Which layer is the inner nervous retina responsible for vision?

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

Answer: (D)

Vision begins in the retina, the inner nervous layer of the eye. This tissue houses the photoreceptors—rods and cones—that detect light and convert it into electrical signals. Those signals are then passed through other retinal neurons for processing before traveling to the brain via the optic nerve, forming what we perceive as vision. The cornea is the transparent front surface that first refracts light, the sclera is the tough outer white coat, and the choroid is the vascular layer that nourishes the eye. Since the retina contains the light-detecting cells and the neural circuitry that creates visual signals, it is responsible for vision.