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Urwumpe is right, remember the Giant squids (officially observed for a few years)? They're living in quite deep sea, at least 500 meters and have eyes. And fabulous eyes, bigger than your palm.
And there are signs for even larger squids, collossal squids who live even deeper. You would find giant eyes on them, too.
There is also a reason why animals thousands of meters below the surface developed the ability to emit light signals - if nobody would see it, why should they do it?