Table 2. Comparison of the peripapillary retinal nerve fibre layer thickness parameters between non-arteritic anterior ischaemic optic neuropathy and primary open-angle glaucoma.

	NAION	POAG	P value*
Average RNFL thickness	65.0 ± 12.3	64.5 ± 11.6	0.742
Quadrant RNFL thickness
Superior	71.2 ± 22.7	76.8 ± 18.9	0.245
Nasal	54.6 ± 10.0	57.6 ± 8.7	0.203
Inferior	80.3 ± 23.6	71.2 ± 21.8	0.176
Temporal	53.4 ± 12.1	52.6 ± 13.3	0.901
Clock-hour RNFL thickness
11 o’clock	73.9 ± 25.3	75.0 ± 23.1	0.822
12 o’clock	76.2 ± 27.4	79.3 ± 22.0	0.393
1 o’clock	62.8 ± 17.3	76.1 ± 21.7	<0.001
2 o’clock	58.0 ± 14.8	68.2 ± 15.8	0.005
3 o’clock	52.2 ± 9.5	51.8 ± 9.9	0.862
4 o’clock	53.5 ± 7.9	53.1 ± 9.1	0.729
5 o’clock	64.8 ± 16.0	66.8 ± 14.0	0.329
6 o’clock	82.2 ± 28.9	74.8 ± 21.2	0.400
7 o’clock	94.0 ± 29.7	72.0 ± 25.3	0.001
8 o’clock	55.5 ± 14.3	52.5 ± 13.2	0.407
9 o’clock	49.2 ± 10.8	49.0 ± 12.7	0.916
10 o’clock	55.4 ± 17.7	56.3 ± 17.5	0.732

(μm, mean ± SD)

NAION = non-arteritic anterior ischaemic optic neuropathy, POAG = primary open-angle glaucoma

RNFL = retinal nerve fibre layer

* Axial length adjusted analysis of covariance.