CN217660293U - Artificial lens - Google Patents
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- CN217660293U CN217660293U CN202221566011.2U CN202221566011U CN217660293U CN 217660293 U CN217660293 U CN 217660293U CN 202221566011 U CN202221566011 U CN 202221566011U CN 217660293 U CN217660293 U CN 217660293U
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Abstract
The utility model discloses an intraocular lens, including optical portion, optical portion's first surface includes first central zone and at least one first annular region, and the focal power of first central zone and first annular region is different, and optical portion's second surface includes second central zone and at least one second annular region, and the focal power of second central zone and second annular region is different, and first central zone and second central zone do not project to each other completely. Based on the deflection capability of each area of the first surface and each area of the second surface of the optical part to light rays, the light rays enter the optical part from the first surface and are refracted out from the second surface of the optical part, and can be converged to at least three different positions on the optical axis of the optical part. Therefore, the artificial lens has at least three focuses, can provide different eyesight, does not need to form a plurality of uneven annular structures on the surface of the artificial lens, and is not easy to generate phenomena of glare and halation and small in light energy loss.
Description
Technical Field
The utility model relates to the field of ophthalmic products, in particular to an intraocular lens.
Background
The lens of a normal human eye, which is transparent and forms an important part of the total optical power of the eye, is biconvex, with a radius of curvature of the anterior surface of about 10 mm and a radius of curvature of the posterior surface of about 6mm, and the optical power of the lens of the human eye can be varied, such as in a zoom lens of a camera. The lens of human eyes is elastic, the thickness of the lens becomes thinner when people look at objects at far distances, the focal power becomes smaller, the thickness of the lens becomes thicker when people look at objects at near distances, the focal power becomes larger, and light rays of the objects at different distances can be focused and imaged on retinas. After the crystalline lens becomes turbid, the light transmission performance is reduced, namely cataract appears, and the current treatment method is to absorb the cataract and implant an artificial crystalline lens with certain focal power to replace the original crystalline lens.
Early implanted intraocular lenses were monofocal and did not zoom as well as the crystalline lens, resulting in clear distance vision, poor near and intermediate vision after cataract surgery, for example, presbyopic glasses were needed to see objects at close range. Subsequently, multifocal intraocular lenses were developed, mainly including refractive multifocal intraocular lenses and diffractive multifocal intraocular lenses. However, the conventional refractive multifocal intraocular lens has an uneven refractive ring on its surface, which is prone to produce glare and halation, and the central position of the intraocular lens after implantation is very high, which is prone to produce glare when slightly shifted. The diffractive multifocal intraocular lens is based on the diffractive optics principle, has an uneven diffractive ring on the surface, belongs to a Fresnel lens, is poor in imaging quality, and can generate glare, halo and large in light energy loss.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is an object of the present invention to provide an intraocular lens having at least three focal points, and which is less prone to the phenomena of glare, halos, and light energy loss than the prior art.
In order to achieve the above object, the utility model provides a following technical scheme:
an intraocular lens comprising an optic, a first surface of the optic comprising a first central zone and at least one first annular zone, the first central zone and the first annular zone having different optical powers;
the second surface of the optical portion comprises a second central area and at least one second annular area, the power of the second central area is different from that of the second annular area, the first central area and the second central area are not completely projected onto each other, so that light rays enter the optical portion from the first surface, refract out of the second surface and can converge to at least three different positions on the optical axis of the optical portion.
Preferably, the light of the object at the first distance enters the optical part from the first central area, refracts out from the second central area and converges to a first position on the optical axis of the optical part;
if the second central area can not be completely projected onto the first central area, the light of the object at the second distance enters the optical part from the first annular area, refracts out from the second central area and converges to a second position on the optical axis of the optical part;
if the first central area can not be completely projected onto the second central area, the light of the object at the second distance enters the optical part from the first central area, refracts out from the second annular area and converges to a second position on the optical axis of the optical part;
the distance from the first distance object to the center of the intraocular lens is different from the distance from the second distance object to the center of the intraocular lens.
Preferably, the distance from the first distance object to the center of the intraocular lens is greater than the distance from the second distance object to the center of the intraocular lens.
Preferably, light rays of a third distance object enter the optical portion from the first annular area, are refracted out of the second annular area, and converge to a third position on the optical axis of the optical portion, and the distance from the third distance object to the center of the intraocular lens is different from the distance from the second distance object to the center of the intraocular lens and the distance from the first distance object to the center of the intraocular lens.
Preferably, the distance from the first distance object to the center of the intraocular lens is greater than the distance from the second distance object to the center of the intraocular lens, and the distance from the second distance object to the center of the intraocular lens is greater than the distance from the third distance object to the center of the intraocular lens.
Preferably, the distance from the second position to the center of the intraocular lens is smaller than the distance from the first position to the center of the intraocular lens, and the distance from the third position to the center of the intraocular lens is smaller than the distance from the second position to the center of the intraocular lens.
