Zoologist Dan-Erik Nilsson demonstrates how the complex human eye could have evolved from simple light-sensitive cells. From a PBS show called "Evolution: Darwin's Dangerous Idea." Includes background reading material and discussion...

The story of a woman who lost her vision after a stroke. Her primary visual cortex was severely damaged. But then she began to see rain and other moving water. [3:34]

Describes the important structures of the human eye and how they work so that we can see images. [4:47]

This video looks at the sense of sight and how light hits the photoreceptors in the eye, communicates with the brain, and translates the information into images we can see.