The fish with eyes inside its transparent head

Those two dots on this fish’s face aren’t its eyes. They’re its nostrils.

Its real eyes are the green tubes inside its transparent head.

A barreleye’s transparent head and green tubular eyes in original deep-sea footage — MBARI. Original ROV footage; documentary excerpt/frame. Original watermark retained.

The barreleye’s eyes can rotate inside a transparent, fluid-filled shield.

They point upward to spot prey overhead, then turn forward when the fish feeds.

A close view of the eyes inside the barreleye’s transparent shield — MBARI. Original ROV footage; documentary excerpt/frame. Original watermark retained.

For decades, illustrations missed the transparent dome: it was usually destroyed when the fish was caught in nets.

Deep-sea cameras finally let researchers see the animal intact.

The whole barreleye swimming in its natural deep-sea habitat — MBARI. Original ROV footage; documentary excerpt/frame. Original watermark retained.

Those two dots on this fish’s face aren’t its eyes. They’re its nostrils.

Its real eyes are the green tubes inside its transparent head.
The barreleye’s eyes can rotate inside a transparent, fluid-filled shield.

They point upward to spot prey overhead, then turn forward when the fish feeds.
For decades, illustrations missed the transparent dome: it was usually destroyed when the fish was caught in nets.

Deep-sea cameras finally let researchers see the animal intact.

The fish with eyes inside its transparent head

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