I’ve always wondered how eyes evolved.
You need an optic nerve to transmit the info to the brain, but why would we evolve eyes without that, or an optic nerve without eyes. What purpose would it serve?
Maybe a random mutation led to eyes that were useless till then a nerve evolved like a million years later?
Or they both happened at the same time over a million years or so?
In: Biology
IIRC, the most primitive eye was basically a photo receptive nerve bundle, so I guess the answer is both. It’s not like an eyeball or nerve evolved in place without the other and then the other evolved to complete the system.
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