RGB Anomaloscope — Color Blindness Test
The following tool is a very simple red-green color blindness test. Just try to match the two colors you seen in the boxes below. If you get a match, press Match OK and if you can’t match them use the No Match possible! button. That’s all.
The first anomaloscope was developed in the 20th century and since then it is the most accurate color blindness test instrument used by eye specialists all around the world.
An anomaloscope is based on a color match. Two different light sources have to be matched to the same color. On one side you have a yellow color which can be adjusted in brightness. The other side consists of a red and a green light whereas the proportion of mixture is variable.
As every color on a computer display is made up from the three base colors red, green, and blue, an anomaloscope can’t really be reproduced online. So this red-green color blindness test is just a simple reproduction with room for improvement.
February 29th, 2008 at 11:50
Interesting test. Thanks.
I can’t get the ‘green-blind’ example chart to work though. Also, is there an example chart for normal colour vision?
February 29th, 2008 at 11:54
The chart for ‘green-blind’ is still missing. I’ll add it in the next days. - Normal color vision means, you can’t make any match at all. Or at most two matches in the center of the diagram but nothing else.
February 29th, 2008 at 23:56
Very interesting,I had 2 matches in the centre of the diagram,so did my wife,and she is “Color Normal”.
March 1st, 2008 at 0:05
Need to correct my last statement,my wife Made 3 Matches!!,I only made two?very very interesting,as she is “color normal”.
March 6th, 2008 at 15:54
I had about 5, or thereabouts. I lost track.
I really want to take an actual anomaloscope test conducted by an optometrist. That would be pretty interesting, especially for comparison purposes. Has anyone here actually done that?
Here’s an interesting link to a training lecture on how to administer an anomaloscope test geared towards aspiring optometrists that I found too.
http://arapaho.nsuok.edu/~salmonto/VSII/Lecture34.pdf
March 13th, 2008 at 4:51
Hi
I am from europe and I wanted to avoid compulsory military service so I took an anomaloscope test (I already knew I was red-blind from taking Ishihara tests at school but the military only accepts anomaloscope results).
The results I got from this web based test pretty much match what I got from the real anomaloscope. Almost complete lack of red cones.
So your test is accurate. I use an LCD monitor at neutral colour temperature and 0.8 gamma. (At proper gamma settings I was unable to tell red from green so that’s why it is set so low.)
March 16th, 2008 at 12:36
When I moved the top bar to the right to get a yellow colour in the left box I got two matches, but when I kept the top bar in its original position and to keep the left box green or red I got no matches. Either way the test said I have no, or little red-green colour blindness. And it didn’t matter what settings I had my monitor on. Though I found it strange I did so well on this anamaloscope, even though I already knew I was mildly colour blind, when I had such trouble with some of the Ishihara Plates.
March 16th, 2008 at 13:56
David, you have to move the slider each time to try to get a match. And if you can only match it a few times it really is just a mild form of red-green color blindness. See some other test results at RGB Anomaloscope Color Blindness Test.
March 17th, 2008 at 20:39
I had like 6 match. I guess I am in that percentage of woman that are color deficient. Oh well… : )
March 19th, 2008 at 21:03
I had at least 4, I guess I am in that percentage too :o)
March 20th, 2008 at 15:27
Nice test.Quick and acurate..I knew have a mild to moderate red-green colur deficiency,but never felt embarassed or deficient.You feel it only when you are subjected to a colour vision test,otherwise in normal life ITS ALL ABSOLUTELY NORMAL .Yuo dont feel it at all
April 15th, 2008 at 22:46
I’m female and colour normal but I got two matches and the results claim I’m therefore moderate-strong red-green colour blind. This test says that shouldn’t be possible.
There is a lot of inherited colour-blindness among the men in my family but I’ve always passed tests and been classified as colour normal. Admittedly, I have no trouble seeing the numbers colourblind people are supposed to see, but I’ve never had trouble seeing the numbers normal-sighted people are supposed to see either.
I do argue with people a lot about shades, however, rather than the actual colours, and I noticed the two matches I got here were on yellow boxes. I wonder if I just missed shading subtlety?
April 16th, 2008 at 7:28
Louise, if you had only two matches it should state, that you are either not colorblind or have only a very mild form of it. Some people with normal vision can match the bright yellow with some light shades of green or red - and some can’t.
April 19th, 2008 at 19:22
It’s a fascinating site. I’ve been taking some of the tests here because my partner and I disagree over some shades of blue/green - whether they’re blue or green. Anyway, I match three of the colors on this test but on all the other tests I come out as color ‘normal’. I’m a bit like Louise maybe.