Deep-sea fish with a transparent head called Macropinna microstoma.
Through the transparent shell, it looks for its tubular eyes.
Transparent head protects the eyes through which the fish watching for prey.
First opened in 1939. It lives at a much greater depth, therefore not fully been studied. In particular, it is not quite clear was the principle of the fish. I believe that it should feel very great difficulties due to the fact that it can only look up.
Only in 2009 was fully investigated the structure of the eye of the fish. Apparently when trying to study it before the fish just could not stand the pressure change.