I calculate that a 1 arc minute of FOV is imaged by a 7 micrometer line segment in the retina (assuming a 25 mm diameter eyeball) . . . it looks like the receptors in your picture might be 5 micrometers apart...?
But I have no idea whatsoever how 130 million rods and cones per eye "map" to one million plus optic nerve fibers per eye!