CN202920413U - Astigmatism corrective intraocular lens - Google Patents
Astigmatism corrective intraocular lens Download PDFInfo
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- CN202920413U CN202920413U CN201220462677.3U CN201220462677U CN202920413U CN 202920413 U CN202920413 U CN 202920413U CN 201220462677 U CN201220462677 U CN 201220462677U CN 202920413 U CN202920413 U CN 202920413U
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Abstract
Disclosed is an astigmatism corrective intraocular lens. The astigmatism corrective intraocular lens comprises an optical part and at least two loops, wherein the optical part is formed by an optical portion and the edge of the optical portion, and the loops are connected with the optical part. The front surface of the optical portion is a toroidal surface, and the back surface of the optical portion is an aspheric surface. By means of the astigmatism corrective intraocular lens, a doctor can conveniently master axial positions of the intraocular lens in the process of implantation, a rotation error of the intraocular lens implantation is reduced, optical performance of the intraocular lens is improved, spherical aberration and high order aberration of intraocular lens eyes can be uniformly corrected at the same time when astigmatism is corrected, and imaging quality can be improved.
Description
Technical field
This utility model belongs to artificial intraocular lenses's face shape design field.Particularly, to relate to a kind of anterior optic surface be that complex loop curved surface and optic rear surface are aspheric Novel astigmatic rectification type artificial intraocular lenses to this utility model.
Background technology
When light was injected into the different material of another kind of optical density by a kind of material, the direction of propagation of its light produced deviation, and this phenomenon is called the dioptric phenomenon, and diopter represents the size (refractive power) of this dioptric phenomenon, and unit is diopter (being abbreviated as " D ").The 1D refractive power is equivalent to and parallel rays can be focused on 1 meter focal length.The effect of the eyes refracted ray light of complaining about being wronged represents with focal power the ability of dioptric also to be called diopter.Diopter is that lens are for the refractive intensity of light.Diopter is the size unit of refractive power, represents with D, has both referred to parallel rays through this refractive material, and becoming the refractive power of focus this refractive material when 1M is 1 diopter or 1D.For lens, the unit that refers to power of lens is during as the focal length 1M of lens, and the refractive power of this eyeglass is that 1D diopter and focal length are inversely proportional to.The refractive power F=1/f of lens, wherein f is the focal length of lens, and in formula: the dioptric unit of force is diopter, and symbol is D, and dimension is L
-1, 1D=1m
-1Dioptric system of the common composition of artificial intraocular lenses's opticator and the cornea of human eye is born approximately 30% refractive power of human eye.Fig. 1 schematically shows the basic comprising of human eye dioptric system.As shown in Figure 1, the artificial intraocular lenses in implanted human eye after by support fasten with a rope, string, etc. 5 and pouch 12 between interaction force maintain relative position in people's camera oculi posterior pouch 12.The contraction of pouch and varicose act on to be supported on button loop, is squeezed or stretches with supporting the artificial intraocular lenses who is connected that fastens with a rope, string, etc., and will move forward and backward along axis oculi direction D-D '.
Ametropia is on the obvious a kind of factor of image quality impact, wherein astigmatism is a kind of common people's ametropia phenomenon, refer to that eyeball refractive power on different warps is inconsistent, or the diopter of same warp does not wait, so that the parallel rays that enters ophthalmic can not form focus on retina, and forms the phenomenon of focal line.In normal population, corneal astigmatism has a strong impact on people's visual quality greater than the 15%-29% that accounts for of 1.5D.Accompanying at present the method for the up-to-date treatment of astigmatic cataract was to implant within the eye an astigmatic type artificial intraocular lenses (Toric type artificial intraocular lenses) to correct the purpose of corneal astigmatism when reaching normal dioptric.
Toric type artificial intraocular lenses began to introduce to the market from 1997, in succession by U.S. FDA, European Community's safety certification (CE) approval.Toric type artificial intraocular lenses claims again astigmatism correction type artificial intraocular lenses, its core is to adopt complex loop curved surface (toroidal) extra-column mirror degree on artificial intraocular lenses original dioptric basis, utilize complex loop curved surface inconsistent characteristics of diopter on each warp direction, correct the astigmatism of cataract patient cornea.In order to make human eye reach better visual effect, Toric type artificial intraocular lenses generally is combined with aspheric surface, corrects the spherical aberration of artificial intraocular lenses's eye when correcting corneal astigmatism.
the present aspheric surface Toric type artificial intraocular lenses of main flow on the market mostly is placed on aspheric surface the front surface (anterior chamber's direction) of crystal, corresponding Toric type artificial intraocular lenses's complex loop curved surface has two kinds of distribution modes: a kind of design concept is: Toric face and aspheric surface are lived apart in the crystal both sides, being about to the Toric face is placed on the artificial intraocular lenses rear surface and aspheric surface is placed on artificial intraocular lenses's front surface, typical in U.S. Alcon(Ai Erkang) the astigmatic artificial intraocular lenses of Acrysof of company, the Toric design is adopted in the crystal rear surface, the astigmatism of rectifiable eye cornea 1.03D-4.11D, another kind of design concept is: the Toric face is combined with aspheric surface, be distributed in together the crystal front surface, typically as the TECNIS Toric series artificial intraocular lenses of Allergan (AMO) company, can correct the astigmatism of eye cornea 0.69D-2.74D.
