JP2020000287A - Color vision correction lens - Google Patents

Abstract

To provide a color vision correction lens capable of correcting a color vision of a person with an abnormal color vision whose color vision could not be sufficiently corrected so far.SOLUTION: Transmittance curves 11, 12, and 13 of a light related to a color vision correction lens have minimum values 11a, 12a, and 13a of the transmittance in a region where a wavelength of the light is 550 nm or more and less than 560 nm.SELECTED DRAWING: Figure 1

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.

  2. Description of the Related Art Conventionally, a color vision correction lens (for example, Patent Literature 1) that allows a color vision impaired person to distinguish a color that cannot be distinguished by providing a transmittance curve according to the color vision characteristics of the color vision impaired person is commercially available.

  A person with normal color vision has three types of cone cells of L, M, and S that sense red, green, and blue light, respectively. Based on the theory that M cone cells to be sensed are generated because the sensitivity is relatively stronger than L cone cells to sense red light, it has a transmittance curve with valleys to suppress the transmittance of green light. is there.

  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. 8 (see Non-Patent Document 1). A person with red-green color deficiency has the same sensitivity curves M and S as the M cone cells sensing green light and the S cone cells sensing blue light, while the sensitivity of L cone cells sensing red light. The curve is assumed to have low sensitivity, like a sensitivity curve L1 indicated by a two-dot chain line.

  Then, the sensitivity curve M of the person with red-green color deficiency that senses green light is relatively higher than the sensitivity curve L1 that senses red light. Therefore, in the color vision correction lens of Patent Document 1, a transmittance curve is provided in which the transmittance of green light having a wavelength near 534 nm is suppressed in order to suppress the sensitivity of a person with red-green vision impairment to green light.

Japanese Patent Application Laid-Open No. 2014-134661

"Visual system and color recognition-1" page of "Eye common sense / insane" homepage Search on May 28, 2018 <http://y-ok.co green / eye / eye blue light / eye blue light -2.ht green>

  However, even if any type of color vision correction lens of Patent Document 1 is worn, there is still a considerable proportion of color vision impaired persons who cannot sufficiently correct color vision, and the optimal transmission for such color vision impaired persons is present. Finding the rate curve has long been a challenge.

And while the present inventor diligently studies, some of the red-green color deficits have abnormal color vision due to reasons other than the relatively high sensitivity of M cone cells. For example, the onset occurs because the wavelength of the light exhibiting the peak Mp of the sensitivity curve of the M cone cells and the wavelength of the light exhibiting the peak Lp of the sensitivity curve of the L cone cells are relatively close to each other. Leads to the idea that something is available. That is, like the sensitivity curve M1 shown by the two-dot chain line in FIG. 2, the peak M1p is close to the peak Lp of the sensitivity curve L relating to the L-cone cells, so that the sensitivity curve M1 for sensing green light and the sensitivity curve M1 for red light are sensed. Red and green are considered to be indistinguishable due to the overlap of the sensitivity curves L, and if so, such a color-blind person can suppress the transmittance of light having a wavelength around 534 nm. , M cone cells and L cone cells cannot have different sensitivity curves.
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a color vision correction lens that can perform color vision correction sufficiently for a color vision impaired person who could not perform appropriate color vision correction with a conventional color vision correction lens. I do.

  The invention made in order 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 transmittance curve having a minimum transmittance in a region where the wavelength of light is 550 nm or more and less than 560 nm. It is characterized by the following.

  As described above, by providing the minimum value of the transmittance in the transmittance curve in a region where the wavelength of light is 550 nm or more and less than 560 nm, the peak of the sensitivity curve of the M-pyramidal cell is shifted to a higher wavelength side compared to a normal color vision person. By moving, or by moving the peak of the sensitivity curve of the L-cone cells to the lower wavelength side, the M-pyramid cells and the color-blindness person whose sensitivity curves of the L-cone cells have been approximated, By lowering the peak of the moved cone cells, a difference can be provided between the sensitivity curves of the M cone cells and the L cone cells.

The present invention relates to a color vision correction lens for correcting color vision of a color vision impaired person, wherein the color vision correction lens comprises a transmittance curve having a minimum transmittance in a region where the wavelength of light is 560 nm or more and less than 570 nm. including.
In this manner, the peak of the transmittance of the sensitivity curve of the M cone cells is lower than that of the color-blind person, and the peak of the transmittance of the L cone cells is lowered. The relative relationship between the sensitivity curve of M cone cells and the sensitivity curve of L cone cells can be approximated to that of a normal color vision person.

