JP6817263B2 - Color vision correction lens - Google Patents

Description

The present invention relates to a color vision correction lens that assists in color discrimination of a person with color vision deficiency, and more particularly to a color vision correction lens having a transmittance curve in which the light transmittance differs depending on a wavelength.

According to the present inventor, one of the three types of pyramidal cells, L, M, and S, in which a person with color vision deficiency senses red, green, and blue light, has a sensitivity different from that of a person with normal color vision. Based on this idea, I have been engaged in the manufacture, sale, and development of color vision correction lenses.

For example, in the color vision correction lens of Patent Document 1, the M pyramidal cell that senses green light is relatively more sensitive than the L pyramidal cell that senses red light as compared with a person with normal color vision. It is intended for people with color vision deficiency who are suffering from color vision deficiency, and has a transmittance curve with valleys to suppress the transmittance of green light.

That is, the three pyramidal cells L, M, and S of a person with normal color vision have sensitivity curves L, M, and S (see Non-Patent Document 1) as shown in FIG. In a person with red-green color vision, M pyramidal cells that sense green light and S pyramidal cells that sense blue light have the same sensitivity curves M and S as those with normal color vision, while the sensitivity of L pyramidal cells that sense red light. The curve is assumed to have low sensitivity, as in the sensitivity curve L3 shown by the two-point chain line.

Then, the sensitivity curve M for perceiving green light of a person with red-green dysfunction is relatively higher than the sensitivity curve L3 for perceiving red light. Therefore, in the color vision correction lens of Patent Document 1, in order to suppress the sensitivity of a person with red-green vision abnormality to green light, a transmittance curve in which the transmittance of green light having a wavelength near 534 nm is suppressed is provided.

In addition, another cause of color vision deficiency is considered to be that the wavelength of light that exhibits the peak sensitivity of pyramidal cells is different from that of a person with normal color vision, and the present inventor has a different wavelength from the conventional one in order to cope with this. A patent application (Japanese Patent Application No. 2018-11977, unpublished) has been filed earlier for a color vision correction lens having a transmittance curve that suppresses the transmittance of the above.

For example, in the sensitivity curve M3 shown by the two-point chain line in FIG. 8, the peak sensitivity M3p in the M pyramidal cell is on the long wavelength side of light as compared with the peak sensitivity Mp in the M pyramidal cell of a person with normal color vision. It is assumed that the sensitivity curve of a person with color vision abnormality is moving, but in the above-mentioned previous application, in order to correct such color vision, the minimum transmittance is in the region where the wavelength of light is 550 nm or more and less than 560 nm. We are proposing a color vision correction lens having a transmittance curve having a value.

Japanese Unexamined Patent Publication No. 2014-134661

"Visual system and color recognition-1" page of "Eye common sense / insane" homepage Searched on September 27, 2018 <http://y-ok.co green / eye / eye blue light / eye blue light -2.ht green>

However, the above-mentioned conventional color vision correction lens assumes only a color blind person in which one of the three types of pyramidal cells has a sensitivity curve different from that of a normal color vision person, and the sensitivity curves of the two types of pyramidal cells are There is a problem that people with color vision deficiency different from those with normal color vision are not assumed.
The present invention has been made to solve such a problem, and it is possible to correct the color vision of a person with color vision deficiency in which the sensitivity curves of two or more types of cone cells among the three types of cone cells are different from those of a person with normal color vision. An object of the present invention is to provide a color vision correction lens.

The invention made to solve the above problems is a color vision correction lens for correcting the color vision of a person with abnormal color vision, which has a width of 10 nm or more in a region where the wavelength of light is 560 nm or more and 600 nm or less and light in the entire region. It is provided with a first transmitting region having a transmittance of 70% or more, and two valley bottoms are provided in a region other than the first transmitting region in the visible light region having a light wavelength of 400 nm or more and 700 nm or less. It has a transmittance curve , and both of the two valley bottoms are provided in a region where the wavelength of light exceeds 600 nm .

