Multivariate Analysis of the Ocular Response Analyzer’s Corneal Deformation Response Curve for Early Keratoconus Detection

Table 4

Factor analysis of the corneal deformation response curve. Factors are shown on top in the order in which they were extracted (as described in Section 2). Corneal descriptor loadings are summarized for each factor.

Factor	1	2	3	4	5	6	7
Name	Peak2	Peak1	OverallPeak1	OverallPeak2	Conventional	OverallWaveform	Peak1Extra
% of Variance	27.7	22.0	12.1	8.7	7.8	4.1	3.8
Cumulative %	27.7	49.8	61.9	70.6	78.3	82.5	86.3
CH					0.907
CRF					0.919
timeout					0.801
timein					0.618	0.504
aplhf						0.671
bindex	0.656					−0.531
mslew2	0.945
aspect2	0.944
slew2	0.938
aspect21	0.937
uslope2	0.933
h2	0.905
dslope2	0.905
dslope21	0.893
uslope21	0.848
dive2	0.832
w2	−0.691
p2area1	0.539			0.740
p2area	0.512			0.744
w21	−0.594			0.663
path2				−0.790
path21				−0.746
uslope11		0.839
uslope1		0.881
slew1		0.892
mslew1		0.901
dslope1		0.790
dslope11		0.727
aspect1		0.897
h1		0.825
dive1		0.829
aspect11		0.875
p1area		0.511	0.780
path11			−0.865
p1area1			0.813
path1			−0.917
w11			0.801
w1			0.599
aindex							0.681