JP7088589B2 - Phakic intraocular lens - Google Patents

Description

The present invention relates to a crystalline lens intraocular lens.

The phakic intraocular lens is recognized as a means of correcting visual disorders other than spectacles and contact lenses. As this crystalline lens intraocular lens, a lens implanted between the iris and the crystalline lens is known (Patent Documents 1 to 4).

A crystalline intraocular lens has a flat edge that, under certain conditions, refracts, reflects, and scatters incident light on the retina, creating unwanted optical images (stray light) such as halos, rings, or arcs. .. This physically formed light image causes glare, a subjective sensation of glare with discomfort and obscureness. This glare is caused by this ray when it is refracted, reflected or scattered at the exposed edge of the intraocular lens. Patent Documents 1-3 disclose an intraocular lens that reduces glare.

The crystalline intraocular lens described in Patent Document 4 was implanted between the iris and the crystalline lens, formed concentric grooves in the diffraction grating arranged in the center of the lens, and was arranged outside the diffraction grating. The support portion supports the diffraction grating and forms a hole in the center of the diffraction grating.

Japanese Unexamined Patent Publication No. 08-047504 Japanese Unexamined Patent Publication No. 06-189896 Special Table 2001-510388 Gazette Re-table 2016/013121 Gazette

However, in the crystalline intraocular lens described in Patent Document 4 and the current intraocular lens, since a hole is formed in the center of the lens, the incident light is directly output to the retina as transmitted light through the hole. .. In addition, some incident light is reflected or refracted by the holes to generate stray light. Therefore, halo and glare occur.

An object of the present invention is to provide a crystalline lens intraocular lens capable of reducing stray light generated by a hole.

In order to solve the above problems, the crystalline intraocular lens according to the present invention is a crystalline intraocular lens implanted between the iris and the crystalline lens, and is arranged in the central portion to form a hole. The lens body is provided with a support portion arranged outside the lens body and supporting the lens body, and the hole is tapered so that the hole diameter on the incident side where the incident light is incident is larger than the hole diameter on the exit side. It is provided with a light blocking film formed in a shape on the light incident side of the hole and on the outer peripheral surface of the hole, and the light blocking film is perpendicular to the surface of the light blocking film to which the incident light hits. The incident light is blocked when the incident light is incident and totally reflected at the incident angle θ1 formed by the straight line and the incident light .