Have axial labelling (expression artificial intraocular lenses minimum optical power direction) on Toric type artificial intraocular lenses's Toric face, need in operation Toric type artificial intraocular lenses's axial labelling is overlapped with the direction of eye cornea astigmatism refractive power maximum.Studies show that, when Toric type artificial intraocular lenses axially with the axial location rotation of eye cornea during over 5 °, Toric type artificial intraocular lenses will lose the correcting to astigmatism.Therefore for the those skilled in the art, Toric face and axial labelling ideal position thereof should be positioned at artificial intraocular lenses's front surface (anterior chamber's direction).Although yet in prior art, the complex loop curved surface is placed on the artificial intraocular lenses rear surface and can makes artificial intraocular lenses's optical quality perform to the best the design that aspheric surface is placed on artificial intraocular lenses's front surface, but when also having sacrificed doctor's implantable artificial crystal to the identification of Toric bearing mark, can affect so the countershaft accurate judgement to the position of doctor in operation, in the increase operation, crystal axis is to the difficulty and the probability that error occurs of position alignment.In addition, in prior art, aspheric surface is combined with the complex loop curved surface and is placed on a part of optical quality that artificial intraocular lenses's front surface can be sacrificed the artificial intraocular lenses, reduce aspheric surface to the correcting of spherical aberration, the intraocular lens optic performance is reduced.
Each artificial crystal production producer generally all can add new design element on existing crystal design in Process of New Product Design, form new design.Such as the design of aspheric intraocular lens is to add the aspheric surface design in the design of protocorm dough figurine work crystal; Aspheric surface Toric type artificial intraocular lenses adds the complex loop curved design on the basis of aspheric surface design.The face shape that the advantage of this design is to keep the side of first processing is constant, only the side of post-treatment is carried out respective change, thereby saves the cost of design, processing, the difficulty of reduction design.Thereby for the technical staff in described field, the design of Toric face is not random, need to consider flow process, cost, complexity etc. the problem of optical property, processing, production.Each company can consider that all each is for the succession between product and continuity when designing new artificial intraocular lenses.
Therefore, those skilled in the art wishes to obtain a kind of spherical aberration and the higher order aberratons that can either evenly correct artificial intraocular lenses's eye in astigmatism, improve image quality, the astigmatism correction type artificial intraocular lenses of the rotation error in the time of can reducing artificial intraocular lenses's Operation again.
The utility model content
This utility model proposes in view of the above problems, its purpose is to provide a kind of spherical aberration and the higher order aberratons that can either evenly correct artificial intraocular lenses's eye in astigmatism, improve image quality, the astigmatism correction type artificial intraocular lenses of the rotation error in the time of can reducing artificial intraocular lenses's Operation again.
Term definition
The term " opticator " that uses in this application is to be made of artificial intraocular lenses's optic and optic edge.
Thereby the term " optic " that uses in this application refer to is positioned at the part that optical characteristics can realize regulating the dioptric major function of artificial intraocular lenses that has at intraocular lens optic part center.Particularly, the diameter of the artificial intraocular lenses's who uses in this utility model embodiment opticator is approximately 6 millimeters, and wherein optic refers to 5.0 millimeters of artificial intraocular lenses's bores with interior part.
The term " optic edge " that uses in this application refer to be arranged on intraocular lens optic section periphery can not affect the marginal area of artificial intraocular lenses's optical characteristics.Particularly, the diameter of the artificial intraocular lenses's who uses in this utility model embodiment opticator is approximately 6 millimeters, wherein the optic edge refers to the optic marginal portion outside 2.5 millimeters, optic center (or artificial intraocular lenses's bore 5.0 millimeters), as shown in drawing reference numeral in Fig. 24.Those skilled in the art's easy to understand: for for the artificial intraocular lenses of other size, the optic edge correspondingly may be different apart from the distance at optic center for optic diameter.
The optic surface that the term " optic rear surface " that uses in this application contacts with capsule after human eye after referring in the artificial intraocular lenses is implanted human eye.
After the term " anterior optic surface " that uses in this application refers in the artificial intraocular lenses is implanted human eye, relative with the optic rear surface optic that capsule arranges after the human eye is surperficial.
The term " button loop " that uses in this application refer to intraocular lens optic partly be connected, not only played support of optical partly effect but also play the part that contractility that contraction and varicose with ciliary muscle produce is delivered to the effect of described opticator.
Use in this application the term for example " front " of expression position relation, " afterwards " is for the distance of capsule after human eye.For example, for astigmatism correction type artificial intraocular lenses of the present utility model, " optic rear surface " is the optical surface nearer apart from capsule after human eye than " anterior optic surface ".
Use in this application the term for example " protruding " of expression shape, " recessed " is for the longitudinal median plane of intraocular lens optic part.For example, " artificial intraocular lenses of rear convex form " means on this artificial intraocular lenses's optic rear surface far away apart from the distance of the longitudinal median plane of the nearer point of this centre of surface and this intraocular lens optic part.
