JPH11119638A - Method of manufacture filter for cataract pseudo-experience device and cataract pseudo-experience device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter for a cataract pseudo-experience with which a normal person can view just as a cataract patient with the corresponding symptom actually views when a normal person uses it. SOLUTION: Plural sheets of filters for haze evaluation, brightness evaluation, and color taste evaluation at different evaluation steps are prepared, respectively. And, cataract visual check experiments are carried out by using these evaluation filters overlapped as necessary, and an optical combination of these filters is selected based on the result of this cataract visual check experiments, and a filter for the cataract pseudo-experience is manufactured according to this selected filter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device that allows a normal person to simulate the appearance of a person suffering from cataract, and to a method of manufacturing a filter used therefor.

[0002]

2. Description of the Related Art As a person becomes older, their vision deteriorates. One of them is cataract due to clouding or yellowing of the lens. Although this cataract varies in its symptoms, it is one of the aging phenomena affecting most of the elderly.

[0003] In Japan, the ratio of the elderly population is rapidly increasing and is expected to further increase in the future. It is becoming increasingly important to know enough of the situation and to consider the elderly.

[0004] Regarding cataracts that affect most of the elderly,
A filter has already been developed that allows normal people to simulate cataracts, and this filter can be used to develop and manufacture facilities and products for the elderly, and to deepen the consideration of the elderly by knowing the actual conditions of the elderly. Have been done.

[0005] One such filter is the "Instant Senior" developed by the Government of Ontario, Canada.
There is a goggle type cataract simulation device called a goggle type. The filter used in this device is based on the spectral transmittance distribution of the crystalline lens extracted from the cataract patient, and faithfully optically reproduces this. The spectral transmittance distribution of this conventional filter is indicated by Q in FIG.

[0006]

The above-mentioned prior art uses a filter that faithfully and optically reproduces the lens of a cataract patient, so that if a normal person uses this filter, he or she can see through the eyes of the cataract patient. It was generally believed that one could have a more faithfully recreated simulated experience.

[0007] However, when a large number of cataract visualization experiments using the above-mentioned conventional goggles were performed on a person who became a normal person after cataract surgery, the appearance before cataract surgery was memorized. It turned out that the appearance was slightly closer to the severe side than the appearance. Therefore, when a normal person wears the above-mentioned conventional goggles and performs, for example, color design of a product, a cataract patient with moderate symptoms often seen in the elderly (a patient who has a slight inconvenience in daily life) However, there is an inconvenience that the design is intended for severe cataract patients.

The cause is as follows. That is,
When people look at things, they do not recognize the light that has passed through the crystalline lens as it is, but look at the object while correcting it with the brain. In other words, cataract is an aging phenomenon in which the lens gradually becomes cloudy and yellow, and as the years elapse, the appearance of the lens adapts to the function of the brain to compensate for the deterioration of the lens. Therefore, in the case of using the above-described conventional example, since the correction and adaptation in the brain are not taken into account, the appearance is slightly more emphasized than the actual appearance.

[0009] Also, from the person who conducted the above cataract recognition experiment,
Compared to the experience actually experienced before the surgery, the impression when wearing the conventional goggles and experimenting showed that the haze increased, the brightness became dark, and the yellow color was felt quite tight. Was. This can be inferred from the spectral transmittance distribution of the conventional filter indicated by Q in FIG. That is, the spectral transmittance distribution of the above-mentioned conventional example shows that the spectral transmittance sharply changes around 550 nm, and the spectral transmittance on the long wavelength side (red side) is at least four times the spectral transmittance on the short wavelength side (violet side). It can be understood from the above.

In view of the above, the present invention takes into account the fact that a person with cataract takes into account the correction and adaptation in the brain when actually looking at the object, and taking this into account, the corresponding symptoms when used by a normal person. It is an object of the present invention to provide a method for producing a cataract simulating experience filter and a cataract simulating apparatus that look as if the cataract patient is actually seeing.

[0011]

In order to achieve the above object, a method of manufacturing a filter for simulating a cataract according to the present invention evaluates each of a haze evaluation filter, a brightness evaluation filter, and a color evaluation filter. Prepare a plurality of filters of different stages, perform a cataract visualization experiment using a filter obtained by superimposing these evaluation filters as necessary, and select an optimal combination of filters based on the results of the cataract visualization experiment Then, a filter for simulating a cataract is manufactured based on the selected filter.

In the above-described cataract recognition experiment, an experiment is first performed using a plurality of haze evaluation filters having different evaluation stages, and a haze evaluation filter in a certain evaluation stage is selected. An experiment is performed by superimposing each of a plurality of brightness evaluation filters having different evaluation stages on an evaluation filter, and selecting a certain combination of filters, and further, if necessary, further selecting the selected combination of filters. Further, it is preferable that an experiment is performed by superimposing a plurality of color evaluation filters having different evaluation stages, and a certain combination of filters is selected.