FIG. 1 is a diagram showing a configuration of a crystalline lens intraocular lens according to the first embodiment of the present invention. FIG. 2 is a cross-sectional side view of an eye having a crystalline lens intraocular lens according to the first embodiment of the present invention. FIG. 3 is a diagram showing a transmitted ray, a refracted ray, and a total reflected ray when the incident light is incident on the hole of the lens body from the anterior chamber in the crystalline lens intraocular lens according to the first embodiment of the present invention. FIG. 4A is a diagram showing refraction when incident light is incident on the upper surface side of the hole of the lens body from the aqueous humor. FIG. 4B is a diagram showing how the incident light from the aqueous humor is reflected on the lower surface side of the hole of the lens body. FIG. 5 is a diagram showing the stray light intensity of the refracted light ray and the stray light intensity of the total reflected light ray with respect to the pore diameter. FIG. 6A is a diagram showing a hole formed in a tapered shape so that the hole diameter on the incident side of the crystalline lens intraocular lens according to the first embodiment is larger than the hole diameter on the exit side. FIG. 6B is a diagram showing a transmitted ray, a refracted ray, and a total reflected ray in a hole having a taper ratio of 1.0. FIG. 6C is a diagram showing a transmitted ray, a refracted ray, and a total reflected ray in a hole having a taper ratio of 0.85. FIG. 7A is a diagram showing a transmitted ray and a totally reflected ray of a hole having a taper ratio of 1.0 in the crystalline lens intraocular lens according to the first embodiment. FIG. 7B is a diagram showing a transmitted light beam of a hole having a taper ratio of 0.85. FIG. 8A is a diagram showing a hole formed in a tapered shape so that the hole diameter on the incident side of the crystalline lens intraocular lens according to the first embodiment is smaller than the hole diameter on the exit side. FIG. 8B is a diagram showing a refracted ray and a total reflected ray in a hole having a taper ratio of 1.2. FIG. 8C is a diagram showing transmitted light rays and total reflected light rays in a hole having a taper ratio of 1.2. FIG. 9 is a diagram showing the power of the total reflected light ray and the refracted light ray with respect to the taper value. FIG. 10A is a diagram showing a transmitted ray, a refracted ray, and a total reflected ray when the center thickness of the lens body of the crystalline lens intraocular lens according to the second embodiment is 0.53 mm. FIG. 10B is a diagram showing transmitted rays, refracted rays, and total reflected rays when the center thickness of the lens body is 0.25 mm. FIG. 11 is a diagram showing the stray light intensity of the refracted ray and the total reflected ray with respect to the center thickness of the lens body of the crystalline lens intraocular lens according to the second embodiment. FIG. 12A is a diagram showing a hole in the lens body of the crystalline lens intraocular lens according to the third embodiment, which is tapered and has a light absorption film coated on the inner peripheral surface. FIG. 12B is a diagram showing how stray light is absorbed by the light absorption film applied to the hole shown in FIG. 12A. FIG. 13A is a diagram showing a hole in the lens body of the crystalline lens intraocular lens according to the fourth embodiment, which is tapered and has a light diffusing film formed on the inner peripheral surface. FIG. 13B is a diagram showing how stray light is diffused by processing a light diffusing film formed in the hole shown in FIG. 13A or a fine uneven surface. FIG. 14A is a top view of the light blocking film formed in the hole of the lens body of the crystalline lens intraocular lens according to the fifth embodiment. FIG. 14B is a side view showing a light blocking film formed in the hole of the lens body. FIG. 15 is a diagram showing how the light blocking film blocks the light from the aqueous humor at the portion where total internal reflection occurs on the lower surface side of the hole of the lens body. FIG. 16 is a diagram for deriving a calculation formula of a blocking width of a light blocking film that blocks light in a portion where total reflection occurs when the hole has no taper. FIG. 17 is a diagram for deriving a calculation formula for the blocking width of the light blocking film that blocks the light in the portion where total reflection occurs when the hole has a taper. FIG. 18A is a diagram showing a refracted ray and a total reflected ray when the hole has no taper and the blocking width of the light blocking film is 0.0 mm. FIG. 18B is a diagram showing the transmitted light rays and the totally reflected light rays of the hole under the conditions shown in FIG. 18A. FIG. 19A is a diagram showing a refracted ray and a total reflected ray when the hole has no taper and the blocking width of the light blocking film is 0.01 mm. FIG. 19B is a diagram showing the transmitted light rays and the totally reflected light rays of the hole under the conditions shown in FIG. 19A. FIG. 20A is a diagram showing a refracted ray and a total reflected ray when the hole has no taper and the blocking width of the light blocking film is 0.02 mm. FIG. 20B is a diagram showing the transmitted light rays and the totally reflected light rays of the hole under the conditions shown in FIG. 20A. FIG. 21 is a diagram showing the relationship between the light incident angle, the blocking width of the light blocking film, and the irradiance power when the taper of the hole is 1.0 and 0.9. FIG. 22 is a diagram showing the relationship between the incident angle of light and the blocking width of the light blocking film required to eliminate the halo when the taper of the hole is 1.0 and 0.9. FIG. 23 is a diagram showing the relationship between the incident angle of light and the blocking width of the created calculation formula and the calculation result of the optical simulation software when the taper is 1.0. FIG. 24A is a diagram showing a hemispherical three-dimensional texture formed in the hole of the lens body of the crystalline lens intraocular lens according to the sixth embodiment. FIG. 24B is a diagram in which a plurality of hemispherical three-dimensional textures shown in FIG. 24A are arranged on the inner peripheral surface of the hole. FIG. 24C is a cross-sectional view in which a plurality of hemispherical three-dimensional textures shown in FIG. 24A are arranged on the inner peripheral surface of the hole. FIG. 25A is a diagram showing a trapezoidal three-dimensional texture having a rectangular base. FIG. 25B is a diagram in which a plurality of trapezoidal three-dimensional textures shown in FIG. 25A are arranged on the inner peripheral surface of the hole. FIG. 25C is a cross-sectional view in which a plurality of hemispherical three-dimensional textures shown in FIG. 25A are arranged on the inner peripheral surface of the hole. FIG. 26A is a diagram showing a pyramid-shaped three-dimensional texture having a square base. FIG. 26B is a diagram in which a plurality of three-dimensional textures shown in FIG. 26A are arranged on the inner peripheral surface of the hole. FIG. 26C is a cross-sectional view in which a plurality of hemispherical three-dimensional textures shown in FIG. 26A are arranged on the inner peripheral surface of the hole. FIG. 27 is a diagram showing transmitted rays and total reflected rays when the holes do not have a three-dimensional texture. FIG. 28 is a diagram showing the diffusion of stray light when the hole has a hemispherical three-dimensional texture.

Hereinafter, the crystalline intraocular lens according to some embodiments of the present invention will be described in detail with reference to the drawings.

(First Embodiment)
FIG. 1 is a diagram showing a configuration of a crystalline lens intraocular lens according to the first embodiment of the present invention. The phakic intraocular lens 1 according to Example 1 of the present invention is made of a collagen copolymer material, Collamer, and is implanted between the iris and the crystalline lens. The crystalline lens intraocular lens 1 includes a lens body 5 arranged in a central portion and a support portion 3 arranged outside the lens body 5 and supporting the lens body 5.

