Accuracy of refractive outcomes using standard or total keratometry for intraocular lens power formulas in conventional cataract surgery

Table 3 Performance comparison of different formulas

Formula	FPI	ME	SD	MAE	MedAE	Percentage of eyes within PE (%)
Formula	FPI	ME	SD	MAE	MedAE	± 0.25 D	± 0.50 D	± 0.75 D	± 1.00 D	± 2.00 D
BUII	0.072	0.000	0.448	0.259	0.341	46.085	74.497	90.828	95.749	100
BUII _TK	0.071	0.000	0.451	0.266	0.343	44.743	72.036	90.604	96.421	100
P value		0.999			0.759	0.245	0.824	0.641
Haigis	0.065	0.002	0.503	0.296	0.388	41.256	70.179	87.668	93.946	100
Haigis _TK	0.062	0.000	0.511	0.317	0.399	39.597	67.785	84.787	93.736	100
P value		0.855			0.105	0.203	0.744	0.129
SRK/T	0.061	0.000	0.541	0.333	0.416	39.821	68.233	85.235	93.065	100
SRK/T _TK	0.061	-0.007	0.545	0.331	0.423	37.584	68.233	82.774	93.512	100
P value		0.365			0.365	0.563	0.995	0.021
H2	0.060	0.000	0.567	0.334	0.434	36.689	67.562	82.998	92.841	100
H2 _TK	0.058	0.000	0.562	0.360	0.433	36.913	65.548	83.669	92.841	100
P value		0.999			0.847	0.785	> 0.99	0.544

FPI = formulas performance index; ME = mean error; SD = standard deviation; MAE = mean absolute error; MedAE = median absolute error; PE = prediction error; D = diopter; BUII = Barrett universal II; H2 = Holladay2.

ISSN: 1471-2415