CN208756305U - Ortho-K for presbyopic correction - Google Patents
Ortho-K for presbyopic correction Download PDFInfo
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- CN208756305U CN208756305U CN201721682223.6U CN201721682223U CN208756305U CN 208756305 U CN208756305 U CN 208756305U CN 201721682223 U CN201721682223 U CN 201721682223U CN 208756305 U CN208756305 U CN 208756305U
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Abstract
The Ortho-K that the utility model relates to correct for presbyopic.The Ortho-K includes the inner surface and the outer surface opposite with the inner surface when wearing towards eye cornea.The inner surface includes centrally located circular base curve area.The base curve area has and the consistent shape in base curve area for oppressing anterior surface of cornea and fashioning into anterior surface of cornea.The face shape in the base curve area is aspherical.The face shape in the base curve area of the Ortho-K of the utility model is aspherical, cornea can be made to realize the refractive power of gradual change after moulding, using wearing mirror at night, pluck the wearing mode of mirror daytime, it realizes and ametropia merges correction with presbyopia, it is convenient, beautiful, effective, more meet pursuit of the modern to quality of the life.
Description
Technical field
The Ortho-K that the utility model relates to correct for presbyopic, the face shape for relating more specifically to base curve area is aspheric
The Ortho-K in face.
Background technique
Presbyopia is that people step into the visual problem necessarily occurred after person in middle and old age.With age, eye regulating power is gradually
Decline and regard nearly difficulty so that near work so as to cause patient, it is necessary to separately add convex lens except the correction of its static refraction
Can just there be clearly near vision, this phenomenon is known as presbyopia.With modern people's improvement of living standard, especially like to be beautiful women
To the middle age, they increasingly improve in the requirement to image, it is desirable to oneself keep young state at any time, it is undesirable to stick one's chin out old
Colored state, puzzlement caused by presbyopic problem are increasingly severe.Current presbyopia wears reading glasses, operation, pendant outside mainly passing through
The modes such as multifocal contact lenses are worn to solve.Wear presbyopic glasses outside or contact lenses for wearing in the daytime etc. it is outer wear mode in convenience, rectify
There are problems in terms of plus effect, correction stability, especially outer to wear presbyopic glasses, seriously affect wearer's image.Operation refers mainly to
Cornea implant, or all kinds of multifocal intraocular lenses of implantation, this kind of correction mode be all it is irreversible, human ocular tissues are produced
Raw damage, there is a problem of different degrees of in terms of safety, and the people of this age bracket has generally arrived the cataract high-incidence season,
Subsequent to face other eye treatments, such as cataract operation etc., the mode of operation brings serious puzzlement to subsequent procedures.Therefore
It is badly in need of a kind of hidden, effective, safe presbyopia corrective measure.
Cornea moulding is a kind of using high oxygen flow hardness material with rigid air-permeable type contact lens (abbreviation Ortho-K)
Material is made, by temporarily changing corneal surface shape, to reach the product for temporarily sexually revising ametropic purpose.This is a kind of reversible
Property, Non-surgical correction of refractive errors product, mode that usually night wears (wears mirror sleep, pluck mirror daytime) at night, and wearer wears
The ametropia problem " being cured " of oneself is thought afterwards, and is rectified not by the constraint of any external condition with other eyesights on daytime
Positive means are compared, and will not be brought any additional puzzlement, are a kind of very outstanding vision correction means.
Ortho-K dioptric, which rescues principle and common contact lens, the difference of essence, wears at night, optics
Optical effect is not played in area itself, but by the wearing of certain time, anterior surface of cornea is modelled as Ortho-K optics
The shape of area's rear surface (also known as base curve area), makes the refractive power of cornea itself change, and realizes the effect that dioptric is rescued.If
The flat curvature shaft radius of ratio cornea itself that the base curve area of Ortho-K is done is more flat, then plays the work of myoporthosis
With；If the flat curvature shaft radius of ratio cornea itself that Ortho-K base curve area is done is more precipitous, distance vision correction is played
Effect.
