Question: the fovea has the highest density of photoreceptors?
Answer: The fovea contains the highest density of cone photoreceptors in the retina (199,000/mm2); the numbers drop to about 50% (100,000/mm2) by 500 μm (c. 1.75 deg) from the fovea centre and to less than 5% (<10,000/mm2) at about 4 mm (c. 20 deg) eccentricity (Curcio et al., 1991).