Calculation of Toric Intraocular Lens Power with the Barrett Calculator and Data from Three Keratometers

Table 2

Mean anterior corneal keratometry values obtained using iTrace, IOLMaster, and Pentacam.

	iTrace at 3 mm	IOLMaster at 2.3 mm	Pentacam at 3 mm
	(n = 101)	(n = 101)	(Centered on the corneal apex) (n = 101)
Astigmatism magnitude (D)	1.86 ± 0.77	1.95 ± 0.87	1.83 ± 0.79
	Range: 0.61–4.23	Range: 0.34–4.50	Range: 0.40–3.80
Astigmatism axis (degree)	97 ± 68	99 ± 64	94 ± 47
	Range: 0–179	Range: 1–179	Range: 0–179
Flat keratometry (D)	43.69 ± 1.58	44.04 ± 1.61	44.01 ± 1.58
	Range: 39.58–47.74	Range: 39.57–47.74	Range: 39.40–47.60
Steep keratometry (D)	45.55 ± 1.62	45.99 ± 1.57	45.84 ± 1.60
	Range: 41.02–48.77	Range: 42.13–49.41	Range: 41.10–49.10
Mean keratometry (D)	44.62 ± 1.55	45.02 ± 1.53	44.92 ± 1.54
	Range: 40.30–48.26	Range: 40.85–48.51	Range: 40.25–48.25

D: diopter.