CN109407341A - The hard contact eyeglass and its manufacturing method of a kind of reduction side central distance vision defocus - Google Patents
The hard contact eyeglass and its manufacturing method of a kind of reduction side central distance vision defocus Download PDFInfo
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- CN109407341A CN109407341A CN201811393987.2A CN201811393987A CN109407341A CN 109407341 A CN109407341 A CN 109407341A CN 201811393987 A CN201811393987 A CN 201811393987A CN 109407341 A CN109407341 A CN 109407341A
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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
- G02C7/041—Contact lenses for the eyes bifocal; multifocal
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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
- G02C7/024—Methods of designing ophthalmic lenses
- G02C7/028—Special mathematical design techniques
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention discloses the hard contact eyeglasses and its manufacturing method of central distance vision defocus by a kind of reduction, belong to eyeglass manufacturing technology field, optical mirror slip including multi sphere section composition, center of lens position is set as optics area, and eyeglass is successively arranged defocus area, transition arcs area and circumference arc area from optics area outward.The present invention is in addition to other than optics area is arranged in optical mirror slip center, also defocus area, transition arcs area and circumference arc area are successively added outward in optics area, while determining optics area control centre's eyesight, other central distance vision defocus is reduced by defocus area, so that other center is imaged on the retina or within retina, effectively to achieve the purpose that slow down myopia development.
Description
Technical field
The present invention relates to eyeglass manufacturing technology field, in particular to the hardness of central distance vision defocus connects by a kind of reduction
Touch eyeglass and its manufacturing method.
Background technique
The main reason for other central distance vision defocus is one of theory of myopia development, forms other central distance vision defocus phenomenon
Have: (1) refractive power of corneal center is eager to excel than the refractive power of edge of cornea；(2) retina is not the spherical shape of rule, closer
It is oval.These reasons cause after myoporthosis, and central area is imaged on after retina by retina, form other central distance vision
Defocus, this phenomenon will lead to axis oculi and increase to increase myopia degree, according to studies have shown that the every increase 1mm of axis oculi, near-sighted degree
Number will will increase 300 degree.
Traditional eyeglass all focuses on control centre's eyesight with mirror, it is therefore an objective to provide good central vision, but can not
Other central retina imaging position is taken into account, other central distance vision defocus is formed, increases to accelerate to increase myopia so as to cause axis oculi
Degree.
Summary of the invention
The purpose of the present invention is to provide the hard contact eyeglass and its manufacturing method of central distance vision defocus by a kind of reduction,
To ensure the image quality of other central retina.
In order to achieve the above object, hard contact eyeglass of the present invention using central distance vision defocus by a kind of reduction, including one
The optical mirror slip of multi sphere section composition, center of lens position are set as optics area, the eyeglass from optics area be successively arranged outward from
Jiao Qu, transition arcs area and circumference arc area.
Further, the radius of curvature of defocus area inner surface is determined as the radius of curvature of cornea corresponding region.
Further, the radius of curvature r of defocus area outer surfaceOLDetermination function are as follows:
Wherein, A=2nL 2roc-4nLroc+2roc+2yOLnL-2nLroc 2Dout+2yOLnLDoutroc-2yOL,
B=(xc 2+yOL 2)nL 4,
C=(2rocyOL-4yOL 2-4xc 2)nL 3,
D=(5xc 2-xc 2Dout 2roc 2-2xc 2Doutroc-6yOLroc+6yOL 2+roc 2)nL 2,
E=(6yOLroc+2xc 2Doutroc-2xc 2-4yOL 2-2roc 2)nL+(yOL-roc)2,
F=DoutnLroc+3nL-nL 2- 2,
yOL=yc+ctc,
In formula: DoutFor the defocusing amount on retina, the tie point coordinate of optics area inner surface and defocus area inner surface is
(xc,yc), the tie point coordinate of optics area outer surface and defocus area outer surface is (xOL,yOL), and coordinate (xc,yc) and coordinate
(xOL,yOL) position is corresponding, ctcFor thickness at tie point, nLFor lens index, rocIndicate the curvature half of defocus area inner surface
Diameter, rc1For the average radius of curvature of anterior surface of cornea.
Further, the width w of defocus area outer surface is identical with the width w of defocus area inner surface and determines letter
Number is equal are as follows:
W=α × tan θ,
In formula, a indicates cornea to the distance of pupil center, θ expression human eye mono-vision angle number.
