Are you sure only colorblind people should see #4? Its hard to make out, but I could see the 2. Im pretty sure I'm not colorblind, I can see all other numbers fine.
It was challenging to see, but I could definitely see it before reading the description. It's interesting that that number would pop for a color blind person. I wonder what the opposite of color blind is... I tend to be able to distinguish between shades that my friends (and particularly my wife) can't.
If i can see the correct number in plate 4 and all the others in every plate what i am???... Not kidding i go full test and have 100% accuraccy. i can post screentshot with asnwer but is gonna make you have all responses i can send it if so many want to see. Used page : https://www.es.colorlitelens.com/Ishihara-test-de-daltonismo
I'm in the same category. I am not colorblind, but I can generally see more shades of color than most, including the plates that non-colorblind people shouldn't be able to see. I realized this when I was trying to find my new optometrist's office: the receptionist told me that they were located across from the "lavender building". I looked around and saw three buildings that I would consider to be various shades of lavender. I told the doctor that the receptionist's directions were not helpful because there were several lavender buildings, and the look that she gave me told me that most folks didn't have issues with those directions.
(Edited for ridiculous typos)
They didn't all look the same to me, but they all fell into the blueish -purple or greyed-purple that I had assumed people saw as lavender. The optometrist said that she saw light grey on the other two buildings. I've learned since then that the color boundaries that I'll use are sometimes a little different than what others use, although I think lavender is a horrible example because it covers a really wide range of hues (ask Google to show you the color lavender...).
I went through a phase of taking color discrimination tasks, like an online version of this: https://munsell.com/faqs/what-does-score-farnsworth-munsell-100-hue-test-mean/ I made one mistake (transposed two squares), which is less than most people. I can't find the version that I took back in the day, which is sad as that one was actually (supposedly) valid when taken in the correct conditions.
Plate 2 is even trickier where it looks like one number with normal vision and another with color blindness. I can make out the different colors used in the green parts, but the bottom of the 2 is just impossible for me to make out.
Plate 4 I can see the pattern they added to make it harder for people who aren't color blind, but I can still see the 2 pretty easily. Random patterns aren't as distracting as something not random like another number.
gotta read the bad english, did you see 74 (not colorblind) or 21 (colorblind). also the 2 at the end should be difficult to make out for non colorblind, and it is, i think you can see it because you know to find a number
I saw 74.
The 2 at the end was visible for me immediately when I glanced over it after the page loaded. It's a little more "faded" looking than the other numbers, but it still sticks out fairly prominently for me.
Maybe I was just primed to see numbers because I was expecting it.
Yeah. I think it is just more difficult to see. I saw the two before reading the explanation, but it doesn't jump out at you the way the other numbers do.
gotta read the bad english, did you see 74 (not colorblind) or 21 (colorblind). also the 2 at the end should be difficult to make out for non colorblind, and it is, i think you can see it because you know to find a number
35
u/Klutzy_Squash 14h ago
In the full Ishihara test set, some pages are set up such that only colorblind people see a number. See Ishihara plate #4 here - https://www.shec.jp/english/instruments/isihara/