CN104678572B - Ophthalmic len - Google Patents

Abstract

A kind of ophthalmic len is provided, which can show the function for the ametropic development for suppressing eyes, while ensure sufficiently visual and good wearing sense.The ophthalmic len includes：First dioptric region, it has the first refractive power of the ametropia prescription based on correction ocular；With the second dioptric region, it has the refractive power different from the first refractive power, and have the function of image focu on the position in addition to the retina except eyes to suppress the ametropic development of eyes, wherein, near the central part of eyeglass, second dioptric region is formed multiple island-shaped area domains independent of each other, and the first dioptric region is formed the region in addition to the region for being formed as the second dioptric region.

Description

spectacle lenses

technical field

The present invention relates to a spectacle lens having a function of suppressing the development of refractive errors of myopia and hyperopia in human eyes.

Background technique

As a lens having a function of suppressing the development of ametropia of myopia and hyperopia in human eyes, for example, a lens described in Patent Document 1 (Japanese Patent No. 4891249 ) is known.

The lens described in Patent Document 1 is a concentric Fresnel multifocus lens. That is, the lens is a lens in which a plurality of refraction areas (refraction areas) are arranged concentrically in the lens, wherein at least one refraction area as the first refraction area among these refraction areas has The refractive error is the first refractive power of the prescription. Also, the refractive areas other than the first refractive area have at least one refractive power different from the first refractive power, respectively.

The refractive area other than the first refractive area may be a second refractive area having only a second refractive power different from the first refractive power, or may be a plurality of refractive areas having a plurality of different refractive powers from each other, like A third refractive area having a third refractive power other than the second refractive area, and a fourth refractive area having a fourth refractive power,  … .

Furthermore, in the above lens, the region having the first refractive power has the function of focusing an image on the retina of the eye. On the other hand, for example, when constituting a lens that suppresses the progression of myopia, the refractive regions other than the refractive region having the first refractive power are formed of a material having a function of focusing an image to a point in front of the retina of the eye. Therefore, when a patient sees an object using a lens for suppressing myopia, an image of the object is formed on the retina, and an image is formed at a point in front of the retina at the same time. Therefore, it is possible to obtain the effect of suppressing the progression of myopia by the image formed in front of the retina by the refractive power other than the first refractive power while visually recognizing the image of the object formed by the first refractive power.

prior art literature

patent documents

Patent Document 1: Japanese Patent No. 4891249

Contents of the invention

The problem to be solved by the invention

Incidentally, the conventional lenses mentioned above are so-called concentric Fresnel multifocal lenses. When applied to a case where the lens moves with the eye, such as a contact lens, such a concentric multifocal lens has few problems, and the relative positional relationship between the eye and the lens is hardly changed.

However, when a concentric Fresnel multifocal lens is applied to an eyeglass lens, there is no problem if an object is viewed through a line of sight passing through the center of the lens. However, when the line of sight passes through a position away from the center of the lens, an image of an object is formed in such a manner that the image formed by the first refraction area and the image formed by the second refraction area are viewed in different directions, respectively, This leads to double viewing of objects, making it difficult to use such lenses as spectacle lenses.

An object of the present invention is to provide a spectacle lens capable of exhibiting a function of suppressing the development of ametropia of the eye while ensuring sufficient visibility and a good wearing feeling.

solutions to problems

The means for solving the above-mentioned problems are as follows.

(1) A spectacle lens comprising:

a first refractive zone having a first refractive power based on a prescription for correcting the refractive error of the eye; and

a second refractive area having a different refractive power from the first refractive power and having a function of focusing an image on a position other than the retina of the eye to suppress the development of refractive error of the eye,

Wherein, near the central portion of the lens, the second refractive area is formed as a plurality of island-shaped areas independent of each other, and

The first refraction area is formed as an area other than the area formed as the second refraction area.

(2) The spectacle lens according to (1), wherein the spectacle lens is a spectacle lens having a function of suppressing the progression of myopia, and the second refractive area has a function increased by adding a positive refractive power to the first refractive power. Gained refractive power.

(3) The spectacle lens according to (1), wherein the spectacle lens is a spectacle lens having a function of suppressing the development of hyperopia, and the second refractive area has a refractive power increased by adding a negative refractive power to the first refractive power. Gained refractive power.