Further, the radius of curvature of optics area inner surface is equal to the average radius of curvature of anterior surface of cornea, described
The determination function of the radius of curvature of optics area outer surface are as follows:
Wherein: ctLFor lens center thickness, DdegIndicate the myopia degree of human eye.
Further, the diameter of optics area outer surface is identical with the diameter of optics area inner surface and has as follows
Function determines:
Oz=1.5 × dt,
Wherein, oz indicates the diameter in optics area, dtIndicate human eye pupil diameter.
Further, the coordinate (xc,yc) in abscissa determined by the diameter oz in the optics area, specifically:
On the other hand, a kind of manufacturing method of the hard contact eyeglass of reduction side central distance vision defocus, the eyeglass packet are provided
Include the optical mirror slip of multi sphere section composition, center of lens position is set as optics area, eyeglass from optics area be successively arranged outward from
Jiao Qu, transition arcs area and circumference arc area, comprising:
Obtain the myopia degree D of patientdeg, paraxonic defocusing amount Dout, patient's anterior surface of cornea mean radius of curvature rc1And
Patient's eye pupil diameter dt；
According to the myopia degree D of patientdegDetermine the design parameter in the optics area；
According to paraxonic defocusing amount DoutWith the design parameter in the optics area, the design parameter in the defocus area is calculated.
Further, the design parameter in the optics area include the lens thickness in optics area, optics area lens index,
The radius of curvature of optical area diameter, the radius of curvature of optics area outer surface and optics area inner surface；
The radius of curvature of optics area inner surface is equal to patient's anterior surface of cornea mean radius of curvature rc1；
The radius of curvature r of optics area outer surfaceLIt is determined by such as minor function:
Wherein: ctLFor optics area lens thickness, nLFor optics area lens index；
According to the patient's eye pupil diameter dtCalculating optical area diameter oz, calculation formula are as follows:
Oz=1.5 × dt。
Further, the design parameter in the defocus area includes the radius of curvature of defocus area outer surface, defocus area inner surface
Radius of curvature and defocus area width, it is described according to paraxonic defocusing amount DoutWith the design parameter in the optics area, institute is calculated
State the design parameter in defocus area, comprising:
By the radius of curvature r of defocus area inner surfaceocIt is determined as the radius of curvature r of cornea corresponding regionc2；
According to the radius of curvature of defocus area inner surface, calculate the radius of curvature of defocus area outer surface, it is described from
The radius of curvature of the outer surface Jiao Qu is determined by such as minor function:
Wherein, A=2nL 2roc-4nLroc+2roc+2yOLnL-2nLroc 2Dout+2yOLnLDoutroc-2yOL,
B=(xc 2+yOL 2)nL 4,
C=(2rocyOL-4yOL 2-4xc 2)nL 3,
D=(5xc 2-xc 2Dout 2roc 2-2xc 2Doutroc-6yOLroc+6yOL 2+roc 2)nL 2,
E=(6yOLroc+2xc 2Doutroc-2xc 2-4yOL 2-2roc 2)nL+(yOL-roc)2,
F=DoutnLroc+3nL-nL 2- 2,
yOL=yc+ctc,
In formula: DoutFor the defocusing amount on retina, the tie point coordinate of optics area inner surface and defocus area inner surface is
(xc,yc), the tie point coordinate of optics area outer surface and defocus area outer surface is (xOL,yOL), and coordinate (xc,yc) and coordinate
(xOL,yOL) position is corresponding, ctcFor thickness at tie point, nLFor lens index, rocIndicate the curvature half of defocus area inner surface
Diameter, rc1For the average radius of curvature of anterior surface of cornea.
Further, the width w of defocus area outer surface is identical with the width w of defocus area inner surface and determines letter
Number is equal are as follows:
W=α × tan θ,
In formula, a indicates cornea to the distance of pupil center, θ expression human eye mono-vision angle number.
Further, the coordinate (xc,yc) in abscissa determined by the diameter oz in the optics area, specifically:
Compared with prior art, there are following technical effects by the present invention: the present invention by lens optical area outward successively
Defocus area, transition arcs area and circumference arc area are set, and central ray focusing is fallen on the retina, and the light focusing at edge falls in view
In front of film, center imaging position by retina is taken into account while guaranteeing that eyeglass provides good central vision, so that retina
Periphery forms near-sighted defocus, slows down near-sighted growth rate.
