Cranial Nerve II, also known as the optic nerve, is responsible for transmitting visual information from the retina in the eye to the brain. It plays a crucial role in vision by carrying signals related to light and images, allowing us to perceive our surroundings. This nerve is composed of sensory fibers and is essential for sight. Damage to the optic nerve can lead to vision loss or impairment, highlighting its importance in the visual pathway. The optic chiasm, where the nerve fibers partially cross, is a key structure in the visual processing system.