CN104127263A - Multi-focus artificial lens - Google Patents
Multi-focus artificial lens Download PDFInfo
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- CN104127263A CN104127263A CN201310700805.2A CN201310700805A CN104127263A CN 104127263 A CN104127263 A CN 104127263A CN 201310700805 A CN201310700805 A CN 201310700805A CN 104127263 A CN104127263 A CN 104127263A
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Abstract
The invention relates to a multi-focus artificial lens which comprises an optical part formed by an optical portion and an optical part edge. 6-35 diffraction slope rings are arranged on the front surface and/or the rear surface of the optical portion in a mirror symmetry manner according to the optical axis of the multi-focus artificial lens, a starting border position of the first diffraction slope ring is 0.580-0.520mm while a finishing border position of the same is 0.815-0.735mm, and feature size of the first diffraction slope ring is 0.125-0.048, so that color difference of the multi-focus artificial lens is enabled to be zero. Imaging quality of the multi-focus artificial lens under the condition of polychromatic light is improved, and characteristics of resisting inclination and decentration are enhanced, so that acquiring of super sight is facilitated.
Description
Technical field
The present invention relates generally to the design field of multifocal intraocular lenses.Particularly, the present invention relates to the diffractive multifocal intraocular lenses that a kind of self aberration is zero.
Background technology
Multifocal intraocular lenses is a kind of artificial lens that can implant ophthalmic.For those skilled in the art, carrying out diffractive designs on monofocal intraocular lens surface is to realize a kind of technological means that multifocal intraocular lenses adopts conventionally, and the multifocal intraocular lenses designed by this technological means is called as diffractive multifocal intraocular lenses.Diffractive multifocal intraocular lenses be therein on an optical surface etching some there is the micro-slope ring of the concentric circular character of diffracting power, these micro-slope rings can make the light that enters human eye form far and near two focuses simultaneously, and the position of perifocus is determined by additional optical focal power.Fig. 1 is the schematic plan of the diffractive multifocal intraocular lenses 1 observed from a kind of diffractive multifocal intraocular lenses optic rear surface direction of prior art.As shown in Figure 1, the form of diffractive multifocal intraocular lenses 1, is normally made up of a circular opticator 2 and the support button loop 5 that is arranged on opticator 2 peripheries.The opticator 2 of diffractive multifocal intraocular lenses 1 is made up of optic (or efficient light school district) 3 and optic edge 4, is provided with diffraction slope ring 8 on optic rear surface 6.
Cataract patient is removed cataract and is implanted multifocal intraocular lenses by refrangibility cataract operation, recovered postoperative depending near, look the physiological visual function such as far away, photopic vision power and scotopia, its image quality is not only subject to monochromatic aberration as the impact of the factors such as spherical aberration, coma, astigmatism, is also subject to the impact of aberration.People is daily to live in natural environment, the light source receiving is mainly white light, and its monochromatic light by different wave length forms, and the monochromatic light of different wave length is refractive index difference in same optical medium, cause the monochromatic light of different wave length to have different focal powers, this phenomenon is called aberration.Aberration makes the focus size of imaging on retina and position change along with the variation of wavelength, thereby can greatly reduce the quality of polychromatic light object imaging on human eye retina.
Here illustrate, when light is injected into the different material of another kind of optical density by a kind of material, the direction of propagation of its light produces deviation, and this phenomenon is called dioptric phenomenon, diopter represents the size (refractive power) of this dioptric phenomenon, and unit is diopter (being abbreviated as " D ").1D refractive power is equivalent to parallel rays to be focused on 1 meter of focal length.The effect of the eyes refracted ray light of complaining about being wronged, represents by focal power the ability of dioptric to be also called diopter.Diopter is the refractive intensity of lens for light.Diopter is the size unit of refractive power, represents with D, has both referred to that parallel rays is through this refractive material, and becoming the refractive power of focus this refractive material in the time of 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, the focal length that wherein f is lens, in formula: dioptric unit of force is diopter, symbol is D, dimension is L
-1, 1D=1m
-1.
Representative diffractive multifocal intraocular lenses has the ReSTOR Multifocal IOL of U.S. Ai Erkang (Alcon) and the TECNIS Multifocal IOL of Allergan (AMO) in the market.The ReSTOR Multifocal IOL refractive index of Alcon is 1.55, and additional optical focal power has 3D(1D, 1 diopter) and two kinds of 4D, crystalline lens self has positive aberration; The TECNIS Multifocal IOL of U.S.'s Allergan (AMO), refractive index is 1.47, and additional optical focal power is 4D, and this crystalline lens self has negative aberration.
