Way 1 — Simple steps: Light comes into your eye through a little hole called the pupil. It goes through a tiny lens that helps make the picture. The back of your eye, called the retina, catches the picture but it is upside down. The eye sends the picture to the brain, and the brain turns it the right way up so you can see correctly.
Way 2 — Like a camera: Imagine your eye is a camera. Light enters through the pupil (the camera hole) and the lens focuses the picture. The retina is like the camera film that gets the picture upside down. Then your brain is like a helper that flips the picture right-side-up so you know what you are looking at.