Question

The human retina has an area of about 1000 mm^2. If we have a total of 125 million rods and 6.5 million cones in each eye, show that we have about 131,500 sensory cells per square millimeter in the retina.

Answer 1

Since the number of transducers, rods and cones, become less as you approach the periphery of the eye, with the fovea having the greatest density of cells, I would not know how to do it. However,

(125,000,000 + 6,500,000)/1000 = 125,000 + 6,500 = 131,500