Preferably, the second central region cannot be completely projected onto the first central region, the first surface of the optical portion comprises at least two first annular regions, and the first annular regions adjacent to the first central region are not completely projected onto the second central region, the first annular regions each having a different optical power;
alternatively, the first central area may not be fully projected onto the second central area, the second surface of the optic includes at least two of the second annular areas, and the second annular areas adjacent to the second central area are not fully projected onto the first central area, the second annular areas each having a different optical power.
Preferably, the second central area is not fully projected onto the first central area, the first surface of the optic includes near first loop areas and far first loop areas, and the near first loop areas are not fully projected onto the second central area;
the light of the object with the first distance enters the optical part from the first central area, is refracted out from the second central area and is converged to a first position on the optical axis of the optical part;
the light rays of the object at the second distance enter the optical part from the near first annular area, are refracted out from the second central area and are converged to a second position on the optical axis of the optical part;
light of an object at a third distance enters the optical part from the near first annular area, is refracted out from the second annular area and is converged to a third position on the optical axis of the optical part;
the light rays of the object at the second distance enter the optical part from the far first annular area, are refracted out from the second annular area and are converged to a second position on the optical axis of the optical part;
the distance from the first distance object to the center of the intraocular lens, the distance from the second distance object to the center of the intraocular lens and the distance from the third distance object to the center of the intraocular lens are all different.
Preferably, the first central area is not fully projected onto the second central area, the second surface of the optic includes proximal and distal second annular areas, and the proximal second annular area is not fully projected onto the first central area;
the light of the object with the first distance enters the optical part from the first central area, is refracted out from the second central area and is converged to a first position on the optical axis of the optical part;
the light rays of the object at the second distance enter the optical part from the first central area, are refracted out from the near second annular area and are converged to a second position on the optical axis of the optical part;
light rays of an object at a third distance enter the optical part from the first annular area, are refracted out from the near second annular area and are converged to a third position on the optical axis of the optical part;
the light rays of the object at the second distance enter the optical part from the first annular area, are refracted out from the far second annular area and are converged to a second position on the optical axis of the optical part;
the distance from the first distance object to the center of the intraocular lens, the distance from the second distance object to the center of the intraocular lens and the distance from the third distance object to the center of the intraocular lens are all different.
Preferably, the radial dimension of the first central region is smaller than the radial dimension of the second central region, so that the second central region cannot be completely projected onto the first central region;
the radial dimension of the first central region is greater than the radial dimension of the second central region such that the first central region cannot be fully projected onto the second central region.
Preferably, the power gradually increases from outside to inside in the first annular region, or gradually increases from outside to inside in the second annular region.
Preferably, the height of the outer edge of the first central region is consistent with the height of the inner edge of the first annular region, or the height of the outer edge of the second central region is consistent with the height of the inner edge of the second annular region.
Preferably, the first central area is a spherical surface or an aspherical surface, the first annular area is a spherical surface or an aspherical surface, the second central area is a spherical surface or an aspherical surface, and the second annular area is a spherical surface or an aspherical surface.
In view of the above, the present invention provides an intraocular lens comprising an optic, a first surface of the optic comprising a first central area and at least one first annular area, the first central area and the first annular area having different focal powers, a second surface of the optic comprising a second central area and at least one second annular area, the second central area and the second annular area having different focal powers, wherein the first central area and the second central area are not completely projected onto each other. Based on the deflection capability of each area of the first surface and each area of the second surface of the optical part to light rays, the light rays enter the optical part from the first surface of the optical part and are refracted out from the second surface of the optical part, and can be converged to at least three different positions on the optical axis of the optical part. Therefore, the utility model discloses an intraocular lens has at least three focus, can provide different eyesight to compare with prior art and need not necessarily form a plurality of unevenness's annular structure on intraocular lens surface, make the phenomenon and the light energy loss that are difficult to produce glare, halo little.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a front view of an intraocular lens provided according to an embodiment of the present invention;
FIG. 2 is an optical path diagram of the intraocular lens shown in FIG. 1 imaging an object at a first distance;
FIG. 3 is an optical path diagram of the intraocular lens shown in FIG. 1 imaging an object at a second distance;
FIG. 4 is an optical path diagram of the intraocular lens shown in FIG. 1 imaging an object at a third distance;
FIG. 5 is a front view of an intraocular lens provided in accordance with yet another embodiment of the present invention;
figure 6 is a side view of the intraocular lens shown in figure 5.
Reference numerals in the drawings of the specification include:
optic-10, first surface-11, second surface-12, first central area-100, first annular area-101, second central area-102, second annular area-103, proximal first annular area-104, and distal first annular area-105.
Detailed Description
In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
This embodiment provides an intraocular lens comprising an optic, the first surface of the optic comprising a first central zone and at least one first annular zone, the first central zone and the first annular zone having different powers, the second surface of the optic comprising a second central zone and at least one second annular zone, the second central zone and the second annular zone having different powers, the first central zone and the second central zone not being fully projected onto each other such that light entering the optic from the first surface refracts out of the second surface and can converge to at least three different locations on the optic axis.