In several stages of the development experience of Ortho-K, it is divided into a variety of designs such as three arc areas, four arc areas, multi sphere area,
The design in whichever stage, the design of base curve area are all consistent, and are one section of complete circular arcs, other several common structures of segmental arc
At geometry designs, base curve is assisted to reach compressing and moulding to cornea, makes eyeglass inner surface, tear, generates between corneal epithelium
The resultant force that generates of activity of fluidics power, eyeglass mechanical pressure and eyelid strength is imposed to cornea middle section.Fig. 1 shows
The schematic diagram of Ortho-K is gone out, wherein BC is base curve area, and RC is reversion arc area, and AC is with the area Shi Hu, and PC is optional side
Arc area.Ortho-K can also not have the area Bian Hu, such as the Ortho-K of some three arcs area design, with suitable arc and side
Arc is integrated straight line arc.
Base curve area is the main treatment region of Ortho-K, and traditional Ortho-K base curve area is each designed to a ball
Face, radius of curvature require to be designed according to the decreasing concentration of patient.The existing Ortho-K overwhelming majority is directed to near-sightedness correction
It is designed.It finds that near-sighted type periphery defocus can be generated after some patientss wear Ortho-K during clinical use,
Axis oculi is controlled to increase, thus Ortho-K is used for adolescent myopia more and rescues and prevention and control, then discloses in WO2004/015479
A kind of Ortho-K of the more precipitous correction long sight of base curve area axis more flat than cornea.
Long sight has essence different from presbyopia, and long sight is a kind of ametropia, and presbyopia is a kind of adjusting force forfeiture.Presbyopia
Patient, which needs to realize simultaneously when guaranteeing distant vision clearly, regards close function.Currently without any Ortho-K
Correcting action can be played to presbyopia.
Utility model content
One aspect according to the present utility model provides a kind of Ortho-K for presbyopic correction, the cornea
Moulding mirror includes the inner surface and the outer surface opposite with the inner surface when wearing towards eye cornea, the inner surface
Including centrally located circular base curve area, wherein the base curve area is for oppressing anterior surface of cornea and moulding anterior surface of cornea
It causes to have and the consistent shape in base curve area.The face shape in the base curve area be it is aspherical, it is described aspherical in two-dimensional coordinate
It is the expression formula of the curve on plane rZ are as follows:
Wherein, R is the radius of curvature of the aspherical basic spherical surface, and r is any point on the curve away from abscissa
The vertical range of axis Z, A2iFor aspherical high-order coefficient, m, n are the integer not less than 1 and n > m, Q are asphericity coefficient,
Wherein, each point in the aspherical face shape carries out rotational symmetry around axis of abscissas Z by the curve negotiating
Change and obtain,
Wherein, the aspherical equivalent radius of curvature at diameter 4mm with it is described aspherical equivalent at diameter 2mm
The ratio between radius of curvature is 0.955 to 1.011,
Wherein, equivalent radius of curvature, which is calculate by the following formula, obtains:
Wherein, z be it is described it is aspherical on point rise, r be it is described it is aspherical on the point and the base curve area in
The distance between heart, and R ' be it is described it is aspherical on the point equivalent radius of curvature.
In one embodiment, the aspherical equivalent radius of curvature at diameter 4mm and described aspherical in diameter
The ratio between equivalent radius of curvature at 2mm is 0.967 to 1.007.
In one embodiment, the aspherical equivalent radius of curvature at diameter 4mm and described aspherical in diameter
The ratio between equivalent radius of curvature at 2mm is 0.967 to 1.002.
In one embodiment, the value of Q is not zero, and A2iValue be zero.
In one embodiment, the value of Q is -0.54 to 5.4.
In one embodiment, the value of Q is -0.35 to 4.1.
In one embodiment, the value of Q is -0.10 to 4.1.
In one embodiment, equivalent radius of curvature of the base curve area at diameter 2mm is 6.0mm to 10.0mm.
In one embodiment, equivalent radius of curvature of the base curve area at diameter 2mm is 7.0mm to 10.0mm.
In one embodiment, the diameter in the base curve area is 4.5mm to 7.0mm.
In one embodiment, the diameter in the base curve area is 5.0mm to 6.8mm.
In one embodiment, the diameter in the base curve area is 5.2mm to 6.5mm.
