JP2020052243A - Color vision correction lens - Google Patents

Abstract

To provide a color vision correction lens that can correct color vision of a color blind person who has a different sensitivity curve in two or more of three types of pyramidal cells from a person with normal color vision.SOLUTION: A color vision correction lens has a first transmission region having a 10 nm or more width and a 70% or more light transmittance in the entire region in a region whose light wavelength is 560 nm to 600 nm, and has a transmittance curve where two bottoms 11a and 11b are provided in a region other than the first transmission region in a visible ray region whose light wavelength is 400 nm to 700 nm.SELECTED DRAWING: Figure 2

Description

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

  According to the present inventors, any of the three types of pyramidal cells of L, M, and S, each of which senses red, green, and blue light, respectively, has a sensitivity different from that of a normal color vision person. Based on this idea, he has been engaged in the manufacture, sale, and development of color vision correction lenses.

  For example, in the color vision correction lens disclosed in Patent Document 1, the M cone cells that sense green light are relatively more sensitive than the L cone cells that sense red light, so that the red-green color deficiency is higher than that of a person with normal color vision. And has a transmittance curve in which valleys are provided in order to suppress the transmittance of green light.

  That is, the three pyramidal cells L, M, and S of a normal color vision person have sensitivity curves L, M, and S as shown in FIG. 7 (see Non-Patent Document 1). A person with red-green color deficiency has sensitivity curves of M cone cells that sense green light and S cone cells that sense blue light have the same sensitivity curves M and S as those with normal color vision, while sensitivity of L cone cells that sense red light. The curve is assumed to have low sensitivity, as in a sensitivity curve L3 indicated by a two-dot chain line.

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

  In addition, as a cause of the color vision abnormality, it is considered that the wavelength of light exhibiting a peak of sensitivity of pyramidal cells is different from that of a normal color vision person. A patent application (Japanese Patent Application No. 2018-119772, unpublished) has been filed for a color vision correction lens having a transmittance curve that suppresses the transmittance of the lens.

  For example, the sensitivity curve M3 shown by a two-dot chain line in FIG. 8 shows that the sensitivity peak M3p in M cone cells is longer on the long wavelength side of light than the sensitivity peak Mp of M cone cells in a normal color vision person. Although it is assumed that the sensitivity curve of a color-blind person who is moving, in the above-mentioned earlier application, in order to correct such color vision, the transmittance of light in a region where the wavelength of light is 550 nm or more and less than 560 nm is minimized. A color vision correction lens with a transmittance curve having a value has been proposed.

JP 2014-134661 A

"Visual system and color recognition-1" page of "Eye Commons / Insane" homepage Search 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 vision impaired person in which one of the three types of cone cells has a sensitivity curve different from that of a normal color vision person, and the sensitivity curves of the two types of cone cells are different. There is a problem that a color-blind person different from a color-blind person is not assumed.
The present invention has been made in order to solve such a problem, and the sensitivity curve of two or more pyramidal cells among the three types of pyramidal cells can correct the color vision of a color-blind person having a different color vision from a person with normal color vision. It is intended to provide a color vision correction lens.

  The invention made to solve the above-mentioned problem is a color vision correction lens for correcting color vision of a person with color vision deficiency, and 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 a light beam in the entire region. A first transmission region having a transmittance of 70% or more, and two valleys are provided in a region other than the first transmission region in a visible light region having a light wavelength of 400 nm to 700 nm. Characterized by having a transmittance curve.

  Thus, by providing two valleys in the transmittance curve, it is possible to correct the color vision of a color-deficient person having a sensitivity curve different from that of a normal color-vision person for two cone cells. Here, most of the color-blind people have difficulty in determining the color by reducing the light transmittance of the first transmission region having a wavelength of 560 nm or more and 600 nm or less due to the light of the wavelength in the region. Therefore, it is important that the transmittance of the first transmission region be 70% or more over the entire region, and that two valleys in the transmittance curve are provided in a region other than the region.

In the color vision correction lens according to the present invention, one of the two valleys is provided in a region where the wavelength of light is less than 560 nm, and the other valley is provided in a region where the wavelength of light exceeds 600 nm. including.
By doing so, the color curve is abnormal such that the sensitivity curve of the M cone cells is on the shorter wavelength side than that of a normal color vision person, and the sensitivity curve of the L cone cells is on the longer wavelength side than that of a normal color vision person. Color vision can be corrected.

The color vision correction lens according to the present invention includes those in which the two valleys are 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 in which the sensitivity curves of both the M-pyramidal cell and the L-pyramidal cell move significantly to the longer wavelength side as compared with those of a color-blind person. .