Reference numerals 4a and 4b are markings for the crystalline intraocular lens and are provided on the outside of the lens body 5. One small circular hole 6 is formed in the center of the lens body 5.

FIG. 2 is a cross-sectional side view of an eye having a crystalline lens intraocular lens according to the first embodiment of the present invention. As shown in FIG. 2, the eye 8 has a cornea 9, a crystalline lens 10, an iris 11, an anterior chamber 13 and a posterior chamber 14. The crystalline lens intraocular lens 1 is implanted between the iris 11 and the crystalline lens 10. A gap 12 is provided between the crystalline lens intraocular lens 1 and the crystalline lens 10. The aqueous humor in the posterior chamber 14 passes through the gap 12 and the hole 6 in the lens body 5 and flows into the anterior chamber 13.

FIG. 3 is a diagram showing transmitted rays, refracted rays, and total reflected rays when incident light is incident on the hole 6 of the lens body 5 from the anterior chamber 13. As shown in FIG. 3, the lens body 5 is composed of a concave lens, and the incident light to the hole 6 is a transmitted ray 21 that passes through the hole 6 as it is, a refracted ray 22 that is refracted by the hole 6, and total internal reflection at the hole 6. It is divided into the total reflected light beam 23. The refracted ray 22 and the reflected ray 23 are stray light.

Here, the refractive index n0 of the cornea 9 is, for example, 1.376. The refractive index n1 of the aqueous humor is, for example, 1.337. The refractive index n2 of the lens body 5 is, for example, 1.46. The refractive index n3 of the crystalline lens 10 is, for example, 1.336. The off-axis is, for example, 3 °, and the number of light rays is, for example, 5,000,000.

The refracted ray 22 and the reflected ray 23 shown in FIG. 3 can be understood by the explanation of the refracted ray shown in FIG. 4A and the explanation of the reflected light ray shown in FIG. 4B.

As shown in FIGS. 3 and 4A, the aqueous humor having a refractive index n1 and the lens body 5 having a refractive index n2 come into contact with each other, and the incident light is transferred from the aqueous humor having a refractive index n1 to the hole 6 of the lens body 5 having a refractive index n2. It is incident on the upper surface 6A. At this time, since the refractive index n2 of the lens body 5 is larger than the refractive index n1 of the bunch of water, the emission angle θt is smaller than the incident angle θi, and the refracted ray 22 is refracted.

Further, as shown in FIGS. 3 and 4B, the incident light is incident on the lower surface 6B of the hole 6 of the lens body 5 having the refractive index n2 from the aqueous humor having the refractive index n1. At this time, since the refractive index n2 of the lens body 5 is larger than the refractive index n1 of the bunch of water, the incident light is reflected by the lower surface 6B of the hole 6, and the reflected light ray 23 emits substantially the same as the incident angle θi. It emits at an angle θr.

FIG. 5 is a diagram showing the stray light intensity of the refracted light ray and the stray light intensity of the total reflected light ray with respect to the pore diameter. Here, the radiant power is, for example, 1 W.

As shown in FIG. 5, as the hole diameter (diameter) of the hole 6 becomes larger, the stray light intensity of the refracted ray 22 and the stray light intensity of the total reflected light ray 23 become larger. In particular, it can be seen that the stray light intensity of the total reflected light ray is higher than the stray light intensity of the refracted light ray.

The diameter of the pore diameter is, for example, 10 nm to 1.0 mm. When the pore diameter is 0.1 mm, the stray light intensity is 0.01%. When the hole diameter is 0.36 mm, the stray light intensity is 0.04%. Therefore, the diameter of the hole 6 is preferably 0.1 mm to 0.2 mm.

(Countermeasures against stray light in the first embodiment)
FIG. 6A is a diagram showing a hole formed in a tapered shape so that the hole diameter on the incident side of the crystalline lens intraocular lens according to the first embodiment is larger than the hole diameter on the exit side. The hole 60 of the lens body 5 shown in FIG. 6A is formed in a tapered shape so that the hole diameter d1 on the incident side of the incident light is larger than the hole diameter d2 on the exit side. This taper may be linearly inclined, may be a curved line such as a parabola, or may be inclined with an arbitrary shape. The ratio of the hole diameter d2 to the hole diameter d1, that is, (d2 / d1) is defined as the taper ratio.

FIG. 6B is a diagram showing a transmitted ray 21, a refracted ray 22, and a total reflected ray 23 in a hole having a taper ratio of 1.0. In the case of the hole 6 having a taper ratio of 1.0, the incident light is refracted and reflected near the entrance of the hole 6 to become the refracted ray 22 and the total reflected ray 23. Therefore, the total reflected light rays 23 increase within a predetermined range.