Other side according to the present utility model, provides a kind of Ortho-K, and the Ortho-K is included in
Inner surface and the outer surface opposite with the inner surface when wearing towards eye cornea, the inner surface include being located at center
Circular base curve area, wherein the base curve area for oppress anterior surface of cornea and by anterior surface of cornea fashion into have and institute
State the consistent shape in base curve area.The periphery of circular ring shape of the base curve area by circular central area and around the central area
Region composition, wherein the face shape of the central area is aspherical, the aspherical curve on two-dimensional coordinate system plane rZ
Expression formula are as follows:
Wherein, R is the radius of curvature of the aspherical basic spherical surface, and r is any point on the curve away from abscissa
The vertical range of axis Z, A2iFor aspherical high-order coefficient, m, n are the integer not less than 1 and n > m, Q are asphericity coefficient,
Wherein, each point in the aspherical face shape carries out rotational symmetry around axis of abscissas Z by the curve negotiating
Change and obtain,
Wherein, the aspherical equivalent radius of curvature at diameter 4mm with it is described aspherical equivalent at diameter 2mm
The ratio between radius of curvature is 0.955 to 1.011,
Wherein, equivalent radius of curvature, which is calculate by the following formula, obtains:
Wherein, z be it is described it is aspherical on point rise, r be it is described it is aspherical on the point and the base curve area in
The distance between heart, and R ' be it is described it is aspherical on the point equivalent radius of curvature.
The utility model at least has the following advantages that.
(1) the face shape in the base curve area of the Ortho-K of the utility model is aspherical, cornea can be made to realize after moulding
The refractive power of gradual change plucks the wearing mode of mirror daytime using mirror is worn at night, realizes the ametropia correction that merges with presbyopia, side
Just, beautiful, effective, more meet pursuit of the modern to quality of the life.
(2) correction such as frame-generic presbyopic glasses, common multifocal contact lenses mode eyeglass cannot keep synchronous with eyeball, suffer from
Person needs according to lens position after wearing and sees that the position of thing is constantly adjusted, or occurs when eyeglass occurs not placed in the middle
The states such as dazzle, blurred vision, dizziness；Ortho-K is naturally in center condition when wearing, and no matter user sees to which
Orientation is all not in the blurred vision generated by lens position variation and not applicable.
(3) presbyopia patient age is larger, and majority enters the cataract high-incidence season.The work based on keratocyte of the utility model
Property, it is reversible correction, after deactivating a period of time, cornea can be restored to original state, without any damage, facilitate patient subsequent
Other eye treatments, it is safer for modus operandi.
Term definition
Unless special circumstances, otherwise following definition is suitable for term used in this specification.
It is most central that base curve area (BC) is located at Ortho-K, is the inner surface in optics area, for oppressing anterior surface of cornea simultaneously
Anterior surface of cornea is modelled as its shape, the region of the cornea after moulding is optics area, plays the role of optical imagery.
Inverting arc area (RC) is the Two Areas closely coupled with base curve area, plays connection base curve area and with the area Shi Hu
Effect, forms gap between Ortho-K and anterior surface of cornea, plays the role of storing tear and tear is promoted to circulate.
It is called positioning arc area, match arc area etc. with the area Shi Hu (AC), close to reversion arc area, the region and cornea shape
Match, plays the role of positioning.
The area Bian Hu (PC) be it is optional, be located at Ortho-K outer most edge, and it is closely coupled with the area Shi Hu, it is general than with suitable
Arc area is more flat, with anterior corneal surface present it is certain turn over rake angle degree, guarantee cornea and moulding mirror periphery tear, oxygen exchange and
Circulation.
In addition, unless otherwise defined, otherwise being led belonging to the meaning of all scientific and technical terminologies used herein and the utility model
The technical staff in domain, which is generally understood, to be consistent.If any inconsistent, be subject to this specification and its including definition.
Detailed description of the invention
Fig. 1 schematically shows the side cross-sectional view of Ortho-K.
Fig. 2 is the schematic diagram that equivalent radius of curvature is calculated using rise method.
Specific embodiment
Following specific embodiments are only intended to the utility model be further explained explanation, but the utility model
It is not limited to specific embodiment below.Any variation on the basis of these embodiments, as long as it is practical new to meet this
The spirit and range of type, all will fall within the protection scope of the utility model.