The optic is the portion of the intraocular lens through which light is required to pass. The focal power represents the deflection capability of parallel rays incident to the optical system to the parallel rays.
The light of the object enters the optical part from the first surface of the optical part and is refracted out from the second surface of the optical part for focusing and imaging. Based on the deflection capacity of each area of the first surface and each area of the second surface of the optical part to light rays, the light rays enter the optical part from the first surface of the optical part, are refracted out from the second surface of the optical part, and can be converged to at least three different positions on the optical axis of the optical part, namely focused and imaged at least three different positions on the optical axis of the optical part. Therefore, the intraocular lens of the present embodiment has at least three focal points, can provide different vision, and compared with the prior art, does not have to form a plurality of uneven ring-shaped structures on the surface of the intraocular lens, so that phenomena of glare and halation are not easy to generate, and the loss of light energy is small.
And the light rays are focused and imaged after penetrating through the intraocular lens by combining the refraction effect of the first surface of the intraocular lens on the light rays and the refraction effect of the second surface of the intraocular lens on the light rays. In this embodiment, the focal powers of the first central region and the first annular region of the first surface of the optical portion are not limited, and the focal powers of the second central region and the second annular region of the second surface of the optical portion are not limited, and may be set according to the respective focal positions of the intraocular lenses with different focal powers in practical applications.
The first central region of the first surface and the second central region of the second surface are not completely projected onto each other, i.e. there is a non-overlapping area of the first central region and the second central region. So that light entering the optic from the first central area will not all refract out of the second central area, but will have a portion that refracts out of the second annular area, allowing the light to converge to a different location. Alternatively, the light rays refracted out of the second central area do not all enter the optic from the first central area, but rather a portion of the light rays enter the optic from the first annular area, allowing the light rays to converge to different locations. Therefore, the intraocular lens of the present embodiment has a plurality of focal points by combining the first surface and the second surface to form the intraocular lens into a plurality of different optical powers by the first surface and the second surface having different optical powers in respective regions of the first surface.
As an alternative embodiment, the second central area cannot be completely projected onto the first central area, and the light rays of the object at the first distance enter the optical part from the first central area, refract out of the second central area, and converge to a first position on the optical axis of the optical part; and the light of the object at the second distance enters the optical part from the first annular area, is refracted out from the second central area and is converged to a second position on the optical axis of the optical part. The distance from the first distance object to the center of the intraocular lens is different from the distance from the second distance object to the center of the intraocular lens. The first distance object is an object having a distance to the center of the intraocular lens within a first distance range, and the second distance object is an object having a distance to the center of the intraocular lens within a second distance range.
In the present embodiment, the magnitude relationship between the distance from the first distance object to the center of the intraocular lens and the distance from the second distance object to the center of the intraocular lens is not limited. For example, the minimum distance of the first distance range may be greater than the maximum distance of the second distance range, i.e. the distance from the first distance object to the center of the intraocular lens is greater than the distance from the second distance object to the center of the intraocular lens.
Referring now to fig. 1, 2 and 3 for illustrative purposes, fig. 1 is a front view of an intraocular lens provided according to one embodiment, fig. 2 is an optical path diagram of the intraocular lens shown in fig. 1 for imaging objects at a first distance, and fig. 3 is an optical path diagram of the intraocular lens shown in fig. 1 for imaging objects at a second distance. As shown in fig. 1, 2 and 3, the first surface 11 of the intraocular lens comprises a first central zone 100 and a first annular zone 101, and the second surface 12 comprises a second central zone 102 and a second annular zone 103. Wherein the radial dimension of the first central area 100 is smaller than the radial dimension of the second central area 102 such that the second central area 102 cannot be fully projected onto the first central area 100.
As shown in fig. 2, the light of the first-distance object enters the optical portion 10 from the first central area 100, i.e.,base:Sub>A-base:Sub>A area, is refracted out of the second central area 102, specifically, out of thebase:Sub>A 1-base:Sub>A 1 area of the second central area 102, and is converged to the first position C1 on the optical axis of the optical portion 10. I.e. the first distance object is imaged by the intraocular lens in the first position C1. As shown in fig. 3, the light of the object at the second distance enters the optical portion 10 from the first annular region 101, specifically enters the optical portion 10 from the a-B1 region of the first annular region 101, is refracted out of the a1-a region of the second central region 102, and converges to the second position C2 on the optical axis of the optical portion 10. I.e. the second distance object is imaged by the intraocular lens in the second position C2. The artificial lens in the embodiment has two focuses, and can realize imaging of the object with the first distance and imaging of the object with the second distance.
In this embodiment, the distance from the second position C2 to the center of the intraocular lens is smaller than the distance from the first position C1 to the center of the intraocular lens. In practical applications, the first position C1 may correspond to a position on the retina, and the second position C2 corresponds to a position in front of the retina.
