In short, their vision is something we can't quite even imagine. These phenomena aren't a result of multiple pupils, but rather because of a larger number of photoreceptors - twelve instead of the three that humans have. Not to mention that they see in the infrared and ultraviolet range and discern polarized light in ways that we can't. Mantis Shrimp have trinocular vision giving them better depth perceptions than humans using only a single eye. Humans have binocular vision - we perceived depth by focussing two pupils on the same point. They have the best eyes in the animal kingdom, with not two, but three pupils in each eye. Your alien is related to the mantis shrimp. If, on the other hand, you're just thinking about human eyes with two holes. So, if the eye is a two-chambered retina and the muscles of the eye are designed to manipulate two pupils, we have an ultra-cool solution with an amazingly high geek factor. Or, if you really color outside the lines, the second chamber might heighten contrast, or heighten saturation, or some other Photoshoppy effect that would give them an advantage over just seeing plain old color. The second chamber would be more acute than simply shading a single chamber. On the other hand, a second chamber would be useful for full-spectrum sight (or, perhaps, "normal" spectrum sight) if you're in a binary star system and one of those honkers is really, really, really bright. In other words, if you add cones to detect infrared light, that would NOT justify two chambers.
This would only make evolutionary sense if what was coming through the pupil couldn't be dealt with by the construction of the retina. If you have a two-chambered retina, it would allow you to receive something different in one compared to the other. Two holes instead of one means the area between the two holes isn't being controlled as expected, and the result is poor light control on the retina.īut, if the eye is designed for something non-human (like a goat, frog, cat, or.) like two holes, then there could be some benefits. The muscles around the pupil are designed to dilate and contract the pupil, regulating the amount of light impacting on the retina.From the perspective of a human, the results are bad.
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