Can you believe we inspired a horror movie?!

Blind Cave Tetras
Blind Cave Tetras
Blind Cave Tetras

In the movie 47 Meters Down Uncaged, the protagonists encounter some Great White Sharks that have become blind due to living without light.
While exaggerated for the movie, this adaptation has actually happened.
Our Blind Cave Tetras are a real world example of this.  
They have become blind and their eyes are covered due to living in caves with no light, therefore having no use to see anything.

 

Blind Cave Tetras