Predicting the refractive outcome and accuracy of IOL power calculation after phacoemulsification using the SRK/T formula with ultrasound biometry in medium axial lengths

Figures & data

Figure 1 Histogram shows the frequency of prediction error.

Abbreviation: SD, standard deviation.

Table 1 Distribution of the prediction error (difference between attempted and achieved SE) in medium eyes using SRK/T formula and ultrasound biometry (n=538)

Range of SE (D)	n	%
Within ±0.25	208	38.66
Within ±0.50	374	69.51
Within ±1.00	505	93.87
>+1.00 (more hyperopic than predicted)	23	4.275
≥+1.50	9	1.67
≥+2.00	2	0.37
More myopic than predicted −1.00	10	1.86
More myopic than −1.50	2	0.37

Abbreviations: D, diopter; n, number of operated eyes; SE, spherical equivalent.

Figure 2 (A) Scatter plot of prediction error versus age; (B) achieved postoperative SE versus age; (C) achieved postoperative SE versus AL.

Abbreviations: AL, axial length; D, diopter; SE, spherical equivalent.