Ganglion Cells
Ganglion cells are neurons located in the retina that receive visual signals from photoreceptors, such as rods and cones, via interneurons. The axons of these cells then converge and exit the back of the eye to form the optic nerve.
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Optic Nerve
In the light-sensitive tissue at the back of the eye, light must pass through several layers of transparent neurons before it reaches the actual light-detecting cells. The long fibers (axons) from one of these neuron layers must then bundle together and exit the eye to carry signals to the brain. What is a direct structural consequence of this 'front-wired' design?