What is the retina?

What is the retina?

• A. The light-sensitive inner surface of the eye, containing the receptor rods and cones plus layers of neurons that begin the processing of visual information
• B. The sclera
• C. The cornea
• D. The optic nerve

Answer: (A)

The retina is the light-sensitive inner surface of the eye, containing the receptor rods and cones along with the layers of neurons that begin the processing of visual information. It sits at the back of the eye and converts light into electrical signals through photoreceptors: rods, which are very good in dim light and provide vision without color, and cones, which detect color and fine detail in brighter light. These signals move through intermediate neurons—bipolar, horizontal, and amacrine cells—before reaching ganglion cells, whose axons form the optic nerve that carries information to the brain for interpretation. The sclera is the tough white outer layer, the cornea is the transparent front surface that helps focus light, and the optic nerve is the bundle that transmits signals to the brain, not the retina itself.

The retina is the light-sensitive inner surface of the eye, containing the receptor rods and cones along with the layers of neurons that begin the processing of visual information. It sits at the back of the eye and converts light into electrical signals through photoreceptors: rods, which are very good in dim light and provide vision without color, and cones, which detect color and fine detail in brighter light. These signals move through intermediate neurons—bipolar, horizontal, and amacrine cells—before reaching ganglion cells, whose axons form the optic nerve that carries information to the brain for interpretation. The sclera is the tough white outer layer, the cornea is the transparent front surface that helps focus light, and the optic nerve is the bundle that transmits signals to the brain, not the retina itself.