As can be seen here, on market, existing diffractive multifocal intraocular lenses itself, all with certain positive aberration or negative aberration, and then reduces the quality of optical imaging under polychromatic light condition; In addition, because the intraocular lens self of prior art is all with certain aberration, therefore its antagonism tilt and eccentric ability poor.
Along with the development of monochromatic aberration correcting technology, the importance of aberration constantly manifests, and becomes gradually the obstacle that must overcome that obtains Extra Vision.Thereby how by intraocular lens's product being designed to the quality that can improve polychromatic light object imaging on human eye retina, will become the problem that those skilled in the art more and more pays close attention to.
Summary of the invention
The present invention proposes in view of existing the problems referred to above in prior art.It is zero that inventor designs to make the aberration of described multifocal intraocular lenses self by the optic surface to multifocal intraocular lenses innovatively, its object is to improve the image quality of multifocal intraocular lenses under polychromatic light condition, strengthen anti-inclination and eccentric characteristic, thereby obtain Extra Vision.
Term definition
The term " optic " (also can being called " efficient light school district ") thereby refer to using is in this application positioned at having optical characteristics and can realizing the part that regulates the dioptric major function of intraocular lens of intraocular lens's opticator center.For example, the diameter of the intraocular lens's who uses in the embodiment of the present invention opticator is approximately 6 millimeters, and wherein optic refers to 5.0 millimeters of intraocular lens's bores with interior part.Certainly those skilled in the art's easy to understand: for the intraocular lens who is other size for the diameter of opticator, the related intraocular lens's caliber size of optic correspondingly may be different, for example, be likely slightly larger than 5.0 millimeters.
The term " optic edge " using in this application refers to the marginal area that can not affect intraocular lens's optical characteristics that is arranged on intraocular lens's optic periphery.For example, the diameter of the intraocular lens's who uses in the embodiment of the present invention opticator is approximately 6 millimeters, and wherein optic edge refers to apart from the circumferential edge part outside 2.5 millimeters, optic center (or intraocular lens's bore 5.0 millimeters).Those skilled in the art's easy to understand: for the intraocular lens who is other size for optic diameter, optic edge correspondingly may be different apart from the distance at optic center.
The term " anterior optic surface " using in this application refers to tailing edge axis oculi direction that intraocular lens optic surface nearer apart from eye cornea in intraocular lens is implanted to human eye.
The term " optic rear surface " using in this application refers to that intraocular lens's optic surface relative with above-mentioned intraocular lens's anterior optic surface in intraocular lens.
The term " button loop " using in this application or " support fasten with a rope, string, etc. " refer to intraocular lens's opticator and are connected, have not only played the effect of support of optical part but also play the contractility that the contraction of ciliary muscle and varicose are produced the structure that is delivered to the effect of described opticator.
Use in this application and represent that the term for example " protruding " of shape, " recessed " are for longitudinally (along intraocular lens's length direction) central plane of intraocular lens's optic.
The term " described diffraction slope ring ring width " using in this application refers in optic, and the end boundary position of a certain definite diffraction slope ring and initial boundary position are poor apart from the vertical dimension of optical axis AO.
The term " the first diffraction slope ring " using in this application refers in the ring of multiple diffraction slope of optic, that diffraction slope ring nearest apart from optical axis AO.
The term " the initial boundary position of the first diffraction slope ring " using in this application refers to the minimum perpendicular distance of the first diffraction slope ring apart from optical axis AO.
The term " the end boundary position of the first diffraction slope ring " using in this application refers to the maximum normal distance of the first diffraction slope ring apart from optical axis AO.
The term " characteristic size of described diffraction slope ring " using in this application refers on multiple diffraction slope of optic and encircles in corresponding ring width, the minimum ring width of diffraction slope ring.
Particularly, the present invention relates to the content of following many aspects:
1. a multifocal intraocular lenses, described multifocal intraocular lenses comprises the opticator being made up of optic and optic edge,
It is characterized in that,
On anterior optic surface and/or optic rear surface, about the optical axis mirror image of described multifocal intraocular lenses, diffraction slope ring is set symmetrically, the quantity of described diffraction slope ring is between 6-35, wherein the initial boundary position of the first diffraction slope ring is between 0.580-0.520 mm, the end boundary position of the first diffraction slope ring is between 0.815-0.735mm, and the characteristic size of described diffraction slope ring is between 0.125-0.048mm, is zero thereby make the aberration of described multifocal intraocular lenses self.