Further, in the above embodiment, the light of the third distance object enters the optical portion from the first annular region, is refracted from the second annular region, and converges to the third position on the optical axis of the optical portion, and the distance from the third distance object to the center of the intraocular lens is different from the distance from the second distance object to the center of the intraocular lens and the distance from the first distance object to the center of the intraocular lens. The third distance object refers to an object having a distance to the center of the intraocular lens within a third distance range. In this embodiment, the magnitude relationship between the distance from the third distance object to the center of the intraocular lens, the distance from the first distance object to the center of the intraocular lens, and the distance from the second distance object to the center of the intraocular lens is not limited. For example, the minimum distance of the first distance range is greater than the maximum distance of the second distance range, and the minimum distance of the second distance range is greater than the maximum distance of the third distance range, that is, the distance from the first distance object to the center of the intraocular lens is greater than the distance from the second distance object to the center of the intraocular lens, and the distance from the second distance object to the center of the intraocular lens is greater than the distance from the third distance object to the center of the intraocular lens.
Referring now to fig. 4, fig. 4 is an exemplary optical path diagram for imaging a third distance object with the intraocular lens of fig. 1. As shown in the figure, the light of the object at the third distance enters the optical portion 10 from the first annular region 101, specifically enters the optical portion 10 from the regions B1-B of the first annular region 101, refracts out from the second annular region 103, i.e., regions a-B, and converges to the third position C3 on the optical axis of the optical portion 10. I.e. the third distance object is imaged by the intraocular lens in the third position C3. Therefore, the intraocular lens in this embodiment has three focal points, and can image the object at the first distance, the object at the second distance, and the object at the third distance, and provide far vision, intermediate vision, and near vision.
In this embodiment, the distance from the third position C3 to the center of the intraocular lens is smaller than the distance from the second position C2 to the center of the intraocular lens. In practical applications, the first position C1 may correspond to a position on the retina and the third position C3 to a position in front of the retina.
In yet another alternative embodiment, the second central area is not fully projected onto the first central area, and the first surface of the optic includes at least two of the first annular areas, the first annular areas adjacent to the first central area are not fully projected onto the second central area, the first annular areas each having a different optical power. The second central area cannot be projected completely onto the first central area, i.e., the second central area has at least a portion projected onto the first annular area adjacent the first central area, then light entering the optic from the first central area will be refracted out of the second central area and a portion of light entering the optic from the first annular area adjacent the first central area will also be refracted out of the second central area. The first annular areas adjacent to the first central area are not fully projected onto the second central area and a portion of the light entering the optic from the first annular areas adjacent to the first central area will be refracted away from the second annular areas.
Then, the first central zone and the second central zone combine to form an optical power, the first annular zone and the second central zone adjacent to the first central zone combine to form an optical power, the first annular zone and the second annular zone adjacent to the first central zone combine to form an optical power, the other first annular zone and the second annular zone combine to form an optical power, and the other first annular zone is a first annular zone that is distinguished from the first annular zone adjacent to the first central zone. The combined powers of the regions of the first surface and the regions of the second surface of the optic can be different, respectively, such that the intraocular lens of this embodiment can provide at least four powers, i.e., can have at least four focal points. Alternatively, the optical powers of the combination of the first surface area and the second surface area of the optical portion include at least three different optical powers, for example, two optical powers of the four optical powers formed by the combination may be the same, so that at least three different optical powers are included, and at least three focal points may be provided.
Optionally, as a specific embodiment, the second central area cannot be completely projected onto the first central area, the first surface of the optical portion includes near first annular areas and far first annular areas, and the near first annular areas are not completely projected onto the second central area. The proximal first annular region refers to the first annular region adjacent to the first central region, and the distal first annular region refers to the first annular region adjacent to the proximal first annular region.
Specifically, the light of the object at the first distance enters the optical part from the first central area, is refracted out from the second central area, and is converged to a first position on the optical axis of the optical part; the light of the object at the second distance enters the optical part from the near first annular area, is refracted out from the second central area and is converged to a second position on the optical axis of the optical part; light rays of an object at a third distance enter the optical part from the near first annular area, are refracted out from the second annular area and are converged to a third position on the optical axis of the optical part; the light rays of the object at the second distance enter the optical part from the far first annular area, are refracted out from the second annular area and are converged to a second position on the optical axis of the optical part; the distance from the first distance object to the center of the intraocular lens, the distance from the second distance object to the center of the intraocular lens and the distance from the third distance object to the center of the intraocular lens are all different.
Exemplary reference is made to fig. 5 and 6, with fig. 5 being a front view and fig. 6 being a side view of the intraocular lens shown in fig. 5 provided in a further embodiment, and with the first surface 11 of the intraocular lens comprising a first central zone 100, a proximal first annular zone 104 on the inside and a distal first annular zone 105 on the outside and with the second surface 12 comprising a second central zone 102 and a second annular zone 103. Wherein the radial dimension of the first central area 100 is smaller than the radial dimension of the second central area 102 such that the second central area 102 cannot be fully projected onto the first central area 100. The distance from the outer edge of the near first annular area 104 to the center of the optic 10 is greater than the radial dimension of the second central area 102 so that the near first annular area 104 does not project completely onto the second central area 102.