Owing to the astigmatism correction type artificial intraocular lenses's of described optic rear surface with high order aspheric surface design anterior optic surface or intraocular lens optic section rear surface in this application protruding forward or backward respectively, the central point on the term " optic surface vertices " that therefore uses in this application refers to that anterior optic surface that described artificial intraocular lenses protrudes or described artificial intraocular lenses protrude optic rear surface.Also can say, the optic surface vertices refers to: the anterior optic surface that described artificial intraocular lenses is protruded protrude forward and and the distance point farthest between the longitudinal median plane of this intraocular lens optic part; Perhaps the described artificial intraocular lenses optic rear surface of protruding protrude backward and and the distance point farthest between the longitudinal median plane of this intraocular lens optic part.
Has the complex loop curved design on anterior optic surface due to the astigmatism correction type artificial intraocular lenses described in the application, and artificial intraocular lenses's anterior optic surface is protruded forward, therefore for the astigmatism correction type artificial intraocular lenses in the application, the term that uses in the application " anterior optic surface summit " refers to the central point on the anterior optic surface that described artificial intraocular lenses protrudes.Also can say, the anterior optic surface summit refers to: the anterior optic surface that described artificial intraocular lenses is protruded protrude forward and and the distance point farthest between the longitudinal median plane of this intraocular lens optic part.
The term " button loop type angle " that uses in this application refers to astigmatism correction type artificial intraocular lenses of the present utility model and is in (in not implanted human eye) under not stressed free state, the longitudinal centre line of button loop also can be known as " design angle of button loop " in this application with respect to the angle that is with the perpendicular vertical line of human eye axis (or longitudinal median plane of intraocular lens optic part).
According to an aspect of the present utility model, a kind of astigmatism correction type artificial intraocular lenses is provided, described astigmatism correction type artificial intraocular lenses comprises: the opticator that is made of optic and optic edge; At least two buttons loop that are connected with described opticator is characterized in that, the front surface of described optic is the complex loop curved surface; The rear surface of described optic is aspheric surface.
According to another aspect of the present utility model, described complex loop curved surface is convex complex loop curved surface, described convex complex loop curved surface is the basic sphere in 5.5 millimeters-84.0 millimeters scopes and being formed by stacking with respect to the side-play amount of described basic sphere by radius of curvature, two-dimensional coordinate system is set up as initial point in anterior optic surface summit in the described astigmatism correction type artificial intraocular lenses, and the axis of ordinates of described coordinate system (Y) is tangent and by described anterior optic surface summit (O) with described anterior optic surface; The axis of abscissas of described coordinate system (Z) is parallel to axis oculi direction (D-D '), be an angle of 90 degrees with axis of ordinates (Y) and by described anterior optic surface summit (O), the curve of described convex complex loop curved surface on above-mentioned two-dimensional coordinate system plane (YZ) satisfies following formula:
Wherein Z (y) is the expression formula of the curve of described convex complex loop curved surface on the YZ plane of intraocular lens optic section, c is the inverse of the basic sphere surface curvature radius of anterior optic surface, y be on described curve any point apart from the vertical dimension of axis of abscissas (Z), A
2iBe aspheric surface high-order term coefficient, m, n are integer and the n 〉=m more than or equal to 1, and rotate a circle with certain front surface radius of turn (R) forms the each point on described convex complex loop curved surface face shape around the straight line that is parallel to axis of ordinates (Y) (d-d ') by described curve negotiating.
According to another aspect of the present utility model, described aspheric surface is the convex aspheric surface, and the radius of curvature of the aspheric basic sphere of described convex is in 8.0 millimeters-74.0 millimeters scopes.
According to another aspect of the present utility model, described convex aspheric surface adopts the high order aspheric surface design, two-dimensional coordinate system is set up as initial point in the summit, optic rear surface of the employing high order aspheric surface design in the described astigmatism correction type artificial intraocular lenses, and the axis of ordinates of described coordinate system (Y) is tangent and by summit, described optic rear surface (O ') with described optic rear surface; The axis of abscissas of described coordinate system (Z) is parallel to axis oculi direction (D-D '), be an angle of 90 degrees with axis of ordinates (Y) and by summit, described optic rear surface (O '), the curve of described convex aspheric surface on above-mentioned two-dimensional coordinate system plane (YZ) satisfies following high order aspheric surface and design expression formula:
Wherein Z (y) is the expression formula of the curve of aspheric surface on the YZ plane of intraocular lens optic section, and c is the inverse of sphere rear surface, optic basis radius of curvature, y be on described curve any point apart from the vertical dimension of axis of abscissas (Z), A
2iBe aspheric surface high-order term coefficient, m, n are integer and the n 〉=m more than or equal to 1, and the each point on described convex aspheric surface is rotated symmetrical the variation and obtains around axis of abscissas (Z) by described curve negotiating.
According to another aspect of the present utility model, the radius of curvature of the aspheric basic sphere of described convex is less than the radius of curvature of the basic sphere of described convex complex loop curved surface.