The color vision correction lens according to the present invention includes those in which the two valleys are provided in a region where the wavelength of light is less than 560 nm.
By doing so, it is possible to correct the color vision of a person with abnormal color vision whose sensitivity of S cone cells is higher than that of a normal color vision person and whose sensitivity of L cone cells is lower than that of a normal color vision person.

In the color vision correction lens according to the present invention, one of the two valleys is provided in a region where the wavelength of light is less than 470 nm, and the other valley is provided in a region where the wavelength of light exceeds 490 nm. Including those having a second transmission region having a width of 10 nm or more in a region having a wavelength of 470 nm or more and 490 nm or less and having a light transmittance of 70% or more in the entire region.
When two valleys of the transmittance curve are provided in such a region, by providing the second transmission region in a region of 470 nm to 490 nm, it is possible to prevent a color having a wavelength of the transmission region from being darkened. .

  It is preferable that the color vision correction lens according to the present invention include a high transmittance region having a light transmittance of 90% or more in the first transmission region. This makes it 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 where the light wavelength is 400 nm or more and 490 nm or less. There are many people with color vision deficiencies who have difficulty in seeing because the blue color is so dazzling that the color discrimination ability is further reduced. As described above, by suppressing the transmittance of blue light, it is possible to suppress a decrease in color discrimination ability when blue exists in the field of view.

The light transmittance at the two valley bottoms is preferably 30% or more and 70% or less.
By setting the transmittance of light at the bottom of the valley to 30% or more, it is possible to prevent the color corresponding to the wavelength at the bottom of the valley from becoming dark and indistinguishable. Further, by setting the transmittance of light at the bottom of the valley to 70% or less, the color vision of a person with abnormal color vision can be sufficiently corrected.
Here, the “color vision correction lens” includes a lens having no function of correcting abnormalities other than color vision abnormality 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 color vision impaired person whose color vision cannot be corrected by the conventional color vision correction lens.

4 is a transmittance curve of the color vision correction lens according to the first embodiment of the present invention. FIG. 4 is a schematic graph showing a light sensitivity curve of a color-deficient person assumed as an object of the color-vision correcting lens according to the first embodiment of the present invention, in comparison with a light sensitivity curve of a normal color-vision person. It is a transmittance curve of the color vision correction lens according to the second embodiment of the present invention. It is a schematic graph which showed the light sensitivity curve of the color vision impaired person assumed as a target of the color vision correction lens concerning 2nd Embodiment of this invention compared with the light sensitivity curve of a color vision normal person. It is a transmittance curve of the color vision correction lens according to the third embodiment of the present invention. It is a schematic graph which showed the light sensitivity curve of the color vision impaired person assumed as a target of the color vision correction lens which concerns on 3rd Embodiment of this invention in comparison with the light sensitivity curve of a color vision normal person. FIG. 9 is a schematic graph showing a light sensitivity curve of a person with abnormal color vision assumed as a target of a conventional color vision correction lens in comparison with a light sensitivity curve of a person with normal color vision. 5 is a schematic graph showing a light sensitivity curve of a color-deficient person assumed as a target of the color vision correcting lens according to the earlier application of the present inventor, in comparison with a light sensitivity curve of a normal color-vision person.

  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. Note that the specific sensitivity in the figure indicates a ratio to the sensitivity of the peak of M cone cells of 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. Examples of the material of the plastic lens include methacrylic resins such as polymethyl methacrylate, polycarbonate, and polydiallyl glycol carbonates such as polydiethylene glycol bisallyl carbonate. , Polystyrene and the like can be used.
As a method of forming the multilayer film, a method of attaching and forming a multilayer film, a vacuum evaporation 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.

(1st Embodiment)
FIG. 1 schematically shows transmittance curves 11, 12, and 13 of three types of color vision correction lenses according to the first embodiment of the present invention. The transmittance curves 11, 12, and 13 include a first transmission 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 valleys (11a, 11b), (12a, 12b), and (13a, 13b) are provided in a region other than the first transmission region A1 in a visible light region having a light wavelength of 400 nm or more and 700 nm or less. Have been.

