing effect of looking, but in special circumstances, as got up in the night to urinate evening, drink water, answer the door etc., wearer need to look thing, and this situation is scotopia condition at night substantially, human eye pupil is larger, in the optical system of Ortho-K and human eye composition, the Optical Region that Ortho-K works is also larger, can reach 6mm even larger.All does not limit spherical aberration existing Ortho-K Optical Region, and under large clear aperature, Ortho-K brings extra spherical aberration can to the optical system of Ortho-K and human eye composition, affects wearer's visual quality.
Adopt aspheric surface can effectively limit the spherical aberration size of optical lens in Optical Region, the existing Ortho-K product overwhelming majority adopts two sphere designs in Optical Region.Also there is the design that adopts as previously mentioned " aspheric surface " that simulate on the inside surface of Ortho-K product, but its objective is in order to make the shape of cornea after moulding become the shape of Ortho-K inside surface, be not intended to improve the optical quality of patient Dai Jingshi.And " aspheric surface " design simulating is placed on to the inside surface of Ortho-K, if eyeglass is run-off the straight or bias in the time wearing, anterior surface of cornea will be shaped as and the shape of opthalmic optics's system decentraction, cause patient to produce the phenomenon such as halation, dazzle, have a strong impact on the opthalmic optics's quality after moulding.Aspheric surface run-off the straight and when eccentric on the visible patent CN2013/000057(PCT number of patent application of the impact of system optics mass formation).
(3) cornea is non-sphere form, directly contacts with anterior corneal surface for the arc district, location of stabilized lenses, and therefore needing has very high matching degree with cornea, and reduces the position that needs chamfering to be connected as far as possible, prevents that rough inner surface from causing the phenomenon of cornea discomfort.Arc district, existing location adopts the circular arc dovetail analog cornea peripheral shape of several different curvature radius, and the joining place of each circular arc is unsmooth and need many places chamfering, and can not mate completely with cornea peripheral shape.
Utility model content
The utility model proposes in view of existing the problems referred to above in prior art.Inventor is by adopting innovatively aspherical mirror machining technique, the aspheric surface matching with cornea shape is processed into in the arc district, location of Ortho-K inside surface, and selectively on the outside surface of described Ortho-K, apply brand-new optical design, its object is to improve the matching degree of eyeglass match arc district and cornea shape, and reduce arc district linking hop count, improve surface smoothness; The difference of the refractive power of control reversion arc and base arc is a stable value, thereby guarantee tear storage area capacity is stable, ensures security and the validity of lens wear; Visual quality while simultaneously improving patient wear.
Term definition
The term " inside surface of Ortho-K " using in this application refers to that surface of the Ortho-K directly contacting with eye cornea while wearing.
The term " outside surface of Ortho-K " using in this application refers to that surface relative with the inside surface of Ortho-K.
The term " base arc segmental arc " using in this application refers to Ji Huqu and sets up at the culminating point of the inside surface with Ortho-K the segmental arc that in two-dimensional coordinate system XY plane, (on the longitudinal center's section at Ortho-K) presented for initial point.
The term " reversion arc segmental arc " using in this application refers to reversion arc district and sets up at the culminating point of the inside surface with Ortho-K the segmental arc that in two-dimensional coordinate system XY plane, (on the longitudinal center's section at Ortho-K) presented for initial point.
The term " location arc segmental arc " using in this application refers to arc district, location and sets up at the culminating point of the inside surface with Ortho-K the segmental arc that in two-dimensional coordinate system XY plane, (on the longitudinal center's section at Ortho-K) presented for initial point.
The term " circumference arc segmental arc " using in this application refers to circumference arc district and sets up at the culminating point of the inside surface with Ortho-K the segmental arc that in two-dimensional coordinate system XY plane, (on the longitudinal center's section at Ortho-K) presented for initial point.