Detailed description of the invention
With reference to the accompanying drawing, specific embodiments of the present invention will be described in detail:
Fig. 1 is a kind of structural schematic diagram of the hard contact eyeglass of reduction side central distance vision defocus；
Fig. 2 is the optic path schematic diagram for reducing the hard contact eyeglass of other central distance vision defocus；
Fig. 3 is the geometrical analysis schematic diagram for reducing the hard contact eyeglass of other central distance vision defocus；
Fig. 4 is a kind of flow diagram of the hard contact method for manufacturing lens of reduction side central distance vision defocus.
Specific embodiment
In order to further explain feature of the invention, reference should be made to the following detailed description and accompanying drawings of the present invention.Institute
Attached drawing is only for reference and purposes of discussion, is not used to limit protection scope of the present invention.
As shown in Figure 1, present embodiment discloses a kind of hard contact eyeglasses of central distance vision defocus by reduction, including more than one
The optical mirror slip of segmental arc composition, center of lens position are set as optics area, and the eyeglass is successively arranged defocus from optics area outward
Area, transition arcs area and circumference arc area.Including Arc lens, which includes eyeglass inner surface base curve 1 and eyeglass outer surface
Base curve 2, optical mirror slip center are set as optics area, and the optical mirror slip is successively arranged defocus area and mistake from optics area outward
The area Du Hu, circumference arc area, defocus arc area include defocus arc inner surface 3 and defocus arc outer surface 4, and transition arcs area includes in transition arcs
Surface 5 and transition arcs outer surface 6, circumference arc area include circumference arc inner surface 7 and circumference arc outer surface 8.Wherein, defocus area is set
Count radius of curvature, the radius of curvature of defocus area inner surface and the width in defocus area that parameter is defocus area outer surface.
The radius of curvature of defocus area inner surface is determined as the radius of curvature of outer corneal surface corresponding region.Cornea appearance
The average radius of curvature r in facec1It corneal topography can be used directly measures and obtain.In actual application, eyeglass is worn over cornea
On, the region in eyeglass inner surface defocus area and outer corneal surface contact just belongs to the corresponding region of cornea.It writes from memory in corneal topography
Recognizing setting can provide since corneal center, and the region diameter 3mm, 5mm, 7mm is averaged or the radius of curvature of each point, pass through cornea
The position in the defocus region of topographic map and eyeglass can obtain the average curvature half of outer corneal surface corresponding position from topographic map
Diameter.
The radius of curvature r of defocus area outer surfaceOLDetermination function are as follows:
Wherein, A=2nL 2roc-4nLroc+2roc+2yOLnL-2nLroc 2Dout+2yOLnLDoutroc-2yOL,
B=(xc 2+yOL 2)nL 4,
C=(2rocyOL-4yOL 2-4xc 2)nL 3,
D=(5xc 2-xc 2Dout 2roc 2-2xc 2Doutroc-6yOLroc+6yOL 2+roc 2)nL 2,
E=(6yOLroc+2xc 2Doutroc-2xc 2-4yOL 2-2roc 2)nL+(yOL-roc)2,
F=DoutnLroc+3nL-nL 2- 2,
yOL=yc+ctc,
In formula: DoutFor the defocusing amount on retina, the tie point coordinate of optics area inner surface and defocus area inner surface is
(xc,yc), the tie point coordinate of optics area outer surface and defocus area outer surface is (xOL,yOL), and coordinate (xc,yc) and coordinate
(xOL,yOL) position is corresponding, ctcFor thickness at tie point, nLFor lens index, rocIndicate the curvature half of defocus area inner surface
Diameter, rc1For the average radius of curvature of outer corneal surface.
As shown in figure 3, due to the radius of curvature and cornea of defocus area inner surface be it is identical, set so value just derives from
The radius of curvature of the standby cornea measured, i.e. the radius of curvature r of defocus area inner surfaceocThe song of=outer corneal surface corresponding region
Rate radius rc2。
Thickness ct at tie pointcCalculation formula are as follows:
Wherein, ctLFor lens center thickness, lens center thickness is to collect test data simultaneously by carrying out destructive test
The parameter determined after statistics.
