Which structure transmits visual information from the retina to the brain?

• A. Retinal pigment epithelium
• B. Vitreous
• C. Aqueous
• D. Optic nerve

Answer: (D)

Visual information travels from the retina to the brain via the optic nerve. After light is detected by photoreceptors, the resulting electrical signals are relayed through retinal neurons whose axons gather to form the optic nerve. This nerve carries those signals from the eye toward the brain, ultimately reaching the thalamus and visual cortex for processing. The retinal pigment epithelium supports photoreceptors, while the vitreous humor and aqueous humor are fluids that fill parts of the eye and help with shape and light transmission rather than conveying neural signals. So, the optic nerve is the structure responsible for transmitting visual information to the brain.