Eyes evolved to be most receptive to things of interest.
Things in nature that are green are very interesting. For example, plants. It's probably important to be able to focus on those, especially if you're arboreal.
Things in nature that are yellow or red are also interesting. For example, fruits, blood, and poisonous things.
Things in nature that are blue are much less common. By far, the most prevalent blue thing we encounter is the sky, and that isn't something that we need to focus on.
ozyx7 t1_j7oeneq wrote
Reply to comment by WillTFB in TIL the first Blue LED wasn't commercially available until 1989 and bright blue LEDs weren't available until 1993. by j-merc23
Eyes evolved to be most receptive to things of interest.
Things in nature that are green are very interesting. For example, plants. It's probably important to be able to focus on those, especially if you're arboreal.
Things in nature that are yellow or red are also interesting. For example, fruits, blood, and poisonous things.
Things in nature that are blue are much less common. By far, the most prevalent blue thing we encounter is the sky, and that isn't something that we need to focus on.