2. according to the multifocal intraocular lenses described in aspect 1, it is characterized in that, described multifocal intraocular lenses depending on distance vision acuity scope be-10-34D and additional optical power range are 3.05-3.95D.
3. according to the multifocal intraocular lenses described in aspect 1, it is characterized in that, described multifocal intraocular lenses be that 6-34D and additional optical power range are 3.10-3.80D depending on distance vision acuity scope.
4. according to the multifocal intraocular lenses described in aspect 1, it is characterized in that, the quantity of described diffraction slope ring is between 6-30, wherein the initial boundary position of the first diffraction slope ring is between 0.575-0.522mm, the end boundary position of the first diffraction slope ring is between 0.810-0.745mm, and the characteristic size of described diffraction slope ring is between 0.124-0.051mm.
5. according to the multifocal intraocular lenses described in any one in aforementioned aspect 1-4, it is characterized in that, the refractive index of preparing material of described multifocal intraocular lenses is between 1.41 to 1.52.
6. according to the multifocal intraocular lenses described in aspect 5, it is characterized in that, described multifocal intraocular lenses is single type intraocular lens or three-member type intraocular lens.
7. according to the multifocal intraocular lenses described in aspect 5, it is characterized in that, the material of preparing of described multifocal intraocular lenses is silica gel, hydrogel, hydrophilic acrylate, hydrophobic acrylic acid's ester or polymethyl methacrylate.
The present invention has following beneficial effect especially:
The multifocal intraocular lenses with zero color difference characteristic of the present invention has improved the image quality of multifocal intraocular lenses under polychromatic light condition, strengthens anti-inclination and eccentric characteristic, thereby is conducive to obtain Extra Vision.
Brief description of the drawings
According to following accompanying drawing and explanation, feature of the present invention, advantage will become more clear, wherein:
Fig. 1 is the schematic plan of the diffractive multifocal intraocular lenses observed from a kind of diffractive multifocal intraocular lenses optic rear surface direction of prior art, and wherein button loop launches and is not folded on the surface of diffractive multifocal intraocular lenses optic;
Fig. 2 is according to the sectional view of the multifocal intraocular lenses with zero color difference characteristic of an example of the present invention;
Fig. 3 is the multifocal intraocular lenses with zero color difference characteristic according to a first advantageous embodiment of the invention optical path difference (Optical path difference, the OPD) schematic diagram under 6mm clear aperature near vision polychromatic light condition;
Fig. 4 is modulation transfer function (Modulation transfer function, the MTF) curve synoptic diagram of multifocal intraocular lenses shown in Fig. 3 under near vision polychromatic light condition;
Fig. 5 is the optical path difference schematic diagram of the multifocal intraocular lenses with zero color difference characteristic according to a second, preferred embodiment of the present invention under 6mm clear aperature near vision polychromatic light condition;
Fig. 6 is the MTF curve synoptic diagram of multifocal intraocular lenses shown in Fig. 5 under near vision polychromatic light condition;
Fig. 7 is the optical path difference schematic diagram under 6mm clear aperature near vision polychromatic light condition according to the multifocal intraocular lenses with zero color difference characteristic of the 3rd preferred embodiment of the present invention;
Fig. 8 is the MTF curve synoptic diagram of multifocal intraocular lenses shown in Fig. 7 under near vision polychromatic light condition;
Fig. 9 is the optical path difference schematic diagram under 6mm clear aperature near vision polychromatic light condition according to the multifocal intraocular lenses with zero color difference characteristic of the 4th preferred embodiment of the present invention;
Figure 10 is the MTF curve synoptic diagram of multifocal intraocular lenses shown in Fig. 9 under near vision polychromatic light condition;
Figure 11 is the have multifocal intraocular lenses of zero color difference and the MTF correlation curve of the multifocal intraocular lenses with positive aberration and negative aberration of prior art under 6mm clear aperature near vision polychromatic light condition of the present invention, and wherein curve A shows the MTF of zero color difference intraocular lens under near vision polychromatic light diffraction limit condition; Curve B shows the MTF of zero color difference intraocular lens under near vision polychromatic light condition; Curve C shows the MTF of the poor intraocular lens of the normsl skin color under near vision polychromatic light condition; Curve D shows the MTF of negative aberration intraocular lens under near vision polychromatic light condition;
