Evaluating Rotational Stability of an Extended Depth of Focus Toric Intraocular Lens Using a Slit Lamp and Image-Based Analysis

Figures & data

Figure 1 Slit lamp photographs taken at (A) Day 1 (baseline), (B) Month 1 and (C) Month 3. (D) Analyzed picture at Month 1 showing the blue squares that represent the baseline landmarks chosen by examiner while the green squares represent the ones chosen in the Month 1 image. (E) Analyzed picture at Month 3. Good image alignment is shown by the blue and green squares overlapping.

Table 1 Rotation Summary by Method and Time

Time Period	Method	n	Mean ± SD (Range)	p-value*	Absolute Mean ± SD (Range)	Percent ≤5 Degrees	p-value**	Difference >10 Degrees
1 day to 1 month	Slit lamp	146	−0.85 ± 3.8 (−20 to 19)	0.39	2.24 ± 3.2 (0 to 20)	90% (132/146)	0.016	3
	Imaging System	102	−1.20 ± 2.1 (−17 to 2)		1.45 ± 1.9 (0 to 17)	98% (100/102)		1
1 day to 3 months	Slit lamp	148	−0.51 ± 3.6 (−11 to 19)	0.12	2.41 ± 3.0 (0 to 19)	89% (131/148)	0.013	3
	Imaging System	103	−1.09 ± 1.7 (−8 to 17)		1.66 ± 2.1 (0 to 17)	97% (100/103)		1
1 month to 3 months	Slit lamp	144	0.04 ± 2.7 (−10 to 9)	0.89	1.64 ± 2.2 (0 to 10)	92% (133/144)	0.018	0
	Imaging System	100	−0.05 ± 1.5 (−6 to 5)		1.09 ± 1.1 (0 to 6)	99% (99/100)		0

Notes: *ANOVA: mean comparison; **Chi-squared test: imaging system vs slit lamp percentage.

Abbreviations: SD, standard deviation; ANOVA, analysis of variance.