Fish see in the dark thanks to extra layers of rod cells in their eyes 
By Robert Barrie US Source: newscientist 12/21/2022
Robert Barrie
Credit: Justin Marshall
The specialised retinas of some nocturnal coral fish result in faster vision and greater sensitivity to dim and bright light. The same adaptation may enable deep-sea animals to see in darkness.
 

Fish living in dim conditions can have as many as 28 layers of light-sensitive rod cells at the back of their eyes, known as a multibank retina. But exactly how this helps them to see in low light was unclear until now.

 
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