FIG. 7A shows the spots on the retinal surface of the transmitted ray 21 and the total reflected ray 23 of the hole 6 having a taper ratio of 1.0. Within the predetermined range, as shown in FIG. 7A, for example, the X direction is -1 mm to 1 mm and the Y direction is -1 mm to 1 mm. Here, the X direction and the Y direction are set in the incident surface of the lens body 5, and the thickness direction of the hole 60, that is, the direction in which the transmitted light ray 21 travels is set in the Z direction. As shown in FIG. 7A, the total reflected light rays 23 appear in a circle within a predetermined range.

On the other hand, in the case of the hole 60 having a taper ratio of, for example, 0.85 shown in FIG. 6C, the incident light is refracted from substantially the center of the hole 60 in the thickness direction to the emission side in the upper surface taper 60a of the hole 60. Since the refracted rays 22 are formed, the number of refracted rays 22 is smaller than that of the refracted rays 22 of the hole 6 having a taper ratio of 1.0.

Further, the incident light is totally reflected at the lower surface taper 60b of the hole 60 while changing the angle due to the inclination of the lower surface taper 60b from the incident end to the emission end of the hole 60. Therefore, the reflected light rays 23 are dispersed in the radial direction, and as shown in FIG. 7B, the spots due to the total reflected light rays are within a predetermined range (for example, -1 mm to 1 mm in the X direction and -1 mm to 1 mm in the Y direction). It disappears completely, and only a few small spots appear as dots even outside the specified range. That is, by setting the taper ratio of the holes 60 to 0.85, stray light can be significantly reduced.

FIG. 8A is a diagram showing a hole 61 formed in a tapered shape so that the hole diameter d1 on the incident side of the crystalline intraocular lens according to the first embodiment is smaller than the hole diameter d2 on the exit side. FIG. 8B is a diagram showing a refracted ray and a total reflected ray in a hole having a taper ratio of, for example, 1.2. FIG. 8C is a diagram showing a refracted ray 22 and a total reflected ray 23 in a hole having a taper ratio of 1.2.

In the case of the hole 61 having a taper ratio of 1.2, the upper surface taper 61a and the lower surface taper 61b of the hole 61 spread from the incident end to the emitted end, so that the incident light is substantially near the center in the thickness direction of the hole 61. Total internal reflection is caused by the inclination of the tapers 61a and 61b. Therefore, the dispersion of the total reflected light rays 23 in the radial direction becomes small.

In this case, as shown in FIG. 8C, the spot due to the total reflected light beam does not appear within the predetermined range, but a large circular spot due to the total reflected light ray 23 appears outside the predetermined range. Therefore, it is inappropriate to set the taper ratio to 1.2.

FIG. 9 is a diagram showing the power of the total reflected ray 23 and the refracted ray 22 with respect to the taper value. From FIG. 9, the taper ratio in which the total reflected ray 23 is not generated and the refracted ray 22 is smaller, that is, the optimum taper ratio is 0.85. Even if the taper ratio is 0.8 to 0.9, almost no total reflected light rays are generated, so the taper ratio may be set in this range.

As described above, according to the crystalline intraocular lens 1 according to the first embodiment, the hole 60 is formed in a tapered shape so that the hole diameter d1 on the incident side of the lens body 5 is larger than the hole diameter d2 on the exit side. By setting the taper ratio of the holes 60 to 0.85, stray light can be significantly reduced. Further, the taper ratio of the hole 60 is not limited to 0.85, and even if the taper ratio is 0.8 to 0.9, stray light can be significantly reduced.

(Second embodiment)
FIG. 10A is a diagram showing a transmitted ray 21, a refracted ray 22, and a total reflected ray 23 when the center thickness t of the lens body 5 of the crystalline lens intraocular lens according to the second embodiment is, for example, 0.53 mm. FIG. 10B is a diagram showing a transmitted ray 21, a refracted ray 22, and a total reflected ray 23 when the center thickness of the lens body is, for example, 0.25 mm. FIG. 11 is a diagram showing the stray light intensity of the refracted ray 22 and the total reflected ray 23 with respect to the center thickness of the lens body 5 of the crystalline lens intraocular lens according to the second embodiment.

As shown in FIG. 11, it can be seen that the stray light intensity with a center thickness of 0.25 mm of the lens body 5 is smaller than the stray light intensity with a center thickness of 0.53 mm. When the center thickness is 0.25 mm, the stray light intensity of the refracted ray 22 is about 0.01%, and the stray light intensity of the total reflected light ray 23 is about 0.018%.

Further, when the taper ratio of the holes is set to, for example, 0.85 and the center thickness of the lens body 5 is set to, for example, 0.2 mm, the stray light intensity is further reduced. Therefore, it is preferable to set the taper ratio of the holes to 0.85 and the center thickness of the lens body 5 to 0.2 to 0.3 mm.