According to another aspect of the present utility model, described astigmatism correction type artificial intraocular lenses is that hydrophobic acrylic acid's ester of 1.48 is made by refractive index.
According to another aspect of the present utility model, described button loop can be L shaped button loop or C shape button loop, and the button loop type angle of described button loop is 1.5 °.
According to another aspect of the present utility model, described button loop can be two buttons loop that circumferentially arrange symmetrically around described opticator.
Compare with the artificial intraocular lenses who designs with prior art face shape at present, astigmatism correction type artificial intraocular lenses's of the present utility model optic adopts complex loop curved surface and aspheric surface to live apart in the design of artificial intraocular lenses both sides, particularly, the complex loop curved surface is arranged on the front surface of described optic and aspheric surface is arranged on the rear surface of described optic.Thus, astigmatism correction type artificial intraocular lenses of the present utility model had both facilitated doctor's power of a test to artificial intraocular lenses's axial location in implantation process, reduce the artificial intraocular lenses and implant rotation error, improved again artificial intraocular lenses's optical property, in astigmatism, evenly correct spherical aberration and the higher order aberratons of artificial intraocular lenses's eye, improve image quality.
Description of drawings
According to following accompanying drawing and explanation, feature of the present utility model, advantage will become more clear, wherein:
Fig. 1 schematically shows the basic comprising of human eye dioptric system;
Fig. 2 is the perspective schematic view according to the astigmatism correction type artificial intraocular lenses of an embodiment of the present utility model of observing from artificial intraocular lenses's front surface, and wherein button loop launches and be not folded on the front surface of astigmatism correction type intraocular lens optic part;
Fig. 3 is the perspective schematic view according to the astigmatism correction type artificial intraocular lenses of an embodiment of the present utility model of observing from the artificial intraocular lenses rear surface, and wherein button loop launches and be not folded on the front surface of astigmatism correction type intraocular lens optic part;
Fig. 4 is the profile according to the astigmatism correction type artificial intraocular lenses of an embodiment of the present utility model, and wherein button loop has been folded on the front surface of astigmatism correction type intraocular lens optic part;
Fig. 5 schematically shows according to the intraocular lens optic section surface of the employing high order aspheric surface design of an embodiment of the present utility model and the difference between corresponding spherical surface;
Fig. 6 schematically shows complex loop Surface forming principle;
Fig. 7 schematically shows Toric type artificial intraocular lenses, and the artificial intraocular lenses is axially and the position relationship between eye cornea maximum optical power direction when implanting human eye;
Fig. 8 schematically shows aspheric surface and complex loop curved surface and divides prior art artificial intraocular lenses's (the first comparative example and the second comparative example) that this utility model astigmatism correction type artificial intraocular lenses (the first preferred embodiment and the second preferred embodiment) of occuping both sides and aspheric surface and complex loop curved surface be positioned at the same side the MTF comparison diagram of spatial frequency 0-100lp/mm under the human-eye model of 3.0mm aperture band astigmatism;
Fig. 9 schematically shows the wave front chart (aspheric surface and complex loop curved surface divide occupy both sides) at astigmatism correction type artificial intraocular lenses face shape of the present utility model design image planes place in human-eye model; With
Figure 10 schematically shows prior art aspheric surface and complex loop curved surface and is combined in the wave front chart of face shape design in human-eye model on one side.
Use identical drawing reference numeral to represent same or analogous element in the application's accompanying drawing.
The drawing reference numeral explanation
1 astigmatism correction type artificial intraocular lenses
2 opticators
3 optic
4 optic edges
5 buttons loop
6 anterior optic surface
7 optic rear surfaces
The longitudinal median plane of 8 astigmatism correction type intraocular lens optic parts
9 rear capsules (film)
The 10 axial labellings of Toric type artificial intraocular lenses
11 corneas
12 pouches
D-D ' axis oculi direction
The rotation of d-d ' complex loop curved surface forms axis
E-E ' eye cornea maximum optical power direction
O anterior optic surface summit
Summit, O ' optic rear surface
The R radius of turn
The r radius of curvature.
The specific embodiment
Following specific embodiment just is used for further this utility model being explained further, but this utility model is not limited to following specific embodiments.Any variation on these embodiments bases as long as meet spirit of the present utility model and scope, all will fall in the covering scope of this utility model patent.
It is to need the factor considered in the face shape design of astigmatism correction type intraocular lens optic of the present utility model section to the power of a test of artificial intraocular lenses's axial location in implantation process that the optical property that further improves the artificial intraocular lenses who implants facilitates the doctor simultaneously.
