Can box jellyfish see with their eyes?
This article from Live Science provides some insight (no pun intended) into box jellyfish eyes.
“Whereas we have one set of multi-purpose eyes that sense color, size, shape and light intensity, box jellyfish have four different types of special-purpose eyes. The most primitive set detects only light levels, but one set of eyes is more sophisticated and can detect the color and size of objects.”
This article from Science Daily may also help.
“The researchers examined the function of one of two types of &quot;upper lens eyes,&quot; already known to form images, to work out just what those eyes can see and how well. It turns out that those four eyes cover precisely the visual field needed to see through the water's surface up into the world above.”