Figure 12 be the multifocal intraocular lenses with zero color difference of the present invention and prior art there is positive aberration and the negative aberration multifocal intraocular lenses MTF correlation curve under eccentric 0.3mm and 0.7mm condition under near vision polychromatic light condition, wherein curve A shows the MTF of zero color difference intraocular lens under near vision polychromatic light condition without acceptance of persons; Curve B shows the MTF of zero color difference intraocular lens under eccentric 0.3mm near vision polychromatic light part; Curve C shows the MTF of the poor intraocular lens of the normsl skin color under the eccentric 0.3mm polychromatic light of near vision condition; Curve D shows the MTF of negative aberration intraocular lens under the eccentric 0.3mm polychromatic light of near vision condition; Curve E shows the MTF of zero color difference intraocular lens under the eccentric 0.7mm polychromatic light of near vision condition; Curve F shows the MTF of the poor intraocular lens of the normsl skin color under the eccentric 0.7mm polychromatic light of near vision condition; Curve G shows the MTF of negative aberration intraocular lens under the eccentric 0.7mm polychromatic light of near vision condition;
Figure 13 is the MTF correlation curve that positive aberration and negative aberration multifocal intraocular lenses tilt under 1 °, 3 °, 5 ° and 7 ° of polychromatic light conditions in 6mm clear aperature near vision that has of the multifocal intraocular lenses with zero color difference of the present invention and prior art, wherein curve A show zero color difference intraocular lens near vision without the MTF under inclination polychromatic light condition; Curve B shows the MTF that zero color difference intraocular lens tilts under 1 ° of polychromatic light condition near vision; Curve C shows the MTF that the poor intraocular lens of the normsl skin color tilts under 1 ° of polychromatic light condition near vision; Curve D shows the MTF that negative aberration intraocular lens tilts under 1 ° of polychromatic light condition near vision; Curve E shows the MTF that zero color difference intraocular lens tilts under 3 ° of polychromatic light conditions near vision; Curve F shows the MTF that the poor intraocular lens of the normsl skin color tilts under 3 ° of polychromatic light conditions near vision; Curve G shows the MTF that negative aberration intraocular lens tilts under 3 ° of polychromatic light conditions near vision; Curve H shows the MTF that zero color difference intraocular lens tilts under 5 ° of polychromatic light conditions near vision; Curve N shows the MTF that the poor intraocular lens of the normsl skin color tilts under 5 ° of polychromatic light conditions near vision; Curve J shows the MTF that negative aberration intraocular lens tilts under 5 ° of polychromatic light conditions near vision; Curve K shows the MTF that zero color difference intraocular lens tilts under 7 ° of polychromatic light conditions near vision; Curve L shows the MTF that the poor intraocular lens of the normsl skin color tilts under 7 ° of polychromatic light conditions near vision; Curve M shows the MTF that negative aberration intraocular lens tilts under 7 ° of polychromatic light conditions near vision.
In the application's accompanying drawing, use identical drawing reference numeral to represent same or analogous element.
Drawing reference numeral explanation
1 multifocal intraocular lenses
2 opticators
3 optic (or efficient light school district)
4 optic edges
5 buttons loop
6 optic rear surfaces
7 anterior optic surface
8 diffraction slope rings
The optical axis of AO multifocal intraocular lenses.
Detailed description of the invention
Following specific embodiment is just for further the present invention being explained further, but the present invention is not limited to following specific embodiments.Any variation on these embodiment bases, as long as spirit according to the invention and scope all will fall in the covering scope of patent of the present invention.
Multifocal intraocular lenses in the embodiment of the present invention by refractive index the material 1.41 to 1.52 make.Certainly, those skilled in the art also can recognize, multifocal intraocular lenses of the present invention can be made up of other conventional materials such as silica gel, hydrogel, hydrophilic acrylate, hydrophobic acrylic acid's ester or polymethyl methacrylates.
The center thickness of the optic of multifocal intraocular lenses of the present invention is in the scope of 0.3 millimeter-1.2 millimeters." center thickness of optic " refers to the thickness in the middle thickness of optic of multifocal intraocular lenses of the present invention.Known for those skilled in the art: the size of the center thickness of the optic of multifocal intraocular lenses of the present invention depends on selected material and the diopter reaching.
The front surface of the multifocal intraocular lenses optic in the embodiment of the present invention or the face shape of rear surface at least will comprise multifocal.
