Table 1. Mean cone densities grouped by age and cone spectral class.

	S-densities (cones/mm2)		M/L-densities (cones/mm2)
	Young	Old	Young	Old
	371	478	4553	4,217
	431	392	4162	4,160
	378	283	4387	4,530
Mean	393	384	4368	4,302

Cone densities derived from exponential models by interpolating cone density over the central 20 mm.