Vision is the most important sense to the human body, we need it more than any other sense in our day to day lives, and it is key to our survival. Vision works by converting light signals into images in the brain. This works by light passing through to the cornea, where the light is bent and focused so that it can pass through. Then the light goes through to the retina where photoreceptors convert the information into electrical impulses for the brain to understand. The brain then creates the image for us to see.