(4) The spectacle lens according to any one of (1) to (3), wherein the area of each independent island-shaped second refracting region is 0.50 mm ² to 3.14 mm ² .

(5) The spectacle lens according to any one of (1) to (4), wherein the second refracting region is formed in a circular region having a radius of 20 mm centering on the optical center of the spectacle lens .

(6) The spectacle lens according to any one of (1) to (5), wherein the second refractive region is not formed at a radius of 2.5 mm to 10.0 mm centering on the optical center of the spectacle lens circular area.

(7) The spectacle lens according to any one of (1) to (6), wherein, in a region formed by mixing the second refraction region and the first refraction region, the second refraction A ratio of the total area of the light area to the total area of the second refraction area and the first refraction area is 20% to 60%.

(8) The spectacle lens according to any one of (1) to (3), wherein the second refraction area is formed in a circular shape.

(9) The spectacle lens according to (4), wherein each circle of the circular shape has a diameter of 0.8 mm to 2.0 mm.

(10) The spectacle lens according to any one of (1) to (9), wherein the surface shape of the second refraction region is different from that of the first refraction region to make the The refractive power of the second refractive area is different from that of the first refractive area.

(11) The spectacle lens according to (10), wherein a surface shape of the second refraction region is formed in a convex shape or a concave shape toward the object side with respect to the surface shape of the first refraction region.

(12) The spectacle lens according to any one of (1) to (9), wherein the second refraction region is made of a material different from that of the first refraction region so that the The second refractive area has a different refractive power from that of the first refractive area.

The effect of the invention

In the above structure, generally the first refractive area has the function of focusing the image on the retina of the eye. However, for example, in the case of forming a lens that suppresses the progression of myopia, the second refracting area is made of a material that has a function of focusing an image at a point in front of the retina of the eye. Therefore, when a patient sees an object using a lens that suppresses the progression of myopia, an image of the object is formed on the retina while an image is formed in front of the retina. That is, the lens has an effect of suppressing the progression of myopia by an image obtained in front of the retina by a refractive power other than the first refractive power while visually recognizing an image of an object formed by the first refractive power. The same can be said for the case of hyperopia, except that in the case of hyperopia, the image is focused on the rear side of the retina of the eye via the second refractive area.

Here, near the central portion of the lens, the second refraction area is formed as a plurality of mutually independent island-shaped areas, wherein the first refraction area is formed as an area other than the area formed as the second refraction area. That is,

a. A second refractive zone is formed near the center,

b. The second refraction area is formed as a plurality of independent island-shaped areas,

c. The area other than the area formed as the second refractive area is the first refractive area,

Thereby, the following effects are obtained.

d. In the state of looking forward, the line of sight passes through the approximate central portion of the lens to view the object, and therefore passes through the light beams that pass through the plurality of second refraction areas that are dispersedly arranged to be included in the first refraction area and light beams passing through the first refractive zone to view objects. As a result, the lens has an effect of suppressing the progression of myopia through the image formed in front of the retina due to the second refractive power while visually recognizing the image of the object formed by the first refractive power.

e. When the eyes move, the line of sight deviates from the central part and passes through the peripheral part. However, the peripheral portion is a region having a prescription-based refractive power (the region having the first refractive power), so objects can be recognized very well, and the wearer hardly feels discomfort even if the eyes move. Therefore, it is possible to exhibit a function of suppressing the development of refractive error of the eye while ensuring sufficient visibility and a good wearing feeling.

Description of drawings

Fig. 1 is a plan view of an ophthalmic lens according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG. 1 .

Fig. 3 is a cross-sectional view of the spectacle lens shown in Fig. 1 .

FIG. 4 is an enlarged view of part A of FIG. 3 .

5 is an explanatory diagram of a beam trajectory of the spectacle lens according to the embodiment of the present invention, and is a diagram schematically showing the trajectory of the beam passing through the first refraction area.

FIG. 6 is an explanatory view of a light beam trajectory of the spectacle lens according to an embodiment of the present invention, and is a diagram schematically showing a trajectory of a light beam passing through a second refraction area.

7 is an explanatory view of a light beam trajectory of the spectacle lens according to an embodiment of the present invention, and is a diagram schematically showing the trajectory of a light beam passing through a first refraction area and a second refraction area.

