Table 2. Measurements of the LCD and average PTT in the three groups.

	NAION (n = 21)	Healthy (n = 42)	NTG (n = 42)	P value*	Post hoc†
LCD, μm	390.1 ± 111.8	427.3 ± 94.1	494.2 ± 92.8	0.001	NTG > NAION = Healthy
Average PTT, μm	247.1 ± 75.3	334.7 ± 81.2	178.7 ± 52.1	<0.001	Healthy > NAION > NTG

Data are presented as mean ± standard deviation.

NAION, nonarteritic anterior ischemic optic neuropathy; NTG, normal tension glaucoma; LCD, anterior lamina cribrosa surface depth; PTT, prelaminar tissue thickness.

* Comparison was performed using Kruskal-Wallis test.

^† Post-hoc analysis was performed using the Mann-Whitney U test.