Bird retinas work without oxygen, and now scientists know how

The light-sensitive tissue of birds’ eyes is not supplied with oxygen by blood vessels – instead, it powers itself with a flood of sugar, and this may have evolutionary benefits

SINSIN
Jan 21, 2026 - 22:00
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Bird retinas work without oxygen, and now scientists know how
The light-sensitive tissue of birds’ eyes is not supplied with oxygen by blood vessels – instead, it powers itself with a flood of sugar, and this may have evolutionary benefits

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