Fig. 8 is a cross-sectional view of an ophthalmic lens according to another embodiment of the present invention.

FIG. 9 is a partially enlarged view of part B of FIG. 8 .

Fig. 10 is a plan view of an ophthalmic lens according to another embodiment of the present invention.

Detailed ways

1 is a plan view of a spectacle lens according to an embodiment of the present invention, FIG. 2 is a partially enlarged view of FIG. 1 , FIG. 3 is a cross-sectional view of the spectacle lens shown in FIG. 1 , and FIG. 4 is an enlarged view of part A of FIG. 3 , FIG. 5 is an explanatory diagram of a beam trajectory of an ophthalmic lens according to an embodiment of the present invention, and is a diagram schematically showing a trajectory of a beam passing through a first refraction area, and FIG. 6 is a diagram according to an embodiment of the present invention. 7 is an explanatory diagram of the beam trajectory of the spectacle lens according to an embodiment of the present invention, and is a diagram schematically showing the trajectory of the beam passing through the second refraction area. A diagram schematically showing trajectories of light beams passing through a first refraction area and a second refraction area. Vision corrective spectacle lenses according to embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 4 , the spectacle lens 10 of the present embodiment is a lens capable of correcting myopia and suppressing the development of myopia. The spectacle lens 10 is a meniscus having an object-side surface 11 and an eye-side surface 12. A concave lens in which the object-side surface 11 is formed as a convex surface toward the object side, and the eye-side surface 12 is formed as a concave surface having a curvature greater than that of the object-side surface 11. This spectacle lens 10 has a first refractive area 1 and a second refractive area 2, wherein the first refractive area 1 has a first refractive power based on a prescription for correcting myopia, and the second refractive area 2 is at the center of the lens. A number of mutually independent island-shaped areas are formed nearby.

As shown in the cross-sectional views of FIGS. 3 and 4 , the object-side surface of each second refraction area 2 is formed into a convex spherical shape toward the object side, and the object-side surface has a larger object-side surface than the first refraction area 1 . The curvature of the surface is large. Therefore, the refractive power of the second refractive area 2 is greater than that of the first refractive area by 2.00D to 5.00D. Correspondingly, as shown in FIG. 5 , the image is focused on the retina of the eye in the first refractive zone, and on the other hand, as shown in FIG. 6 , the image is focused on a point in front of the retina in the second refractive zone 2 . FIG. 7 shows beam trajectories in both the first and second refraction regions.

The area of each surface of the second refractive area 2 formed as a plurality of island-shaped areas is about 0.50 mm ² to 3.14 mm ² , and each has a circular shape with a diameter d of about 0.8 mm to 2.0 mm. A plurality of island-shaped second diopter regions 2 are substantially evenly arranged near the center of the lens so that they are separated from each other by a distance substantially equal to the value of the radius d/2.

A plurality of island-shaped second refraction regions 2 are formed in such a manner as to be included in a circular region having a radius R (20 mm or less) centered on the optical center O of the lens, and for example, formed to be inscribed in a region having a radius R The circles are configured in the manner of hexagons. Here, the second refracting area 2 is not arranged in a circular area having a radius of 2.5 mm to 10.0 mm centering on the optical center O of the spectacle lens. Also, in the area formed by mixing the second refraction area and the first refraction area, the ratio of the total area of the second refraction area to the total area of the second refraction area and the first refraction area is 20 % to 60%. Therefore, while ensuring the function of suppressing the progression of myopia, sufficient visibility can be maintained and a good wearing feeling can be obtained.

8 is a cross-sectional view of an ophthalmic lens according to another embodiment of the present invention, and FIG. 9 is an enlarged view of part B of FIG. 8 . In the spectacle lenses shown in these figures, a part of the second refraction area 2 is made of a material different from the material constituting the first refraction area 1 . That is, as shown in FIG. 9 , the high refractive index material portion 21 having a large refractive index is provided in the second refractive area in a substantially plano-convex shape inward from the surface of the second refractive area 2 in the thickness direction. 2. Also with this structure, the same function as that of the second refraction area of the above-described embodiment can be obtained. In this case, for example, a plastic material that is a CR39 material made of thermosetting allyl resin having a refractive index of 1.5 can be used as the material for constituting the first refractive region 1 ; For example, a plastic material made of thermosetting polythiourethane resin having a refractive index of 1.67 can be used as the high refractive material.

