Sometimes they just turn real red and I can see the nerves but at other times I cannot. Why does this happen?
In: Biology
your eyes are filled with a lot of tiny veins (capilaries). they are almost invisible most of the time. But when your eyes are irritated, when you consume a vasodilator (a molecule that makes your sphincters open) molecule or when you are forcing the focus on something “hard” to focus on, your eyes needs/have more blood, making your veins bigger and you can see them.
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