>>723496326
And then there's this guy.
>The eyes of the mantis shrimp are mounted on mobile stalks and can move independently of each other. The extreme mobility allows them to be rotated in all three dimensions, yet the position of their eyes has shown to have little effect on the perception of their surroundings. Mantis shrimp are thought to have the most complex eyes in the animal kingdom and the most complex front-end for any visual system ever discovered.
>Each compound eye is made up of tens of thousands of ommatidia, clusters of photoreceptor cells. Each eye consists of two flattened hemispheres separated by parallel rows of specialised ommatidia, collectively called the midband. The number of omatidial rows in the midband ranges from two to six. This divides the eye into three regions. This configuration enables mantis shrimp to see objects that are near the mid-plane of an eye with three parts of the same eye (as can be seen in some photos showing three pseudopupils in one eye). In other words, each eye possesses trinocular vision, and therefore depth perception, for objects near its mid-plane. The upper and lower hemispheres are used primarily for recognition of form and motion, like the eyes of many other crustaceans.