In the front of your eye, covering the iris (the colored part) and the pupil (the little black part,) is your cornea. This is where light enters your eyes. Your cornea is curved so as to “bend” the light, so it can pass through the pupil.
The pupil is increased or decreased in size by the iris, in order to let in just the right amount of light. Once past the pupil, the light rays enter a clear lens where the light is focused and displayed onto the retina at the very back of your eye.
Your retina is a sensitive tissue that contains cells which convert light rays into electrical impulses that travel to your brain through your optic nerve. The image arrives upside down because the “bend” in the light flipped the image 180 degrees. But when your brain receives the impulses, it flips the image right side up.
This entire intricate process happens in only 13 milliseconds, a fraction of the 300-400 milliseconds it takes you to blink. So, you SEE, you are Fearfully and Wonderfully made!
-By Steven McFie