Such as, in the time that the inside surface/outside surface of Ortho-K of the present utility model adopts aspheric surface (high order aspheric surface, complex loop curved surface etc.) design, this can be regarded as increasing aspheric surface (for example high order aspheric surface, complex loop curved surface) design on the imaginary basic sphere of the inside surface/outside surface of Ortho-K.For example, if the specific arc district on the inside surface/outside surface of Ortho-K adopts sphere design, it is identical to liking that so so-called its basic sphere refers to this sphere.Therefore, the term " basic spherical arc " using in this application refers to the segmental arc comprising in (correspondence) imaginary basic sphere of inside surface/outside surface of Ortho-K, for example, as shown in Fig. 1,4,7.
Particularly, the utility model relates to the content of following many aspects:
1. an Ortho-K, the inside surface of described Ortho-K outwards arranges continuously from center: comprise base arc segmental arc Ji Hu district, comprise reversion arc segmental arc reversion arc district, comprise the arc district, location of location arc segmental arc and comprise the circumference arc district of circumference arc segmental arc, it is characterized in that, the arc district, location of described Ortho-K inside surface is the aspheric surface matching with cornea shape.
2. according to the Ortho-K described in aspect 1, it is characterized in that,
Set up two-dimensional coordinate system XY taking the culminating point of the inside surface of described Ortho-K as initial point, taking the abscissa axis X as described two-dimensional coordinate system at described initial point place and the tangent straight line of described base arc segmental arc, taking through described initial point, perpendicular to abscissa axis X and the straight line that is positioned at the plane being formed by abscissa axis X and described base arc segmental arc as axis of ordinates Y
The curve of the inside surface of described Ortho-K on described two-dimensional coordinate system plane X Y be about axis of ordinates Y symmetry,
In described two-dimensional coordinate system, base arc segmental arc is (a with the tie point coordinate of reversion arc segmental arc
1, b
1), reversion arc segmental arc is (a with the tie point coordinate of location arc segmental arc
2, b
2), the central coordinate of circle of the basic spherical arc of reversion arc segmental arc is (x, y),
The inside surface of described Ortho-K is rotated symmetrical variation and obtains around axis of ordinates (Y) by described curve negotiating,
It is characterized in that,
Y is non-vanishing; And
The central coordinate of circle (x, y) of the basic spherical arc of described reversion arc segmental arc meets following relational expression:
Wherein R is the radius-of-curvature of the basic sphere in described reversion arc district.
3. according to the Ortho-K described in aspect 2, it is characterized in that, described reversion arc segmental arc is one section of sphere segmental arc or one section of aspheric surface segmental arc.
4. according to the Ortho-K described in aspect 1, it is characterized in that, the radius-of-curvature of described base arc segmental arc is 7.50-9.93 millimeter, described reversion arc segmental arc is the steady state value within the scope of 3D-15D with respect to the additional optical focal power of described base arc segmental arc, and the scope of the radius-of-curvature of the basic spherical arc of described reversion arc segmental arc is 5.95-9.29 millimeter.
5. according to the Ortho-K described in any one in aforementioned aspect 1-4, it is characterized in that, the outside surface of described Ortho-K is the one comprising in the face shape of multifocal of sphere, aspheric surface, complex loop curved surface, multi-region refractive design multifocal and multi-region diffractive designs.
6. according to the Ortho-K described in aspect 5, it is characterized in that, the lens thickness of described Ortho-K is in the scope of 0.18-0.25 millimeter.
7. according to the Ortho-K described in aspect 5, it is characterized in that, the outside surface face shape of described Ortho-K is the high order aspheric surface that the spherical aberration of eyeglass under 6mm aperture that make described Ortho-K is zero.
8. according to the Ortho-K described in aspect 7, it is characterized in that,
Set up two-dimensional coordinate system ZR taking the culminating point of the outside surface of described Ortho-K as initial point, taking the abscissa axis Z as described two-dimensional coordinate system at described initial point place and the tangent straight line of described outside surface; Taking through described initial point, perpendicular to the straight line of abscissa axis Z as axis of ordinates R,
The curve of described high order aspheric surface on described two-dimensional coordinate system plane ZR meets following relational expression:
Wherein, the surface curvature of the outside surface basis sphere that c is described Ortho-K, Q, A
4, A
6, A
8, A
10for asphericity coefficient, r be on described curve any point apart from the vertical range of abscissa axis Z,
The outside surface of described Ortho-K is rotated symmetrical variation and obtains around axis of ordinates R by described curve negotiating.