In producing a filter for simulating a cataract, a filter for evaluating haze, a filter for evaluating brightness, a filter for evaluating tint, or an optically equivalent optical filter to these filters, which constitute an optimal combination of filters. It is preferable to produce a filter for cataract simulation experience by superimposing the filters, or to produce an optically equivalent filter based on the haze degree and spectral transmittance distribution data of the optimal combination of filters.

In order to achieve the above object, a cataract simulating apparatus of the present invention is provided with a cataract simulating filter manufactured by the above manufacturing method.

In the above cataract simulating device, the cataract simulating filter may be held by a frame of goggles or eyeglasses, or the cataract simulating filter may be mounted on a front surface of a video display device such as a personal computer display or a television. Or a filter for simulating a cataract is provided on the incident optical path of an imaging device such as a camera or a video camera.

According to the present invention, a cataract simulating experience filter having a cataract patient with a corresponding symptom looks as if the cataract patient has the corresponding symptom based on a cataract visual recognition experiment in which haze, brightness and color are taken into consideration. A cataract simulated experience using this filter can be very close to the actual experience of a cataract patient. Therefore, for example, when a normal person performs color design of a product for cataract patients with moderate symptoms that are often seen in the elderly (patients who have a little inconvenience in daily life), by using the above filter, The design can be made with almost the same appearance as that seen by a person suffering from moderate cataract, and the optimal color design can be made.

Further, in order to achieve the above object, the cataract simulating apparatus of the present invention has a spectral transmittance distribution in a wavelength range of 430 to 750 nm, wherein the spectral transmittance on the long wavelength side is smaller than the spectral transmittance on the short wavelength side. It is characterized by comprising a cataract pseudo-experience filter which is manufactured so as to be smoothly continuous at a high state and set so that the highest spectral transmittance is within twice the lowest spectral transmittance.

In particular, those having a spectral transmittance distribution in the range of 430 to 750 nm in the range of 30 to 60% are suitable for simulating the cataract with moderate symptoms.

According to the present invention, the difference between the long-wavelength side and the short-wavelength side of the filter for the cataract pseudo experience filter is significantly smaller than that of the conventional example. By the change of the above, what is equivalent to the correction or adaptation performed by the cataract person in the brain can be performed on the filter. Therefore, the cataract simulated experience device of the invention described above can provide a cataract simulated experience that is very close to the actual experience of a cataract patient.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In producing a filter for simulating a cataract, the following cataract recognition experiment was performed. The data collection at that time was performed as follows.

An experiment was conducted on 50 patients on the third day after surgery on one eye with binocular cataracts having no disease other than cataracts, and asked to reproduce the memory of the appearance of the cataract before surgery. By the method, 50 data on the appearance of cataracts were collected.

At this time, the difference between the appearance before and after the operation can be expressed relatively reliably by relying on the appearance of the remaining cataract in a patient whose cataract remains in one eye. I made it possible.

Further, in order to increase the credibility of the memory of the appearance before the operation, it is necessary to take data at an early stage after the operation without losing the memory. Therefore, it was set to collect data three days after the operation as the earliest day at which an object can be judged by looking at an object in a normal state.

For each of the haze evaluation filter, the brightness evaluation filter, and the color evaluation filter which are assumed to be related to the appearance of the cataract, a plurality of filters having different evaluation stages were prepared as described below.

Haze evaluation filters (5 types): F
1, F2, F3, F4, F5 The greater the number, the stronger the haze. Brightness evaluation filters (3 types) L1, L2, L
3 The larger the number, the darker it gets.

Color evaluation filters (5 types): C
1, C2, C3, C4, C5 C1 to C3 are red-orange, C4
5 to 5 are yellowish colors, and the larger the number, the darker.

The haze was measured by a measuring device shown in FIG. In FIG. 6, reference numeral 11 denotes a clear light bulb (60
W) and 12 are cylinders having a black cloth on the inner peripheral surface, and 13 is an illuminometer. A haze evaluation filter F1 is provided on the lower surface of the cylinder 12.
A filter installation hole 12a for setting .about.F5 is provided.

The dimensions such as the distance between the cylinder 12, the filter installation hole 12a and the illuminometer 13 are as shown in FIG.

First, the illuminance was measured without setting the haze evaluation filters F1 to F5.

The value was 390 lux. Next, the haze evaluation filters F1 to F5 are sequentially inserted into the filter installation holes 12.
a, and the illuminance of each was measured.
It was 3 lux, 326 lux, 297 lux, 293 lux and 250 lux.