The present invention relates to a color vision correction lens for correcting color vision of a color vision impaired person, comprising a transmittance curve having a minimum transmittance value in a region where the wavelength of light is 570 nm or more and less than 580 nm. including.
When the peak of M cone cells largely shifts to the higher wavelength side and the peak of the sensitivity curve of M cone cells is in this wavelength range, the red-green color vision abnormality is caused. As described above, by providing a transmittance curve having a minimum value of transmittance in a region where the wavelength of light is 570 nm or more and less than 580 nm in the color vision correction lens, the peak of the sensitivity curve of such M cone cells is lowered, A difference can be provided between the sensitivity curves of the M and L cone cells.

A color vision correction lens having a minimum transmittance in a region where the wavelength of the light is 550 nm or more and less than 560 nm, and a transmittance curve having a minimum transmittance in a region where the wavelength of the light is 570 nm or more and less than 580 nm. In the color vision correction lens, the minimum value of the transmittance is preferably 30% or less lower than the transmittance of yellow light having a wavelength of 564 nm.
A color vision impaired person having a peak of the sensitivity curve of M cone cells in a region where the wavelength of light is 550 nm or more and less than 560 nm, or a color vision having a peak of a sensitivity curve of red primary cells in a region where the wavelength of light is 570 nm or more and less than 580 nm. In the case of an abnormal person, by wearing such a color vision correction lens, a great difference can be made between the sensitivity of the M cone cells and the sensitivity of the L cone cells.

In the color vision correction lens having a minimum transmittance in a region where the wavelength of the light is 550 nm or more and less than 560 nm, it is preferable that the minimum value of the transmittance is 30% or more lower than the transmittance of green light having a wavelength of 534 nm. .
In the case of a color-blind person having a peak in the sensitivity curve of L-cone cells in the wavelength range, by wearing such a color vision correction lens, the difference between the sensitivity of M-cone cells and L-cone cells is greatly increased. Can be turned on.
Here, the “color vision correction lens” includes a lens that does not have a function of correcting an abnormality other than color vision abnormality, such as a myopic or hyperopic refractive error.

The present invention is a color vision correction lens that corrects the color vision of a color vision impaired person, and includes a transmittance curve having a minimum transmittance in a region where the wavelength of light is 450 nm or more and less than 510 nm, or in a region where light wavelength is 580 nm or more and less than 630 nm. And a color vision correction lens.
In the case where the color vision deficiency is caused by the shift of the peak of the sensitivity curve of the pyramidal cells, the wavelength of the shifted peak may be in a region of 450 nm or more and less than 510 nm, or in a region of 580 nm or more and less than 630 nm. It is conceivable that even in such a case, color vision correction can be performed by using a color vision correction lens provided with a minimum value of the transmittance curve near the wavelength where the sensitivity curve becomes a peak.

  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 a conventional color vision abnormality correction lens.

3 is a transmittance curve of the color vision correction lens according to the first embodiment of the present invention. It is the model which showed the sensitivity curve of the cone cell of a color vision impaired person assumed as a target of the color vision correction lens which concerns on 1st Embodiment with the sensitivity curve of the cone cell of a color vision normal person. Assumed as the object of the color vision correction lens according to the first embodiment, the sensitivity curve of the cone cells of another color blind person different from the color blind person shown in FIG. It is a schematic graph shown in comparison. It is a transmittance curve of the color vision correction lens according to the second embodiment of the present invention. It is the model which showed the sensitivity curve of the cone cell of a color vision impaired person assumed as a target of the color vision correction lens which concerns on 2nd Embodiment with the sensitivity curve of the cone cell 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 sensitivity curve of the cone cell of a color vision impaired person assumed as the object of the color vision correction lens which concerns on 3rd Embodiment with the sensitivity curve of the cone cell of a color vision normal person. It is a schematic graph which showed the sensitivity curve of the cone cell of a color vision impaired person assumed as a target of the conventional color vision correction lens in comparison with the sensitivity curve of a cone cell of a person with normal color vision. 9 is a transmittance curve of a color vision correction lens according to another embodiment of the present invention.

  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 color vision correction lens of the present invention is provided with a transmittance curve in which the transmittance changes depending on the 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, it goes without saying that 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 have minimum transmittance values 11a, 12a, and 13a in a region where the wavelength of light is 550 nm or more and less than 560 nm. In the transmittance curves 11, 12, and 13, the transmittance for green light having a wavelength of 534 nm and the transmittance for yellow light having a wavelength of 564 nm are both set to be 30% or more higher than the minimum values 11a, 12a, and 13a. I have. In the example of FIG. 1, the minimum values 11a, 12a, and 13a of the transmittances of the transmittance curves 11, 12, and 13 are 40%, 35%, and 30%, respectively, and the wavelengths of the transmittance curves 11, 12, and 13 are different. The transmittances 11b, 12b, and 13b for green light of 534 nm are 80%, 75%, and 70%, and the transmittances 11c, 12c, and 13c for yellow light having a wavelength of 564 nm are 80%, 75%, and 70%, respectively. is there.