The technical solution of the utility model has following beneficial effect especially:
Novel Ortho-K of the present utility model can improve the matching degree of eyeglass match arc district and cornea shape, and reduces arc district linking hop count, improves surface smoothness; The difference of the refractive power of control reversion arc and base arc is a stable value, thereby guarantee tear storage area capacity is stable; Ensure security and the validity of lens wear; Visual quality can improve patient wear time simultaneously.
Brief description of the drawings
According to following accompanying drawing and explanation, feature of the present utility model, advantage will become more clear, wherein:
Fig. 1 is longitudinal center's diagrammatic cross-section of the prior art Ortho-K of inside surface Wei Sihu district design;
Fig. 2 is another longitudinal center's diagrammatic cross-section of prior art Ortho-K, clearly show that the design feature of prior art Ortho-K in this figure;
Fig. 3 is according to longitudinal center's diagrammatic cross-section of the Ortho-K product of an embodiment of the present utility model;
Fig. 4 is another longitudinal center's diagrammatic cross-section according to the Ortho-K of an embodiment of the present utility model, clearly show that the design feature of the utility model Ortho-K in this figure;
Fig. 5 is the contrast MTF figure that adopts the eyeglass (front and rear surfaces is sphere) of the Ortho-K of prior art design.In figure, dotted line is diffraction limit, is the best MTF of optics that eyeglass can reach; In figure, solid line is the MTF curve that actual measurement obtains;
Fig. 6 is the contrast MTF figure that adopts the eyeglass of the Ortho-K of design of the present utility model.In figure, dotted line is diffraction limit, is the best MTF of optics that eyeglass can reach; In figure, solid line is the MTF curve that actual measurement obtains.
Fig. 7 is the longitudinal center's diagrammatic cross-section according to the Ortho-K of another embodiment of the present utility model, shows especially the location arc design feature of the utility model Ortho-K in this figure.
In the application's accompanying drawing, use identical drawing reference numeral to represent same or analogous element.
Drawing reference numeral explanation
1 Ji Huqu (base arc segmental arc)
2 reversion arc districts (reversion arc segmental arc)
3 arc district, location (location arc segmental arc)
4 circumference arc districts (circumference arc segmental arc)
5 corneas
The culminating point of the inside surface of O Ortho-K
O
1the center of circle of the basic spherical arc of base arc segmental arc
O
2the center of circle of the basic spherical arc of reversion arc segmental arc
O
3the center of circle of the basic spherical arc of location arc segmental arc
A
1the tie point of base arc segmental arc and reversion arc segmental arc, its coordinate is (a
1, b
1)
A
2reversion arc segmental arc and the tie point of locating arc segmental arc, its coordinate is (a
2, b
2).
Embodiment
Following specific embodiment is just for the utility model is explained further, but the utility model is not limited to following specific embodiments.Any variation on these embodiment bases, as long as meet spirit of the present utility model and scope, all will fall in the covering scope of the utility model patent.
The lens thickness of Ortho-K of the present utility model is roughly in the scope of 0.18-0.25 millimeter.Ji Huqu is the lens optical district of Ortho-K, and its diameter for example, according to wearer's pupil size scope 5.5-7.0 millimeter (6.0 millimeters) design, and radius-of-curvature 7.50-9.93 millimeter, adopts zero aberration sphere design or the design of zero aberration aspheric surface.
Fig. 3 is the longitudinal center's diagrammatic cross-section according to the Ortho-K of an embodiment of the present utility model.Fig. 4 is another longitudinal center's diagrammatic cross-section according to the Ortho-K of an embodiment of the present utility model, clearly show that the design feature of the utility model Ortho-K in this figure.
