Comparison of Two Toric IOL Calculation Methods

Table 3

Comparison of the predicted postoperative refraction estimated by the standard and the Barrett calculator. Subgroup analysis for with-the-rule (WTR) and against-the-rule (ATR) astigmatism.

Subgroup	Calculator	Mean SE (D)	Mean sphere (D)	Mean cylinder (D)
All ()	Standard	−0.67 ± 0.77	−0.49 ± 0.81	−0.37 ± 0.29
	Barrett	−0.38 ± 0.73	−0.10 ± 1.10	−0.21 ± 0.20
	value	<0.01	<0.01	<0.01
WTR ()	Standard	−0.70 ± 0.80	−0.52 ± 0.84	−0.37 ± 0.27
	Barrett	−0.35 ± 0.73	−0.25 ± 0.71	−0.19 ± 0.18
	value	<0.01	<0.01	<0.01
ATR ()	Standard	−0.46 ± 0.44	−0.24 ± 0.41	−0.43 ± 0.37
	Barrett	−0.31 ± 0.47	0.75 ± 1.82	−0.28 ± 0.26
	value	<0.01	<0.01	0.14