Referring to FIG. 6,base:Sub>A first central zone 100, i.e., the A-A zone,base:Sub>A near first annular zone 104, i.e., the A-B2 zone,base:Sub>A far first annular zone 105, i.e., the B2-B zone,base:Sub>A second central zone 102, i.e., thebase:Sub>A-base:Sub>A zone, andbase:Sub>A second annular zone 103, i.e., thebase:Sub>A-B zone. Note that the broken lines shown in fig. 6 are only used to indicate the correspondence relationship between the first surface and the second surface of the optical portion 10, and are not used to limit the structure of the optical portion 10.
Light rays of the object at the first distance enter the optical portion 10 from the first central area 100, i.e., thebase:Sub>A-base:Sub>A area, are refracted out of the second central area 102, specifically, out of thebase:Sub>A 1-base:Sub>A 1 area of the second central area 102, and are converged tobase:Sub>A first position on the optical axis of the optical portion 10.
Light rays of the object at the second distance enter the optical part 10 from the near first annular region 104, specifically enter the optical part 10 from the area a-B1 near the first annular region 104, refract out from the area a1-a of the second central region 102, and converge to a second position on the optical axis of the optical part 10. I.e. the second distance object is imaged by the intraocular lens in the second position.
Light rays of the object at the third distance enter the optical part 10 from the near first annular area 104, specifically enter the optical part 10 from the areas B1-B2 near the first annular area 104, refract out from the areas a-B1 of the second annular area 103, and converge to a third position on the optical axis of the optical part 10. I.e. the third distance object is imaged by the intraocular lens in the third position.
In addition, the light of the object at the second distance enters the optical portion 10 from the far first annular region 105, i.e., B2-B region, refracts out from the B1-B region of the second annular region 103, and converges to the second position on the optical axis of the optical portion 10. Therefore, the intraocular lens in this embodiment has three focal points, and can image the object at the first distance, the object at the second distance, and the object at the third distance, and provide far vision, intermediate vision, and near vision.
As yet another alternative, the first central area cannot be completely projected onto the second central area, and the light rays of the object at the first distance enter the optical portion from the first central area, refract out of the second central area, and converge to a first position on the optical axis of the optical portion; and light rays of a second distance object enter the optical part from the first central area, are refracted out of the second annular area and converge to a second position on the optical axis of the optical part, and the distance from the first distance object to the center of the artificial lens is different from the distance from the second distance object to the center of the artificial lens. The artificial lens in the embodiment has two focuses, and can realize imaging of the object with the first distance and imaging of the object with the second distance.
In the present embodiment, the relationship between the distance from the first distance object to the center of the intraocular lens and the distance from the second distance object to the center of the intraocular lens is not limited. For example, the minimum distance of the first distance range may be greater than the maximum distance of the second distance range, i.e. the distance from the first distance object to the center of the intraocular lens is greater than the distance from the second distance object to the center of the intraocular lens.
Further, light rays of a third distance object enter the optical portion from the first annular area, are refracted out of the second annular area, and converge to a third position on the optical axis of the optical portion, and the distance from the third distance object to the center of the intraocular lens is different from the distance from the second distance object to the center of the intraocular lens and the distance from the first distance object to the center of the intraocular lens. The artificial lens in the embodiment has three focuses, can image a first distance object, a second distance object and a third distance object, and can provide far vision, middle vision and near vision. In this embodiment, the magnitude relationship between the distance from the third distance object to the center of the intraocular lens, the distance from the first distance object to the center of the intraocular lens, and the distance from the second distance object to the center of the intraocular lens is not limited. For example, the minimum distance of the first distance range is greater than the maximum distance of the second distance range, and the minimum distance of the second distance range is greater than the maximum distance of the third distance range, that is, the distance from the first distance object to the center of the intraocular lens is greater than the distance from the second distance object to the center of the intraocular lens, and the distance from the second distance object to the center of the intraocular lens is greater than the distance from the third distance object to the center of the intraocular lens.
Optionally, as a further alternative, the first central area may not be fully projected onto the second central area, the second surface of the optic comprises at least two second annular areas, and the second annular areas adjacent to the second central area are not fully projected onto the first central area, the second annular areas each having a different optical power. The first central area cannot be completely projected onto the second central area, i.e., the first central area has at least a portion projected onto the second annular area adjacent to the second central area, then a portion of the light entering the optic from the first central area will be refracted away from the second central area and another portion will be refracted away from the second annular area adjacent to the second central area. The second annular areas adjacent to the second central area are not fully projected onto the first central area, and then a portion of light entering the optic from the first annular areas will be refracted out of the second annular areas adjacent to the second central area.