Further, when the taper ratio of the holes is set to, for example, 0.85 and the hole diameter of the lens body 5 is set to, for example, 0.2 mm, the stray light intensity is further reduced. Therefore, it is preferable to set the taper ratio of the holes to 0.85 and the hole diameter of the lens body 5 to 0.1 to 0.2 mm.

(Third embodiment)
The crystalline lens intraocular lens according to the third embodiment shown in FIG. 12A is different from the crystalline lens intraocular lens according to the first embodiment shown in FIG. 6A in that a light absorbing film 71 is added. The details will be described below.

In the lens body 5 shown in FIG. 12A, the hole 62 is formed in a tapered shape so that the hole diameter d1 on the incident side of the incident light is larger than the hole diameter d2 on the exit side. In this case, the taper ratio of the hole 62 is, for example, 0.85. A light absorption film 71 is coated on the inner peripheral surface of the upper surface taper 61a and the lower surface taper 61b.

For example, black fine particles or a black dye are mixed in the light absorption film 71. For example, aniline black, cyanine black, carbon, titanium black, black iron oxide, chromium oxide, manganese oxide and the like are mixed with the resin.

In this way, the taper ratio of the holes 62 is set to 0.85, and the light absorption film 71 is coated on the inner peripheral surfaces of the upper surface taper 61a and the lower surface taper 61b. The 71 can absorb the refracted light 22 and the total reflected light 23 generated by the upper surface taper 61a and the lower surface taper 61b. Therefore, the stray light generated by the hole 62 can be further reduced.

(Fourth Embodiment)
FIG. 13A is different from the crystalline lens intraocular lens according to the fourth embodiment in that a light diffusing film 72 is added to the crystalline lens intraocular lens according to the first embodiment shown in FIG. 6A. The details will be described below.

In the lens body 5 shown in FIG. 13A, the hole 63 is formed in a tapered shape so that the hole diameter d1 on the incident side of the incident light is larger than the hole diameter d2 on the exit side. In this case, the taper ratio of the hole 63 is, for example, 0.85. A light diffusing film 72 is coated on the inner peripheral surface of the upper surface taper 61a and the lower surface taper 61b.

Examples of the light diffusion film 72 include white inorganic particles such as titanium dioxide, zinc sulfide, zinc oxide, alumina, magnesium oxide, calcium carbonate and barium sulfate, and white organic particles such as fluorine particles.

In this way, the taper ratio of the hole 63 is set to 0.85, and the light diffusing film 72 is coated on the inner peripheral surface of the upper surface taper 61a and the lower surface taper 61b. With 72, the refracted light rays 22 and the total reflected light rays 23 generated by the upper surface taper 61a and the lower surface taper 61b can be diffused. Therefore, the stray light generated by the hole 63 can be further reduced.

Further, even if the inner peripheral surface is processed into a fine uneven surface instead of the light diffusing film 72, the same effect as that of the light diffusing film 72 can be obtained.

(Fifth Embodiment)
FIG. 14A is a top view of the light blocking film 81 formed in the hole 6 of the lens body 5 of the crystalline lens intraocular lens according to the fifth embodiment. FIG. 14B is a side view showing the light blocking film 81 formed in the hole 6 of the lens body 5.

The light blocking film 81 is formed on the light incident side of the hole 6 of the lens body 5 and on the outer peripheral surface of the hole 6. The light blocking film 81 blocks light in a portion where total reflection occurs, and is made of a light absorbing material.

The light blocking film 81 is polyvinylidene, a copolymer of hydroxyethyl methacrylate and methyl methacrylate (HEMA / MMA), a microporous hydrogel, a polyvinylidine fluoride polymer, acrylic, silicone, PMMA and the like.

The hole diameter of the hole 6 of the lens body 5 is, for example, 0.36 mm, and the blocking width S of the light blocking film 81 is, for example, 0.01 mm. It is 0.02 mm. The diameter of the pore diameter is 10 nm to 0.5 mm.

FIG. 15 is a diagram showing how the light blocking film 81 blocks light from the aqueous humor at a portion where total internal reflection occurs on the lower surface side of the hole 6 of the lens body 5. FIG. 15 is a diagram showing a state in which FIG. 14B is rotated 90 degrees in the counterclockwise direction. Incident light is incident on the lens body 5 having a refractive index n2 from the aqueous humor having a refractive index n1.

When the incident light is incident on the point O of the hole 6 at the incident angle θ, the refracted ray 22 disappears. Total internal reflection occurs when light is incident at an incident angle θ1 formed by a straight line perpendicular to the surface of the blocking film 81 and the incident light.

