All language subtitles for Vision

The process of seeing begins when light waves enter the front of the eye.

Brightness and distinct colors are first interpreted by structures in the back of the eye,

and then sent as stimulus signals that the brain interprets as vision.

On the exterior of the eye is an area called the cornea,

that includes a pupil, a hole through which light enters the eye.

Inside the eye, light is refracted by a lens

and focused onto the retina, a layer of receptors that lines the inside of the eye.

The retina includes two types of nervous system cells:

cones that interpret color of light waves,

and rods that interpret the intensity of light.

These photoreceptors process information into nerve signals that travel through the optic nerve

into the occipital lobe of the brain, where signals are interpreted to represent an image.