Table 4.

Pearson correlation matrix.

		NFL (µm/mm2)	NFD (no./mm2)	NBD (no./mm)	TC	Age (years)	K (D)	CD (mm)	CCT (mm)	Sph (D)	Cyl (D)
NFL (µm/mm2)	R	1	0.523	0.190	0.603	− 0.528	− 0.053	− 0.024	− 0.058	− 0.423	− 0.340
	p-value*		0.000	0.105	0.000	0.000	0.655	0.836	0.625	0.000	0.003
NFD (no./mm2)	R	0.523	1	− 0.093	0.758	− 0.420	− 0.121	0.187	− 0.190	− 0.341	− 0.165
	p-value*	0.000		0.426	0.000	0.000	0.298	0.110	0.103	0.003	0.155
NBD (no./mm)	R	0.190	− 0.093	1	− 0.051	− 0.107	0.230	0.008	− 0.013	− 0.151	− 0.287
	p-value*	0.105	0.426		0.666	0.362	0.047	0.944	0.909	0.197	0.012
TC	R	0.603	0.758	− 0.051	1	− 0.500	− 0.047	0.125	− 0.132	− 0.351	− 0.155
	p-value*	0.000	0.000	0.666		0.000	0.691	0.293	0.262	0.002	0.183
Age (years)	R	− 0.528	− 0.420	− 0.107	− 0.500	1	− 0.059	− 0.321	0.174	0.275	0.076
	p-value*	0.000	0.000	0.362	0.000		0.616	0.005	0.136	0.016	0.511
K (D)	R	− 0.053	− 0.121	0.230	− 0.047	− 0.059	1	− 0.463	0.102	− 0.067	0.208
	p-value*	0.655	0.298	0.047	0.691	0.616		0.000	0.386	0.566	0.072
CD	R	− 0.024	0.187	0.008	0.125	− 0.321	− 0.463	1	− 0.035	0.123	− 0.150
	p-value*	0.836	0.110	0.944	0.293	0.005	0.000		0.770	0.296	0.201
CCT (mm)	R	− 0.058	− 0.190	− 0.013	− 0.132	0.174	0.102	− 0.035	1	− 0.142	0.193
	p-value*	0.625	0.103	0.909	0.262	0.136	0.386	0.770		0.225	0.096
Sph (D)	R	− 0.423	− 0.341	− 0.151	− 0.351	0.275	− 0.067	0.123	− 0.142	1	0.077
	p-value*	0.000	0.003	0.197	0.002	0.016	0.566	0.296	0.225		0.510
Cyl (D)	R	− 0.340	− 0.165	− 0.287	− 0.155	0.076	0.208	− 0.150	0.193	0.077	1
	p-value*	0.003	0.155	0.012	0.183	0.511	0.072	0.201	0.096	0.510

*NFL nerve fiber length (µm/mm²), NFD nerve fiber density (no./mm²), NBD nerve beadings density (no./mm), TC tortuosity coefficient, K corneal curvature (D diopters), CD corneal diameter (mm), CCT corneal thickness (µm), Sph sphere (D diopters), Cyl cylinder (D diopters).

**Bold values denote statistical significance at the p value < 0.05.