An octopus has two eyes, which have a very similar structure to human eyes. An octopus' eye contains a retina, cornea, iris and lens, which provide the octopus with excellent vision, especially for an invertebrate.
Octopuses have the ability to rotate their eyes, which means they have no blind spot, unlike humans and many other animals. In fact, they can align their vision horizontally, regardless of the angle of their body.
In addition, octopus also have polarized vision, which allows them to see better through water and spot jellyfish and other prey. While they have excellent vision close up, they are nearsighted, as their vision range only extends to around 8 feet.