Multifocal intraocular lenses in the embodiment of the present invention can be single type intraocular lens, can be also three-member type intraocular lens.
Fig. 2 is according to the side schematic sectional view of the multifocal intraocular lenses with zero color difference characteristic of an example of the present invention.
As shown in Figure 2, diffraction slope ring 8 is being set symmetrically according to the optical axis AO mirror image about described multifocal intraocular lenses on the optic rear surface 6 of the multifocal intraocular lenses 1 of this example of the present invention.In described optic, the quantity of diffraction slope ring is between 6-35, wherein the initial boundary position of the first diffraction slope ring is between 0.580-0.520 mm, the end boundary position of the first diffraction slope ring is between 0.815-0.735mm, and in optic, the characteristic size of diffraction slope ring, between 0.125-0.048mm, is zero thereby make the aberration of described multifocal intraocular lenses self.Certainly, those skilled in the art also can recognize: diffraction slope ring 8 also can be so arranged in the anterior optic surface 7 of described multifocal intraocular lenses 1, or can be so arranged on the optic rear surface 6 and anterior optic surface 7 of described multifocal intraocular lenses 1.In described optic, the preferred parameters scope of diffraction slope ring is as follows: in described optic, the quantity of diffraction slope ring is between 6-30, wherein the initial boundary position of the first diffraction slope ring is between 0.575-0.522mm, the end boundary position of the first diffraction slope ring is between 0.810-0.745mm, and the characteristic size that in optic, diffraction slope is encircled is between 0.124-0.051mm.
The curvature of described multifocal intraocular lenses anterior optic surface and optic rear surface is looked distance vision acuity for multifocal intraocular lenses provides, and its scope is at-10-34D, and preferable range is 6-34D; On the basis depending on distance vision acuity, to increase an additional optical focal power depending near optical power; The value size of additional optical focal power is according to intraocular lens's refractive index, thickness and determine; It is zero color difference that the value of additional optical focal power makes multifocal intraocular lenses of the present invention itself look near, and its scope is generally at 3.05-3.95D, and preferable range is 3.10-3.80D.
, choose an example of the multifocal intraocular lenses with zero color difference of the present invention below, compare with the comparative example of prior art multifocal intraocular lenses, obtain the correlation curve shown in Figure 11-13.
Example of the present invention:
Material character: refractive index 1.46;
Face shape: biconvex shape, front surface aspheric surface, rear surface sphere, design parameter sees the following form 1.
Additional optical focal power: 3.68D.
Table 1
| Parameter | Ra/mm | Rp/mm | T/mm | R | V | Additional optical focal power/D |
| Optimum embodiment | 12.36 | -12.06 | 0.80 | 1.46 | 54 | 3.68 |
Note: Ra is intraocular lens's front surface radius of curvature; Rp is intraocular lens rear surface radius of curvature; T is intraocular lens's center thickness; R is intraocular lens's refractive index; V is intraocular lens's Abbe number.
Comparative example:
Positive aberration multifocal intraocular lenses: other parameter of additional optical focal power+3D(is identical with optimum embodiment table 1)
Negative aberration multifocal intraocular lenses: other parameter of additional optical focal power+5D(is identical with optimum embodiment table 1)
Figure 11 is the have multifocal intraocular lenses of zero color difference and the MTF correlation curve of the multifocal intraocular lenses with positive aberration and negative aberration of prior art under 6mm clear aperature near vision polychromatic light condition of the present invention, and wherein curve A shows the MTF of zero color difference intraocular lens under near vision polychromatic light diffraction limit condition; Curve B shows the MTF of zero color difference intraocular lens under near vision polychromatic light condition; Curve C shows the MTF of the poor intraocular lens of the normsl skin color under near vision polychromatic light condition; Curve D shows the MTF of negative aberration intraocular lens under near vision polychromatic light condition.