Wherein, coordinate (xc,yc) in abscissa determined by the diameter oz in the optics area, specifically:
As shown in figure 3, coordinate (xOL,yOL) in ordinate are as follows: yOL=yc+ctc, abscissa xOL=xc。
Further, the width w of defocus area outer surface is identical with the width w of defocus area inner surface and determines that function is equal
Are as follows:
W=α × tan θ,
In formula, a indicates that cornea to the distance of pupil center, can be used device measuring and obtain, and θ indicates human eye mono-vision
Angle number, as shown in figure 3, the width w in the defocus area refers to the vertical range between defocus area outer periphery and inner periphery.
It should be noted that the designing points in defocus area mainly determine lens curvature radius, and then ensure design
The value that defocus degree anastomosis apparatus is measured.The design in defocus area is so that rim ray focuses in front of retina, and then is formed
Near-sighted defocus slows down the growth of myopia degree.
Further, the design parameter in optics area includes the song of the radius of curvature of optics area outer surface, optics area inner surface
Rate radius, optical area diameter, the lens thickness in optics area and the lens index in optics area.Wherein:
(1) radius of curvature of optics area inner surface is equal to the average radius of curvature of anterior surface of cornea；
(2) the determination function of the radius of curvature of optics area outer surface are as follows:
Wherein: ctLFor lens center thickness, DdegIndicate the myopia degree of human eye.
(3) diameter of the diameter of optics area outer surface and optics area inner surface is identical drifted along true just like minor function
It is fixed:
Oz=1.5 × dt,
Wherein, oz indicates the diameter in optics area, dtIndicate human eye pupil diameter.
(4) lens thickness in optics area, which uses, is obtained after counting to experimental data by carrying out a large amount of fracture experiments
It arrives, the lens index in optics area is known quantity.
It should be noted that it is the gentle curvature transition so that defocus area and circumference arc area that transition arcs area, which plays a role,
Radius of curvature value is (defocus area radius of curvature+circumference arc area radius of curvature)/2 under normal circumstances；Its width ordinary circumstance takes
Value is between 0.2-0.7.
Circumference arc area it needs to be determined that parameter only one interior surface curvature radius, the design of this radius of curvature only needs
Meet and be greater than cornea periphery radius of curvature, is known in industry.
Further, as shown in Fig. 2, the optical path of the hard contact eyeglass of the reduction side central distance vision defocus in the present embodiment
Transmission process are as follows: central ray is just focused and is fallen on the retina, and the light focusing at edge is fallen in front of retina or front,
It is centrally formed near-sighted defocus by retina, slows down near-sighted growth rate.
As shown in figure 4, present embodiment discloses a kind of manufacturers of the hard contact eyeglass of central distance vision defocus by reduction
Method, the eyeglass include the optical mirror slip of multi sphere section composition, and center of lens position is set as optics area, and eyeglass is outside from optics area
It is successively arranged defocus area, transition arcs area and circumference arc area, includes the following steps S1 to S3:
S1, the myopia degree D that patient is detected by instrumentdeg, paraxonic defocusing amount Dout, the average song of patient's anterior surface of cornea
Rate radius rc1And patient's eye pupil diameter dt；
S2, the myopia degree D according to patientdegDetermine the design parameter in the optics area；
S3, according to paraxonic defocusing amount DoutWith the design parameter in the optics area, the design parameter in the defocus area is calculated.
Specifically, in step S2, the design parameter in optics area includes the eyeglass refraction of the lens thickness in optics area, optics area
The radius of curvature of rate, optical area diameter, the radius of curvature of optics area outer surface and optics area inner surface.Wherein:
The radius of curvature of optics area inner surface is equal to patient's anterior surface of cornea mean radius of curvature rc1。
In known optical area when the radius of curvature of inner surface, have:
Then obtain the radius of curvature r of optics area outer surfaceLDetermination function are as follows:
Wherein: ctLFor optics area lens center thickness, nLFor optics area lens index.
According to the patient's eye pupil diameter dtCalculating optical area diameter oz, calculation formula are as follows:
Oz=1.5 × dt。
Specifically, in step s3, the design parameter in defocus area includes the radius of curvature of defocus area outer surface, in defocus area
The radius of curvature on surface and the width in defocus area.Wherein:
By the radius of curvature r of defocus area inner surfaceocIt is determined as the radius of curvature r of cornea corresponding regionc2；
After the curvature radius calculation of defocus area inner surface obtains, as shown in figure 3, then having:
Wherein, cteqShow defocus area surfaces externally and internally radius of curvature extended line with the spacing after optical axis intersection, referred to as defocus area etc.