Fig. 2 is the perspective schematic view according to the astigmatism correction type artificial intraocular lenses 1 of an embodiment of the present utility model of observing from artificial intraocular lenses's front surface.Fig. 3 is the perspective schematic view according to the astigmatism correction type artificial intraocular lenses 1 of an embodiment of the present utility model of observing from the artificial intraocular lenses rear surface.As shown in Fig. 2 and Fig. 3, astigmatism correction type artificial intraocular lenses 1 comprises: the opticator 2 that is made of optic 3 and optic the edge 4 or support button loop 5 that be connected integrally formed with described opticator 2 with two.Certainly, the those skilled in the art is understood that the number of described button loop 5 also can more than two, preferably be less than six.Described button loop 5 circumferentially is arranged on symmetrically on optic edge 4 and is connected with the front surface of described opticator 2 around described opticator 2.Certainly, the those skilled in the art is understood that button loop 5 also can circumferentially be arranged on symmetrically on optic edge 4 and be connected with the side of described opticator around described opticator 2.The front surface 6 that the rear surface 7 of described optic 3 has aspheric surface design and described optic 3 has the complex loop curved design.As shown in Fig. 2 and Fig. 3, astigmatism correction type artificial intraocular lenses 1 is in (in not implanted human eye) under not stressed free state, and its button loop 5 is deployed condition and is not folded on the front surface of intraocular lens optic part 2.Button loop 5 can adopt " L " shape button loop or " C " shape button loop, and the button loop type angle of described button loop is 1.5 °.
Fig. 4 is the profile according to the astigmatism correction type artificial intraocular lenses 1 of an embodiment of the present utility model, wherein fastens with a rope, string, etc. 5 to be folded on the front surface of intraocular lens optic part 2.Can more clearly see from this figure: astigmatism correction type artificial intraocular lenses 1 anterior optic surface 6 is the convex aspheric surface for convex complex loop curved surface and optic rear surface 7.
In order to eliminate or reduce the higher order aberratons (comprising spherical aberration and coma) that prior art artificial intraocular lenses product has thus improve image quality, adopted the high order aspheric surface design according to the astigmatism correction type artificial intraocular lenses's 1 of a kind of embodiment of the present utility model optic rear surface, certainly, the those skilled in the art can recognize that also described optic rear surface also can adopt the aspheric surface design of conventional single Q-value.
The aspheric compensation principle of astigmatism correction type intraocular lens optic section of the present utility model is: positive and negative the offseting of spherical aberration that the extra spherical aberration that aspheric surface produces and basic sphere produce, positive and negative the offseting of coma that the extra coma that aspheric surface produces and basic sphere produce.
Various variablees when in the application, the decision design of high order aspheric surface utilizes polynary equation of higher degree coefficient as design, the aspheric surface that produces is more complicated for its basic spherical surface shape.The design of high order aspheric surface can not only be corrected spherical aberration, can also correct the higher order aberratons of other type, reduces crystal to the sensitivity of implantation position.
In order to describe more accurately the face shape of this utility model intraocular lens optic section, as shown in Figure 5, the optic rear surface summit O ' of the employing high order aspheric surface decision design in the astigmatism correction type artificial intraocular lenses of the present utility model sets up two-dimensional coordinate system as initial point.The axis of ordinates Y of described coordinate system and described optic rear surface are tangent and by described optic rear surface summit O '; The axis of abscissas Z of described coordinate system is parallel to the axis oculi direction D-D ' shown in Fig. 4, is an angle of 90 degrees and by described optic rear surface summit O ' with axis of ordinates Y.As the utility model astigmatism correction IOL using the optical part of the high-order aspheric design of each point on the surface of the optical parallel on the surface by the apex O 'the axial direction as shown in Figure 4 D-D 'in the horizontal axis Z was rotationally symmetrical relationship, so long as the plane defined by the vertical axis and the horizontal axis Y Z constituted the utility model IOL astigmatism correction in high-order aspheric coordinate the relationship between the surface of the optical portion of the design, by rotational symmetry transformation of the utility can recover the new IOL astigmatism correction in high-order aspheric optical design of the rear portion of the surface shape of the surface.Each point on the optic rear surface of employing high order aspheric surface in the astigmatism correction type artificial intraocular lenses of the present utility model on the plane that is made of above-mentioned axis of ordinates Y and axis of abscissas Z design can be expressed as (Z, y).As shown in Figure 5,
Be the Z value of any point of aspheric surface on the curve on two-dimensional coordinate system plane YZ,
Z value for any point of spherical surface shape on two-dimensional coordinate system plane YZ.
The curve of aspheric surface on above-mentioned two-dimensional coordinate system plane YZ of astigmatism correction type intraocular lens optic section of the present utility model rear surface satisfies following high order aspheric surface design expression formula (1):
Wherein Z (y) is the expression formula of the curve of aspheric surface on the YZ plane of astigmatism correction type intraocular lens optic section, and c is the inverse of sphere rear surface, optic basis radius of curvature, y be on described curve any point apart from the vertical dimension of axis of abscissas Z, A
2iBe aspheric surface high-order term coefficient, m, n are integer and the n 〉=m more than or equal to 1, have reflected the gap size of aspheric surface and basic spherical surface shape by these.By above formula as seen, high order aspheric surface can be regarded as basic sphere item
With the stack of bias, aspheric surface high-order term coefficient wherein
Be the stack item.
Each point on described high order aspheric surface face shape is rotated symmetrical the variation and obtains around axis of abscissas Z by described curve negotiating.
