Table 8. Correlation between cone density/arrangement and OCT findings in eyes with retinitis pigmentosa.

	Cone density (cones/mm2)	Ratio of hexagonal Voronoi domain (%)	Average NND/expected NND
Total foveal thickness (µm)	P  = 0.008 rs  = 0.679	P = 0.267 rs = 0.32	P = 0.061 rs = 0.51
ONL thickness (µm)	P  = 0.029 rs  = 0.58	P = 0.122 rs = 0.43	P = 0.227 rs = 0.35
IS+OS thickness (µm)	P  = 0.011 rs  = 0.66	P = 0.114 rs = 0.44	P  = 0.029 rs  = 0.58
Width of remaining IS ellipsoid	P = 0.483 rs = 0.20	P = 0.911 rs = 0.03	P = 0.349 rs = 0.27

Spearman's correlation.

NND: nearest-neighbor distance, ONL: outer nuclear layer, IS: inner segment of photoreceptor, OS: outer segment of photoreceptor.