The first central zone and the second central zone then combine to form an optical power, the first central zone and the second annular zone adjacent to the second central zone combine to form an optical power, the first annular zone and another second annular zone combine to form an optical power, the other second annular zone being a second annular zone distinct from the second annular zone adjacent to the second central zone. The combined powers of the regions of the first surface and the regions of the second surface of the optic can be different, respectively, such that the intraocular lens of this embodiment can provide at least four powers, i.e., can have at least four focal points. Alternatively, the optical powers formed by combining the areas on the first surface and the second surface of the optical part at least comprise three different optical powers, for example, two optical powers of the four optical powers formed by combining the optical parts are the same, so that the intraocular lens at least comprises three different optical powers and has at least three focal points.
Optionally, as a specific embodiment, the first central area cannot be fully projected onto the second central area, the second surface of the optic includes a proximal second annular area and a distal second annular area, and the proximal second annular area is not fully projected onto the first central area. The proximal second annular region is the second annular region adjacent to the second central region, and the distal second annular region is the second annular region adjacent to the proximal second annular region.
Specifically, the light of the object at the first distance enters the optical part from the first central area, is refracted out from the second central area, and is converged to a first position on the optical axis of the optical part; the light rays of the object at the second distance enter the optical part from the first central area, are refracted out from the near second annular area and are converged to a second position on the optical axis of the optical part; light rays of an object at a third distance enter the optical part from the first annular area, are refracted out from the near second annular area and are converged to a third position on the optical axis of the optical part; the light rays of the object at the second distance enter the optical part from the first annular area, are refracted out from the far second annular area and are converged to a second position on the optical axis of the optical part; the distance from the first distance object to the center of the intraocular lens, the distance from the second distance object to the center of the intraocular lens and the distance from the third distance object to the center of the intraocular lens are all different. The artificial lens in the embodiment has three focuses, can image a first distance object, a second distance object and a third distance object, and can provide far vision, middle vision and near vision.
Preferably, in each of the above embodiments, the power of the first annular region may be gradually changed, and the power may be gradually increased from the outside to the inside in the first annular region. For example, the power of the outermost periphery of the first annular zone may be similar to the power of the first central zone, with the power increasing progressively from the outside inward to the power designed for the first annular zone near the inner periphery of the annular zone.
Preferably, in each of the above embodiments, there may be a power progression of the second annular region. There may be a gradual increase in power from the outside to the inside in the second annular region. For example, the power of the second annular zone may be increased in a stepwise manner, with the power at the outermost periphery being similar to the power of the second central zone, with the power increasing in a stepwise manner from the outside inward to the power designed for the second annular zone near the inner periphery of the annular zone. For example, in the case of the intraocular lens shown in fig. 1 to 4, the first distance object is a long distance object, the second distance object is a middle distance object, and the third distance object is a short distance object, and if the focal power of the second annular region increases gradually from outside to inside in the above manner, the middle distance object is carried outside the second annular region, and the short distance object is carried inside the second annular region, so that the design increases the light energy of the middle distance object entering the pupil by increasing the light energy of the middle distance object entering the pupil by more than 3.6mm in a dark environment such as an indoor environment, and the light energy of the short distance object does not need to be too much.
Preferably, in each of the above embodiments, the outer edge of the first central region and the inner edge of the first annular region have a uniform height, such that the first central region and the first annular region of the first surface form a zero step height transition. If the first surface comprises a plurality of first annular regions, the edge heights at which two adjacent first annular regions meet are uniform, such that a zero step height transition is formed at the first surface of the intraocular lens.
Preferably, in each of the above embodiments, the outer edge of the second central region and the inner edge of the second annular region have a uniform height, such that the second central region and the second annular region of the second surface form a zero step height transition. If the second surface comprises a plurality of second annular regions, the edges where two adjacent second annular regions meet are of uniform height such that a zero step height transition is formed at the second surface of the intraocular lens.
For the traditional refraction type multifocal artificial lens, a plurality of uneven refraction rings are arranged on the surface of the traditional refraction type multifocal artificial lens, and a plurality of uneven diffraction rings are arranged on the surface of the diffraction type multifocal artificial lens, because a plurality of uneven structures exist on the surface of the artificial lens, glare and halation are easy to generate.
In each of the above embodiments, the first central region of the first surface may be spherical or aspherical, and the first annular region of the first surface may be spherical or aspherical. In each of the above embodiments, the second central region of the second surface may be spherical or aspherical, and the second annular region of the second surface may be spherical or aspherical. The surface of the optical part adopts an aspheric surface, and the power gradual change of the surface can be realized by utilizing the aspheric surface.
According to the standard YY0290.2-2009 of the people's republic of China medical industry, part 2 of the intraocular lens: optical performance and test methods appendix A measurement of focal Power ", the formula given for the calculation of the focal Power of the intraocular lens is:
F＝F f +F b -(t c /n IOL )·F f ·F b ； (1)
wherein: f represents the focal power of the intraocular lens in diopter (D), F f Represents the optical power of the anterior surface of the intraocular lens; f b Denotes the power of the posterior surface of the intraocular lens, t c Denotes the center thickness of the intraocular lens in meters (m), n IOL Representing the refractive index of the intraocular lens optical material.
