Repeatability of Aberrometry-Based Automated Subjective Refraction in Healthy and Keratoconus Subjects
Table 4
Mean difference between sessions (bias) and its standard deviation (SD) for spherical equivalent (M), cylindrical vectors (J0 and J45), binocular corrected visual acuity (BCDVA), and spent time in refraction.
Variable
Group
Session 1-session 2
Session 1–session 3
Session 2-session 3
ANOVA ( value)
M (D)
Healthy
Bias ± SD
0.00 ± 0.07
−0.04 ± 0.08
−0.04 ± 0.05
0.806
value
>0.999
>0.999
>0.999
Keratoconus
Bias ± SD
−0.32 ± 0.18
−0.35 ± 0.17
−0.03 ± 0.13
0.146
value
0.245
0.166
>0.999
J0 (D)
Healthy
Bias ± SD
−0.01 ± 0.02
−0.02 ± 0.02
−0.01 ± 0.03
0.607
value
>0.999
>0.999
>0.999
Keratoconus
Bias ± SD
0.07 ± 0.07
0.08 ± 0.08
0.01 ± 0.08
0.511
value
0.913
0.944
>0.999
J45 (D)
Healthy
Bias ± SD
0.00 ± 0.02
0.01 ± 0.02
0.01 ± 0.02
0.756
value
>0.999
>0.999
>0.999
Keratoconus
Bias ± SD
−0.06 ± 0.05
−0.05 ± 0.07
0.02 ± 0.06
0.518
value
0.748
>0.999
>0.999
BCDVA (logMAR)
Healthy
Bias ± SD
0.01 ± 0.01
0.02 ± 0.01
0.00 ± 0.01
0.425
P value
>0.999
0.621
>0.999
Keratoconus
Bias ± SD
0.01 ± 0.01
−0.02 ± 0.01
−0.02 ± 0.01
0.143
value
>0.999
0.707
0.142
Time (min : s)
Healthy
Bias ± SD
0 : 22 ± 0.07
0 : 23 ± 0 : 09
0 : 01 ± 0 : 05
0.011
value
0.007¥
0.037¥
>0.999
Keratoconus
Bias ± SD
0 : 20 ± 0 : 08
0 : 30 ± 0 : 13
0 : 10 ± 0 : 11
0.047
value
0.080
0.081
>0.999
The statistical comparison was performed between sessions. , one-way ANOVA for related samples. ¥, pairwise comparison with Bonferroni correction.