In this way, by providing two valley bottoms in the transmittance curve, it is possible to correct the color vision of a color-blind person who has a sensitivity curve different from that of a person with normal color vision for two pyramidal cells. Here, in many cases of such color vision abnormalities, if the transmittance of light in the first transmission region in which the wavelength of light is 560 nm or more and 600 nm or less is suppressed, the color due to the light having the wavelength in the region becomes dark and it is difficult to distinguish the color. It is important that the transmittance of the first transmittance region is 70% or more over the entire area, and that the two valley bottoms in the transmittance curve are provided in regions other than the region.

The color vision correction lens according to the present invention is characterized in that the two valley bottoms are both provided in a region where the wavelength of light exceeds 600 nm .
By doing so, it is possible to correct the color vision of a color-blind person whose sensitivity curves of both the M-pyramidal cell and the L-pyramidal cell are largely shifted to the longer wavelength side than those of the normal color-vision person. ..

The color vision correction lens according to the present invention preferably includes a high transmittance region in which the light transmittance is 90% or more in the first transmittance region. By doing so, it is possible to more appropriately prevent the color having the wavelength in the high transmittance region from becoming dark.

The color vision correction lens of the present invention preferably has a light transmittance of less than 80% in the entire blue region having a wavelength of 400 nm or more and 490 nm or less. Many people with color vision deficiency have a further decline in color discrimination because the blue color is dazzling and cannot be seen. By suppressing the transmittance of blue light in this way, it is possible to suppress a decrease in the ability to discriminate colors when blue is present in the field of view.

The light transmittance at the bottoms of the two valleys is preferably 30% or more and 70% or less.
By setting the light transmittance at the valley bottom to 30% or more, it is possible to prevent the color corresponding to the wavelength of the valley bottom from becoming dark and indistinguishable. Further, by setting the light transmittance at the bottom of the valley to 70% or less, it is possible to sufficiently correct the color vision of a person with color vision deficiency.
Here, the "color vision correction lens" includes a lens that does not have a function of correcting abnormalities other than color vision deficiency, such as refractive error of myopia and hyperopia.

As described above, according to the color vision correction lens of the present invention, it is possible to perform color vision correction for a person with color vision deficiency who could not correct the color vision with the conventional color vision correction lens.

It is a transmittance curve of the color vision correction lens which concerns on reference embodiment 1 of this invention. It is a schematic graph which showed the light sensitivity curve of a person with color vision deficiency assumed as the object of the color vision correction lens which concerns on Reference Embodiment 1 of this invention by comparing with the light sensitivity curve of a person with normal color vision. It is a transmittance curve of the color vision correction lens which concerns on 1st Embodiment of this invention. It is a schematic graph which showed the light sensitivity curve of a person with color vision deficiency assumed as the object of the color vision correction lens which concerns on 1st Embodiment of this invention by comparing with the light sensitivity curve of the person with normal color vision. It is a transmittance curve of the color vision correction lens which concerns on reference embodiment 2 of this invention. It is a schematic graph which showed the light sensitivity curve of a person with color vision deficiency assumed as the object of the color vision correction lens which concerns on Reference Embodiment 2 of this invention by comparing with the light sensitivity curve of a person with normal color vision. It is a schematic graph which showed the light sensitivity curve of a person with color vision deficiency assumed as the object of the conventional color vision correction lens in comparison with the light sensitivity curve of a person with normal color vision. It is a schematic graph which showed the light sensitivity curve of a person with color vision deficiency assumed as the object of the color vision correction lens which concerns on the prior application of the present inventor in comparison with the light sensitivity curve of a person with normal color vision.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. However, the present invention is not limited to the following embodiments. The specific sensitivity in the figure indicates a ratio to the sensitivity of the peak of M pyramidal cells in a person with normal color vision.

The color vision correction lens of the present invention is provided with a transmittance curve in which the transmittance changes for each wavelength of light by providing a multilayer film on the surface of the lens substrate.
The lens substrate is formed from a material such as plastic or glass by polishing or pressing, and examples of the material for the plastic lens include methacrylic resin such as polymethylmethacrylate, polycarbonate, and polydiallyl glycol carbonates such as polydiethylene glycol bisallyl carbonate. , Polystyrene and the like can be used.
As a method for forming the multilayer film, a method of laminating a multilayer film, a vacuum vapor deposition method, an ion plating method, a sputtering method, or the like can be used.
However, the transmittance curve may be provided by a method other than providing the multilayer film, such as kneading a pigment into the lens substrate.