Since the degree of haze indicates the rate at which the illuminance decreases due to the dispersion of light, the haze evaluation filters F1 to F5
The degree of haze is as follows.

F1 = (390-343) / 390 = 12% F2 = (390-326) / 390 = 16% F3 = (390-297) / 390 = 24% F4 = (390-293) / 390 = 25 % F5 = (390−250) / 390 = 36% First, each experimenter was asked to see the evaluation sheet through the haze evaluation filters F1 to F5 in each evaluation stage with eyes that became normal after the operation. Then, he / she selected the haze evaluation filter that looks closest to the memorable pre-surgery appearance (in some cases, there is almost no haze in the memorable pre-surgery appearance, and the haze evaluation filter Was sometimes unnecessary.)

Next, each experimenter was asked to view the evaluation sheet through the selected haze evaluation filter and the brightness evaluation filters L1 to L3 at each evaluation stage with the eyes that became normal after the operation. Then, they selected a brightness evaluation filter that looks like the haze closest to the memorable pre-surgery appearance and the brightness state (in some cases, compared to the memorable pre-surgery appearance, There is a case where there is almost no need to lower the brightness and a brightness evaluation filter is unnecessary.)

Then, each experimenter is asked to select a haze evaluation filter, a brightness evaluation filter, and a tint evaluation filter C1 to C5 at each evaluation stage with the eyes that become normal after the operation.
Through the evaluation sheet. Then, they were asked to select a tint evaluation filter that looks like the haze, brightness, and tint that is closest to the memorable appearance before surgery (in some cases, compared to the memorable appearance before surgery) In some cases, there was almost no change in the tint, and a tint evaluation filter was unnecessary.)

The results of the above experiments are as shown in (Table 1). In the above experiment, L3, C4, and C5 were not selected by the experimenter.

[0037]

[Table 1]

From the above experiment, a combination of filters suitable for the cataract simulation experience according to the degree of cataracts from A to E was selected as shown in the following (Table 2).

[0039]

[Table 2]

A = F1 only, which is a filter that allows the user to simulate the appearance of a light cataract that does not cause much inconvenience in daily life. E = F5 + L1 + C3, which is a filter that allows the user to simulate the appearance of a fairly heavy cataract. During that time, B = F2 + C1, C = F2 + L1 + C2,
D = F2 + L1 + C1.

With reference to the comments of the experimenter and the like, among the above filters, the combination of D = F2 + L1 + C1 is considered to be a filter that can simulate the appearance of a moderate cataract where the inconvenience in daily life has begun to occur. Was. In the present embodiment, a filter manufactured based on this combination is a representative example of the cataract pseudo experience filter.

The haze evaluation filter F2 and the brightness evaluation filter L1 superimposed by the combination D of this representative example
By using the color evaluation filter C1 as it is, as shown in FIG. 1, a standard cataract simulated experience filter 1a capable of simulating the appearance of a moderate cataract can be obtained, as shown in FIG. The standard cataract simulated experience device 2 can be obtained by attaching the cataract to both frames of the eyeglass body 3.

Alternatively, the filters F2, L1, C1
By superimposing each optically equivalent filter with, a standard cataract simulation filter can be manufactured,
Further, a cataract simulated experience device can be manufactured using this.

Further, based on the haze and the spectral transmittance distribution data of the superposed filters of the combination D, one optically equivalent filter (indicated by 1b in FIG. 1) is manufactured. Is a standard cataract simulating filter, and a cataract simulating device can be manufactured using the filter.

The spectral transmittance distribution of the superposed filters of the combination D is as shown by D in FIG. As is clear from the comparison with that of the conventional example Q, in the case of D, the difference between the spectral transmittance on the long wavelength side and that on the short wavelength side is small. The maximum spectral transmittance on the side is about 53% and the minimum spectral transmittance on the short wavelength side is about 39%, and the difference is extremely small. It has been found that such a filter for simulating a cataract having a spectral transmittance distribution is optimal as a tool for allowing a normal person to accurately simulate the appearance of a moderately cataract patient.

FIG. 4 shows the spectral transmittance distribution of not only the combination D but also the combinations A, B, C and E. In order to perform an extremely mild cataract simulated experience, a cataract simulated filter manufactured based on the combination A may be used, and to perform an extremely severe cataract simulated experience, the combination E may be used. What is necessary is just to use the cataract simulated experience filter manufactured based on it.

As a result of examining the spectral transmittance distribution of each of the combinations A to E shown in FIG. 4, as a filter for simulating a cataract, the spectral transmittance distribution in the wavelength range of 430 to 750 nm was changed to that of the longer wavelength side. If the transmittance is higher than the spectral transmittance on the short wavelength side and continues smoothly, and if the highest spectral transmittance is less than twice the lowest spectral transmittance, the appearance of cataract patients will be improved. It has been found that a normal person can be simulated exactly.