Set up two-dimensional coordinate system XY taking the culminating point O of the inside surface of described Ortho-K as initial point, the inside surface of Ortho-K as shown in Figures 3 and 4 outwards arranges continuously from described initial point: comprise base arc segmental arc Ji Hu district 1, comprise the reversion arc district 2 of reversion arc segmental arc, comprise the arc district, location 3 and the circumference arc district 4 that comprises circumference arc segmental arc of location arc segmental arc, taking the abscissa axis X as described two-dimensional coordinate system at described initial point place and the tangent straight line of described base arc segmental arc, with the described initial point of process, be axis of ordinates Y perpendicular to abscissa axis X and the straight line that is positioned at the plane being formed by abscissa axis X and described base arc segmental arc.This lens thickness is 0.20 millimeter.
As shown in Figure 4, the curve of the inside surface of described Ortho-K on described two-dimensional coordinate system plane X Y is about axis of ordinates Y symmetry.
In described two-dimensional coordinate system, the tie point A of base arc segmental arc and reversion arc segmental arc
1coordinate be (a
1, b
1), reversion arc segmental arc and the tie point A that locates arc segmental arc
2coordinate be (a
2, b
2), the center of circle O of the basic spherical arc of reversion arc segmental arc
2coordinate is (x, y), and wherein y is non-vanishing, and this that is to say, the center of circle O of the basic spherical arc of reversion arc segmental arc
2not at the center of circle O of the basic spherical arc of base arc segmental arc
1center of circle O with the basic spherical arc of location arc segmental arc
3line on, the advantage of this design is, can control the difference of refractive power of reversion arc and base arc a stable value, thereby ensure that tear storage area capacity is stable, security and the validity (the tear storage capacity of Ortho-K directly determines moulding effect) of guarantee lens wear.And the central coordinate of circle (x, y) of the basic spherical arc of described reversion arc segmental arc meets following relational expression (1):
(1)
Wherein R is the radius-of-curvature of the basic sphere in described reversion arc district.
The inside surface of described Ortho-K is rotated symmetrical variation and obtains around axis of ordinates Y by described curve negotiating.
In this embodiment, described reversion arc segmental arc is one section of sphere segmental arc.But for those skilled in the art, described reversion arc segmental arc can be also one section of aspheric surface segmental arc.According to design of the present utility model, the radius-of-curvature of described base arc segmental arc is 7.50-9.93 millimeter, described reversion arc segmental arc is the steady state value within the scope of 3D-15D with respect to the additional optical focal power of described base arc segmental arc, and the scope of the radius-of-curvature of the basic spherical arc of described reversion arc segmental arc is 5.95-9.29 millimeter.
The design example of the inside surface of Ortho-K of the present utility model sees the following form 1, and wherein n is the refraction index of moulding mirror material, and D is additional diopter, R Wei Jihu district radius-of-curvature, and R ' is reversion arc district radius-of-curvature.Addition power is larger, and tear storage space is larger.
The design example (unit: mm) of the inside surface of table 1 Ortho-K of the present utility model
| 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 contrast MTF figure that adopts the eyeglass (front and rear surfaces is sphere) of the Ortho-K of prior art design.In figure, dotted line is diffraction limit, is the best MTF of optics that eyeglass can reach; In figure, solid line is the MTF curve that actual measurement obtains.Fig. 6 is the contrast MTF figure that adopts the eyeglass of the Ortho-K of design of the present utility model, and in figure, curve is A diffraction limit, is the best MTF of optics that eyeglass can reach; In figure, solid line is the MTF curve that actual measurement obtains.
MTF the most comprehensively evaluates lens optical image quality.Fig. 5 is the MTF figure that adopts the eyeglass of existing design (front and rear surfaces is sphere), the MTF of Fig. 6 the utility model gained eyeglass, and the dotted line in figure is diffraction limit, is the best MTF of optics that eyeglass can reach.As we can see from the figure, adopt the eyeglass MTF(of existing design referring to the solid line in Fig. 5) from diffraction limit (referring to the dotted line in Fig. 5, optimal imaging quality) still there is certain gap, and after adopting design of the present utility model, eyeglass spherical aberration is eliminated, the MTF of eyeglass overlaps with the desired diffractive limit (referring to the dotted line in Fig. 6 and solid line), has improved lens imaging quality.
