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How Vision Works

Light passes through the outer portion of the eye called the cornea. The cornea starts to focus the light and it passes through the black spot in the center of the eye called the pupil. The pupil changes size to allow more or less light in depending on the environment. On a bright sunny day the pupils will shrink in size, while in a dark, dimly-lit room the pupils will dilate to let in as much light as possible.

The light then passes through the lens which further focuses it on the back of the eye called the retina. The lens changes shape depending on whether we are looking at objects up close or far away in the distance.

The retina is a special membrane along the inside of the eye that contains specialized cells called photoreceptors. When light reaches these photoreceptor cells, they release signals that are carried along the optic nerve and delivered to the brain. The brain then translates these messages into the images that we see. Vision is a very complex process that relies on the intricate parts of the eye working together with each other and the brain.