At first I thought this was some kind of hoax..I initially thought the stuff in the head was a reflection of fishes but it’s actually see-thru. wow! creepy but amazing! here are some excepts from the article and a video…
For 50 years boffins have been baffled as to how the strange looking fish coped with eyes giving it tunnel vision of whatever was directly above its head.But now they know the Barreleye Fish (or Macropinna microstoma, if you want to get all technical) can rotate its odd eyes within a transparent shield that covers the fish’s head.