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this post was submitted on 02 Jun 2024
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And humans usually have three, but sometimes it's two, and even rarely 4...
With that much variations (including other ways) it's hard to say human eyes are optimized for any condition.
There are very few examples of things in nature that are truly optimized for all of its environment.
Humans are just too widespread with too much variation to say we're optimized for anything.
We just have too much in species variation.
We actually have less genetic variation than most animals. There was a lot of bottlenecking in the paleolithic. And what little we do have is still mostly confined to Africa, because the rest or the world shared common ancestry as we left our original continent.
Like, 1 in 200 people is colourblind, or something? I don't think that's a reasonable argument that we're not trichromats.
You're talking genetic variation, I'm talking phenotype variation...
....
Again, you're talking genetics, where it is clearly broken down in 2,3,4.
However like pretty much everything else, it's not that clear cut just because the plans were.
Two people with the same amount of different types of cones are not guaranteed to have the same rod/cone ratio. Even when they have similar genetics for the ratio, things rarely go according to plan as a human develops.
Like, you know that's why facial symmetry is attractive right? It shows that things on both halves went according to plan. Which especially for women is a huge bonus for reproductive health.
Especially for something made up of a whole bunch of small things like rods/cones, it's not even perfect for identical twins.