Table 2.

Left-right and vertical diameter of each layer of optic canal orbital aperture, cranial orifice

	Left-right diameter				Vertical diameter
	Left		Right		Superior		Inferior
	-x ± sd (l/mm)	RSD (%)	-x ± sd (l/mm)	RSD (%)	-x ± sd (l/mm)	RSD (%)	-x ± sd (l/mm)	RSD (%)
Orbital aperture	5.18 ± 0.38	7.38	5.13 ± 0.38	7.46	6.02 ± 0.44	7.27	5.97 ± 0.42	7.06
1 layer	5.19 ± 0.28	5.42	5.19 ± 0.28	5.45	6.00 ± 0.29	4.88	5.95 ± 0.34	5.64
2 layer	5.27 ± 0.23	4.5	5.33 ± 0.25	4.62	5.97 ± 0.31	5.20	5.99 ± 0.33	5.44
3 layer	5.27 ± 0.36	6.74	5.29 ± 0.38	7.25	5.80 ± 0.33	5.64	5.85 ± 0.33	5.70
4 layer	5.17 ± 0.46	8.93	5.23 ± 0.50	9.46	5.62 ± 0.42	7.46	5.67 ± 0.45	7.88
5 layer	5.03 ± 0.33	6.49	5.15 ± 0.38	7.34	5.46 ± 0.36	6.56	5.53 ± 0.32	5.78
6 layer	4.86 ± 0.26	5.43	4.91 ± 0.30	6.05	5.29 ± 0.34	6.43	5.31 ± 0.35	6.62
7 layer	4.91 ± 0.29	5.90	4.91 ± 0.25	5.10	5.26 ± 0.30	5.78	5.27 ± 0.30	5.73
8 layer	5.25 ± 0.50	9.60	5.25 ± 0.46	8.81	5.17 ± 0.44	8.44	5.21 ± 0.49	9.39
9 layer	5.88 ± 0.41	6.96	5.82 ± 0.39	6.66	5.17 ± O.54	10.52	5.17 ± 0.56	10.75
10 layer	6.39 ± 0.41	6.46	6.31 ± 0.33	5.28	5.13 ± 0.48	9.27	5.16 ± 0.56	10.79
11 layer	6.75 ± 0.45	6.64	6.67 ± 0.40	5.95	5.09 ± 0.38	7.39	5.06 ± 0.43	8.50
12 layer	6.99 ± 0.38	5.42	7.06 ± 0.31	4.37	5.06 ± 0.26	5.15	5.13 ± 0.28	5.5l
13 layer	7.12 ± 0.28	3.86	7.07 ± 0.32	4.55	4.92 ± 0.38	7.67	5.00 ± 0.44	8.72
Cranial orifice	7.37 ± 0.39	5.29	7.33 ± 0.38	5.12	4.97 ± 0.30	5.98	5.01 ± 0.27	5.47