The color vision correction lens according to the first embodiment has a sensitivity curve M1 of M cone cells shown by a two-dot chain line in FIG. 2 and sensitivity curves L and S of L and S cone cells same as those with normal color vision. The intended color blindness person A is targeted. The color-blind person A has the sensitivity curve M1 of the M cone cells located on the higher wavelength side than the sensitivity curve M of the M cone cells of the person with normal color vision and is close to the sensitivity curve L of the L cone cells. , Who assumed that the red-green color perception was abnormal. Assuming that the wavelength of the peak M1p of the sensitivity curve M1 of the color vision deficient person A is located in the region of 550 nm or more and less than 560 nm, even if the transmittance of light having a wavelength around 534 nm is suppressed as in a conventional color vision correction lens. , There can be little difference between the sensitivity curves M1 and L. Therefore, in the color vision correction lens according to the first embodiment, a transmittance curve having a minimum value of transmittance is provided in a region where the wavelength of light is 550 nm or more and less than 560 nm, and the sensitivity of the wavelength near the peak M1p of the sensitivity curve M1 is reduced. In this way, the sensitivity curve M1 and the sensitivity curve L are provided with a difference so that the color-blind person A can distinguish between red and green light.
Note that the specific sensitivity in FIG. 2 and the like indicates the ratio of the sensitivity of each cone cell to the sensitivity of the peak Mp of the sensitivity curve of the M cone cells of a normal color vision person.

  In addition, the color vision correction lens according to the first embodiment has a sensitivity curve L2 of L cone cells shown by a two-dot chain line in FIG. 3 and sensitivity curves M and S of M and S cone cells which are the same as those with normal color vision. Is also targeted for the color-blind person B who is assumed to have In the color-blind person B, the sensitivity curve L2 of L-pyramidal cells is located on a lower wavelength side than the sensitivity curve L of L-pyramidal cells of a person with normal color vision, and is close to the sensitivity curve M of M-pyramidal cells. It is assumed that the red-green color sense is abnormal. The wavelength of the peak Lp of the sensitivity curve L2 of the color-blind person B is located in a region of 550 nm or more and less than 560 nm, and a transmittance curve having a minimum value of transmittance is provided in a region where the wavelength of light is 550 nm or more and less than 560 nm. By lowering the peak of the sensitivity curve L2 by the color vision correction lens according to the first embodiment, it is possible to provide a difference between the sensitivity curve M and the sensitivity curve L2 so that the color-blind person B can distinguish between red and green light. it can.

(2nd Embodiment)
FIG. 4 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 have minimum transmittance values 21a, 22a, and 23a in a region where the wavelength of light is 560 nm or more and less than 570 nm. Further, in the transmittance curves 21, 22, 23, the transmittances 21b, 22b, 23b for green light having a wavelength of 534 nm are provided at least 30% higher than the minimum values 21a, 22a, 23a. In the example of FIG. 4, the minimum values 21a, 22a, and 23a of the transmittance of the transmittance curves 21, 22, and 23 are 40%, 35%, and 30%, respectively. The transmittances 21b, 22b, and 23b for green light of 534 nm are 80%, 75%, and 70%, respectively.

  The color vision correction lens according to the second embodiment has a sensitivity curve M2 of M cone cells shown by a two-dot chain line in FIG. 5 and sensitivity curves L and S of L and S cone cells which are the same as those of a person with normal color vision. Then, the assumed color-blind person C is targeted. Since the sensitivity curve M2 of M-pyramidal cells is lower than the sensitivity curve M of M-pyramidal cells of a person with normal color vision, the color-blind person C has a relative sensitivity curve between M-pyramid cells and L-pyramid cells. It is assumed that the red-green color perception is abnormal because the relationship is different from that of a person with normal color vision. Therefore, in the color vision correction lens according to the second embodiment, a transmittance curve having a minimum value of transmittance is provided in a wavelength region of 560 nm or more and less than 570 nm near the peak wavelength 564 nm of the sensitivity curve L of the color vision deficient C, By lowering the peak of the curve L, the relative relationship between the sensitivity curve M2 and the sensitivity curve L is made closer to that of a person with normal color vision, so that the color-impaired person C can distinguish between red and green light.

(Third embodiment)
FIG. 6 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 have minimum transmittance values 31a, 12a, and 13a in a region where the wavelength of light is 570 nm or more and less than 580 nm. In the transmittance curves 31, 32, and 33, the transmittances 31c, 32c, and 33c for yellow light having a wavelength of 564 nm are set to be 30% or more higher than the minimum values 31a, 32a, and 33a, respectively. In the example of FIG. 6, the minimum values of the transmittance of the transmittance curves 31, 32, and 33 are 40%, 35%, and 30%, respectively, and the transmittance curves 11, 12, and 13 correspond to yellow light having a wavelength of 564 nm. The transmittances are 80%, 75%, and 70%, respectively.

