Submitted by TheSonOfKayra t3_125nk1x in askscience
Riptide360 t1_je5exgw wrote
Your species relationship with food dictates a lot about how your eyes evolved.
In many land animals who eat primarily with their faces in their food they have an inner eye lid tied to the jaw muscle that closes during eating to keep food debris out. You can see the vestige of ours in the pink muscle stub in the inner corner of your eye and compare it to the full version found in your dog, cat or bird.
The placement of your eyes is also related to what you eat. Herbivore animals often have horizontal pupils, their day predator animals often have circular pupils and their night predator animals will frequently have vertical pupils. https://physicsworld.com/a/eye-shape-reveals-whether-animal-is-predator-or-prey/
In humans our ability to see in color was in part due to our evolution with gauging the effort to eat ripe fruit. This also improved our fore arms as more than legs and improved our hand eye coordination and thumb evolution.
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