What sensory function is provided by the optic nerve?

The optic nerve is primarily responsible for transmitting visual information from the retina in the eye to the brain. It carries neural signals that originate from photoreceptor cells within the retina, which detect light and convert it into electrical impulses. These impulses then travel along the optic nerve, where they are processed in the visual cortex of the brain, allowing us to perceive images and visual stimuli.

In contrast, the other options refer to different sensory modalities. Equilibrium pertains to our sense of balance and spatial orientation, which is managed by the vestibular system. Touch is associated with the somatosensory system that detects pressure, vibration, and temperature through skin receptors. Sound perception is facilitated by the auditory pathway, which involves the cochlea and auditory nerve. Therefore, the optic nerve's specific role in vision is what makes it the correct answer in this context.