Clinically relevant differences in the selection of toric intraocular lens power in normal eyes: preoperative measurement vs intraoperative aberrometry

Figures & data

Table 1 Residual spherical equivalent refraction by method (n=118)

	Within
	±0.25D	±0.50D	±1.00D	Mean (D)	Mean absolute (D)
Actual	89 (75.4%)	109 (92.4%)	118 (100%)	−0.10	0.23
Preop	67 (56.8%)	102 (86.4%)	118 (100%)	−0.21	0.31
IA	85 (72%)	110 (93.2%)	117 (99.2%)	−0.08	0.24

Abbreviations: D, diopter; Preop, preoperative; IA, intraoperative aberrometry.

Table 2 Best IOL sphere power by difference in suggested lens power

		IA suggests lower by	IA suggests lower by	No difference	IA suggests higher by
	n	1.0D	0.5D		0.5D
Preop better	5	3	1		1
Same	108		52	50	6
IA better	5	5
All eyes	118	8	53	50	7

Abbreviations: n, number of eyes; D, diopter; IA, intraoperative aberrometry; Preop, preoperative; IOL, intraocular lens.

Table 3 Residual cylinder by method (n=118)

	Within
	±0.50D	±0.75D	±1.00D	Mean (SD)
Actual	92 (78.0%)	111 (94.1%)	115 (97.5%)	0.40 (0.32)
Preop	63 (53.4%)	90 (76.3%)	101 (85.6%)	0.64 (0.40)
IA	89 (75.4%)	107 (90.7%)	111 (94.1%)	0.45 (0.44)
Barrett	89 (75.4%)	104 (88.1%)	111 (94.1%)	0.46 (0.40)

Abbreviations: n, number of eyes; D, diopter; IA, intraoperative aberrometry; Preop, preoperative.

Table 4 Differences in IOL cylinder power and/or orientation

			Orientation
			Same	Different	Total
IA vs Actual	IOL	Same	83 (70%)	5 (4%)	88 (75%)
		Different	23 (19%)	7 (6%)	30 (25%)
		Total	106 (90%)	12 (10%)	118 (100%)
			Same	Different	Total
IA vs Barrett	IOL	Same	21 (18%)	40 (34%)	61 (52%)
		Different	20 (17%)	37 (31%)	57 (48%)
		Total	41 (35%)	77 (65%)	118 (100%)
			Same	Different	Total
IA vs Preop	IOL	Same	16 (14%)	37 (31%)	53 (45%)
		Different	21 (18%)	44 (37%)	65 (55%)
		Total	37 (31%)	81 (69%)	118 (100%)

Abbreviations: vs, versus; IA, intraoperative aberrometry; Preop, preoperative.

Table 5 Relatively lower expected residual cylinder by IOL calculation method

	IOL	Orientation	Actual Better	Same	IA Better	Total
IA vs Actual	Same	Same		83		83
	Same	Different	1	4		5
	Different	Same		20	3	23
	Different	Different	4	3		7
		Total	5	110	3	118
	IOL	Orientation	Barrett Better	Same	IA Better	Total
IA vs Barrett	Same	Same		21		21
	Same	Different	4	26	10	40
	Different	Same	7	8	5	20
	Different	Different	9	22	6	37
		Total	20	77	21	118
	IOL	Orientation	Preop Better	Same	IA Better	Total
IA vs Preop	Same	Same		16		16
	Same	Different	4	19	14	37
	Different	Same	6	10	5	21
	Different	Different	6	16	22	44
		Total	16	61	41	118

Abbreviations: vs, versus; IA, intraoperative aberrometry; Preop, preoperative.