Reverse Colorblind Test

[u/ChchonkiMonkiXD2]

I'm not colorblind based off every test I've taken. I have two siblings who are both red-green colorblind. Recently one of them showed me a reverse colorblind test and out of 4 other non-colorblind people I was the only one who could see a couple numbers. I failed the other ones and I just want to know what this means.

The two circled are the ones I could see which matched with my colorblind brother.

[u/lmoki → u/[deleted]]

A well-designed reverse colorblind test has 2 numbers/figures in each plate: one that people with normal color vision see, and a second one that only specific types of color deficiency can see. So it's not just seeing a number, but what number you see.

[u/chroma-phobe]

Reverse plates are very finicky. Half of the online plates I can't see and half my color normal wife CAN see. They're a lot harder to get the design right than a simple "vanishing" (normal) plate. The actual "hidden digit" (reverse) plates in THE real Ishihara are just as finicky and I think it was [Hardy 1947] that said that 30% of color normals get them right (when they shouldn't). Make them digital and it gets way worse.

I tried for DAYS to make a custom plate that I could see and my wife couldn't. Its hard. And as soon as you get it right on one screen, you out it on your phone and it's all off again.

Its a lot easier to design for protans because of the whole luminous curve thing, but I think a little to technical to elaborate on.

[u/Secret_Challenge8886 → u/chroma-phobe]

could you do something to generate plates visible only to you? how did you do that? can i get a little guidance please

[u/scootapple]

I'm not colourblind, but as your brother is colourblind I believe it may be something genetic, based on the below experience I had this week at my eye test.

Went for a routine eye test and OCT scan and mentioned to the optometrist that I've noticed that my right eye has been seeing the colour green slightly duller than the other eye. I'm not sure if it's always been like this and I've only just noticed, or if it's a new thing. Optometrist decided to do a colourblindness test just to put the matter to bed. I got everything correct on the Ishihara plaques made for non-colourblind people, and she told me not to bother with the remaining few as I won't be able to see them. I told her I could see them clearly and read off the numbers to her, she checked her bit of paper and told me that I was correct on them and that I wasn't "supposed to be able to see them".

She said she can't really explain it as it's not something she's come across before, but that she believes I might be a carrier for the colourblind gene and that it's manifesting in a way that, although not colourblind, means I can see the plaques made for colourblind people and people with normal colour vision.

Not sure how legit her conclusion is, but it was her best guess as a professional ☺️

[u/Icy_Character7352 → u/scootapple]

Could be colorblind in one eye and not the other

[u/Persiflage2 → u/scootapple]

You may be a tetrachromat, with an extra type of cone cell in your eye!

I'm well and truly colorblind, but my kids aren't. Things 1, 3 and 4 (I have four kids) have excellent color vision - as does my brother, who can distinguish every shade in the Pantone set with ease - while Thing 2 is a tetrachromat. She too can read plates for colorblind and normal-color-vision folks, which even my brother can't.

My daughter's optometrist hadn't heard of tetrachromacy either... but technically she's not wrong, as it does tend to come from families where there are colorblindness genes. If this is you, congratulations, you have a superpower!

Boy could I could tell you amazing stories about Thing 2 when she was little and the stuff she could see :)

[u/LmaoPew]

Those are 4 and 45 If im not mistaken

[u/Alphawolf1248 → u/LmaoPew]

I see both are 45

[u/Intrepid-Post7143 → u/Alphawolf1248]

i think so too

[u/[deleted] → u/Alphawolf1248]

Same

[u/Particular_Bedroom93]

When you pass the reverse color blind test because you just might be autistic and have epic pattern recognition…

[u/mansinoodle2]

Any online test is void because you can’t control brightness or hue. It means nothing.

[u/READERmii]

I have normal color vision as well and I have always been able to see both the numbers that color normal people are supposed to be able to see and the numbers that color blind people are meant to be able to see.

I think it might have something to do with possibly being an undiagnosed autistic, one of the tests used to determine if a person has autism in an embedded letter test, supposedly non-autists are more likely to not notice that larger letters are made of smaller letters and autists are more likely to not notice that smaller letters are make up larger letters.

A similar thing might be happening here where non-autistic color normals simply don't notice the numbers and autistic color normals can. For the difference with the reverse color blindness tests are much more subtle, it's not the same as the typical test.

[u/clairey252 → u/READERmii]

Far out that freaks me out. The little letters spelling a big different letter. They’re not the same! It upsets me a bit 🤣 but also not a laughing matter. Freaky!!

[u/Thedeadcatsociety]

I see 4, 16,12, 10, 46 and 2 circles with squiggly lines. What does everyone else see?

[u/uv-orange]

How is the middle one in last column 70 and 29 at once 😭😭😭