  In the transmittance curves 11, 12, and 13, one of the valleys 11a, 12a, and 13a is provided in a region where the wavelength of light is 400 nm or more and less than 560 nm, and the other valleys 11b, 12b, and 13b have a wavelength of 600 nm. Over the region of 700 nm or less. As shown in FIG. 2, the color vision correction lens according to the first embodiment has a sensitivity curve M1 (dotted double-dashed line) of M cone cells on a shorter wavelength side than a sensitivity curve M of M cone cells of a normal person. , And the sensitivity curve L1 (dot-dash line) of the L-cone cells is located on the longer wavelength side compared to the sensitivity curve L of L-cone cells of a normal person, so that color vision different from that of a normal color vision person is exhibited. One of the valleys 11a, 12a, and 13a (see FIG. 1) is provided near the peak M1p of the sensitivity curve M1 of M cone cells, and the peak of the sensitivity curve L1 of L cone cells is targeted. By providing the other valley bottoms 11b, 12b, and 13b (see FIG. 1) near L1p, the sensitivity curve of the color-blind person X is made closer to the sensitivity curve of the color-blind person.

  As shown in FIG. 1, one of the valley bottoms 11a, 12a, and 13a and the other valley bottoms 11b, 12b, and 13b are each provided with a transmittance of 30% or more and 70% or less. If the transmittance at the bottom of the valley is less than 30%, the light having the wavelength at the bottom of the valley may be too dark to make it difficult to determine the color. If the transmittance at the bottom of the valley exceeds 70%, the light sensitivity curve of the color-blind person 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 vision impaired person X assumed in the present embodiment has a sensitivity curve M1 of M cone cells on the short wavelength side and an L cone as compared with the sensitivity curve of a person with normal color vision. It is considered that when the sensitivity curve of the cell is located on the long wavelength side, the light sensitivity of the M cone cells and the light of the L cone cells between the peaks M1p and L1p of the sensitivity curve are both reduced. Therefore, in the present embodiment, the first transmission region A1 having a sensitivity of at least 10 nm or more in the wavelength range and transmitting 70% or more of light in the entire region is provided in a region having a wavelength of 560 nm or more and 600 nm. It prevents the color of the wavelength from becoming dark. As shown in FIG. 2, the first transmission area A1 preferably includes an area A2 having a transmittance of 90% or more, whereby the color of the wavelength in the first transmission area 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 light wavelength of 400 nm or more and 490 nm or less. A person with color vision deficiency may be unable to look directly at the vicinity of an object that emits the 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 becomes possible to directly look at the vicinity of an object that emits blue light.

(2nd Embodiment)
FIG. 3 schematically shows transmittance curves 21, 22, and 23 of three types of color vision correction lenses according to the second embodiment of the present invention.
The transmittance curves 21, 22, and 23 include a first transmission 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 light wavelength is 560 nm or more and 600 nm or less. Two valleys (21a, 21b), (22a, 22b), and (23a, 23b) are provided in a region other than the first transmission region A1 in a visible light region having a light wavelength of 400 nm or more and 700 nm or less. Have been.

  Specifically, in the transmittance curves 21, 22, 23, the two valley bottoms (21a, 21b), (22a, 22b), and (23a, 23b) are all in the region where the wavelength of light exceeds 600 nm and is 700 nm or less. Is provided. As shown in FIG. 4, the color vision correction lens according to the second embodiment has a sensitivity curve M2 (dashed-dotted line) of M cone cells and a sensitivity curve L2 (dashed-dotted line) of L cone cells each of a normal person. The target is a color-blind person Y who has a color vision different from that of a normal color vision person by being located on the longer wavelength side as compared with the sensitivity curve M of the M cone cells and the sensitivity curve L of the L cone cells. . The transmittance curves 21, 22, 23 have one valley bottom 21a, 22a, 23a near the peak M2p of the sensitivity curve M2 of M cone cells, and the other near the peak L2p of the sensitivity curve L2 of L cone cells. By providing the valleys 21b, 22b, and 23b, the sensitivity curve of the color-blind person Y is made to approach the sensitivity curve of the color-blind person.

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

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

  Also in the color vision correction lens according to the second embodiment, as shown in FIG. 3, the transmittance curves 21, 22, and 23 indicate that the light transmission is performed in the entire blue region including the region where the wavelength of light is 400 nm or more and 490 nm or less. Preferably, the rate is less than 80%.

(Third embodiment)
FIG. 5 schematically shows transmittance curves 31, 32, and 33 of three types of color vision correction lenses according to the third embodiment of the present invention.
The transmittance curves 31, 32, and 33 include a first transmission 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 light wavelength is 560 nm or more and 600 nm or less. Two valleys (31a, 31b), (32a, 32b), and (33a, 33b) are provided in a region other than the first transmission region A1 in a visible light region having a light wavelength of 400 nm or more and 700 nm or less. Have been.