Fig. 7 is the longitudinal center's diagrammatic cross-section according to the Ortho-K of another embodiment of the present utility model, shows especially the location arc design feature of the utility model Ortho-K in this figure.
As known to persons skilled in the art, the Ortho-K of prior art adopts sphere processing technology to manufacture, can only cut the circular arc of certain curvature radius in a certain segmental arc, can not cut the segmental arc (being aspheric surface) that radius-of-curvature generation continuity changes, therefore existing moulding mirror is in the time of design, adopt the circular arc dovetail analog cornea peripheral shape of several different curvature radius, circular arc can be two, also can be multiple, joining place is unsmooth and need many places chamfering, and can not mate completely with cornea peripheral shape.
Because cornea is aspheric and because the arc district, location for stablizing Ortho-K eyeglass directly contacts with anterior corneal surface, therefore as shown in Figure 7, adopt in arc district, location 3 design matching with cornea shape according to the inside surface of the Ortho-K of an embodiment of the present utility model, in full accord with cornea 5 shapes, and location segmental arc 3 and reversion arc segmental arc 2 and 4 smooth connections of circumference arc segmental arc, and then reduce the position that needs chamfering to be connected in arc district, location as far as possible, prevent that Ortho-K rough inner surface from causing the phenomenon of cornea discomfort.The utility model adopts aspherical mirror machining technique, utilize machining tool in the characteristic axial and variation of radially equal high resolving power continuously, machined surface shape continually varying aspheric surface, it is being mated with cornea face shape in shape completely, can select aspheric surface parameter according to the shape of individual cornea, carry out personalized design.The aspheric surface that this processing mode obtains is smooth without chamfering.
According to a preferred embodiment of the present utility model, the face shape in the arc district, location of Ortho-K eyeglass inside surface of the present utility model is high order aspheric surface.Set up two-dimensional coordinate system XY(Fig. 4 taking the culminating point O of described Ortho-K inside surface as initial point), taking through described initial point, perpendicular to abscissa axis X and the straight line that is positioned at the plane being formed by abscissa axis X and described base arc segmental arc as axis of ordinates Y, the curve of described high order aspheric surface on described two-dimensional coordinate system plane X Y meets following relational expression:
Wherein, c is the surface curvature (being the inverse of radius-of-curvature) of basis, arc district, the location sphere of described Ortho-K inside surface, Q, A
4, A
6, A
8, A
10for the asphericity coefficient (described asphericity coefficient is decided by the face shape of cornea, can be drawn by corneal topography or other conventional sense means) in the arc district, location of described Ortho-K inside surface, Q value size is at-1.0～1.0, A
4, A
6, A
8, A
10can be zero or non-vanishing, this depends on the requirement of deviser to form accuracy.X is that on described curve, any point, apart from the vertical range of axis of ordinates Y, regulates asphericity coefficient, makes lens orientation segmental arc face shape consistent the face shape in this region with cornea.The arc district, location of described Ortho-K inside surface is rotated symmetrical variation and obtains around axis of ordinates Y by described curve negotiating.
But for those skilled in the art, if aspheric surface designs at eyeglass inside surface, the bias of eyeglass on cornea may cause the bad moulding of cornea with inclination, produce bad optical effect, aspheric surface design can not affect the moulding of cornea completely in lens front surface, brings beneficial effect only to the optical quality of moulding mirror.Therefore, selectively or preferably, the Optical Region outside surface of the utility model Ortho-K adopts aspheric surface design, particularly high order aspheric surface design, be intended to eliminate the spherical aberration of eyeglass, improve lens optical quality, and effectively improve the image quality after human eye lenses fitted.Certainly, those skilled in the art is understood that in order to realize specific optics object, and the outside surface of Ortho-K of the present utility model can be also the one comprising in sphere, complex loop curved surface, multifocal of multi-region refractive design and the face shape of multifocal of multi-region diffractive designs etc.