In order to describe more accurately the face shape of this utility model intraocular lens optic section, as shown in Figure 6, anterior optic surface summit O in the astigmatism correction type artificial intraocular lenses of the present utility model sets up two-dimensional coordinate system as initial point, and the axis of ordinates Y of described coordinate system and described anterior optic surface are tangent and by described anterior optic surface summit O; The axis of abscissas Z of described coordinate system is parallel to axis oculi direction D-D ', is an angle of 90 degrees and by described anterior optic surface summit O, the curve of described convex complex loop curved surface on above-mentioned two-dimensional coordinate system plane YZ satisfies following formula (2) with axis of ordinates Y:
（2）
Wherein Z (y) is the expression formula of the curve of described convex complex loop curved surface on the YZ plane of intraocular lens optic section, c is the inverse of the basic sphere surface curvature radius of anterior optic surface, y be on described curve any point apart from the vertical dimension of axis of abscissas Z, A
2iBe aspheric surface high-order term coefficient, m, n are integer and the n 〉=m more than or equal to 1, and the each point on described convex complex loop curved surface face shape is rotated a circle with certain front surface radius of turn R around the straight line d-d ' that is parallel to axis of ordinates Y by described curve negotiating and forms.
The characteristics of this complex loop curved surface are: in the horizontal direction with vertical direction on refractive power vary in size, the refractive power of vertical direction is determined by the radius of curvature of rotating curve, the refractive power of horizontal direction by Curves around the front surface radius of turn determine, in the horizontal direction with vertical direction between refractive power becomes the decision of face shape by curve rotation institute.This complex loop curved surface face shape power profile effect is equal to the combination of basic sphere and cylinder.
Following table 1 has been listed the first preferred embodiment of astigmatism correction type artificial intraocular lenses 1 of the present utility model and the face shape design parameter of the second preferred embodiment and prior art the first comparative example and the second comparative example.The first preferred embodiment of astigmatism correction type artificial intraocular lenses 1 of the present utility model and the second preferred embodiment and prior art the first comparative example and the second comparative example makes by hydrophobic acrylic acid's ester and this material is obtained by Aibo Nuode (Beijing) Medical Technology Co., Ltd..The refractive index of this astigmatism correction type artificial crystal material is 1.48(20 ℃).The refractive index of this material is moderate, can effectively reduce the incidence rate of dazzle, ghost phenomenon.In addition, the center thickness of the astigmatism correction type artificial intraocular lenses's 1 of this utility model following examples optic is 0.825 millimeter." center thickness of optic " refers to the thickness in astigmatism correction type artificial intraocular lenses's of the present utility model thickness, optic centre.The astigmatism correction type artificial intraocular lenses 1 of this utility model following examples all can reach the diopter (extra-column mirror degree is 2.5D) of 20.0D.In table 1, Ra is artificial intraocular lenses's front surface radius of curvature (unit is millimeter), Rp is artificial intraocular lenses's rear surface radius of curvature (unit is millimeter), radius of curvature numerical value is that positive number represents that this surface is evagination for the longitudinal median plane of intraocular lens optic part, and A4, A6, A8, A10 are the aspheric coefficient value of artificial intraocular lenses (in conjunction with referring to top expression formula 1 and 2).The radius of curvature of astigmatism correction type artificial intraocular lenses of the present utility model 1 front surface is in 5.5 millimeters-84.0 millimeters scopes, and the radius of curvature of astigmatism correction type artificial intraocular lenses of the present utility model 1 front surface is in 8.0 millimeters-74.0 millimeters scopes.
Table 1
| Ra | Rp | A4 | A6 | A8 | A10 | |
| The first preferred embodiment | 13.65 | 13.65 | 8.13E-004 | -1.25E-006 | -8.00E-006 | 4.81E-007 |
| The first comparative example | 13.65 | 13.65 | -2.77E-003 | 9.72E-004 | -1.79E-004 | 1.19E-005 |
| The second preferred embodiment | 18.46 | 11.1 | 6.46E-004 | 9.86E-005 | -2.19E-005 | 1.12E-006 |
| The second comparative example | 18.46 | 11.1 | -1.85E-004 | -2.14E-004 | 3.27E-005 | -1.47E-006 |
Can be seen by table 1: the first preferred embodiment of astigmatism correction type artificial intraocular lenses 1 of the present utility model and prior art the first comparative example all have the face shape design of the biconvexs such as optic front and rear surfaces; The second preferred embodiment of astigmatism correction type artificial intraocular lenses 1 of the present utility model and prior art the second comparative example all have the obviously rear protruding face shape design of optic rear surface.For particularly obviously rear protruding face shape is designed for intraocular lens optic section rear surface, L shaped button loop of the present utility model or C shape button loop can form 3 robust structure with the high rear protruding rear surface of astigmatism correction type artificial intraocular lenses 1 of the present utility model, thereby be conducive to the positional stability of artificial intraocular lenses in rear capsule, and can effectively reduce the sickness rate that the artificial intraocular lenses implants rear secondary cataract (PCO).
Can also be seen by table 1: in astigmatism correction type artificial intraocular lenses's 1 of the present utility model the first preferred embodiment and the second preferred embodiment, the complex loop curved surface is on intraocular lens optic section front surface and aspheric surface all is on intraocular lens optic section rear surface; And in the first comparative example and the second comparative example, complex loop curved surface and aspheric surface all are on intraocular lens optic section front surface.