In particular, as a standard cataract simulating filter for reproducing the appearance of a moderately cataract patient, a wavelength of 4
The spectral transmittance distribution in the range of 30 to 750 nm is 30
Those in the range of ６０60% were suitable.

In the above-described embodiment, the cataract simulating experience device 2 is constructed by mounting the cataract simulating experience filter 1a (also indicated by 1b) on the frame of the spectacle body 3. However, the cataract simulating experience device may be mounted on goggles. Is also possible.

As shown in FIG. 3, a cataract simulating filter 1b (also indicated by 1a) supported by a ring 5 is mounted on an incident optical path of a photographing device 4 such as a camera or a video camera. Thus, the cataract simulation device 2 can be configured.

[0051]

The cataract simulating filter and the cataract simulating device of the present invention are manufactured based on specific data in accordance with the actual situation, and therefore have a very good effect on the actual appearance of a cataract person. This has the effect of allowing a close simulated experience. Utilizing the above filters and devices that can provide such a simulated experience as a tool for education and enlightenment to experience cataracts, and as a cataract simulated experience tool in the field of product design and design Can be.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one example of a filter for simulating a cataract of the present invention.

FIG. 2 is a perspective view showing one example of a cataract simulation apparatus of the present invention.

FIG. 3 is a perspective view showing another example of the cataract simulation apparatus of the present invention.

FIG. 4 is a graph showing each spectral transmittance distribution of a filter for simulating a cataract according to a combination of A to E.

FIG. 5 is a graph showing a spectral transmittance distribution by comparing a filter for simulating a cataract according to a typical combination D with that of a conventional example Q;

FIG. 6 is a schematic diagram showing an apparatus for measuring the degree of haze of a haze evaluation filter.

[Explanation of symbols]

 1a, 1b Cataract simulated experience filter 2 Cataract simulated experience device F2 Haze evaluation filter L1 Brightness evaluation filter C1 Tint evaluation filter

Claims (10)

[Claims] 1. A filter in which a plurality of filters having different evaluation stages are prepared for each of a haze evaluation filter, a brightness evaluation filter, and a tint evaluation filter, and these evaluation filters are overlapped as necessary. Performing a cataract visualization experiment using a cataract, selecting an optimal combination of filters based on the result of the cataract visualization experiment, and manufacturing a cataract pseudo experience filter based on the selected filter. How to make a simulated experience filter. 2. In the cataract recognition experiment, first, an experiment is performed using a plurality of haze evaluation filters having different evaluation stages, and a haze evaluation filter in a certain evaluation stage is selected.
Next, if necessary, an experiment is performed by superimposing each of a plurality of brightness evaluation filters having different evaluation stages on the selected haze evaluation filter, and selecting a certain combination of filters. The cataract simulation experience filter according to claim 1, wherein an experiment is performed by superimposing a plurality of color evaluation filters each having a different evaluation stage on the selected combination filter, and selecting a certain combination filter. Production method. 3. A cataract simulated experience by overlapping a haze evaluation filter, a brightness evaluation filter, a color evaluation filter, or an optically equivalent filter that constitutes an optimal combination of filters. The method for producing a filter for simulating a cataract according to claim 1 or 2, wherein the filter is produced. 4. The filter according to claim 1, wherein an optically equivalent filter is manufactured based on the haze degree and the spectral transmittance distribution data of the optimal combination of filters, and the filter is used as a cataract simulated experience filter. How to make a filter for cataract simulation experience. 5. A cataract simulated experience device comprising a cataract simulated experience filter manufactured by the method for producing a cataract simulated experience filter according to claim 1, 2, 3 or 4. 6. The cataract simulating device according to claim 5, wherein the cataract simulating filter is held by a frame of goggles and eyeglasses. 7. The cataract simulating device according to claim 5, wherein the cataract simulating filter is disposed on a front surface of a video display device such as a personal computer display or a television. 8. A cataract simulating filter is a camera,
The cataract simulation device according to claim 5, wherein the device is provided on an incident optical path of a photographing device such as a video camera. 9. The spectral transmittance distribution in the wavelength range of 430 to 750 nm is smoothly continued while the spectral transmittance on the long wavelength side is higher than the spectral transmittance on the short wavelength side.
An apparatus for simulating a cataract comprising a cataract simulating filter manufactured so that the highest spectral transmittance is within twice the lowest spectral transmittance. 10. A spectral transmittance distribution in a wavelength range of 430 to 750 nm is in a range of 30 to 60%.
The cataract simulation experience device described.