( Reference form 1 )
FIG. 1 shows the transmittance curves 11, 12, of the three types of color vision correction lenses according to the reference embodiment 1 of the present invention.
13 is schematically shown. The transmittance curves 11, 12, and 13 include a first transmittance region A1 having a width of 10 nm or more and a light transmittance of 70% or more in the entire region in a region where the wavelength of light is 560 nm or more and 600 nm or less. , Two valley bottoms (1) in the visible light region having a light wavelength of 400 nm or more and 700 nm or less, except for the first transmittance region A1.
1a, 11b), (12a, 12b), (13a, 13b) are provided.

In the transmittance curves 11, 12, 13, one valley bottom 11a, 12a, 13a is provided in a region where the wavelength of light is 400 nm or more and less than 560 nm, and the other valley bottom 11b, 12b, 13
b is provided in a region where the wavelength of light exceeds 600 nm and is 700 nm or less. In the color vision correction lens according to the reference form 1 , as shown in FIG. 2, the sensitivity curve M1 (two-point chain line) of the M pyramidal cell is on the shorter wavelength side than the sensitivity curve M of the normal person's M pyramidal cell. It is located and the sensitivity curve L1 (single point chain line) of the L pyramidal cell is located on the longer wavelength side than the sensitivity curve L of the L pyramidal cell of the normal person, so that the color vision is different from that of the normal person. Targeting a person with color vision abnormality X, one valley bottom 11a, 12a, 13a (see FIG. 1) is provided near the peak M1p of the sensitivity curve M1 of the M pyramidal cell, and the peak L1p of the sensitivity curve L1 of the L pyramidal cell is provided. The other valley bottom 11b, 12 in the vicinity of
By providing b and 13b (see FIG. 1), the sensitivity curve of the person with color vision deficiency X is brought closer to the sensitivity curve of the person with normal color vision.

As shown in FIG. 1, one valley bottom 11a, 12a, 13a and the other valley bottom 11b, 12b, 13b are all provided with a transmittance of 30% or more and 70% or less. If the transmittance of the valley bottom is less than 30%, the light having a wavelength at the valley bottom may become too dark and it may be difficult to distinguish the color. Further, if the transmittance of the valley bottom exceeds 70%, the light sensitivity curve of a person with color vision deficiency cannot be sufficiently deformed, and there is a possibility that sufficient color vision correction cannot be performed.

Further, as shown in FIG. 2, the color-blind person X assumed in this reference embodiment has an L-cone on the short wavelength side of the sensitivity curve M1 of the M-cone cell as compared with the sensitivity curve of the normal-color-vision person. It is considered that the light sensitivity of both the M and L cone cells between the peaks M1p and L1p of the sensitivity curve is lowered because the sensitivity curve of the cell is located on the long wavelength side. Therefore, in this reference embodiment, the wavelength is 5.
By providing the first transmission region A1 having a sensitivity of at least 10 nm or more in the wavelength region and transmitting 70% or more of light in the entire region in the region of 60 nm or more and 600 nm, it is possible to prevent the color of the wavelength in the region from becoming dark. doing. As shown in FIG. 2, the first transmission region A1 preferably includes a region A2 having a transmittance of 90% or more, and by doing so, the color of the wavelength in the first transmission region A1 becomes dark. Can be suppressed more effectively.

As shown in FIG. 1, the transmittance curves 11, 12, and 13 preferably have a light transmittance of less than 80% in the entire blue region having a wavelength of 400 nm or more and 490 nm or less. People with color vision deficiency may not be able to see directly in the vicinity of objects that emit blue light because the blue light is dazzling. As described above, by setting the light transmittance to less than 80% in the entire blue region, it is possible to directly look at the vicinity of the object that emits blue light.

(First Embodiment)
FIG. 3 shows the transmittance curves 21 and 22 of the three types of color vision correction lenses according to the first embodiment of the present invention.
23 is schematically shown.
The transmittance curves 21, 22, and 23 indicate that the wavelength of light is in the region of 560 nm or more and 600 nm or less.
A first transmission region A1 in a visible light region having a width of 10 nm or more and a light transmittance of 70% or more in the entire region and having a light wavelength of 400 nm or more and 700 nm or less. Two valley bottoms (21a, 21b), (22a) in the other regions excluded
, 22b), (23a, 23b) are provided.

