No, the difference is that not every test image comes up in every grouping of 8. I am not colorblind (aside from a slight apparent weakness in the green-blue border) and got 8 of 8 correct. It’s the test with “7” that several posters remarked was difficult.
Oh, I see.
Actually, getting a FULL Ishihara test is quite lengthy, and there are some cards that are only used for specialist and obscure diagnosis. Does anyone have a decent link for more about that test? I’m wondering how anyone ever managed to come up with something that, for example, tests for achromotopisa.
OK, thanks!
I spotted the 16 in the first two circles, but I can’t see numbers in any of the rest of the circles. They just look like a bunch of colored dots contained in a circle.
Do you know yourself not to be colorblind?
Age 56 have only one working pretty nearsighted eye (other has lens removed due to childhood accident) with astigmatism. Test was very easy all images clearly seen.
I’ve done this on two computers, and with some physical cards in good light. My scores were very different. I think it’s the computer monitor that is “color blind”, not my eyes. that is, I only swapped two cards using physical cards, and it felt easy to line them up. On my mac, I scored “24 wrong” after struggling a bit, and the axis that held most of my errors wasn’t one of the three that people tend to have trouble with. On a PC, I got a lot wrong, and it was really really hard to line up the tiles.
That test is very hard on a computer screen as a lot of it (IMO) is the size of the picture and ability of the monitor. I scored an error rate of “16” wrong which (per the instructions) is a “no concern” level of errors. The larger issue is that even on my 24" screen the entire test space was only about 6 x10 inches. I had to put my nose a few inches from the screen to compare colors.
I got ten for ten but there was one during my last eye exam (earlier this month) that I missed. More I think from the scratch on my old glasses as from anything else.
No, I know I quite colorblind, but I usually can make out 1 or 2 of the numbers if I stare at it long enough and then guess, but not with these. I didn’t even see a hint of any lines that may form numbers.
The test is extremely easy for me, and I fail it everytime (very colorblind here)
Ok, try this sequential image and report how many wide bars you see. I think all the bars are narrow, but there are a few places I cannot see an edge where I think there should be one.
You — well everyone — might find this interesting.
David Pogue, who’s red-green colourblind, wrote it for the New York Times; special glasses specifically designed for his deficiency. It was published in August 2013.
But they’re expensive.
Does that site have an answer? I can count 36 differences. But like you, with some I can’t see an edge where I think there should be one, but I counted the difference anyway. And some are narrower (or wider) than others.
That image depends a lot on the capability of the computer monitor.
Yes, that image doesn’t mean much on a monitor. Especially LCDs aren’t really good for color. And as others said, the real FM100 is with physical chips not on a monitor.
I think what I saw was that there are 39 colors.
He may have been impressed, but those glasses do NOT “cure” colorblindness. That’s why he still can’t pass an Ishihara test with them.
They make it easier for the colorblind to distinguish colors. Which isn’t a bad thing, but I’m not sure it’s worth the high price tag.
No, I don’t find it particularly interesting. But then, I have a rather mild form of colorblindness so maybe it’s not such and issue for me.
This was very easy for me, but I’m not sure why you all arer blathering on about numbers. The slides quite clearly contained the Reader’s Digest version of War and Peace.
I see four wide bars. A purple, a medium blue, a green, and an orange.
This is the most rigorous and useful test I’ve found online as far as data points and user feedback presented. Makes my eyes water trying to get…it…just…right. 
Here’s a good grab-bag summary page for color blindness testing…