Therefore, the blocking width S of the light blocking film 81 is set so as to block the total reflected light at the time of light incident at the incident angle θ1.

FIG. 16 is a diagram for deriving a calculation formula of the blocking width S of the light blocking film 81 that blocks the light in the portion where total reflection occurs when the hole 6 has no taper.

The light blocking film 81 is incident with incident light at an incident angle θ1 formed by a straight line (normal) perpendicular to the surface of the light blocking film 81 to which the incident light from the bunch of water having a refractive index n1 hits and the incident light. Blocks incident light when fully reflected.

In FIG. 16, when the hole 6 has no taper, the incident light incident at the incident angle θ1 is refracted at the angle θ2 in the lens body 5, and the refracted light beam is totally reflected at the emission end O of the hole 6. Shows. The thickness at the center of the lens body 5 is t.

From Snell's law, equation (1) holds.

n1 × sinθ1 = n2 × sinθ2 ... (1)
Equation (2) is obtained from equation (1).
sinθ2 = (n1 × sinθ1) / n2 ... (2)
S = t × tan θ2 ... (3)
Equation (4) is obtained from equation (2) and equation (3). That is, the blocking width S of the light blocking film 81 when the hole 6 has no taper is set by the equation (4).
S = t × tan {sin ^-1 (n1 × sin θ1 / n2)} ... (4)
From the above, when the hole 6 has no taper, the blocking width S of the light blocking film 81 is the incident angle θ1, the refractive index n1 of the aqueous humor, the refractive index n2 of the lens body, and the thickness t at the center of the lens body. It is set based on.

Since the aqueous humor refractive index n1, the lens refractive index n2, and the thickness t of the lens body 5 are predetermined values, the cutoff width S is set according to the incident angle θ.

FIG. 17 is a diagram for deriving a calculation formula for the blocking width of the light blocking film that blocks the light in the portion where total reflection occurs when the hole 6 has a taper. The hole 6 has a diameter d1 on the incident side and a diameter d2 on the exit side.

The cutoff width S1 shown in FIG. 17 is shorter than the cutoff width S shown in FIG. 16 by the length of points a-point b. The length between the points a and b is the difference between the radius of the hole 6 on the incident side (d1 / 2) and the radius of the hole 6 on the exit side (d2 / 2). That is, its length is represented by (d1-d2) / 2.

Therefore, the blocking width S1 of the light blocking film 81 when the hole 6 has a taper is represented by the formula (5).
S1 = t × tan (sin ^-1 (n1 × sin θ1 / n2))-(d1-d2) / 2 ... (5)
From the above, when the hole 6 has a taper, the blocking width S1 of the light blocking film 81 is the incident angle θ1, the refractive index n1 of the aqueous humor, the refractive index n2 of the lens body, and the thickness t at the center of the lens body. It is set based on the hole diameter d1 on the incident side and the hole diameter d2 on the exit side.

Since the aqueous humor refractive index n1, the lens refractive index n2, the thickness t of the lens body 5, the diameter d1 on the incident side of the hole 6, and the diameter d2 on the exit side of the hole 6 are predetermined values, the cutoff width S is determined. It is set according to the incident angle θ.

FIG. 18A is a diagram showing a refracted ray and a total reflected ray when the hole 6 has no taper and the blocking width S of the light blocking film 81 is 0.0 mm. That is, FIG. 18A is an example in the case where the light blocking film 81 is not provided.

FIG. 18B is a diagram showing a transmitted ray 21 and a total reflected ray 23 of the hole 6 under the conditions shown in FIG. 18A. In the absence of the light blocking film 81, there are a large number of transmitted rays 21 and total reflected rays 23.

FIG. 19A is a diagram showing a refracting ray 21 and a total reflected ray 23 when the hole 6 has no taper and the blocking width S of the light blocking film 81 is 0.01 mm. FIG. 19B is a diagram showing a transmitted ray 21 and a total reflected ray 23 of the hole 6 under the conditions shown in FIG. 19A. When the blocking width S of the light blocking film 81 is 0.01 mm, the total reflected light rays 23 are reduced as shown in FIG. 19B.

FIG. 20A is a diagram showing a refracting ray 21 when the hole 6 has no taper and the blocking width of the light blocking film 81 is 0.02 mm. FIG. 20B is a diagram showing the transmitted light rays of the hole 6 under the conditions shown in FIG. 20A. When the blocking width of the light blocking film 81 is 0.02 mm, all the reflected light rays 23 are eliminated.

When the incident angle θ1 is 3 degrees and there is no taper, the irradiance power becomes zero when the blocking width of the blocking film 81 is 0.02 mm. That is, the total reflected ray 23 becomes zero. When the incident angle θ1 is 3 degrees and the taper is 0.9, the irradiance power becomes zero when the blocking width of the blocking film 81 is 0.01 mm.

