Once we do know about these, it's not as if light sensitive materials are particularly unusual or hard to synthesise in nature.
One mistake is to consider that the first light sensitive patches were sensitive to what we regard as visible light. Instead we should consider that you are looking for an
energy sensitive patch of skin.
Now when I go outside I can tell - without using my eyes - whether I am in sunshine or shade, because I can feel the heat on my skin. It is also not difficult to see that cells react to energy, with input from one side being different from the other side: there are many many many single cell life forms, animal, protist or plant, that sense and react to the presence of sunshine, and thus the whole organism is an energy sensitive patch.
Molecules react to energy flow, and thus the ability to "sense" the source of energy is just a difference in behavior of molecules.
Mutation and selection from that point makes the ability to use wavelengths that have the ability to provide a finer image will evolve as the development of the eye patch into a cup etc selects for the need for finer focus.
This also explains how such patches can evolve independently many times for many different applications. It's simple molecular biology.
Enjoy.
we are limited in our ability to understand
by our ability to understand
Rebel American Zen Deist
... to learn ... to think ... to live ... to laugh ...
to share.
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