What is the function of the optic nerve?

The optic nerve plays a crucial role in visual processing by serving as the pathway that connects the eye to the brain. It transmits visual information from the retina, where light is converted into electrical signals, directly to the visual cortex in the brain. This is essential for interpreting what we see, as the brain relies on these signals for vision. Without the optic nerve, the information captured by the eyes would not reach the brain for interpretation, thus hindering our ability to perceive visual stimuli.

In contrast, the other options relate to functions that are not associated with the optic nerve. Producing tears is a function of the lacrimal glands, filtering light involves the cornea and lens, and focusing images is primarily the work of the eye's refractive components. Therefore, the optic nerve’s primary function is accurately described as connecting the eye to the brain for visual communication.