When the incident angle θ1 is 5 degrees and there is no taper, the irradiance power becomes zero when the blocking width of the blocking film 81 is 0.03 mm. When the incident angle θ1 is 5 degrees and the taper is 0.9, the irradiance power becomes zero when the blocking width of the blocking film 81 is 0.02 mm.

When the incident angle θ1 is 7 degrees and there is no taper, the irradiance power becomes zero when the blocking width of the blocking film 81 is 0.05 mm. When the incident angle θ1 is 7 degrees and the taper is 0.9, the irradiance power becomes zero when the blocking width of the blocking film 81 is 0.03 mm.

When the incident angle θ1 is 9 degrees and there is no taper, the irradiance power becomes zero when the blocking width of the blocking film 81 is 0.06 mm. When the incident angle θ1 is 9 degrees and the taper is 0.9, the irradiance power becomes zero when the blocking width of the blocking film 81 is 0.05 mm.

When the incident angle θ1 is 11 degrees and there is no taper, the irradiance power becomes zero when the blocking width of the blocking film 81 is 0.08 mm. When the incident angle θ1 is 11 degrees and the taper is 0.9, the irradiance power becomes zero when the blocking width of the blocking film 81 is 0.06 mm.

From the above, regardless of the presence or absence of the taper, the smaller the incident angle θ1 is, the smaller the cutoff width S is, and the larger the incident angle θ1 is, the larger the cutoff width S is set.

Further, when the cutoff width S when there is no taper and the cutoff width S1 when there is a taper are the same, the incident angle θ1 when there is a taper is larger than the incident angle θ1 when there is no taper. There is. Therefore, by forming the taper in the hole 6 and providing the blocking film 81, the incident angle θ1 can be increased and the total reflection prevention effect is increased.

Even when there is no taper (taper is 1.0), total reflected light can be prevented by providing the blocking film 81 and setting the blocking width S according to the incident angle θ1.

FIG. 22 is a diagram showing the relationship between the incident angle of light and the blocking width S of the light blocking film 81 required to eliminate the halo when the taper of the hole 6 is 1.0 and 0.9.

The calculation formula for obtaining the blocking width S of the light blocking film 81 when the taper is 1.0 is
y = 0.0002x ² + 0.005x + 0.0028 ... (6)
Is. x is the angle of incidence of the light beam. y is the blocking width S of the light blocking film 81. R ² = 0.99.

In the calculation formula of the formula (6), each incident angle when the taper is 1.0 shown in FIG. 21 and each cutoff width S where the irradiance power becomes zero are plotted, and the plot data is used by the least squares method. Calculated and calculated.

The calculation formula for obtaining the blocking width S of the light blocking film 81 when the taper is 0.9 is
y = 0.0021 x ^1.4064 ... (7)
Is. x is the angle of incidence of the light beam. y is the blocking width S of the light blocking film 81. R ² = 0.9937.

In the calculation formula of the formula (7), each incident angle when the taper is 0.9 shown in FIG. 21 and each cutoff width S where the irradiance power becomes zero are plotted, and the plot data is used by the least squares method. Calculated and calculated.

FIG. 23 is a diagram showing the relationship between the incident angle of light and the blocking width of the created calculation formula and the calculation result of the optical simulation software when the taper is 1.0.

y = 0.0002x ² + 0.005x + 0.0028
This calculation formula is the calculation formula of the formula (6), and is the result of calculation by the optical simulation software.

y = 2E- ⁰⁵ x ² + 0.0079 x + 0.0028 ... (8)
Equation (8) is a creation calculation equation.

The error between the created calculation formula and the calculation result of the optical simulation software is about 10 μm. This error is presumed to be due to the shape of the cornea.

(Sixth Embodiment)
FIG. 24A is a diagram showing a hemispherical three-dimensional texture 91 formed in the hole 6 of the lens body of the crystalline lens intraocular lens according to the sixth embodiment. FIG. 24B is a diagram in which a plurality of hemispherical three-dimensional textures 91 shown in FIG. 24A are arranged on the inner peripheral surface of the hole 6. FIG. 24C is a cross-sectional view in which a plurality of hemispherical three-dimensional textures 91 shown in FIG. 24A are arranged on the inner peripheral surface of the hole 6. The hemispherical three-dimensional texture 91 may be a convex or concave hemisphere.

By forming the hemispherical three-dimensional texture 91 in the hole 6, the incident light is diffused by the hemispherical three-dimensional texture 91, so that the total reflected light can be significantly reduced.

