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Anonymous
>Box jellyfish actively hunt their preyto achieve this they move extremely quickly (at speeds up to 3 to 3.5 knots (1.5 to 1.8 m/s)) instead of drifting as do true jellyfish. They are known to be the only jellyfish with an active visual system, consisting of 24 eyes located on the center of each side of its bell.
>The eyes occur in clusters on the four sides of the cube-like body. Sixteen are simply pits of light-sensitive pigment (eight slit-shaped eyes and eight lens-less pit eyes), but one pair in each cluster is surprisingly complex, with a sophisticated lens, retina, iris and cornea, all in an eye only 0.1 millimeters across.
>The lenses on these eyes have been analyzed and could form distortion free images. Despite the perfection of the lenses, the retinas of the eyes lie closer to the lens than the optimum focal distance, resulting in a blurred image. One of these eyes in each set has an iris that contracts in bright light. Four of the eyes can only make out simple light levels.
>It is not currently known how this visual information is processed by Cubozoa, as they lack a central nervous system, although they seem to have four brain-like organs.[5] Some scientists have proposed that jellies have a nerve net that would allow the processing of visual cues.
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