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I was about to post a link about the fact that our retinas themselves can't sense colors in our peripheral vision.

But apparently that's been debunked!

https://www.aop.org.uk/ot/science-and-vision/research/2015/1...

Back in high school a teacher told us this "fact" as well and I remember being very surprised because it did not match my experience at all. Many times have I tested this theory since, e.g. when waiting at a pedestrian traffic light, looking off to the side so that the light is on the very edge of my peripheral vision, seeing if I can perceive it turn green and always being able to. Of course this is not proof that there are no people who can't do this, but I definitely know that I can see color at the edge of my peripheral vision and I've come to assume that this just varies from person to person.

Maybe it's my red/green color blindness that's playing a role.

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