For example, be the high order aspheric surface that the spherical aberration of eyeglass under 6mm aperture that make described Ortho-K is zero according to the outside surface face shape of the Ortho-K of an embodiment of the present utility model.Set up two-dimensional coordinate system ZR(taking the culminating point of the outside surface of described Ortho-K as initial point not shown), taking the abscissa axis Z as described two-dimensional coordinate system at described initial point place and the tangent straight line of described outside surface; Taking through described initial point, perpendicular to the straight line of abscissa axis Z as axis of ordinates R, the curve of described high order aspheric surface on described two-dimensional coordinate system plane ZR meets following relational expression:
Wherein, the surface curvature (being the inverse of radius-of-curvature) of the outside surface basis sphere that c is described Ortho-K, Q, A
4, A
6, A
8, A
10for the asphericity coefficient of described Ortho-K (described asphericity coefficient will be realized by described Ortho-K eyeglass target zero spherical aberration decide).R is that on described curve, any point, apart from the vertical range of abscissa axis Z, regulates and changes asphericity coefficient, and making the spherical aberration of eyeglass under 6mm aperture is zero.
The outside surface of described Ortho-K is rotated symmetrical variation and obtains around axis of ordinates R by described curve negotiating.
The outside surface of Ortho-K of the present utility model is that the design example of high order aspheric surface sees the following form 2, and wherein sphere spherical aberration one hurdle refers to the remaining spherical aberration of existing design (not adopting aspheric surface) eyeglass.
The design example data that the eyeglass outside surface of table 2 Ortho-K of the present utility model is high order aspheric surface
| Sequence number | Sphere spherical aberration μ m | The utility model 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 |
The corresponding cornea K of eyeglass value, degree of falling and the front and rear surfaces radius-of-curvature of sequence number 1-9 see the following form 3.
Cornea K value, degree of falling and front and rear surfaces radius-of-curvature that table 3 1-9 eyeglass is corresponding
| Sequence number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| K value/D | 39.5 | 39.5 | 39.5 | 43.0 | 43.0 | 43.0 | 46.5 | 46.5 | 46.5 |
| Degree of falling/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 present utility model can improve the matching degree of eyeglass match arc district and cornea shape, and reduces arc district linking hop count, improves surface smoothness; The difference of the refractive power of control reversion arc and base arc is a stable value, thereby guarantee tear storage area capacity is stable; Ensure security and the validity of lens wear; Visual quality can improve patient wear time simultaneously.
Embodiment is above only illustrative rather than restrictive.Therefore,, in the situation that not departing from utility model design disclosed herein, those skilled in the art can modify or change above-described embodiment.Therefore, protection domain of the present utility model is only limited by the scope of appended claims.
Claims (8)
1. an Ortho-K, the inside surface of described Ortho-K outwards arranges continuously from center: comprise base arc segmental arc Ji Hu district, comprise reversion arc segmental arc reversion arc district, comprise the arc district, location of location arc segmental arc and comprise the circumference arc district of circumference arc segmental arc, it is characterized in that, the arc district, location of described Ortho-K inside surface is the aspheric surface matching with cornea shape.
2. Ortho-K according to claim 1, is characterized in that,
Set up two-dimensional coordinate system XY taking the culminating point of the inside surface of described Ortho-K as initial point, taking the abscissa axis X as described two-dimensional coordinate system at described initial point place and the tangent straight line of described base arc segmental arc, taking through described initial point, perpendicular to abscissa axis X and the straight line that is positioned at the plane being formed by abscissa axis X and described base arc segmental arc as axis of ordinates Y
The curve of the inside surface of described Ortho-K on described two-dimensional coordinate system plane X Y be about axis of ordinates Y symmetry,
In described two-dimensional coordinate system, base arc segmental arc is (a with the tie point coordinate of reversion arc segmental arc
1, b
1), reversion arc segmental arc is (a with the tie point coordinate of location arc segmental arc
2, b
2), the central coordinate of circle of the basic spherical arc of reversion arc segmental arc is (x, y),
The inside surface of described Ortho-K is rotated symmetrical variation and obtains around axis of ordinates (Y) by described curve negotiating,
It is characterized in that,
Y is non-vanishing; And
The central coordinate of circle (x, y) of the basic spherical arc of described reversion arc segmental arc meets following relational expression:
Wherein R is the radius-of-curvature of the basic sphere in described reversion arc district.
