Video narration
How can a small organ turn light into the world you see? Think of your eye as a smartphone camera: it lets in and focuses light, then turns it into information. Light first passes through the cornea, the clear front surface that begins focusing it. It then passes through the pupil, the opening that lets light in. The iris adjusts that opening, making it larger or smaller. Next, the lens bends light toward the back of the eye and focuses it. There, the retina, a light-sensitive layer, converts light into nerve signals. Here's the surprising part: the eye does not see by itself. The optic nerve carries those signals to the brain, where they are interpreted as vision. So how does this organ create what you see? It focuses light, converts it into nerve signals, and sends them to the brain, which creates your vision.