  The color vision correction lens according to the third embodiment has a sensitivity curve M3 of M cone cells shown by a two-dot chain line in FIG. 7 and sensitivity curves L and S of L and S cone cells same as those with normal color vision. It is intended for the assumed color-blind person D. In the color vision impaired person D, the sensitivity curve M3 of M cone cells is located on the higher wavelength side than the sensitivity curve M of M cone cells of normal color vision person, and is close to the sensitivity curve L of L cone cells. It is assumed that the red-green color perception is abnormal. The wavelength of the peak M3p of the sensitivity curve M3 of the color vision deficient person D is located in a region of 570 nm or more and less than 580 nm, and even if the transmittance of light having a wavelength around 534 nm is suppressed as in a conventional color vision correction lens, There is not much difference between the sensitivity curves M3 and L. Therefore, in the color vision correction lens according to the third embodiment, a transmittance curve having a minimum value of transmittance is provided in a region where the wavelength of light is 570 nm or more and less than 580 nm, and the sensitivity curve M3 is reduced by lowering the peak of the sensitivity curve M3. And the sensitivity curve L to make the color-blind person D distinguish between red and green light.

(Other embodiments)
The transmittance curves 41, 42,..., 50 in FIG. 9 show the transmittance curves of the color vision correction lens according to another embodiment of the present invention. If the color vision abnormality is caused by the peak wavelength of any of the sensitivity curves of the L, M, and S pyramidal cells being different from that of a normal color vision person, the transmittance of light in the wavelength region where the peak wavelength exists is determined. By wearing a color vision correction lens provided with a transmittance curve that suppresses color vision, color vision correction can be performed. The transmittance curves 41, 42,..., 50 indicate that the peak wavelength of any of the sensitivity curves of the L, M, and S pyramidal cells is (450 + 10 × N) nm or more and (460 + 10 × N) nm or less (N = 0,1,2,3,4,5,13,14,15,16,17) in order to suppress the peak of the sensitivity curve of a color-blind person having color-blindness caused by moving to the region. 4 is a transmittance curve in which a minimum value of the transmittance is provided in the region in order to suppress the transmittance of light in the region.
In FIG. 9, reference numerals 14, 24, and 34 indicate transmittance curves of the color vision correction lenses according to the first, second, and third embodiments, respectively.
For example, as shown in FIG. 9, by preparing a color vision correction lens set in which a plurality of lenses having different areas to which the minimum value of the transmittance belongs belong, color vision cannot be corrected by the conventional color vision correction lens. By having a person with color vision deficiency try the lenses of this color vision correction lens set, the number of color vision deficient persons who can correct color vision deficiency can be greatly increased.

  As described above, the color vision abnormality experience lens of the present invention is not limited to the above-described embodiment. For example, in the first and third embodiments, the difference between the minimum value of the transmittance and the transmittance of yellow light having a wavelength of 564 nm is 30%. May be less than. In the second embodiment, the difference between the minimum value of the transmittance and the transmittance of green light having a wavelength of 534 nm may be less than 30%. The minimum value of the transmittance is not limited to the above value.

Transmittance curves 11, 12, 13, 14, 21, 22, 23, 24, 31, 32, 33, 34, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50
Minimum values 11a, 12a, 13a, 21a, 22a, 23a, 31a, 32a, 33a

Claims (6)

A color vision correction lens that corrects the color vision of a color blind person,
A color vision correction lens comprising a transmittance curve having a minimum transmittance in a region where the wavelength of light is at least 550 nm and less than 560 nm. A color vision correction lens that corrects the color vision of a color blind person,
A color vision correction lens comprising a transmittance curve having a minimum transmittance in a region where the wavelength of light is 560 nm or more and less than 570 nm. A color vision correction lens that corrects the color vision of a color blind person,
A color vision correction lens comprising a transmittance curve having a minimum value of transmittance in a region where light wavelength is 570 nm or more and less than 580 nm.   4. The color vision correction lens according to claim 1, wherein the minimum value of the transmittance is 30% or less lower than the transmittance of yellow light having a wavelength of 564 nm. 5.   3. The color vision correction lens according to claim 1, wherein the minimum value of the transmittance is 30% or more lower than the transmittance of green light having a wavelength of 534 nm. 4. A color vision correction lens that corrects the color vision of a color blind person,
A color vision correction lens comprising a transmittance curve having a minimum transmittance in a region where the wavelength of light is 450 nm or more and less than 510 nm, or in a region where light wavelength is 580 nm or more and less than 630 nm.

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