For lack of a better term, I'm going to call RawZi's hypothesis the hunter-vision hypothesis or HVH for short.
According to Ayurveda, green, yellow or orange eyed people most often are what they call the constitution or dosha of Pitta (element=fire). They do best with soothing foods like raw meat and to stay away from spices and oils. I think they tend to be good hunters.
If colorblindness is indeed associated with super-hunter ancestry, then all those variables match me, interestingly (my eyes are greenish-brown, they were greener at birth and the rims seem to be gradually turning a bit greener and the brown centers getting lighter as I eat a raw carnivore diet).
They have good musculature
That doesn't match me, but I suspect that's because of generations of wheat-eating in a family of gluten sensitive people.
and can tend to not have extra fat on their bodies.
Yes, that's me if I don't eat plant foods.
Cats are obligate carnivores and so often I see cats with green eyes, sometimes yellow, sometimes orange.
Interesting, there's green eyes again among meat eaters.
Dogs are facultative carnivores. They almost always have brown eyes, except Siberian Huskies when have a blue eye.
I think you mean
domestic dogs almost always have brown eyes. If there's something to this stuff, then we should expect wild dogs to be less likely to have brown eyes and more likely to have one or more of blue, green, yellow or orange than domestic dogs. It's interesting that the breed of dog that's reportedly least changed from its wolf ancestors has blue eyes, an apparently more carnivorous color. I also wouldn't be surprised if huskies eat more meat, on avg, than more southerly breeds. It would make sense, given that Arctic people do.
I have thought of this before. Also the shape of the pupil in relation to diet.
Goats and deer have horizontal pupils. Cats have vertical. Humans and dogs have round.
Yet another physiological similarity between facultative carnivores and humans. Bears are facultative carnivores too. Do they have round eyes? Or perhaps one or more species of bears might even have vertical slits like cats, if their ancestors were more carnivorous? For example, like all bears, the giant panda is a facultative carnivore, and I remember reading that the giant panda is believed to have descended from even more physiologically carnivorous animals.
Cat eyes are made to detect motion in some ways more so than other animals' are.
I wonder if colorblind human vision is also better at detecting motion than color-enhanced vision, and whether people with green or blue eyes are better at detecting motion than people with brown eyes? I know, I'm speculating wildly here--it's called brainstorming. Let's focus on generating ideas and data for now and save the critiquing for later, please. Thanks.
Maybe if the color-blindness tendency is also on the same gene as the needing-to-be-mostly-carnivorous tendency. Otherwise, I doubt it.
I don't think they'd have to be on the same gene, just two genes associated with each other within a population (assuming it's real, then whether it would be the entire human race or a smaller population, I don't know).
From the hunter-vision model, since color vision wouldn't seem to provide even less hunting advantage in the Arctic than the dry African savannah, we might predict that people whose ancestors have lived in the Arctic for many generations might have a very slightly higher rate of color blindness than other people. Given that meat eating seems to be associated with green and blue eye colors, we should expect some green and blue-eyed people among many or all of the meat-heavy Arctic peoples, even some of the darker haired folk. We should also expect their eyes to change to darker and browner as they eat more modern foods and less meat/fat/organs/eggs.
I need to get some sleep, so no time to investigate this further now, but maybe I'll have more time tomorrow night. If anyone else can add more info or ideas in the meantime, that would be great. RawZi seems to be on to something here and I definetely think it's worth investigating. This is the sort of creative science and connection-making I enjoy. I want to focus on brainstorming and data-gathering in this early stage. We can do the critiquing later.
In a group of HGs it was perhaps not necessarily a disandvantage. On the contrary since hunting involved usually a group of people, in some specific situations the ability of bichromatic people to perceive camouflage nuances that most of the trichromatic hunters could no see confers a collective advantage to the group. ....
Correct and that's the gist of the HVH.
Yes sure. I was never a vegan or a vegetarian victim so these words are not linked to any particular emotion in my mind 
I don't recommend living in a vegetarian/vegan-rules household or visiting vegetarian/vegan-oriented forums. The propaganda, nastiness and complaints about health problems (usually attributed to "detox") can get pretty bad.
Topic: Does color blindness suggest a hunter past? (Read 22814 times)