Talk:Color blindness

Famous colour blind artist

Clinical and Experimental Optometry has an article showing that Clifton Pugh on biographical, inheritance and other grounds was was a protanope. I have looked hard but cannot see any place suitable for this information in the article. There is no section for "notable color blind people" though such sections exist for example for Prosopagnosia. I have put this information with reference (more details are in the online abstract) in Color blindness and occupations though this is not the ideal place. However the information is important since it shows that color blindness should not stop people for seeking to become artists if that is their talent.

wrong statistic values?

In the table "Prevalence of color blindness" there is an "overall value" of 0.49 to 1% although the difference races have far lower values? Is this a typo? — Preceding unsigned comment added by 217.231.103.179 (talk) 14:42, 23 April 2013 (UTC)

I suspect someone became confused between percentages and straight decimals. Given how the unweighted average of the male figures is a little below the lower bound of the "overall" stat, and the unweighted average of the female figures is a little below ONE HUNDREDTH of the same - and there's information in the bodytext suggesting the "total" is correct - I propose that the individual "by race" figures need to be multiplied by 100. IE increased from 0.0016 ~ 0.0064%, up to 0.16 ~ 0.64% (or 0.0016 ~ 0.0064 when expressed as a decimal).

With appropriate checks made at the source, of course - along with sensible sanity checks and second-sourcing if that still looks suspicious and badly proof-read.

Alternatively it could be that there's a component of the global female population that's neither caucasian, african or asian, and makes up a high enough proportion of the total with a high enough instance of colour blindness to skew the overall result... 193.63.174.211 (talk) 08:42, 3 May 2013 (UTC)

According to Question from pp253, b) iii) 8% male redgreen color blindness, gives 0,64% in females.

Question: iii. (If mating is at random and red-green color blindness (which is sex/X linked) does not affect survival or fertility, what should be the proportion of color-blind women in a population at (Hardy-Weinberg) equilibrium in which 8 per cent of the men are color blind?

Answer: iii. Because male's are haploid for the X chromosome, q = 0.08. Since females are diploid for the X chromosome, their rate of color blindness in this population would be q2 = 0.0064 or 0.64%

Same conclusion in on page 5, 7.2 THE HARDY-WEINBERG PRINCIPLE) subsection 3) : 8% in males, gives 0.0064 = 0.64% in females.

I'll change the article.--Vbakke (talk) 23:01, 3 July 2013 (UTC)

edit request - classification: by cause: dichromacy: protanopia

This bit is rather strangely written, to whit the middle sentence:

" It is a form of dichromatism in which red appears black and therefore human can see light only from 400 nm to 650 nm. "

I wonder if this was machine translated from another language maybe? :) ... It also doesn't give any hint about the relevance of the wavelength figures, as they have hardly been discussed at all in the text up to this point.

How about:

"It is a form of dichromatism in which the subject can only perceive light wavelengths from 400 to 650nm, instead of the usual 700nm. Pure reds cannot be seen, instead appearing black; purple colours cannot be distinguished from blues; more orange-tinted reds may appear as very dim yellows, and all orange-yellow-green shades of too long a wavelength to stimulate the blue receptors appear as a similar yellow hue."

Or similar? 193.63.174.211 (talk) 08:35, 3 May 2013 (UTC)

Done precisely as suggested. (I'm trusting you on the facts here, on the general principle that people who can write clearly usually can think clearly.) Looie496 (talk) 16:01, 3 May 2013 (UTC)

Rename article to "Color vision deficiency"

The article should really be renamed to "Color vision deficiency" and "Color blindness" redirect to it. As stated in the article it is more common to be deficient in color vision, but not lacking it! Therefore color blindness (not perceiving colors at all) is a special/maximum case of color vision deficiency. Using color blind for describing a condition with a broad range is a very unprecise top-level term, derogatory, and perpetuates ignorance.

Thanks for considering the renaming.

Rainbow diagrams

Could these diagrams be removed? They aren't at all correct. — Preceding unsigned comment added by 80.189.80.23 (talk) 18:51, 31 May 2013 (UTC)

What is wrong with them, and what should be the correct diagram?--Vbakke (talk) 11:16, 31 July 2013 (UTC)

A root of the problem is commons:File:Gay flag.svg, modified back and forth for several years, to be chosen as the base of all these *anopia images. Later I tried to start a discussion, but it was dumped to an archive and forgotten. When I tried to fix some previous mistakes I likely introduced my own ones, but was reluctant to fix further due to insufficient feedback. Of course, if one can repair all this disorder, it would be great. Incnis Mrsi (talk) 11:36, 31 July 2013 (UTC)

I don't know enough to determine whether the flags are right or wrong. A simple step would be to delete the images because they are WP:OR or WP:SYN. We don't have a source telling us what the images should look like. We do have sources telling us how the 1895 flags and Ishihara plates are perceived. If there is a source for transforming color coordinates for different symptoms, then there could be a WP:CALC argument, but I don't think that is made in the current article. Glrx (talk) 22:13, 31 July 2013 (UTC)

I agree. If we keep them, we need to tie them to the specifications that created them. A bit of original work is OK in creating illustrations, but only if the underlying data are reliably sourced, I think. Dicklyon (talk) 23:33, 31 July 2013 (UTC)

Colourblindness in WWII

During WWII people with colourblindness were used on occasion to detect camoflage - there are a number of webpages on the subject (but for technical reasons I cannot call them up at the moment). Jackiespeel (talk) 14:33, 4 July 2013 (UTC)

You likely speak about deuteranomaly – technically it is not a color blindness, and it is rather common condition. Can you make an article about it? Incnis Mrsi (talk) 11:36, 31 July 2013 (UTC)

Not so much to "detect" camouflage, but to look at black and white photos of camouflaged items, in which they could see much more detail than non-colourblind people. Old_Wombat (talk) 12:25, 4 September 2013 (UTC)

Could see much more detail at black and white photos? It is an utterly ignorant speculation. Incnis Mrsi (talk) 20:17, 5 September 2013 (UTC)

Uhh, I thought it was self-explanatory, but obviously not. My understanding is that most WWII photography was black and white. Those "not coolourblind" (which may well be deuteranomaly) could not distinguish what the camouflaged objects were in these black and white images - that is, against them, the camouflage was successful. But those who were "colourblind", were not "fooled" by the camouflage, and could see what the camouflaged objects were. Are you saying that none of this is true? Old_Wombat (talk) 10:50, 23 September 2013 (UTC)

Edit request on 9 August 2013

In the Further Reading section, please change McIntyre,D. John to McIntyre, Donald (this is the correct name; I've got the book) JimCaligari (talk) 21:11, 9 August 2013 (UTC)

Done. Glrx (talk) 22:15, 9 August 2013 (UTC)