The refractive status of cornea is mainly determined by its radius of curvature.Exist between the radius of curvature and corneal diopter of cornea
Conversion relation:
Wherein, K is the diopter of cornea, and unit D, R are the radius of curvature of anterior surface of cornea, and unit mm, n are cornea
Refractive index.For example, n can be 1.3375.
As shown in Figure 1, Ortho-K include when wearing inner surface IS towards eye cornea and with inner surface phase
Pair outer surface OS.The inner surface IS of Ortho-K includes centrally located circular base curve area BC.Ortho-K it is interior
Surface IS can also include being located at the reversion arc area RC of the circular ring shape of base curve area BC radial outside and being located to invert arc area RC diameter
Circular ring shape outward matches the area Shi Hu AC.In some embodiments, the inner surface IS of Ortho-K can also include being located at
The area the Bian Hu PC of circular ring shape with the area Shi Hu AC radial outside.When wearing, base curve area BC is used to oppress anterior surface of cornea and will
Anterior surface of cornea, which fashions into, to be had and the consistent shape of base curve area BC.When patient occurs ametropia, pass through Ortho-K
Base curve area BC adjust the radius of curvature of eye cornea front surface, i.e. R in adjustment above formula, so as to realize human eye dioptric
Not positive correction.Reversion arc area RC is for storing tear and tear being promoted to circulate.Match with the area Shi Hu AC with the shape of cornea with
For Ortho-K to be located in cornea.
In some embodiments of the utility model, the face shape in the base curve area of Ortho-K be it is aspherical so that cornea
Be shaped as it is aspherical after, refractive power is gradually increased from center to edge, realize gradual change refractive power variation, correct presbyopia.
The expression formula of the aspherical curve on two-dimensional coordinate system plane rZ are as follows:
Wherein, R is the radius of curvature of aspherical basic spherical surface, and r is any point hanging down away from axis of abscissas Z on the curve
Straight distance, A2iFor aspherical high-order coefficient, m, n are the integer not less than 1 and n > m, Q are asphericity coefficient,
Wherein, each point in aspherical face shape by the curve negotiating around axis of abscissas Z carry out rotational symmetry variation and
It obtains.
Some embodiments according to the present utility model, the aspherical equivalent radius of curvature at diameter 4mm and it is aspherical
The ratio between equivalent radius of curvature at diameter 2mm is 0.955 to 1.011, it is therefore preferable to 0.967 to 1.007, more preferably
0.967 to 1.002.
Equivalent radius of curvature R ' it can be calculate by the following formula and obtain:
As shown in Fig. 2, aspherical upper point A, z are the rise of A point, r is the distance between the center of A point and base curve area,
And R ' is the equivalent radius of curvature of A point.Equivalent radius of curvature is the amount that can be detected means detection, when r is smaller,
Aspherical equivalent radius of curvature is closer to its basic sphere curvature radius, such as in the present embodiment, base curve area diameter
In the range of within 2mm, equivalent radius of curvature is close to basic sphere curvature radius used when design.
Under above-described embodiment, the rise difference z and/or diameter at corneal diameter 4mm and at diameter 2mm can use
The ratio between equivalent radius of curvature at 4mm and at diameter 2mm η measures aspherical state, in which:
Wherein, z4、z2Respectively rise of the base curve area of Ortho-K at diameter 4mm, 2mm, and R '4、R’2Point
Not Wei Ortho-K equivalent radius of curvature of the base curve area at diameter 4mm, 2mm.
Table 1 shows some embodiments of the utility model, in this group of embodiment, the aspherical Q value used not for 0,
A2i=0。
In some embodiments of the utility model, the value of Q is -0.54 to 5.4, it is therefore preferable to -0.35 to 4.1, more
Preferably -0.10 to 4.1.
In some embodiments of the utility model, the base curve area of Ortho-K is that Q value is not 0 and A2i=0 aspheric
Face.
Equivalent radius of curvature in some embodiments of the utility model, at the diameter 4mm in base curve area and at diameter 2mm
The ratio between η be 1.011 to 0.955, it is therefore preferable to 1.007 to 0.967, more preferably 1.002 to 0.967.