Specifically, in the transmittance curves 21, 22, 23, the two valley bottoms (21a, 21b),
In both (22a, 22b) and (23a, 23b), the wavelength of light exceeds 600 nm and 700 n.
It is provided in an area of m or less. As shown in FIG. 4, the color vision correction lens according to the first embodiment has a normal sensitivity curve M2 (two-point chain line) for M cone cells and a normal sensitivity curve L2 (single point chain line) for L cone cells. The target is a color-blind person Y who has a color vision different from that of a person with normal color vision because it is located on the longer wavelength side than the sensitivity curve M of M pyramidal cells and the sensitivity curve L of L pyramidal cells. .. The transmittance curves 21, 22, and 23 are the peaks M of the sensitivity curve M2 of the M pyramidal cells.
By providing one valley bottom 21a, 22a, 23a in the vicinity of 2p and providing the other valley bottom 21b, 22b, 23b in the vicinity of the peak L2p of the sensitivity curve L2 of the L pyramidal cell, the sensitivity curve of the color blind person Y is colored. I try to get closer to the sensitivity curve of normal people.

As shown in FIG. 3, the one valley bottoms 21a, 22a, 23a and the other valley bottoms 21b, 22b, 23b are all provided with a transmittance of 30% or more and 70% or less. If the transmittance of the valley bottom is less than 30%, the light having a wavelength at the valley bottom may become too dark and it may be difficult to distinguish the color. Further, if the transmittance of the valley bottom exceeds 70%, the light sensitivity curve of a person with color vision deficiency cannot be sufficiently deformed, and there is a possibility that sufficient color vision correction cannot be performed.

Further, as shown in FIG. 4, the color-blind person Y assumed in the present embodiment has a longer sensitivity curve of M pyramidal cells M1 and L pyramidal cells than the sensitivity curve of a person with normal color vision. It is considered that the sensitivity of light in the region of 560 nm or more and 600 nm is lowered by being located on the wavelength side. Therefore, also in the present embodiment, by providing a first transmission region A1 having a width of at least 10 nm or more and transmitting light by 70% or more in the entire region in a region having a wavelength of 560 nm or more and 600 nm, the wavelength in the region can be determined. It suppresses the darkening of the light. As shown in FIG. 4, the first transmission region A1 preferably includes a region A2 having a transmittance of 90% or more, and by doing so, the light having a wavelength in the first transmission region A1 becomes dark. Can be suppressed more effectively.

Also in the color vision correction lens according to the first embodiment, as shown in FIG. 3, the transmittance curve 21
In 22 and 23, the light transmittance is preferably less than 80% in the entire blue region including the region where the wavelength of light is 400 nm or more and 490 nm or less.

( Reference form 2 )
FIG. 5 schematically shows the transmittance curves 31, 32, and 33 of the three types of color vision correction lenses according to the reference embodiment 2 of the present invention.
The transmittance curves 31, 32, 33 show that the wavelength of light is in the region of 560 nm or more and 600 nm or less.
A first transmission region A1 in a visible light region having a width of 10 nm or more and a light transmittance of 70% or more in the entire region and having a light wavelength of 400 nm or more and 700 nm or less. Two valley bottoms (31a, 31b), (32a) in the other regions excluded
, 32b), (33a, 33b) are provided.

Specifically, as shown in FIG. 5, in the transmittance curves 31, 32, 33, two valley bottoms (
31a, 31b), (32a, 32b), (33a, 33b) all have a wavelength of light of 400.
It is provided in a region of nm or more and less than 560 nm. As shown in FIG. 6, in the color vision correction lens of Reference Form 2 , the peak S1p of the sensitivity curve S1 (single point chain line) of the S pyramidal cell is higher than the peak Sp of the sensitivity curve S of the S pyramidal cell of a person with normal color vision. Therefore, blue light is felt more dazzling than those with normal color vision, and the peak L3p of the sensitivity curve L3 (two-point chain line) of L pyramidal cells is lower than the peak Lp of the sensitivity curve L of L pyramidal cells of normal color vision cells. , The color vision deficiency Z, who has a different color vision from the normal color vision because the red light felt by the L cone cells is relatively lower than the green light felt by the M cone cells, is targeted. One valley bottom 31 near the peak S1p of the curve S1
While a, 32a, 33a (see FIG. 5) are provided to suppress the transmittance of blue light to suppress the feeling of dazzling blue light, the other valley bottom is near the peak M3p of the sensitivity curve M3 of M pyramidal cells. By providing 31b, 32b, 33b (see FIG. 5), M pyramidal cells and L of color blind person Z
The ratio of light sensitivity of pyramidal cells is made close to that of people with normal color vision.