Imitate center thickness.
As shown in figure 3, cteqAnd rOLFor unknown number, ct is eliminated by Simultaneous Equationseq, then defocus area outer surface can be obtained
Radius of curvature rOLIt is determined by such as minor function:
Wherein, A=2nL 2roc-4nLroc+2roc+2yOLnL-2nLroc 2Dout+2yOLnLDoutroc-2yOL,
B=(xc 2+yOL 2)nL 4,
C=(2rocyOL-4yOL 2-4xc 2)nL 3,
D=(5xc 2-xc 2Dout 2roc 2-2xc 2Doutroc-6yOLroc+6yOL 2+roc 2)nL 2,
E=(6yOLroc+2xc 2Doutroc-2xc 2-4yOL 2-2roc 2)nL+(yOL-roc)2,
F=DoutnLroc+3nL-nL 2- 2,
yOL=yc+ctc,
In formula: DoutFor the defocusing amount on retina, the tie point coordinate of optics area inner surface and defocus area inner surface is
(xc,yc), the tie point coordinate of optics area outer surface and defocus area outer surface is (xOL,yOL), and coordinate (xc,yc) and coordinate
(xOL,yOL) position is corresponding, ctcFor thickness at tie point, nLFor lens index, rocIndicate the curvature half of defocus area inner surface
Diameter, rc1For the average radius of curvature of anterior surface of cornea.
The width w of defocus area outer surface is identical with the width w of defocus area inner surface and determines that function is equal are as follows:
W=α × tan θ,
In formula, a indicates cornea to the distance of pupil center, θ expression human eye mono-vision angle number.
Further, coordinate (xc,yc) in abscissa determined by the diameter oz in the optics area, specifically:
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. the hard contact eyeglass of central distance vision defocus by a kind of reduction, the optical mirror slip including multi sphere section composition, in eyeglass
Heart position is set as optics area, which is characterized in that the eyeglass is successively arranged defocus area, transition arcs area and week from optics area outward
The area Bian Hu.
2. the hard contact eyeglass as described in claim 1 for reducing other central distance vision defocus, which is characterized in that the defocus area
The radius of curvature of inner surface is determined as the radius of curvature of outer corneal surface corresponding region.
3. the hard contact eyeglass as claimed in claim 2 for reducing other central distance vision defocus, which is characterized in that the defocus area
The radius of curvature r of outer surfaceOLDetermination function are as follows:
Wherein, A=2nL 2roc-4nLroc+2roc+2yOLnL-2nLroc 2Dout+2yOLnLDoutroc-2yOL,
B=(xc 2+yOL 2)nL 4,
C=(2rocyOL-4yOL 2-4xc 2)nL 3,
D=(5xc 2-xc 2Dout 2roc 2-2xc 2Doutroc-6yOLroc+6yOL 2+roc 2)nL 2,
E=(6yOLroc+2xc 2Doutroc-2xc 2-4yOL 2-2roc 2)nL+(yOL-roc)2,
F=DoutnLroc+3nL-nL 2- 2,
yOL=yc+ctc,
In formula: DoutFor the defocusing amount on retina, the tie point coordinate of optics area inner surface and defocus area inner surface is (xc,
yc), the tie point coordinate of optics area outer surface and defocus area outer surface is (xOL,yOL), and coordinate (xc,yc) and coordinate (xOL,
yOL) position is corresponding, ctcFor thickness at tie point, nLFor lens index, rocIndicate defocus area inner surface radius of curvature be
The radius of curvature r of cornea corresponding regionc2, rc1For the average radius of curvature of anterior surface of cornea.
4. the hard contact eyeglass as claimed in claim 3 for reducing other central distance vision defocus, which is characterized in that the defocus area
The width w of outer surface is identical with the width w of defocus area inner surface and determines that function is equal are as follows:
W=α × tan θ,
In formula, a indicates cornea to the distance of pupil center, θ expression human eye mono-vision angle number.
5. the hard contact eyeglass as claimed in claim 3 for reducing other central distance vision defocus, which is characterized in that the optics area
The radius of curvature of inner surface is equal to the average radius of curvature of anterior surface of cornea, the determination of the radius of curvature of optics area outer surface
Function are as follows:
Wherein: ctLFor lens center thickness, DdegIndicate the myopia degree of human eye.