3. Ortho-K according to claim 2, is characterized in that, described reversion arc segmental arc is one section of sphere segmental arc or one section of aspheric surface segmental arc.
4. Ortho-K according to claim 1, it is characterized in that, the radius-of-curvature of described base arc segmental arc is 7.50-9.93 millimeter, described reversion arc segmental arc is the steady state value within the scope of 3D-15D with respect to the additional optical focal power of described base arc segmental arc, and the scope of the radius-of-curvature of the basic spherical arc of described reversion arc segmental arc is 5.95-9.29 millimeter.
5. according to the Ortho-K described in any one in aforementioned claim 1-4, it is characterized in that, the outside surface of described Ortho-K is the one comprising in the face shape of multifocal of sphere, aspheric surface, complex loop curved surface, multi-region refractive design multifocal and multi-region diffractive designs.
6. Ortho-K according to claim 5, is characterized in that, the lens thickness of described Ortho-K is in the scope of 0.18-0.25 millimeter.
7. Ortho-K according to claim 5, is characterized in that, the outside surface face shape of described Ortho-K is the high order aspheric surface that the spherical aberration of eyeglass under 6mm aperture that make described Ortho-K is zero.
8. Ortho-K according to claim 7, is characterized in that,
Set up two-dimensional coordinate system ZR taking the culminating point of the outside surface of described Ortho-K as initial point, taking the abscissa axis Z as described two-dimensional coordinate system at described initial point place and the tangent straight line of described outside surface; Taking through described initial point, perpendicular to the straight line of abscissa axis Z as axis of ordinates R,
The curve of described high order aspheric surface on described two-dimensional coordinate system plane ZR meets following relational expression:
Wherein, the surface curvature of the outside surface basis sphere that c is described Ortho-K, Q, A
4, A
6, A
8, A
10for asphericity coefficient, r be on described curve any point apart from the vertical range of abscissa axis Z,
The outside surface of described Ortho-K is rotated symmetrical variation and obtains around axis of ordinates R by described curve negotiating.
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| CN201420052215.3U CN203745737U (en) | 2014-01-27 | 2014-01-27 | Orthokeratology (ortho-K) lens |
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| CN201420052215.3U CN203745737U (en) | 2014-01-27 | 2014-01-27 | Orthokeratology (ortho-K) lens |
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| CN104808353A (en) * | 2014-01-27 | 2015-07-29 | 爱博诺德（北京）医疗科技有限公司 | Orthokeratology lens |
| CN106291977A (en) * | 2015-07-24 | 2017-01-04 | 爱博诺德（北京）医疗科技有限公司 | A kind of Ortho-K |
| CN106353892A (en) * | 2015-07-24 | 2017-01-25 | 爱博诺德（北京）医疗科技有限公司 | Internal oculoscope |
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| CN108681100A (en) * | 2018-05-17 | 2018-10-19 | 珠海艾格医疗科技开发有限公司 | A kind of design method of Ortho-K |
| CN110515218A (en) * | 2019-09-10 | 2019-11-29 | 欧普康视科技股份有限公司 | A kind of Ortho-K |
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| WO2018166075A1 (en) * | 2017-03-17 | 2018-09-20 | 施伯彦 | Hard corneal contact lens |
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| CN107783314A (en) * | 2017-11-21 | 2018-03-09 | 欧普康视科技股份有限公司 | A kind of Ortho-K and customization piece segmental arc parameter generation method |
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| CN110515218A (en) * | 2019-09-10 | 2019-11-29 | 欧普康视科技股份有限公司 | A kind of Ortho-K |
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