In optometry, object is made up of the sine streak of different space frequency, and in the time that object carries out imaging through opthalmic optics's system, the frequency content of imaging is identical with the frequency content of thing, and the modulation degree of sine streak is different.Spatial frequency F(Spatial frequency is here described) the space periodic number of the interior sine streak of representation unit distance, the light and shade striped logarithm (lp/mm) comprising in conventional every millimeter represents.The MTF of optical system refers to the modulation degree of sine streak after optical system and the ratio of the modulation degree through before optical system of different space frequency, it is worth between 0-1, reflect the variation of sine streak modulation degree corresponding to each frequency content, be the function of spatial frequency, reflected the transmission capacity of optical system to different space frequency.In general, MTF reduces gradually along with the increase of spatial frequency.The high frequency region of MTF is described the details of object, the level of intermediate frequency zone reaction object, and the profile of object is described in low frequency range, mtf value is the reaction of the optical system of human eye to different fine degree, that intraocular lens's optical property is the most comprehensively reacted, be worth larger, represent optical property better.Than the multifocal intraocular lenses with positive aberration and negative aberration, zero color difference multifocal intraocular lenses mtf value is higher than both.As can be seen here, zero color difference multifocal intraocular lenses can provide better optical quality under near vision polychromatic light condition.
Figure 12 be the multifocal intraocular lenses with zero color difference of the present invention and prior art there is positive aberration and the negative aberration multifocal intraocular lenses MTF correlation curve under eccentric 0.3mm and 0.7mm condition under 6mm clear aperature near vision polychromatic light condition, wherein curve A shows zero color difference intraocular lens at the near vision MTF under polychromatic light condition without acceptance of persons; Curve B shows the MTF of zero color difference intraocular lens under the eccentric 0.3mm polychromatic light of near vision part; Curve C shows the MTF of the poor intraocular lens of the normsl skin color under the eccentric 0.3mm polychromatic light of near vision condition; Curve D shows the MTF of negative aberration intraocular lens under the eccentric 0.3mm polychromatic light of near vision condition; Curve E shows the MTF of zero color difference intraocular lens under the eccentric 0.7mm polychromatic light of near vision condition; Curve F shows the MTF of the poor intraocular lens of the normsl skin color under the eccentric 0.7mm polychromatic light of near vision condition; Curve G shows the MTF of negative aberration intraocular lens under the eccentric 0.7mm polychromatic light of near vision condition.
In intraocular lens's implantation process, for various reasons, the situation that tends to Phakic center and pupil center's misalignment occurs, and the size variation of pupil is also eccentric conventionally.In refractive surgery process, once lenticular position is eccentric, will introduce aberration, be lowered into image quality.Figure 12 has represented the MTF curve of zero color difference, positive aberration and negative aberration multifocal intraocular lenses eccentric 0.3mm and 0.7mm under the near vision polychromatic light condition.Under identical eccentricity value condition, zero color difference multifocal intraocular lenses under near vision polychromatic light condition mtf value higher than the multifocal intraocular lenses with positive aberration and negative aberration, the quality of optical imaging that shows zero color difference multifocal intraocular lenses is more excellent, has the characteristic of anti-bias.
Figure 13 is the MTF correlation curve that positive aberration and negative aberration multifocal intraocular lenses have a down dip under 1 °, 3 °, 5 ° and 7 ° of conditions in 6mm clear aperature near vision polychromatic light condition that has of the multifocal intraocular lenses with zero color difference of the present invention and prior art, wherein curve A show zero color difference intraocular lens near vision without the MTF under inclination polychromatic light condition; Curve B shows the MTF that zero color difference intraocular lens tilts under 1 ° of polychromatic light condition near vision; Curve C shows the MTF that the poor intraocular lens of the normsl skin color tilts under 1 ° of polychromatic light condition near vision; Curve D shows the MTF that negative aberration intraocular lens tilts under 1 ° of polychromatic light condition near vision; Curve E shows the MTF that zero color difference intraocular lens tilts under 3 ° of polychromatic light conditions near vision; Curve F shows the MTF that the poor intraocular lens of the normsl skin color tilts under 3 ° of polychromatic light conditions near vision; Curve G shows the MTF that negative aberration intraocular lens tilts under 3 ° of polychromatic light conditions near vision; Curve H shows the MTF that zero color difference intraocular lens tilts under 5 ° of polychromatic light conditions near vision; Curve N shows the MTF that the poor intraocular lens of the normsl skin color tilts under 5 ° of polychromatic light conditions near vision; Curve J shows the MTF that negative aberration intraocular lens tilts under 5 ° of polychromatic light conditions near vision; Curve K shows the MTF that zero color difference intraocular lens tilts under 7 ° of polychromatic light conditions near vision; Curve L shows the MTF that the poor intraocular lens of the normsl skin color tilts under 7 ° of polychromatic light conditions near vision; Curve M shows the MTF that negative aberration intraocular lens tilts under 7 ° of polychromatic light conditions near vision.