As shown in FIG. 5, the one valley bottoms 31a, 32a, 33a and the other valley bottoms 31b, 32b, 33b are all provided with a transmittance of 30% or more and 70% or less. If the transmittance of the valley bottom is less than 30%, the light having a wavelength at the valley bottom may become too dark and it may be difficult to distinguish the color. Further, if the transmittance of the valley bottom exceeds 70%, the light sensitivity curve of a person with color vision deficiency cannot be sufficiently deformed, and there is a possibility that sufficient color vision correction cannot be performed.

Further, as shown in FIG. 6, the color-blind person Z assumed in this reference embodiment has a wavelength of 560 nm because the peak L3p of the sensitivity curve L3 of the L pyramidal cell is lower than the sensitivity curve of the person with normal color vision.
It is considered that the sensitivity of light in the region of 600 nm or more is lower than that of a person with normal color vision.
Therefore, also in this reference embodiment, by providing a first transmission region A1 having a width of at least 10 nm or more and transmitting light by 70% or more in the entire region in a region having a wavelength of 560 nm or more and 600 nm, the wavelength in the region can be determined. It suppresses the darkening of the light. As shown in FIG. 4, the first transmission region A1 preferably includes a region A2 having a transmittance of 90% or more, and by doing so, the light having a wavelength in the first transmission region A1 becomes dark. Can be suppressed more effectively.

Further, it is considered that the color vision deficient person Z assumed in this reference embodiment has lower light sensitivity than the color vision deficient person even in the region where the wavelength is 470 nm or more and less than 490 nm. Therefore,
In this reference embodiment, as shown in FIG. 5, a second transmission region ratio B2 that transmits light by 70% or more in the entire region with a width of at least 10 nm or more is provided in a region having a wavelength of 470 nm or more and 490 nm. It suppresses the darkening of blue.

In the color vision correction lens according to the reference form 2 , the transmittance curves 31, 32, and 33 are shown in FIG.
As shown in the above, it is preferable that the light transmittance is less than 80% in the entire blue region including the region where the wavelength of light is 400 nm or more and 490 nm or less.

As described above, the color vision deficiency experience lens of the present invention is not limited to the above-described embodiment, and for example, the transmittance at the valley bottom may exceed 70% or less than 30%. The light transmittance may exceed 80% in a part or all of the blue region. The transmittance may be less than 90% in the entire area of the first transmission region.

Transmittance curves 11, 12, 13, 21, 22, 23, 31, 32, 33
First transmission region A1
Second transmission region B1
High transmittance region A2
Valley bottoms 11a, 12a, 13a, 11b, 12b, 13b, 21a, 22a, 23a, 21b, 22b, 23b, 31a, 32a, 33a, 31b, 32b, 33b

Claims (4)

A color vision correction lens that corrects the color vision of people with color vision deficiency.
A first transmission region having a width of 10 nm or more and a light transmittance of 70% or more in the entire region is provided in a region where the wavelength of light is 560 nm or more and 600 nm or less.
It has a transmittance curve in which two valley bottoms are provided in a region other than the first transmission region in the visible light region having a light wavelength of 400 nm or more and 700 nm or less .
A color vision correction lens characterized in that both of the two valley bottoms are provided in a region where the wavelength of light exceeds 600 nm . The color vision correction lens according to claim 1, further comprising a high transmittance region in which the light transmittance is 90% or more in the first transmittance region. Light transmission in the entire blue region where the wavelength of light is 400 nm or more and 490 nm or less
The color vision correction lens according to claim 1 or 2, wherein the rate is less than 80%. Claim 1 in which the light transmittances at the two valley bottoms are both 30% or more and 70% or less.
The color vision correction lens according to any one of claims 3.

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