  Specifically, as shown in FIG. 5, in the transmittance curves 31, 32, and 33, the two valleys (31a, 31b), (32a, 32b), and (33a, 33b) all have a light wavelength of 400 nm. It is provided in the region of less than 560 nm. As shown in FIG. 6, in the color vision correction lens of the third embodiment, the peak S1p of the sensitivity curve S1 (dashed line) of the S cone cells is smaller than the peak Sp of the sensitivity curve S of the S cone cells of a normal color vision person. Because of the high brightness, blue light is perceived as more dazzling than a person with normal color vision, and the peak L3p of the sensitivity curve L3 of the L cone cells (two-dot chain line) is lower than the peak Lp of the sensitivity curve L of L cone cells of normal color vision persons. Low, the red light sensed by the L-cone cells is relatively lower than the green light sensed by the M-cone cells, so that the color-blind person Z presenting a color vision different from that of a normal color vision person is targeted, One of the valleys 31a, 32a, and 33a (see FIG. 5) is provided near the peak S1p of the sensitivity curve S1 to suppress the blue light transmittance, thereby suppressing the dazzling of blue light, and the sensitivity of M cone cells. Near the peak M3p of the curve M3 By providing square valley 31b, 32 b, 33b (see FIG. 5), and the ratio of the light sensitivity of the M pyramidal cells and the L cone cell color defectives Z to approach that of normal color vision person.

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

  In addition, as shown in FIG. 6, the color vision impaired person Z assumed in the present embodiment has a wavelength of 560 nm because the peak L3p of the sensitivity curve L3 of L-pyramidal cells is lower than the sensitivity curve of a person with normal color vision. It is considered that the sensitivity of light in the above 600 nm region is lower than that of a person with normal color vision. Therefore, also in the present embodiment, a first transmission region A1 having a width of at least 10 nm and transmitting 70% or more of light in the entire region is provided in a region having a wavelength of 560 nm to 600 nm, so that the wavelength of the region is reduced. It suppresses darkening of light. As shown in FIG. 4, the first transmission region A1 preferably includes a region A2 having a transmittance of 90% or more, whereby the light of the wavelength in the first transmission region A1 becomes dark. Can be suppressed more effectively.

  Further, it is considered that the color vision impaired person Z assumed in the present embodiment has lower light sensitivity than the normal color vision person even in a region where the wavelength is 470 nm or more and less than 490 nm. Therefore, in the present embodiment, as shown in FIG. 5, a second transmission area ratio B2 that has a wavelength of 470 nm or more and 490 nm and has a width of at least 10 nm or more and transmits 70% or more of light in the entire area is provided. To suppress the darkening of the blue color.

  Also in the color vision correction lens according to the third embodiment, as shown in FIG. 5, the transmittance curves 31, 32, and 33 indicate light transmission over the entire blue region including a region where the wavelength of light is 400 nm or more and 490 nm or less. Preferably, the rate is less than 80%.

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

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

Claims (8)

A color vision correction lens that corrects the color vision of a color blind person,
A first transmission region 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;
A color vision correction lens comprising a transmittance curve in which two valleys are provided in a region other than the first transmission region in a visible light region having a light wavelength of 400 nm or more and 700 nm or less.   2. The color vision correction lens according to claim 1, wherein one of the two valleys is provided in a region where the wavelength of light is less than 560 nm, and the other valley is provided in a region where the wavelength of light exceeds 600 nm. 3.   2. The color vision correction lens according to claim 1, wherein each of the two valleys is provided in a region where the wavelength of light exceeds 600 nm. 3.   2. The color vision correction lens according to claim 1, wherein each of the two valleys is provided in a region where the wavelength of light is less than 560 nm.   Of the two valley bottoms, one valley bottom is provided in a region where the wavelength of light is less than 470 nm, and the other valley bottom is provided in a region where the wavelength of light exceeds 490 nm, and in a region where the wavelength of light is 470 nm or more and 490 nm or less. The color vision correction lens according to claim 4, further comprising a second transmission region having a width of 10 nm or more and having a light transmittance of 70% or more in all regions.   The color vision correction lens according to any one of claims 1 to 5, further comprising a high transmittance area having a light transmittance of 90% or more in the first transmission area.   The color vision correction lens according to any one of claims 1 to 6, wherein the light transmittance is less than 80% in the entire blue region having a wavelength of 400 nm or more and 490 nm or less.   The color vision correction lens according to any one of claims 1 to 7, wherein light transmittance at the two valley bottoms is 30% or more and 70% or less.

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