Corneal Astigmatism Measurements Comparison among Ray-Tracing Aberrometry, Partial Coherence Interferometry, and Scheimpflug Imaging System

Table 2

Mean simulated corneal astigmatism and corneal power measurements obtained using IOLMaster, Pentacam, and iTrace.

	IOLMaster at 2.3 mm	iTrace at 3 mm	Pentacam at 3 mm (corneal vertex)
Astigmatism magnitude (D)	1.93 ± 0.88	1.89 ± 0.84	1.88 ± 0.90
Astigmatism cardinal	0.65 ± 1.84	0.74 ± 1.78	0.60 ± 1.79
Astigmatism oblique	−0.03 ± 0.86	−0.11 ± 0.78	−0.05 ± 0.89
K flat	44.12 ± 1.69	43.75 ± 1.71	44.06 ± 1.67
K steep	46.05 ± 1.73	45.65 ± 1.72	45.93 ± 1.74
K mean	45.09 ± 1.65	44.71 ± 1.66	45.00 ± 1.65

D = diopters; K = keratometry.