A scalloped hammerhead shark, one of the species given sight tests.Photograph: Stephen Frink/Corbis
From The Guardian:
The wing-like heads of hammerhead sharks with their widely spaced eyes give the creatures excellent binocular vision.
The bizarre appearance of hammerhead sharks has led generations of marine biologists to ponder the same question: why the wide face?
Part of the answer may now be at hand. Eye tests on species caught off the coasts of Florida and Hawaii show that the wider the head the better the shark's binocular vision, and hence its perception of distance.
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