The power of the anterior surface of the intraocular lens is calculated as:
F f ＝(n IOL -n med )/r f ； (2)
wherein r is f The value of the radius of curvature of the anterior surface of the intraocular lens is expressed in meters (m), n med Representing the refractive index of the medium surrounding the intraocular lens. For example, the intraocular lens is surrounded by aqueous humor and vitreous humor, and the refraction of the aqueous humor and the vitreous humorThe rates were all 1.336.
The formula for calculating the focal power of the posterior surface of the intraocular lens is as follows:
F b ＝(n med -n IOL )/r b ； (3)
wherein r is b The values of the radius of curvature of the posterior surface of the intraocular lens are expressed in meters (m), n med Representing the refractive index of the medium surrounding the intraocular lens.
In one embodiment, the intraocular lens corresponding to that shown in figures 1-4 is made of an acrylic material having a refractive index of 1.5385, a first central region 100 of the first surface 11 having a diameter of 2.08mm, a focal power of +11.13D, and a radius of curvature r A Is 18.194mm. The first annular region 101 is the region between 2.08mm diameter and 6mm diameter, the power is +12.86D, and the radius of curvature r is B Is 15.747mm. The second central region 102 of the second surface 12 has a diameter of 2.56mm, an optical power of +10.95D, and a radius of curvature r a Is 18.493mm. The second annular region 103 is the region between 2.56mm in diameter and 6mm in diameter, has an optical power of +12.44D, and a radius of curvature r b Is 16.278mm. The various surface powers and the combined powers of the intraocular lens are shown in table 1 below.
TABLE 1
The light energy distribution of the intraocular lens was as follows: calculated by the standard pupil diameter of 3mm, the area of the circle with the diameter of 3mm is 7.065 square millimeters (mm) 2 ) The area of a circle with the diameter of 2.56mm is 5.145mm 2 The area of a circle with the diameter of 2.08mm is 3.396mm 2 . The area of the optic of the intraocular lens for viewing distant objects is 3.396mm 2 The far vision light energy accounts for 48 percent; the area of the optical part of the artificial lens for looking at a distance object is 5.145mm 2 -3.396mm 2 ＝1.748mm 2 The proportion of the medium vision light energy is 25 percent; the area of the optical part of the artificial lens for seeing a near-distance object is 7.065mm 2 -5.145mm 2 ＝1.920mm 2 The near vision light energy ratio is 27%. The light energy distribution of the combined refraction type trifocal intraocular lens can change along with the enlargement or the reduction of the pupil. In a room, light rays are dark, pupils are enlarged, the area of the optical part of the artificial lens for seeing objects at a close distance is obviously enlarged, and the near vision for reading books is obviously improved.
In another embodiment, an intraocular lens corresponding to that shown in fig. 5-6 is made of an acrylate material having a refractive index of 1.5385. The first central region 100 of the first surface 11 has a diameter of 2.08mm, an optical power of +11.13D, and a radius of curvature r A Is 18.194mm. The near first annular region 104 is the region between 2.08mm in diameter and 3.6mm in diameter, has a power of +12.86D, and has a radius of curvature r B Is 15.747mm. The distal first annular region 105 is the region between 3.6mm in diameter and 6mm in diameter, has an optical power of +11.13D, and a radius of curvature r B Is 15.747mm.
The second central region 102 of the second surface 12 has a diameter of 2.56mm, an optical power of +10.95D, and a radius of curvature r a Is 18.493mm. The second annular region 103 is the region between 2.56mm in diameter and 6mm in diameter, has an optical power of +12.44D, and a radius of curvature r b Is 16.278mm. The various surface powers and the combined powers of the intraocular lens are shown in table 2 below.
TABLE 2
Alternatively, the materials used in the manufacture of the intraocular lens of this embodiment may be selected from acrylate polymers (abbreviated as acrylates). The acrylate has good light transmission, and the refractive index of the acrylate is as high as 1.5385 at 37 ℃, so that the artificial lens is thinner and lighter compared with the artificial lens made of other materials.
Preferably, the intraocular lens of the present embodiment may be used with ultra-high spermsAnd (5) machining by using a dense lathe, wherein the machining precision of the ultra-high precision lathe is up to 1 micrometer. Using the acrylate round blank as the raw material for turning, selecting a diamond cutter and the front surface of the artificial lens according to r A →r B Turning the curvature radius of the artificial lens according to r a →r b And turning the curvature radius. And finally, machining the artificial lens contour and the loop feet by using a high-precision milling machine.
The above has described in detail an intraocular lens provided by the present invention. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (13)
1. An intraocular lens comprising an optic, a first surface of the optic comprising a first central zone and at least one first annular zone, the first central zone and the first annular zone having different optical powers;
the second surface of the optical portion comprises a second central area and at least one second annular area, the power of the second central area is different from that of the second annular area, the first central area and the second central area are not completely projected onto each other, so that light rays enter the optical portion from the first surface, refract out of the second surface and can converge to at least three different positions on the optical axis of the optical portion.