Fig. 7 schematically shows Toric type artificial intraocular lenses, and the artificial intraocular lenses is axially and the position relationship between eye cornea maximum optical power direction when implanting human eye.When implanting human eye the artificial intraocular lenses axially with eye cornea 11 maximum optical power direction E-E ' between during the difference of generation more than 5 °, patient's vision will be had a strong impact on.Therefore, the easy identification of bearing mark on the Toric face, distinct be operation process to the objective requirement of Toric type artificial intraocular lenses design.This shows, in astigmatism correction type artificial intraocular lenses's 1 of the present utility model the first preferred embodiment and the second preferred embodiment, it is very favorable that the complex loop curved surface is arranged on intraocular lens optic section front surface.
Fig. 8 schematically shows aspheric surface and complex loop curved surface and divides artificial intraocular lenses's (the first comparative example and the second comparative example) that artificial intraocular lenses's (the first preferred embodiment and the second preferred embodiment) of occuping both sides and aspheric surface and complex loop curved surface be positioned at the same side the MTF comparison diagram of spatial frequency 0-100lp/mm under the human-eye model of 3.0mm aperture band astigmatism.
In Fig. 8, solid line is that aspheric surface and Toric face divide artificial intraocular lenses's (the first preferred embodiment and the second preferred embodiment) of occuping the crystal both sides MTF of spatial frequency 0-100lp/mm under the human-eye model of 3.0mm aperture band astigmatism; The MTF of the dotted line spatial frequency 0-100lp/mm that is aspheric surface and Toric face artificial intraocular lenses's (the first comparative example and the second comparative example) of being positioned at crystal the same side under the human-eye model of 3.0mm aperture band astigmatism.As can be seen from the figure, the separation of aspheric surface and Toric face is positioned at the artificial intraocular lenses's of crystal the same side MTF higher than aspheric surface and Toric face at the artificial intraocular lenses's of crystal both sides MTF curve, show that (be in same astigmatic human-eye model, asphericity coefficient all passes through optimum optimization) aspheric surface and Toric face separation under the same conditions is better than in the artificial intraocular lenses's of crystal both sides optical property the artificial intraocular lenses that aspheric surface and Toric face are positioned at crystal the same side.
Fig. 9 schematically shows the wave front chart (the first preferred embodiment and the second preferred embodiment, aspheric surface and complex loop curved surface divide occupy artificial intraocular lenses both sides) at astigmatism correction type artificial intraocular lenses face shape of the present utility model design image planes place in human-eye model; Figure 10 schematically shows prior art aspheric surface and complex loop curved surface and is combined in face shape design (the first comparative example and the second comparative example) wave front chart in same human-eye model on one side.
Wave front aberration in comparison diagram 9, Figure 10 can see, the artificial intraocular lenses that the complex loop curved surface separates with aspheric surface image planes wavefront astigmatism shape in astigmatism rises and falls less, wave front aberration PV value 0.1060 λ, RMS value 0.0241 λ; And complex loop curved surface and aspheric surface are combined in the design image planes of one side and exist obvious astigmatic shape to rise and fall, wave front aberration PV value 0.3331 λ, RMS value 0.0700 λ.Prove thus the astigmatism correction better effects if of artificial intraocular lenses's corneal that the complex loop curved surface separates with aspheric surface, correct the front aberration of postwave less.
In sum, compare with the astigmatism correction type artificial intraocular lenses who designs with prior art face shape at present, in astigmatism correction type artificial intraocular lenses of the present utility model, the complex loop curved surface is arranged on the front surface of described optic and aspheric surface is arranged on the rear surface of described optic.Make thus, astigmatism correction type artificial intraocular lenses of the present utility model had both facilitated doctor's power of a test to artificial intraocular lenses's axial location in implantation process, reduce the artificial intraocular lenses and implant rotation error, improved again artificial intraocular lenses's optical property, in astigmatism, evenly correct spherical aberration and the higher order aberratons of artificial intraocular lenses's eye, improve image quality.
Embodiment described in preamble is only illustrative rather than restrictive.Therefore, in the situation that do not break away from utility model design disclosed herein, the 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. astigmatism correction type artificial intraocular lenses, described astigmatism correction type artificial intraocular lenses comprises:
The opticator that is consisted of by optic and optic edge;
At least two buttons loop that are connected with described opticator,
It is characterized in that,
The front surface of described optic is the complex loop curved surface;
The rear surface of described optic is aspheric surface.
