Octopus vision

Octopus vision is very complex. Unlike a human, they focus by moving their lens instead of changing its shape. Scientist believed the octopus were color blind because they only have one photoreceptor (humans have three — one for every base color). But new studies suggest they are capable of seeing color with their uniquely shaped pupils that can separate light into the base component wavelengths of red, blue, and green (like a prism). Learn more about octopus vision.