What is the primary function of the optic nerve?

The primary function of the optic nerve is to transmit visual information from the retina, where light is detected, to the brain for processing. This includes carrying signals generated by photoreceptor cells in the retina (rods and cones) that respond to light and color. Once the brain receives this information, it can interpret what the eyes perceive, allowing for vision. The optic nerve is crucial in transforming visual stimuli into signals that the brain can understand, making it essential for the sense of sight.

Other functions related to eye movement, pressure regulation, and maintaining the shape of the eye are performed by different structures and pathways within the eye. For example, the muscles around the eye control movement, while intraocular pressure is regulated by the trabecular meshwork and aqueous humor dynamics. The sclera and other tissues provide shape and structural integrity to the eye. However, the specific role of transmitting visual information is solely associated with the optic nerve, affirming why this answer is correct.