Those skilled in the art are to understand to be, difference, the equivalent curvature of the refractive power at diameter 4mm and diameter 2mm
The ratio between radius can increase with the increase of diameter span, with R=8.0mm, for the embodiment of Q=0.65, in diameter 4mm and
The difference (i.e. additional optical focal power) for the refractive power realized at diameter 2mm is+1.5D, and that realizes at diameter 2mm and diameter 5mm bends
The difference of luminous power then can reach 2.75D.In the case where identical radius of curvature and Q value, diameter difference is bigger, the difference of refractive power
Also bigger.
In some embodiments of the utility model, base curve area is aspherical under lesser diameter, typically, in 4mm
In diameter range, the difference of enough refractive powers can be realized.
In some embodiments of the utility model, base curve area fashions into anterior surface of cornea with consistent with base curve area
After shape, refractive power difference of the cornea at 4mm diameter and 2mm diameter is+0.5D to+4.0D, it is therefore preferable to+1.0D to+
3.0D。
The above embodiments of the present invention only used aspherical Q value, this aspherical property placed in the middle requirement to eyeglass
Relatively high, eyeglass deviation will cause the appearance of higher order aberratons, influence image quality, so generally seldom making in ophthalmic lens
With.It however in the present invention, is finally to play dioptric by the cornea after being shaped, advantage is cornea and human eye one
Straight to keep naturally placed in the middle, this disadvantage is avoided by.
Those skilled in the art are to understand to be, can also be combined using aspherical high-order term with Q value, reach this reality
With novel purpose, and improve image quality of the eyeglass in situation not placed in the middle, the i.e. serious forgiveness to not center condition.
Due to aspherical difference (the additional light focus for realizing biggish refractive power within the scope of minor diameter of the utility model
Degree), precipitous power profile may generate dazzle interference under the conditions of night big pupil, therefore in some of the utility model
In embodiment, the neighboring area group of circular ring shape of the base curve area of Ortho-K by circular central area and around central area
Be at, wherein the face shape of central area it is discussed above aspherical, for realizing additional optical focal power.The periphery in base curve area
The face shape in region can be spherical surface either it is aspherical for the purpose of aberration correction, to realize night higher image quality.
For example, in one embodiment, the base curve area diameter of Ortho-K is 6.2mm.During base curve area from the center to diameter 5.0mm is
Heart district domain, the face shape of central area be it is aspherical, which is 9.2mm, using aspherical Q value
While use high order aspheric surface coefficient A4、A6, wherein Q=0.658, A4=2.437e-04, A6=7.499e-06.Base curve Qu Congzhi
Diameter 5.0mm to diameter 6.0mm is neighboring area, and the face shape of neighboring area is the spherical surface that radius of curvature is 9.2mm.This cornea modeling
Shape mirror makes cornea after moulding, realizes the variation of refractive power 38.2D ~ 41.2D in the optics area of 3mm-5mm, realization+3.0D's is attached
Add focal power；And in 5mm-6.2mm diameter range, provide with the consistent refractive power in center, reach human eye at night higher
Visual quality.
Although describing the utility model, those skilled in the art referring to (one or more) exemplary embodiment
It will be understood that the utility model is not limited to precise structure and component part described herein, and without departing from such as institute
In the case where the spirit and scope of the utility model that attached claim limits, various modifications, variation are understood that from the description of front
And deformation.The utility model is not limited by the shown sequence of step because some steps can in a different order and/or
It is carried out simultaneously with other steps.Therefore, the utility model is not limited to disclosed (one or more) specific embodiment, but will
It will include all embodiments being within the purview of the appended claims.
Claims (13)
1. a kind of Ortho-K for presbyopic correction, the Ortho-K include when wearing towards in eye cornea
Surface and the outer surface opposite with the inner surface, the inner surface include centrally located circular base curve area, wherein institute
State base curve area has and the consistent shape in base curve area, spy for oppressing anterior surface of cornea and fashioning into anterior surface of cornea
Sign is that the face shape in the base curve area is aspherical, the expression formula of the aspherical curve on two-dimensional coordinate system plane rZ
Are as follows:
Wherein, R is the radius of curvature of the aspherical basic spherical surface, and r is any point on the curve away from axis of abscissas Z's
Vertical range, A2iFor aspherical high-order coefficient, m, n are the integer not less than 1 and n > m, Q are asphericity coefficient,
Wherein, each point in the aspherical face shape carries out rotational symmetry variation around axis of abscissas Z by the curve negotiating
And obtain,
Wherein, the aspherical equivalent radius of curvature at diameter 4mm and the aspherical equivalent curvature at diameter 2mm
The ratio between radius is 0.955 to 1.011,
Wherein, equivalent radius of curvature, which is calculate by the following formula, obtains:
Wherein, z be it is described it is aspherical on point rise, r be it is described it is aspherical on the point and the base curve area center it
Between distance, and R ' be it is described it is aspherical on the point equivalent radius of curvature.