Similar to intraocular lens's bias, in refractive surgery process, also can usually there is lenticular rotation phenomenon.Crystalline lens rotates the usually generation with astigmatic phenomenon.Figure 13 has schematically represented that zero color difference, positive aberration and negative aberration multifocal intraocular lenses are at the have a down dip MTF curve of 1 °, 3 °, 5 ° and 7 ° of near vision polychromatic light condition.Under identical angle of inclination condition, zero color difference multifocal intraocular lenses at mtf value under near vision polychromatic light condition higher than the multifocal intraocular lenses with positive aberration and negative aberration, the optical property that shows zero color difference multifocal intraocular lenses is better, has the characteristic of anti-inclination.
The present invention has following beneficial effect especially:
The multifocal intraocular lenses with zero color difference characteristic of the present invention has improved the image quality of multifocal intraocular lenses under polychromatic light condition, strengthens anti-inclination and eccentric characteristic, thereby is conducive to obtain Extra Vision.
Embodiment
Below adopt embodiment in further detail the multifocal intraocular lenses with zero color difference characteristic of the present invention to be described, but those skilled in the art can recognize: the present invention is not limited to these embodiment below.
Embodiment 1
Material character: refractive index 1.41;
Face shape: biconvex shape, front surface aspheric surface, rear surface sphere, diffraction slope ring is positioned at rear surface, and design parameter sees the following form 2.
Depending on distance vision acuity: 15D.
Additional optical focal power: 3.05D.
Table 2
| Parameter | Ra/mm | Rp/mm | T/mm | R | V | Additional optical focal power/D |
| Optimum embodiment | 9.865 | -9.565 | 1.0 | 1.41 | 58 | 3.05 |
Note: Ra is intraocular lens's front surface radius of curvature; Rp is intraocular lens rear surface radius of curvature; T is intraocular lens's center thickness; R is intraocular lens's refractive index; V is intraocular lens's Abbe number.
Because human eye refracting media has natural dispersion characteristics, secondary color white light is after opthalmic optics's system, and optical path difference (unit: wavelength) reaches 10 more than wavelength, can introduce the aberration that is greater than 2D, and this will bring certain visual disorder to patient.Fig. 3 is the variation schematic diagram of the multifocal intraocular lenses with the zero color difference characteristic according to a first advantageous embodiment of the invention optical path difference under the near vision polychromatic light condition of 6mm entrance pupil aperture along with pupil position, in whole entrance pupil pore diameter range, within the optical path difference of 470-650nm wave-length coverage is controlled at 0.8 wavelength, greatly reduce aberration, improved visual quality; Fig. 4 is the MTF curve synoptic diagram of multifocal intraocular lenses shown in Fig. 3 under polychromatic light near vision condition.
Embodiment 2
Material character: refractive index 1.45;
Face shape: biconvex shape, front surface aspheric surface, rear surface sphere, diffraction slope ring is positioned on rear surface, and design parameter sees the following form 3.
Depending on distance vision acuity 20D.
Additional optical focal power: 3.23D.
Table 3
| Parameter | Ra/mm | Rp/mm | T/mm | R | V | Additional optical focal power/D |
| Optimum embodiment | 11.055 | -11.355 | 0.90 | 1.45 | 58 | 3.23 |
Note: Ra is intraocular lens's front surface radius of curvature; Rp is intraocular lens rear surface radius of curvature; T is intraocular lens's center thickness; R is intraocular lens's refractive index; V is intraocular lens's Abbe number.
Fig. 5 is the variation schematic diagram of the optical path difference of the multifocal intraocular lenses with zero color difference characteristic according to a second, preferred embodiment of the present invention under the near vision polychromatic light condition of 6mm entrance pupil aperture with pupil position, in whole entrance pupil pore diameter range, within 0.9 wavelength of the optical path difference control of 470-650nm wave-length coverage.Fig. 6 is the MTF curve synoptic diagram of multifocal intraocular lenses shown in Fig. 5 under polychromatic light near vision condition.
Embodiment 3
Material character: refractive index 1.47;
Face shape: biconvex shape, rear protruding, front surface aspheric surface, rear surface sphere, diffraction slope ring is positioned on rear surface, and design parameter sees the following form 4.
Depending on distance vision acuity: 20D.
Additional optical focal power: 3.60D.
