Which nerve transmits visual signals from the eye to the brain?

Which nerve transmits visual signals from the eye to the brain?

• A. Iris
• B. Retina
• C. Optic nerve
• D. Lens

Answer: (C)

The optic nerve is the pathway that carries visual signals from the eye to the brain. In the retina, light is detected by photoreceptors (rods and cones) and converted into electrical impulses. These impulses travel along nerve fibers that bundle together to form the optic nerve, which carries them into the brain where they are processed into the images we see. The iris controls how much light enters by changing pupil size, and the lens focuses light onto the retina, but their roles are about light entry and focusing, not transmitting signals.

The optic nerve is the pathway that carries visual signals from the eye to the brain. In the retina, light is detected by photoreceptors (rods and cones) and converted into electrical impulses. These impulses travel along nerve fibers that bundle together to form the optic nerve, which carries them into the brain where they are processed into the images we see. The iris controls how much light enters by changing pupil size, and the lens focuses light onto the retina, but their roles are about light entry and focusing, not transmitting signals.