Retrospective analysis of an intraoperative aberrometry database: a study investigating absolute prediction in eyes implanted with low cylinder power toric intraocular lenses

Figures & data

Table 1 Preoperative lens power formulas used (N=6460)

Formula	n	Percent
Haigis	147	2.3
Hoffer Q	171	2.7
Holladay 1	1038	16.1
Holladay 2	3077	47.6
Olsen	3	<0.01
Other	228	3.5
SRK/T	1796	27.8

Table 2 Comparison of prediction errors by preoperative formula

Formula (n [eyes])	Preoperative formula			Intraoperative aberrometry
	Mean error	Median error	Percent of eyes with ≤0.5 D	Mean error	Median error	Percent of eyes with ≤0.5 D
Holladay 1 (1038)	0.35	0.28	77.3	0.30	0.23	82.8
Holladay 2 (3077)	0.36	0.28	76.2	0.29	0.24	83.9
SRK/T (1796)	0.36	0.29	75.2	0.29	0.23	83.1

Table 3 Refractive outcomes in all eyes and in eyes in which power of the implanted IOL differed from that of the preoperatively planned lens, data for all patients

All eyes	All patients^a			Patients with one eye only in the database^b
	IA prediction error	Preoperative prediction error	Paired difference	IA prediction error	Preoperative prediction error	Paired difference
MAE, D	0.29	0.35	−0.06^c	0.29	0.35	−0.06^c
MedAE, D	0.23	0.28	−0.04^c	0.24	0.28	−0.03^c
Eyes within ±0.5 D
n	5388	4942	-	4212	3873	-
%	83.4	76.5	6.9^c	83.2	76.5	6.7^c
Eyes in which power of the implanted IOL differed from that of plan
MAE, D	0.29	0.42	−0.13^c	0.29	0.42	−0.13^c
MedAE, D	0.23	0.34	−0.15^c	0.24	0.34	−0.14^c
Eyes within ±0.5 D
n	2155	1781	-	1692	1407	-
%	83.3	68.8	14.5^c	82.9	68.9	14.0^c

Notes: ^aN=6460 for all eyes, N=2587 for eyes in which power of the implanted IOL differed from that of plan. ^bN=5062 for all eyes, N=2042 for eyes in which power of the implanted IOL differed from that of plan. ^cp<0.0001.

Abbreviations: D, diopters; IOL, intraocular lens; MAE, mean absolute error; MedAE, median absolute error; IA, intraoperative aberrometry.

Figure 1 Lens power implanted.

Abbreviation: IA, intraoperative aberrometry.