Repeatability of Aberrometry-Based Automated Subjective Refraction in Healthy and Keratoconus Subjects

Table 3

Intersession repeatability of the three sessions in terms of repeatability (S_r) and its 95% confidence interval (r) for spherical equivalent (M), cylindrical vectors (J0 and J45), binocular corrected visual acuity (BCDVA), and spent time in refraction.

Variable	Group	Mean ± SD			Repeatability (Sr)	95% confidence interval (r)
		Session 1	Session 2	Session 3
M (D)	Healthy	−1.06 ± 2.54	−1.06 ± 2.48	−1.02 ± 2.50	0.27	0.74
	Keratoconus	−4.76 ± 4.82	−4.45 ± 4.66	−4.42 ± 4.72	0.65	1.82
J0 (D)	Healthy	0.05 ± 0.38	0.06 ± 0.39	0.07 ± 0.35	0.09	0.26
	Keratoconus	−0.71 ± 1.49	−0.78 ± 1.44	−0.79 ± 1.53	0.29	0.81
J45 (D)	Healthy	0.07 ± 0.25	0.06 ± 0.21	0.06 ± 0.24	0.06	0.18
	Keratoconus	−0.05 ± 1.24	0.01 ± 1.29	−0.01 ± 1.28	0.24	0.67
BCDVA (logMAR)	Healthy	−0.21 ± 0.12	−0.22 ± 0.07	−0.23 ± 0.08	0.04	0.12
	Keratoconus	0.04 ± 0.21	0.04 ± 0.20	0.06 ± 0.22	0.04	0.12
Time (min : s)	Healthy	4 : 43 ± 0 : 47	4 : 01 ± 0 : 37	4 : 00 ± 0 : 44	0 : 31	1 : 26
	Keratoconus	5 : 31 ± 1 : 40	5 : 12 ± 1 : 35	5 : 02 ± 1 : 48	0 : 44	2 : 03