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Extra info - discrimination in Japan
This test, aside from its scientific value, has long been applied to institute kinds of social discriminations in Japan, and probably in other countries as well, throughout the 20th century. Particularly before 1950s, those who failed to pass this tests were excluded from engineering schools, military services, and other professions considered needing the ability to differentiate colors. It was a celebrated story that one of the kins of the fiancee of the late Emperor was found to be colorblind, as the test was first applied to the students of the royal school. In spite of the rampant objections within the royal household raised against the marriage, since the colorblindness became known to be hereditary, the Emperor persisted to fulfill the engagement. He was long praised for the decision, and the episode contributed greatly to remove the baseless discrimination caused by the wrong way of application of the test.
Constructing the designs
How are the "patterns and colours of dots" selected so that they present the various different numerical/non-patterns? (For these or "any other similar designs.") Jackiespeel (talk) 21:33, 20 April 2008 (UTC)
"Ishihara Plate No. 19 (2)"
The Ishihara Plate No. 19 in the gallery doesn't show a 2. It shows nothing. People with red green color blindness can trace a line (and don't see a 2 or any other number).  --StYxXx (talk) 08:05, 29 July 2013 (UTC)
- I can see a "2" in plate 19 quite clearly. I appear to have mild Deuteranopia according to the tests.22.214.171.124 (talk) 08:51, 10 September 2013 (UTC)
Exact! The Plate No. 19 presented here does not correspond to standard Ishihara Test. In this image, a person with normal vision can see clearly "2", and a person with color blind to red/green may not see anything. The Ishihara Plate is not the same: http://www.dfisica.ubi.pt/~hgil/p.v.2/Ishihara/Ishihara.24.Plate.TEST.Book.pdf Andreluis7mmv (talk) 14:22, 27 January 2015 (UTC)
- Huh what do you mean exactly? The plate No. 19 featured in this article clearly doesn't show anything for people with normal color vision. It will show "2" for people with color deficiency. The one in your pdf file is a tracing plate, and people with normal color vision also can't see anything there, but color blind people will see a line and can trace it.--Krystaleen 14:58, 28 January 2015 (UTC)
Scientific Write Up?
Has anyone come across an academically written write up of the experimental process Ishihara went through to create these plates. I'd be very interested to read such, and I think this page would benefit from a link to such.Da5nsy (talk) 14:36, 6 May 2014 (UTC)
I'm 99% sure this is 74 x.x ; modify hue & saturation, and it looks obvious.