The light-sensitive inner surface of the eye containing the receptor rods and cones plus layers of neurons that begin processing visual information describes which structure?

• A. Iris
• B. Retina
• C. Sclera
• D. Cornea

Answer: (B)

The retina is the light-sensitive inner surface of the eye that contains the receptor rods and cones and the layers of neurons that begin processing visual information. Photoreceptors in the retina detect light and convert it into electrical signals, with rods handling brightness and motion and cones handling color and detail. These signals pass through intermediate retinal neurons, like bipolar and ganglion cells, starting the initial processing right there before traveling via the optic nerve to the brain. The other structures serve different roles: the iris regulates pupil size, the sclera forms the eye’s outer protective layer, and the cornea is the transparent front surface that helps focus light.