Repeatability of Ocular Measurements with a Dual-Scheimpflug Analyzer in Healthy Eyes
Table 2
Mean axial corneal parameters and standard deviations, ANOVA test, repeatability, intraclass coefficients, and coefficients of variation in healthy eyes.
Axial parameters
Mean1 ± SD
Mean2 ± SD
Mean3 ± SD
ANOVA
Mean ± Sw
ICC (lower 95% CI)
COV (%)
Anterior best fit sphere (mm)
7.78 ± 0.25
7.78 ± 0.25
7.78 ± 0.24
0.286
7.78 ± 0.25
0.68
1.00 (0.95)
3.14
AA SimK steepest (D)
44.22 ± 1.43
44.23 ± 1.45
44.13 ± 1.53
0.448
44.19 ± 1.43
3.95
0.97 (0.95)
3.23
AA SimK flattest (D)
43.43 ± 1.42
43.40 ± 1.35
43.34 ± 1.58
0.666
43.39 ± 1.40
3.87
0.96 (0.94)
3.22
AA SimK average (D)
43.82 ± 1.40
43.82 ± 1.38
43.74 ± 1.53
0.543
43.79 ± 1.39
3.86
0.97 (0.95)
3.18
AA curvature average in (D)
43.84 ± 1.40
43.84 ± 1.36
43.75 ± 1.55
0.518
43.81 ± 1.39
3.84
0.96 (0.94)
3.17
AA Curvature average mid (D)
43.38 ± 1.32
43.38 ± 1.39
43.35 ± 1.32
0.408
43.37 ± 1.34
3.71
1.00 (0.99)
3.09
AA curvature average out (D)
42.57 ± 1.21
42.56 ± 1.22
42.59 ± 1.28
0.881
42.57 ± 1.20
3.32
0.97 (0.96)
2.82
Posterior best fit sphere (mm)
6.39 ± 0.29
6.42 ± 0.25
6.41 ± 0.25
0.172
6.41 ± 0.26
0.70
0.96 (0.94)
3.97
PA SimK steepest (D)
−6.51 ± 0.29
−6.54 ± 0.37
−6.51 ± 0.31
0.356
−6.52 ± 0.31
0.85
0.93 (0.89)
4.68
PA SimK flattest (D)
−6.17 ± 0.25
−6.18 ± 0.26
−6.17 ± 0.28
0.589
−6.17 ± 0.26
0.71
0.98 (0.96)
4.14
PA SimK average (D)
−6.34 ± 0.27
−6.36 ± 0.30
−6.34 ± 0.29
0.356
−6.35 ± 0.28
0.76
0.96 (0.94)
4.32
PA curvature average in (D)
−6.34 ± 0.27
−6.37 ± 0.30
−6.35 ± 0.29
0.438
−6.35 ± 0.28
0.77
0.95 (0.93)
4.36
PA curvature average mid (D)
−6.28 ± 0.29
−6.23 ± 0.25
−6.26 ± 0.24
0.133
−6.25 ± 0.24
0.67
0.92 (0.87)
3.86
PA curvature average out (D)
−6.11 ± 0.28
−6.01 ± 0.46
−6.08 ± 0.22
0.152
−6.07 ± 0.25
0.69
0.60 (0.38)
4.10
AA: anterior axial; PA: posterior axial; SD: standard deviation; Sw: within-subject SD; : ANOVA-test (values of were considered to be indicative of significant differences); : repeatability limits; ICC: intraclass coefficient; COV: coefficient of variation.