2. Ortho-K according to claim 1, which is characterized in that the aspherical equivalent song at diameter 4mm
The ratio between rate radius and the aspherical equivalent radius of curvature at diameter 2mm are 0.967 to 1.007.
3. Ortho-K according to claim 1, which is characterized in that the aspherical equivalent song at diameter 4mm
The ratio between rate radius and the aspherical equivalent radius of curvature at diameter 2mm are 0.967 to 1.002.
4. Ortho-K according to claim 1, which is characterized in that the value of Q is not zero, and A2iValue be
Zero.
5. Ortho-K according to claim 1, which is characterized in that the value of Q is -0.54 to 5.4.
6. Ortho-K according to claim 1, which is characterized in that the value of Q is -0.35 to 4.1.
7. Ortho-K according to claim 1, which is characterized in that the value of Q is -0.10 to 4.1.
8. Ortho-K according to claim 1, which is characterized in that equivalent song of the base curve area at diameter 2mm
Rate radius is 6.0mm to 10.0mm.
9. Ortho-K according to claim 1, which is characterized in that equivalent song of the base curve area at diameter 2mm
Rate radius is 7.0mm to 10.0mm.
10. Ortho-K according to claim 1, which is characterized in that the diameter in the base curve area be 4.5mm extremely
7.0mm。
11. Ortho-K according to claim 1, which is characterized in that the diameter in the base curve area be 5.0mm extremely
6.8mm。
12. Ortho-K according to claim 1, which is characterized in that the diameter in the base curve area be 5.2mm extremely
6.5mm。
13. a kind of Ortho-K for presbyopic correction, the Ortho-K include when wearing towards eye cornea
Inner surface and the outer surface opposite with the inner surface, the inner surface include centrally located circular base curve area, wherein
The base curve area for oppress anterior surface of cornea and by anterior surface of cornea fashion into have with the consistent shape in base curve area,
It being characterized in that, the neighboring area of circular ring shape of the base curve area by circular central area and around the central area forms,
Wherein, the face shape of the central area is aspherical, the expression formula of the aspherical curve on two-dimensional coordinate system plane rZ
Are as follows:
Wherein, R is the radius of curvature of the aspherical basic spherical surface, and r is any point on the curve away from axis of abscissas Z's
Vertical range, A2iFor aspherical high-order coefficient, m, n are the integer not less than 1 and n > m, Q are asphericity coefficient,
Wherein, each point in the aspherical face shape carries out rotational symmetry variation around axis of abscissas Z by the curve negotiating
And obtain,
Wherein, the aspherical equivalent radius of curvature at diameter 4mm and the aspherical equivalent curvature at diameter 2mm
The ratio between radius is 0.955 to 1.011,
Wherein, equivalent radius of curvature, which is calculate by the following formula, obtains:
Wherein, z be it is described it is aspherical on point rise, r be it is described it is aspherical on the point and the base curve area center it
Between distance, and R ' be it is described it is aspherical on the point equivalent radius of curvature.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112415778A (en) * | 2020-11-25 | 2021-02-26 | 上海艾康特医疗科技有限公司 | Cornea moulding mirror for myopia control |
| CN112433390A (en) * | 2020-11-25 | 2021-03-02 | 上海艾康特医疗科技有限公司 | Cornea shaping mirror |
-
2017
- 2017-12-06 CN CN201721682223.6U patent/CN208756305U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112415778A (en) * | 2020-11-25 | 2021-02-26 | 上海艾康特医疗科技有限公司 | Cornea moulding mirror for myopia control |
| CN112433390A (en) * | 2020-11-25 | 2021-03-02 | 上海艾康特医疗科技有限公司 | Cornea shaping mirror |
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