2. The intraocular lens of claim 1 wherein light rays of a first distance object enter the optic from the first central region, refract out of the second central region, and converge to a first position on the optic axis;
if the second central area can not be completely projected onto the first central area, the light of the object at the second distance enters the optical part from the first annular area, is refracted out from the second central area and is converged to a second position on the optical axis of the optical part;
if the first central area can not be completely projected onto the second central area, the light of the object at the second distance enters the optical part from the first central area, refracts out from the second annular area and converges to a second position on the optical axis of the optical part;
the distance from the first distance object to the center of the intraocular lens is different from the distance from the second distance object to the center of the intraocular lens.
3. The intraocular lens of claim 2, wherein the first distance object is a greater distance from the center of the intraocular lens than the second distance object.
4. The intraocular lens of claim 2 wherein light rays of a third distance object enter the optic from the first annular area, refract out of the second annular area, and converge to a third position on the optic axis, the third distance object being a different distance from the center of the intraocular lens than the second distance object and the first distance object.
5. The intraocular lens of claim 4, wherein the first distance object is a greater distance from the center of the intraocular lens than the second distance object, and wherein the second distance object is a greater distance from the center of the intraocular lens than the third distance object.
6. The intraocular lens of claim 4, wherein the distance from the second location to the center of the intraocular lens is less than the distance from the first location to the center of the intraocular lens, and wherein the distance from the third location to the center of the intraocular lens is less than the distance from the second location to the center of the intraocular lens.
7. The intraocular lens of claim 1 wherein said second central zone is not fully projected onto said first central zone, said first surface of said optic comprises at least two of said first annular zones, and said first annular zones adjacent said first central zone are not fully projected onto said second central zone, each of said first annular zones having a different optical power;
alternatively, the first central area may not be fully projected onto the second central area, the second surface of the optic includes at least two of the second annular areas, and the second annular areas adjacent to the second central area are not fully projected onto the first central area, the second annular areas each having a different optical power.
8. The intraocular lens of claim 7 wherein the second central area is not fully projected onto the first central area, the first surface of the optic comprises a proximal first annular area and a distal first annular area, and the proximal first annular area is not fully projected onto the second central area;
the light of the object with the first distance enters the optical part from the first central area, is refracted out from the second central area and is converged to a first position on the optical axis of the optical part;
the light rays of the object at the second distance enter the optical part from the near first annular area, are refracted out from the second central area and are converged to a second position on the optical axis of the optical part;
light rays of an object at a third distance enter the optical part from the near first annular area, are refracted out from the second annular area and are converged to a third position on the optical axis of the optical part;
the light rays of the object at the second distance enter the optical part from the far first annular area, are refracted out from the second annular area and are converged to a second position on the optical axis of the optical part;
the distance from the first distance object to the center of the intraocular lens, the distance from the second distance object to the center of the intraocular lens and the distance from the third distance object to the center of the intraocular lens are all different.
9. The intraocular lens of claim 7 wherein the first central zone is not fully projected onto the second central zone, the second surface of the optic comprises a proximal second annular zone and a distal second annular zone, and the proximal second annular zone is not fully projected onto the first central zone;
the light of the object with the first distance enters the optical part from the first central area, is refracted out from the second central area and is converged to a first position on the optical axis of the optical part;
the light rays of the object at the second distance enter the optical part from the first central area, are refracted out from the near second annular area and are converged to a second position on the optical axis of the optical part;
light rays of an object at a third distance enter the optical part from the first annular area, are refracted out from the near second annular area and are converged to a third position on the optical axis of the optical part;
the light rays of the object at the second distance enter the optical part from the first annular area, are refracted out from the far second annular area and are converged to a second position on the optical axis of the optical part;
the distance from the first distance object to the center of the intraocular lens, the distance from the second distance object to the center of the intraocular lens and the distance from the third distance object to the center of the intraocular lens are all different.
10. Intraocular lens according to any one of claims 1 to 9, characterized in that the radial dimension of the first central zone is smaller than the radial dimension of the second central zone, so that the second central zone cannot be projected completely onto the first central zone;
the radial dimension of the first central region is greater than the radial dimension of the second central region such that the first central region cannot be fully projected onto the second central region.
11. The intraocular lens of claim 1, wherein the first annular zone has a gradually increasing outside-in power, or wherein the second annular zone has a gradually increasing outside-in power.
12. The intraocular lens of claim 1, wherein the outer edge of the first central zone and the inner edge of the first annular zone are of a uniform height, or wherein the outer edge of the second central zone and the inner edge of the second annular zone are of a uniform height.
13. The intraocular lens of claim 1 wherein said first central region is spherical or aspherical, said first annular region is spherical or aspherical, said second central region is spherical or aspherical, and said second annular region is spherical or aspherical.
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| CN202221566011.2U CN217660293U (en) | 2022-06-21 | 2022-06-21 | Artificial lens |
| US18/099,923 US20230404740A1 (en) | 2022-06-21 | 2023-01-21 | Intraocular lens |
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