The eye is one of our most important sensory organs for orienting ourselves in our environment. In its structure and functioning, the eye can be compared to a camera lens: Light rays pass through the transparent surface of the eye - the cornea - through the pupil.

The size of the pupil, and thus the amount of incident light, is regulated by the iris. The incident light rays are then bundled by the lens behind it and projected onto the retina. There, the light is converted into nerve impulses that are transmitted from the optic nerve to the brain. By combining the images of both eyes, we are able to see spatially.