Researchers Discover First Vertebrate with Eyes that Use Mirrors Rather than Lenses

An international research team has discovered the first vertebrate with eyes that use mirrors rather than lenses to focus light. The spookfish, Dolichopteryx longipes, manages to focus light in the lower eye without using a lens. Light enters the lower portion of the eye and hits a mirror composed of stacks of crystals. This is the first time that this type of focusing mechanism has ever been found in a vertebrate.

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