An eye without a solid lensSourced
Nautilus vision resembles a pinhole arrangement
Nautiluses have eyes without a solid lens, using a pinhole-like structure open to the environment. Their vision differs from that of many other cephalopods. Smell is thought to be a major sense for foraging and locating potential mates.
A shared animal group need not imply the same visual equipment.
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Nautilus · Wikimedia contributors
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Reviewed: 2026-10-05