instead of normal fish eyes who see with ocular lenses, grideyes have photosensitive bony membranes! technically there are three ipnops species, but they look pretty much the same, only separated by geography and depth (I. meadi and I. agasizzi are indo-pacific, I. murrayi are atlantic and carribean. I. meadi is found 3000-3500 meters, the other two are at 3000 and above). there is very little known about them, including why their eyes are like that. Interestingly, their larvae live at much higher depths and have actual eyeballs.