Assessing the interchangeability of keratometry measurements from four biometric devices in intraocular lens power calculations: insights into the predictive accuracy of five modern IOL formulas

Table 2 Refractive outcomes obtained by five formulas on four different machines

Formula	Device	Mean	SD	Min	Max	MAE	RMSAE	MedAE	Percentage (%)
Formula	Device	Mean	SD	Min	Max	MAE	RMSAE	MedAE	± 0.25D	± 0.50D	± 0.75D	± 1.00D
BII	A	0.000	0.411	-1.340	1.180	0.312	0.410	0.250	51.546	79.897	92.268	96.907
	B	0.000	0.434	-1.692	1.288	0.331	0.433	0.282	46.907	81.959	91.237	96.907
	C	0.000	0.467	-1.642	1.228	0.361	0.466	0.288	45.361	73.711	89.691	94.845
	D	0.000	0.478	-2.160	1.350	0.357	0.477	0.270	46.392	76.804	90.722	94.845
K6	A	0.000	0.399	-1.327	1.153	0.305	0.398	0.233	52.850	80.829	93.264	97.409
	B	0.000	0.420	-1.708	1.242	0.319	0.419	0.252	48.187	83.420	91.192	96.891
	C	0.000	0.456	-1.646	1.204	0.354	0.455	0.274	46.114	75.648	90.674	94.819
	D	0.000	0.492	-2.475	1.295	0.355	0.491	0.265	47.150	76.684	90.674	95.337
EVO 2.0	A	0.000	0.411	-1.273	1.107	0.317	0.410	0.257	48.705	79.793	91.192	97.927
	B	0.000	0.428	-1.636	1.214	0.331	0.427	0.264	46.632	79.793	91.192	96.891
	C	0.000	0.460	-1.575	1.155	0.363	0.459	0.315	41.969	74.093	90.155	96.373
	D	0.000	0.478	-2.178	1.242	0.354	0.477	0.282	47.150	77.202	89.119	95.337
Kane	A	0.000	0.415	-1.287	1.213	0.325	0.414	0.267	47.938	80.412	91.753	97.423
	B	0.000	0.431	-1.650	1.230	0.333	0.430	0.270	45.361	80.928	91.753	96.907
	C	0.000	0.459	-1.587	1.163	0.360	0.458	0.298	41.753	72.165	90.206	96.392
	D	0.000	0.488	-2.323	1.347	0.359	0.486	0.280	44.845	78.351	90.206	95.361
DGS	A	0.000	0.401	-1.297	1.113	0.309	0.400	0.243	52.577	81.443	91.753	98.454
	B	0.000	0.429	-1.674	1.316	0.327	0.428	0.276	46.392	81.443	91.237	95.876
	C	0.000	0.462	-1.602	1.248	0.362	0.460	0.295	41.237	72.165	90.206	95.876
	D	0.000	0.489	-2.482	1.318	0.357	0.488	0.288	44.845	77.835	89.691	95.361

BII Barrett Universal II, K6 Cooke K6, EVO emmetropia verifying optical, DGS Pearl-DGS, PE prediction error, D diopter, SD standard deviation, MIN minimum of the prediction error, MAX maximum of the prediction error, MAE mean absolute prediction error, RMSAE root mean square absolute error, MedAE median absolute prediction error, A = IOLMaster 700, B = CASIA2, C = Pentacam, D = iTrace

ISSN: 1471-2415