How does the eye work?
As the eye's main focusing element, the cornea takes wide rays of light and bends them through the pupil (the dark, round opening in the center of the coloured iris). The very back of the eye is lined with a layer called the retina, which acts like the film of a camera. The retina is a membrane containing photoreceptor nerve cells that lines the inside back wall of the eye. The photoreceptor nerve cells of the retina change the light rays into electrical impulses and send them through the optic nerve to the brain, where an image is perceived.
The pupil dilates and shrinks in order to determine how much light enters the eye. This light then travels to the cornea, which focuses the light upon the lens. The lens further focuses the light on the retina, and the image is flipped over and spread across the back of the retina. The photoreceptor nerve cells of the retina change the light rays into electrical impulses and send them through the optic nerve to the brain, where an image is perceived.
The pupil dilates and shrinks in order to determine how much light enters the eye. This light then travels to the cornea, which focuses the light upon the lens. The lens further focuses the light on the retina, and the image is flipped over and spread across the back of the retina. The photoreceptor nerve cells of the retina change the light rays into electrical impulses and send them through the optic nerve to the brain, where an image is perceived.