General > General Technical Chat

Am colour blind, need help identifying bands

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JohanH:

--- Quote from: 25 CPS on August 26, 2022, 12:31:37 am ---
This is a bit of a tough one since colourblindness takes so many forms.  The overlap issue that the glasses can help out with by notching out the areas of visible spectrum that are doubled up isn't present in any of the -opia types of colourblindness where the sensitivity is severely attenuated or missing entirely.  For example, the glasses won't help much for someone with protanopia since red isn't partially overlapped with something else that can be separated out by notching out the overlap, the red's completely gone.

--- End quote ---

I have an issue with the terminology. Calling everyone with color vision deficiency "color blind" is flatly wrong. When I took the color test first time, the nurse flatly stated, "oh, you can't become an electrician now when you are color blind", even if the test showed I only had an issue with some red-green shades. I could even hear her snickering when I didn't see a number on one of the test pages that she could see! I have no issue separating red and green cables, or color of traffic lights, it's only closer shades of red and green I have an issue with. It's like even the professionals don't get it, that there are indefinite shades of colors and it's the majority's color vision that has defined where the boundaries go between different basic colors and shades. Someone with protanopia can correctly be called color blind, but if you have a lesser deficiency and can distinguish separate basic colors, it shouldn't be called "blindness". Clearly the tests are created so, that you can determine if the person is totally blind, or only has a certain degree of color deficiency. They should have made a numbered scale for it, just like for normal vision. I get that the scale can't be made accurate, but at least it would give an indication.

pcprogrammer:

--- Quote from: JohanH on August 26, 2022, 06:01:08 am ---I have an issue with the terminology. Calling everyone with color vision deficiency "color blind" is flatly wrong. When I took the color test first time, the nurse flatly stated, "oh, you can't become an electrician now when you are color blind", even if the test showed I only had an issue with some red-green shades. I could even hear her snickering when I didn't see a number on one of the test pages that she could see! I have no issue separating red and green cables, or color of traffic lights, it's only closer shades of red and green I have an issue with. It's like even the professionals don't get it, that there are indefinite shades of colors and it's the majority's color vision that has defined where the boundaries go between different basic colors and shades. Someone with protanopia can correctly be called color blind, but if you have a lesser deficiency and can distinguish separate basic colors, it shouldn't be called "blindness". Clearly the tests are created so, that you can determine if the person is totally blind, or only has a certain degree of color deficiency. They should have made a numbered scale for it, just like for normal vision. I get that the scale can't be made accurate, but at least it would give an indication.

--- End quote ---

We are sliding of the original topic of identifying inductors, but you have a fair point. And we all have to be aware that color perception is an individual concept. I have differences in blue between the left and right eye, I can clearly see this when looking at the sky. There is a slight color shift when I look with only one eye open.

Bicurico:
I have over-simplified how the glasses work, but yes:

- They work by filtering out frequencies which the patient receptors of different base colors will overlap.
- There are many different causes for what is known as "color blindness": some people only have two color receptors, others have too much overlapping frequencies, etc.
- The manufacturer of these glasses offers an online test that helps determining of the glasses will work for you: please take a look at https://enchroma.com/pages/how-enchroma-glasses-work

The link describes how the glasses work and they offer the test.

Sorry for being offtopic, but it hurts me that there are people with some forms of color blindness that could dramatically improve the way they perceive the world.

Tim88:

--- Quote from: JohanH on August 26, 2022, 06:01:08 am ---
--- Quote from: 25 CPS on August 26, 2022, 12:31:37 am ---
This is a bit of a tough one since colourblindness takes so many forms.  The overlap issue that the glasses can help out with by notching out the areas of visible spectrum that are doubled up isn't present in any of the -opia types of colourblindness where the sensitivity is severely attenuated or missing entirely.  For example, the glasses won't help much for someone with protanopia since red isn't partially overlapped with something else that can be separated out by notching out the overlap, the red's completely gone.

--- End quote ---

I have an issue with the terminology. Calling everyone with color vision deficiency "color blind" is flatly wrong. When I took the color test first time, the nurse flatly stated, "oh, you can't become an electrician now when you are color blind", even if the test showed I only had an issue with some red-green shades. I could even hear her snickering when I didn't see a number on one of the test pages that she could see! I have no issue separating red and green cables, or color of traffic lights, it's only closer shades of red and green I have an issue with. It's like even the professionals don't get it, that there are indefinite shades of colors and it's the majority's color vision that has defined where the boundaries go between different basic colors and shades. Someone with protanopia can correctly be called color blind, but if you have a lesser deficiency and can distinguish separate basic colors, it shouldn't be called "blindness". Clearly the tests are created so, that you can determine if the person is totally blind, or only has a certain degree of color deficiency. They should have made a numbered scale for it, just like for normal vision. I get that the scale can't be made accurate, but at least it would give an indication.

--- End quote ---

This is a coulour blindness test I took a few years ago in the military. It does provide a "scale" of each eye RGB deficiency. I thought it was a neat test...

nctnico:

--- Quote from: Bicurico on August 25, 2022, 10:17:58 pm ---
--- Quote from: JohanH on August 25, 2022, 06:16:52 am ---I've been curious about those "color blind" correction glasses that are touted online, but I haven't bothered when they are all made with tinted lenses (and I would like to use them inside). They supposedly improve color contrast and I'm sure that in theory that could work, unless you have a total lack of color perception. With good lighting I anyway see the difference, so for me they wouldn't be a big benefit anyway.

--- End quote ---

These glasses are amazing. While I don't need them, I have recommended them to students of mine.

They work by filtering frequencies. Colour blind people have receptors that have overlapping response to green/red. The glasses simply work as a filter eliminating a frequency range in-between red and green or blue, whatever.

It does work, but color resolution is reduced.

--- End quote ---
That looks interesting! One of my relatives is color blind. He didn't found out until 16 or so after doing an online test to confirm is suspicion. He went to the doctor to verify but the doctor said that they didn't really have a test for it (and thus nothing in terms of help / aiding as well).

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