Human eye (cornea, iris, pupil, lens, retina, optic nerve), then draw two ray diagrams

Why your eyes are actually projectors

Most people think the lens inside their eye does all the heavy lifting to focus what they see. But that's a complete myth.

Your eye is a living camera, and the real hero is the cornea—the clear dome at the front. It bends incoming light so sharply that it handles 70 percent of your focusing power. The iris simply controls the lighting, and that famous lens? It merely fine-tunes the last 30 percent, projecting the image perfectly onto the retina.

That retina is a biological sensor packed with 125 million rods for night vision, and 6 million cones for color. It captures the light, but how your brain processes this upside-down projection is where things get truly strange.