Question

The sensation of vision on the retina is carried to the brain by

• A. ciliary muscle
• B. cornea
• C. optic nerves
• D. iris

Answer 1

The Correct Option is C

The retina contains photoreceptor cells (rods and cones) that detect light and convert it into electrical signals. These signals are then transmitted to the brain for processing. The structure responsible for carrying these signals from the retina to the brain is the optic nerve. The optic nerve is a bundle of nerve fibers that exits the eye at the optic disc and connects to the visual cortex in the brain, enabling the perception of vision.

Other options can be ruled out as follows:

• Ciliary muscle: This controls the shape of the lens to help focus light onto the retina but does not transmit visual signals.
• Cornea: This is the transparent outer layer of the eye that helps refract light but does not carry signals to the brain.
• Iris: This regulates the amount of light entering the eye by adjusting the pupil size and is not involved in signal transmission.

Final Answer: The correct answer is \( \mathbf{\text{optic nerves}} \), which corresponds to option \( \mathbf{(3)} \).