Table 3.

Results from Principal Components Analysis

	Component 1 Cup	Component 2 RNFL	Component 3 Rim
Cup area, mm2	0.364	−0.078	0.178
Rim area, mm2	0.012	−0.060	0.777
Cup-to-disc area ratio	0.336	−0.045	−0.039
Rim-to-disc area ratio	−0.336	0.045	0.039
Cup volume, mm3	0.338	−0.034	0.129
Rim volume, mm3	−0.051	0.221	0.506
Mean cup depth, mm	0.327	0.164	−0.041
Maximum cup depth, mm	0.283	0.210	−0.108
Height variation contour, mm	0.007	0.382	−0.049
Cup shape measure	0.192	−0.063	0.126
Mean RNFL thickness, mm	−0.055	0.482	−0.098
RNFL cross-sectional area, mm2	0.050	0.442	0.176
Horizontal cup-to-disc ratio	0.304	0.003	−0.076
Vertical cup-to-disc ratio	0.316	−0.024	−0.026
CLM temporal–superior, mm	0.001	0.402	−0.046
CLM temporal–inferior, mm	−0.027	0.355	−0.023
Linear cup-to-disc ratio	0.321	−0.006	−0.090

Following rotation, three components with an eigenvalue >1 explained 79.9% of the variance. The factor loadings are presented below, and based on these, the components were named cup, RNFL, and rim. Factor loading magnitudes >0.25 are in bold.