"The development of this strange molluscan eye has gone even further in the highly mobile squid. All the oceanic squids have a complex eye with an iris, a variable-focus lens, and a retina with enough sensitive cells to make their color and pattern discrimination every bit as good as our own. Squid see as well as, if not better than, any other animals alive--or at least, their eyes have the capacity for doing so. This is uncanny, but what really worries me is what they do with so much information."
Lyall Watson, Gift of Unknown Things.