2. astigmatism correction type artificial intraocular lenses according to claim 1, it is characterized in that, described complex loop curved surface is convex complex loop curved surface, described convex complex loop curved surface is the basic sphere in 5.5 millimeters-84.0 millimeters scopes and being formed by stacking with respect to the side-play amount of described basic sphere by radius of curvature
Two-dimensional coordinate system is set up as initial point in anterior optic surface summit (O) in the described astigmatism correction type artificial intraocular lenses, and the axis of ordinates of described coordinate system (Y) is tangent and by described anterior optic surface summit (O) with described anterior optic surface; The axis of abscissas of described coordinate system (Z) is parallel to axis oculi direction (D-D '), be an angle of 90 degrees with axis of ordinates (Y) and by described anterior optic surface summit (O), the curve of described convex complex loop curved surface on above-mentioned two-dimensional coordinate system plane (YZ) satisfies following formula:
Wherein Z (y) is the expression formula of the curve of described convex complex loop curved surface on the YZ plane of intraocular lens optic section, c is the inverse of the basic sphere surface curvature radius of anterior optic surface, y be on described curve any point apart from the vertical dimension of axis of abscissas (Z), A
2iBe aspheric surface high-order term coefficient, m, n are integer and the n 〉=m more than or equal to 1,
Rotate a circle with certain front surface radius of turn (R) forms each point on described convex complex loop curved surface face shape around the straight line that is parallel to axis of ordinates (Y) (d-d ') by described curve negotiating.
3. astigmatism correction type artificial intraocular lenses according to claim 1, is characterized in that, described aspheric surface is the convex aspheric surface, and the radius of curvature of the aspheric basic sphere of described convex is in 8.0 millimeters-74.0 millimeters scopes.
4. astigmatism correction type artificial intraocular lenses according to claim 3, is characterized in that, described convex aspheric surface adopts the high order aspheric surface design,
Two-dimensional coordinate system is set up as initial point in the summit, optic rear surface of the employing high order aspheric surface design in the described astigmatism correction type artificial intraocular lenses, and the axis of ordinates of described coordinate system (Y) is tangent and by summit, described optic rear surface (O ') with described optic rear surface; The axis of abscissas of described coordinate system (Z) is parallel to axis oculi direction (D-D '), be an angle of 90 degrees with axis of ordinates (Y) and by summit, described optic rear surface (O '), the curve of described convex aspheric surface on above-mentioned two-dimensional coordinate system plane (YZ) satisfies following high order aspheric surface and design expression formula:
Wherein Z (y) is the expression formula of the curve of aspheric surface on the YZ plane of intraocular lens optic section, and c is the inverse of sphere rear surface, optic basis radius of curvature, y be on described curve any point apart from the vertical dimension of axis of abscissas (Z), A
2iBe aspheric surface high-order term coefficient, m, n are integer and the n 〉=m more than or equal to 1,
Each point on described convex aspheric surface is rotated symmetrical the variation and obtains around axis of abscissas (Z) by described curve negotiating.
5. astigmatism correction type artificial intraocular lenses according to claim 4, is characterized in that, the radius of curvature of the aspheric basic sphere of described convex is less than the radius of curvature of the basic sphere of described convex complex loop curved surface.
6. the described astigmatism correction type of any one artificial intraocular lenses according to claim 1-5, is characterized in that, described astigmatism correction type artificial intraocular lenses is that hydrophobic acrylic acid's ester of 1.48 is made by refractive index.
7. the described astigmatism correction type of any one artificial intraocular lenses according to claim 1-5, is characterized in that, described button loop is L shaped button loop or C shape button loop, and the button loop type angle of described button loop is 1.5 °.
8. astigmatism correction type artificial intraocular lenses according to claim 7, is characterized in that, described button loop is two buttons loop that circumferentially arrange symmetrically around described opticator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201220462677.3U CN202920413U (en) | 2012-09-12 | 2012-09-12 | Astigmatism corrective intraocular lens |
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| CN201220462677.3U CN202920413U (en) | 2012-09-12 | 2012-09-12 | Astigmatism corrective intraocular lens |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103655001A (en) * | 2012-09-12 | 2014-03-26 | 爱博诺德（北京）医疗科技有限公司 | Astigmatism correction type artificial lens |
| CN104127262A (en) * | 2013-11-27 | 2014-11-05 | 爱博诺德（北京）医疗科技有限公司 | Astigmatism-correcting intraocular lens and design and production methods thereof |
| CN106388974A (en) * | 2016-12-09 | 2017-02-15 | 天津世纪康泰生物医学工程有限公司 | Aspherical artificial lens capable of completely correcting mesopic vision |
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2012
- 2012-09-12 CN CN201220462677.3U patent/CN202920413U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103655001A (en) * | 2012-09-12 | 2014-03-26 | 爱博诺德（北京）医疗科技有限公司 | Astigmatism correction type artificial lens |
| CN104127262A (en) * | 2013-11-27 | 2014-11-05 | 爱博诺德（北京）医疗科技有限公司 | Astigmatism-correcting intraocular lens and design and production methods thereof |
| WO2015078271A1 (en) * | 2013-11-27 | 2015-06-04 | 爱博诺德（北京）医疗科技有限公司 | Astigmatism-correcting intraocular lens and design and production methods therefor |
| CN104127262B (en) * | 2013-11-27 | 2016-07-27 | 爱博诺德（北京）医疗科技有限公司 | Astigmatism correction type artificial intraocular lenses and design thereof and production method |
| CN106388974A (en) * | 2016-12-09 | 2017-02-15 | 天津世纪康泰生物医学工程有限公司 | Aspherical artificial lens capable of completely correcting mesopic vision |
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