Table 1.

Instrument algorithm RNFL thickness measures for quadrant and clock hours for Cirrus and Spectralis SD-OCT. Along with the paired t-test statistic, the intraclass correlation coefficient (ICC) with 95% confidence intervals provides a measure of agreement for the two segmentation algorithms.

	Cirrus		Spectralis			95% Confidence		Paired t-test
	Mean (µm)	Std Dev	Mean (µm)	Std Dev	ICC	Lower	Upper
Global	91.17	8.42	97.92	7.94	0.623	−0.074	0.864	<0.001
Temporal	63.71	12.96	72.79	12.71	0.765	−0.054	0.938	<0.001
Superior	115.03	14.94	118.52	12.98	0.734	0.552	0.847	0.022
Nasal	65.89	10.06	74.56	15.88	0.559	0.119	0.780	<0.001
Inferior	120.08	16.39	125.21	15.21	0.764	0.544	0.876	0.001
Sector 1	49.57	8.70	58.81	10.87	0.631	−0.071	0.887	<0.001
Sector 2	77.15	19.18	85.73	17.53	0.853	0.068	0.957	<0.001
Sector 3	125.78	21.95	134.40	23.92	0.780	0.491	0.895	<0.001
Sector 4	114.12	24.88	112.97	22.18	0.797	0.658	0.883	0.613
Sector 5	105.17	16.77	108.18	18.31	0.794	0.653	0.882	0.075
Sector 6	80.23	17.45	90.59	23.26	0.743	0.256	0.893	<0.001
Sector 7	55.31	9.79	62.95	15.50	0.414	0.110	0.640	<0.001
Sector 8	62.12	10.60	70.13	16.12	0.571	0.182	0.776	<0.001
Sector 9	95.75	18.21	99.21	18.00	0.701	0.517	0.824	0.100
Sector 10	134.94	26.79	137.62	27.59	0.801	0.666	0.885	0.301
Sector 11	129.53	26.72	138.45	25.62	0.885	0.465	0.959	<0.001
Sector 12	64.40	15.79	73.37	15.84	0.759	0.080	0.915	<0.001