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What are possible ways of underground humanoids developing eyes?

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I'm thinking about underground humanoid cvilisation without knowledge about outside world and how could they have eyes?

Known fact is that a lot of animal living in dark don't need eyes. (cave or deep ocean animals)

Maybe we could consider red vision, but how and why should they develop it? What about underground light sources? Hot melting metals? What other light source could be considered?

I see how developed civilisation can survieve underground, but how can it grow and as the question here - how could they develop eyes in the evolution process?

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This post was sourced from https://worldbuilding.stackexchange.com/q/157075. It is licensed under CC BY-SA 4.0.

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