6. the hard contact eyeglass as described in claim 1 for reducing other central distance vision defocus, which is characterized in that the optics area
The diameter of outer surface is identical with the diameter of optics area inner surface and determines just like minor function:
Oz=1.5 × dt,
Wherein, oz indicates the diameter in optics area, dtIndicate human eye pupil diameter.
7. the manufacturing method of the hard contact eyeglass of central distance vision defocus by a kind of reduction, which is characterized in that the eyeglass includes one
The optical mirror slip of multi sphere section composition, center of lens position are set as optics area, eyeglass from optics area be successively arranged outward defocus area,
Transition arcs area and circumference arc area, comprising:
Obtain the myopia degree D of patientdeg, paraxonic defocusing amount Dout, patient's anterior surface of cornea mean radius of curvature rc1And patient
Eye pupil diameter dt；
According to the myopia degree D of patientdegDetermine the design parameter in the optics area；
According to paraxonic defocusing amount DoutWith the design parameter in the optics area, the design parameter in the defocus area is calculated.
8. the manufacturing method of the hard contact eyeglass as claimed in claim 7 for reducing other central distance vision defocus, which is characterized in that
The design parameter in the optics area includes the lens thickness in optics area, the lens index in optics area, optical area diameter, optics area
The radius of curvature of outer surface and the radius of curvature of optics area inner surface；
The radius of curvature of optics area inner surface is equal to patient's anterior surface of cornea mean radius of curvature rc1；
The radius of curvature r of optics area outer surfaceLIt is determined by such as minor function:
Wherein: ctLFor optics area lens thickness, nLFor optics area lens index；
According to the patient's eye pupil diameter dtCalculating optical area diameter oz, calculation formula are as follows:
Oz=1.5 × dt。
9. the manufacturing method of the hard contact eyeglass as claimed in claim 7 for reducing other central distance vision defocus, which is characterized in that
The design parameter in the defocus area includes the radius of curvature and defocus of the radius of curvature of defocus area outer surface, defocus area inner surface
The width in area, it is described according to paraxonic defocusing amount DoutWith the design parameter in the optics area, the design ginseng in the defocus area is calculated
Number, comprising:
By the radius of curvature r of defocus area inner surfaceocIt is determined as the radius of curvature r of cornea corresponding regionc2；
According to the radius of curvature of defocus area inner surface, the radius of curvature of defocus area outer surface, the defocus area are calculated
The radius of curvature of outer surface is determined by such as minor function:
Wherein, A=2nL 2roc-4nLroc+2roc+2yOLnL-2nLroc 2Dout+2yOLnLDoutroc-2yOL,
B=(xc 2+yOL 2)nL 4,
C=(2rocyOL-4yOL 2-4xc 2)nL 3,
D=(5xc 2-xc 2Dout 2roc 2-2xc 2Doutroc-6yOLroc+6yOL 2+roc 2)nL 2,
E=(6yOLroc+2xc 2Doutroc-2xc 2-4yOL 2-2roc 2)nL+(yOL-roc)2,
F=DoutnLroc+3nL-nL 2- 2,
yOL=yc+ctc,
In formula: DoutFor the defocusing amount on retina, the tie point coordinate of optics area inner surface and defocus area inner surface is (xc,
yc), the tie point coordinate of optics area outer surface and defocus area outer surface is (xOL,yOL), and coordinate (xc,yc) and coordinate (xOL,
yOL) position is corresponding, ctcFor thickness at tie point, nLFor lens index, rocIndicate the radius of curvature of defocus area inner surface,
rc1For the average radius of curvature of anterior surface of cornea.
10. the manufacturing method of the hard contact eyeglass as claimed in claim 8 for reducing other central distance vision defocus, feature exist
In the width w of defocus area outer surface is identical with the width w of defocus area inner surface and determines that function is equal are as follows:
W=α × tan θ,
In formula, a indicates cornea to the distance of pupil center, θ expression human eye mono-vision angle number.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110174778A (en) * | 2019-05-28 | 2019-08-27 | 甄毅 | The eyeglass, contact lens and eyeglass pad pasting of myopia development can be effectively relieved |
| CN110275316A (en) * | 2019-07-02 | 2019-09-24 | 欧普康视科技股份有限公司 | A kind of multi-functional hard corneal contact lens |
| US20220179240A1 (en) * | 2020-12-03 | 2022-06-09 | Eyes Color Co., Ltd. | Contact lens |
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