Fig. 10 is a plan view of an ophthalmic lens according to another embodiment of the present invention. In the ophthalmic lens of the embodiment shown in FIG. 1 , the island-shaped second refraction area is not arranged in a circular area with a radius of 2.5 mm to 10.0 mm centering on the optical center O of the ophthalmic lens. In this embodiment, as shown in FIG. 10 , an island-shaped second refraction area is also arranged in a circular area with a radius of 2.5 mm to 10.0 mm centering on the optical center O. The other configurations are the same as those of the embodiment shown in FIG. 1 , so detailed description thereof will be omitted. Even in this embodiment, the effects of the present invention can be sufficiently obtained.

The above-described embodiment shows an example in which a refractive area other than the first refractive area is formed as a second refractive area having only a second refractive power different from the first refractive power. However, these refractive areas may be a plurality of refractive areas respectively having a plurality of refractive powers different from each other, like a third refractive area having a third refractive power, and a fourth refractive area having a fourth refractive power, . . . . In this case, these plurality of refraction areas are appropriately dispersed in the area where the above-mentioned second refraction area is arranged.

Explanation of reference signs

1 first refraction area

2 second refractive zone

10 spectacle lenses

11 Object side surface

12 Eye side surface

21 High Refractive Index Materials Department

Claims (12)

1. a kind of ophthalmic len, it includes：

First dioptric region, it has the first refractive power of the ametropia prescription based on correction ocular；With

Second dioptric region, it has the refractive power different from first refractive power, and has image focu except eye To suppress the function of the ametropic development of eyes on position beyond the retina of eyeball,

Wherein, near the central part of eyeglass, the second dioptric region is formed multiple island-shaped area domains independent of each other, and And

The first dioptric region is formed the region in addition to the region for being formed as the second dioptric region.

2. ophthalmic len according to claim 1, it is characterised in that the ophthalmic len is the work(with the development for suppressing myopia Can ophthalmic len, and the second dioptric region has by first refractive power increasing positive refractive power to obtain Refractive power.

3. ophthalmic len according to claim 1, it is characterised in that the ophthalmic len is the work(with the development for suppressing long sight Can ophthalmic len, and the second dioptric region has by being obtained to first refractive power increase negative refractive power Refractive power.

4. ophthalmic len according to any one of claim 1 to 3, it is characterised in that described the second of each independent island shape The area in dioptric region is 0.50mm²To 3.14mm²。

5. ophthalmic len according to any one of claim 1 to 3, it is characterised in that the second dioptric region is formed In the border circular areas of the radius with 20mm using the optical centre of the ophthalmic len as center.

6. ophthalmic len according to any one of claim 1 to 3, it is characterised in that the second dioptric region is not formed In the border circular areas of the radius with 2.5mm to 10.0mm using the optical centre of the ophthalmic len as center.

7. ophthalmic len according to any one of claim 1 to 3, it is characterised in that passing through the second dioptric region In the region being mixed to form in the first dioptric region, the gross area in the second dioptric region is bent relative to described second The ratio of the gross area in light region and the first dioptric region is 20% to 60%.

8. ophthalmic len according to any one of claim 1 to 3, it is characterised in that the second dioptric region is formed For toroidal.

9. ophthalmic len according to claim 8, it is characterised in that the diameter of a circle of each toroidal for 0.8mm extremely 2.0mm。

10. ophthalmic len according to any one of claim 1 to 3, it is characterised in that by making the second dioptric region The surface configuration in surface configuration and the first dioptric region differ refractive power and institute to make the second dioptric region The refractive power for stating the first dioptric region differs.

11. ophthalmic len according to claim 10, it is characterised in that the surface configuration in the second dioptric region is formed For the convex form or concave shape relative to the surface configuration in the first dioptric region towards object side.

12. ophthalmic len according to any one of claim 1 to 3, it is characterised in that by making the second dioptric region It is made of the material different from the material in the first dioptric region so that the second dioptric region has bends with described first The different refractive power of the refractive power in light region.