Table 4
| Parameter | Ra/mm | Rp/mm | T/mm | R | V | Additional optical focal power/D |
| Optimum embodiment | 16.05 | -11.10 | 0.8 | 1.47 | 56 | 3.60 |
Note: Ra is intraocular lens's front surface radius of curvature; Rp is intraocular lens rear surface radius of curvature; T is intraocular lens's center thickness; R is intraocular lens's refractive index; V is intraocular lens's Abbe number.
Fig. 7 be according to the multifocal intraocular lenses with zero color difference characteristic of the 3rd preferred embodiment of the present invention optical path difference under the near vision polychromatic light condition of 6mm entrance pupil aperture with the variation schematic diagram of pupil position, in whole entrance pupil pore diameter range, within the optical path difference of 470-650nm wave-length coverage is controlled at 0.9 wavelength.Fig. 8 is the MTF curve synoptic diagram of multifocal intraocular lenses shown in Fig. 7 under near vision polychromatic light condition.
Embodiment 4
Material character: refractive index 1.52;
Face shape: biconvex shape, rear protruding, front surface aspheric surface, rear surface sphere, diffraction slope ring is positioned on rear surface, and design parameter sees the following form 5.
Depending on distance vision acuity: 20D.
Additional optical focal power: 3.95D.
Table 5
| Parameter | Ra/mm | Rp/mm | T/mm | R | V | Additional optical focal power/D |
| Optimum embodiment | 27.3 | 13.40 | 0.70 | 1.52 | 56 | 3.95 |
Note: Ra is intraocular lens's front surface radius of curvature; Rp is intraocular lens rear surface radius of curvature; T is intraocular lens's center thickness; R is intraocular lens's refractive index; V is intraocular lens's Abbe number.
Fig. 9 is the optical path difference schematic diagram under the near vision polychromatic light condition of 6mm entrance pupil aperture according to the multifocal intraocular lenses with zero color difference characteristic of the 4th preferred embodiment of the present invention, in whole entrance pupil pore diameter range, the optical path difference of 470-650nm wave-length coverage is within a wavelength.Figure 10 is the MTF curve synoptic diagram of multifocal intraocular lenses shown in Fig. 9 under near vision polychromatic light condition.
Embodiment is above only illustrative rather than restrictive.Therefore,, in the situation that not departing from invention disclosed herein design, those skilled in the art can modify or change above-described embodiment.Therefore, protection scope of the present invention is only limited by the scope of appended claims.
Claims (7)
1. a multifocal intraocular lenses, described multifocal intraocular lenses comprises the opticator being made up of optic and optic edge,
It is characterized in that,
On anterior optic surface and/or optic rear surface, about the optical axis mirror image of described multifocal intraocular lenses, diffraction slope ring is set symmetrically, the quantity of described diffraction slope ring is between 6-35, wherein the initial boundary position of the first diffraction slope ring is between 0.580-0.520 mm, the end boundary position of the first diffraction slope ring is between 0.815-0.735mm, and the characteristic size of described diffraction slope ring is between 0.125-0.048mm, is zero thereby make the aberration of described multifocal intraocular lenses self.
2. multifocal intraocular lenses according to claim 1, is characterized in that, described multifocal intraocular lenses depending on distance vision acuity scope be-10-34D and additional optical power range are 3.05-3.95D.
3. multifocal intraocular lenses according to claim 1, is characterized in that, described multifocal intraocular lenses be that 6-34D and additional optical power range are 3.10-3.80D depending on distance vision acuity scope.
4. multifocal intraocular lenses according to claim 1, it is characterized in that, the quantity of described diffraction slope ring is between 6-30, wherein the initial boundary position of the first diffraction slope ring is between 0.575-0.522mm, the end boundary position of the first diffraction slope ring is between 0.810-0.745mm, and the characteristic size of described diffraction slope ring is between 0.124-0.051mm.
5. according to the multifocal intraocular lenses described in any one in aforementioned claim 1-4, it is characterized in that, the refractive index of preparing material of described multifocal intraocular lenses is between 1.41 to 1.52.
6. multifocal intraocular lenses according to claim 5, is characterized in that, described multifocal intraocular lenses is single type intraocular lens or three-member type intraocular lens.
7. multifocal intraocular lenses according to claim 5, is characterized in that, the material of preparing of described multifocal intraocular lenses is silica gel, hydrogel, hydrophilic acrylate, hydrophobic acrylic acid's ester or polymethyl methacrylate.
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| CN115919505B (en) * | 2022-11-22 | 2024-02-06 | 无锡蕾明视康科技有限公司 | Achromatic multifocal intraocular lens |
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