The image formed by the cornea is upside down and reversed from right to left. A human's cornea can't change its shape in order to bring objects into focus, but fortunately, one part of our eye CAN change shape. In order to help us focus on close objects, the LENS of our eye changes shape. This is called accommodation . Tiny fibers called ligaments and muscles change the shape of the lens, making it thinner to focus on far objects or thicker to focus on near objects.
Eagles can change the shape of their lens, and can also change the shape of their corneas.
This allows them more precise focusing and accommodation than we humans can get. Every single thing we see is projected, upside down and backward, on our retina, onto special cells called rods and cones . Each microscopic cone cell is connected to a nerve that goes straight to the brain. When a tiny particle of light from an object hits a particular cone, the brain instantly sees it as a particle of color. All the cones together work like the tiny dots on your computer screen.