FIG. 25A is a diagram showing a trapezoidal three-dimensional texture 92 in which the base 92a and the upper base 92b form a rectangle. FIG. 25B is a diagram in which a plurality of trapezoidal three-dimensional textures 92 shown in FIG. 25A are arranged on the inner peripheral surface of the hole 6. FIG. 25C is a cross-sectional view in which a plurality of hemispherical three-dimensional textures 91 shown in FIG. 25A are arranged on the inner peripheral surface of the hole 6. The trapezoidal three-dimensional texture 92 is a prism, and the area of the upper base 92b is smaller than the area of the base 92a.

By forming the rectangular trapezoidal three-dimensional texture 92 in the hole 6, the incident light is diffused by the trapezoidal three-dimensional texture 92, so that the total reflected light can be significantly reduced.

FIG. 26A is a diagram showing a pyramid-shaped three-dimensional texture 93 in which the base 93a and the upper base 93b form a square. FIG. 26B is a diagram in which a plurality of pyramid-shaped three-dimensional textures 93 shown in FIG. 26A are arranged on the inner peripheral surface of the hole 6. FIG. 26C is a cross-sectional view in which a plurality of hemispherical three-dimensional textures 91 shown in FIG. 26A are arranged on the inner peripheral surface of the hole 6.

By forming the pyramid-shaped three-dimensional texture 93 forming a square in the hole 6, the incident light is diffused by the three-dimensional texture 93, so that the total reflected light can be significantly reduced.

FIG. 27 is a diagram showing a transmitted ray 21 and a total reflected ray 23 when the hole 6 has no three-dimensional texture. FIG. 28 is a diagram showing the diffusion of stray light when the hole 6 has a hemispherical three-dimensional texture 91. It can be seen from FIG. 28 that the stray light is diffused by providing the hemispherical three-dimensional texture 91.

The present invention is not limited to the crystalline intraocular lens according to the first to fourth embodiments. In the crystalline lens intraocular lens according to the first to fourth embodiments, only the inner peripheral surface of the hole is tapered, but the edge portion of the hole may also be tapered.

Further, in the crystalline intraocular lens according to the first to fourth embodiments, a hole is provided in the center of the lens body 5, but the hole is not limited to this, and the hole is not limited to the center of the lens body 5. May be provided.

The present invention is applicable to an intraocular lens implanted between the iris and the crystalline lens.

Claims (12)

An intraocular lens with a crystalline lens that is implanted between the iris and the crystalline lens.
The lens body, which is located in the center and has holes,
It is provided with a support portion arranged on the outside of the lens body and supporting the lens body.
The holes are formed in a tapered shape so that the hole diameter on the incident side where the incident light is incident is larger than the hole diameter on the exit side .
A light blocking film formed on the light incident side of the hole and on the outer peripheral surface of the hole is provided, and the light blocking film is a straight line perpendicular to the surface of the light blocking film to which the incident light hits and the incident light. A crystalline lens intraocular lens that blocks the incident light when the incident light is incident and totally reflected at the incident angle θ1 . The crystalline intraocular lens according to claim 1, wherein the blocking width S of the light blocking film is set larger as the incident angle θ1 increases. The blocking width S of the light blocking film includes the incident angle θ1, the refractive index n1 of the bunch of water, the refractive index n2 of the lens body, the thickness t at the center of the lens body, the hole diameter d1 on the incident side, and the emission side. The crystalline intraocular lens according to claim 1, which is set based on the pore diameter d2. The blocking width S of the light blocking film is
S = t × tan {sin ^-1 (N1 × sinθ1 / n2)}-(d1-d2) / 2
3. The crystalline intraocular lens according to claim 3. The crystalline intraocular lens according to claim 1, wherein the taper ratio of the pore diameter on the exit side to the pore diameter on the incident side is 0.8 to 0.9. The crystalline intraocular lens according to claim 1 , wherein the thickness at the center of the lens body is 0.2 mm to 0.3 mm. The crystalline intraocular lens according to claim 1 , wherein the pore diameter is 0.1 mm to 0.2 mm. The inner peripheral surface of the hole is coated with a light absorbing film that absorbs a refracting ray that the incident light refracts on the inner peripheral surface and a reflected light ray that the incident light reflects on the inner peripheral surface. The crystalline intraocular lens according to 1. The inner peripheral surface of the hole is coated with a light diffusing film that diffuses a refracted ray that the incident light refracts on the inner peripheral surface and a reflected light ray that the incident light reflects on the inner peripheral surface. The crystalline intraocular lens according to 1. A three-dimensional texture is formed on the inner peripheral surface of the hole to diffuse a refracted ray that the incident light refracts on the inner peripheral surface and a reflected ray that the incident light reflects on the inner peripheral surface. The crystalline intraocular lens according to item 1 . The crystalline intraocular lens according to claim 10 , wherein the three-dimensional texture is hemispherical and is arranged in a plurality of holes. The crystalline intraocular lens according to claim 10 , wherein the three-dimensional texture has a trapezoidal shape and is arranged in a plurality of holes.

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