Talk:Dichromacy

I've removed a claim that cats, and crepuscular carnivores in general, tend to be trichromatic. I can find no evidence to support this, and a good deal that suggests that it's wrong, unless the trichromacy results from rod action. If anyone wants to reinsert the claim, I think that it should be supported with a clear reference. seglea 22:16, 12 May 2005 (UTC)

Genetics

Both the dichromacyarticle and the general color blindness article are lacking when it comes to the genetics behind it. Is the gene recessive or dominant? Is it autosomal or X-linked? How is it inherited, and what is the prognosis for passing color blindness on to the next generation. All this information should be mandatory in all genetically linked diseases.

madskile Madskile 06:12, 8 March 2007 (UTC)

I don't understand this article. Can someone simplify?

I looked up this article after learning that bulls can't see red because cattle are dichromatic. (I think that was the word.) Basically, I want to know what a dichromatic animal can see. I understand they can see hundreds of variations of color, but how is their sight different from normal sight? Could someone explain that and simplify this article? Much obliged. DBlomgren (talk) 22:50, 13 April 2014 (UTC)

Spectral sensitivity needed

In the case of non-primate mammals, a plot of their spectral sensitivity curves is needed (such as the Tetrachromacy page has). — Preceding unsigned comment added by 2602:306:CD54:C180:20C:6EFF:FECE:F7B4 (talk) 23:40, 18 June 2014 (UTC)

It appears that most papers on dichromats present data in the form of the flicker photometric relative sensitivities. Getting to actual spectral sensitivity curves is harder. But they tend to be roughly one short-wavelength cone and one medium- or long-wavelength cone, in most species. Dicklyon (talk) 05:09, 19 June 2014 (UTC)

Long wavelengths

The "Other Animals" section suggests that dichromats lack the ability to "see long wavelengths" of light. But, if that was true, then cats and dogs would be unable to see the red dot of a laser pointer. In fact, the sensitivity of our "green" cones and our "red" cones to different wavelengths of light almost-but-not-quite-completely overlap. When we see a laser dot as pure "red," it's not because it doesn't stimulate our green cones. It _does_ stimulate them, but it causes a greater response in the "red" cones. It's the _ratio_ of the different responses that determines how we perceive the color. 173.75.33.51 (talk) 12:10, 17 June 2020 (UTC)