Table 2.

Optic disc measurements of the parapapillary region

	Mean (SD)	SE	Range	Frequency
α zone area (mm2); total	0.74 (0.26)	0.03	0.00–1.47	69/70 = 98.6%
Temporal horizontal	0.32 (0.13)	0.01	0.00–0.75	69/70 = 98.6%
Temporal inferior	0.25 (0.11)	0.01	0.00–0.56	69/70 = 98.6%
Temporal superior	0.15 (0.08)	0.01	0.00–0.42	68/70 = 97.1%
Nasal	0.02 (0.08)	0.01	0.00–0.49	20/70 = 28.6%
Width (mm), temporal horizontal	0.29 (0.11)	0.01	0.00–0.66
Temporal inferior	0.15 (0.07)	0.01	0.00–0.34
Temporal superior	0.09 (0.04)	0.005	0.00–0.23
Nasal	0.01 (0.03)	0.004	0.00–0.21
β zone; total	0.10 (0.28)	0.03	0.00–1.27	8/70 = 11.4%
Temporal horizontal	0.04 (0.13)	0.02	0.00–0.59	8/70 = 11.4%
Temporal inferior	0.03 (0.11)	0.01	0.00–0.64	8/70 = 11.4%
Temporal superior	0.02 (0.05)	0.01	0.00–0.28	8/70 = 11.4%
Nasal	0.001 (0.01)	0.001	0.00–0.05	1/70 = 1.4%
Width (mm), temporal horizontal	0.05 (0.13)	0.02	0.00–0.59
Temporal inferior	0.02 (0.06)	0.01	0.00–0.37
Temporal superior	0.01 (0.04)	0.006	0.00–0.21
Nasal	0.001 (0.001)	0.001	0.00–0.03
Arteriole diameter (mm);
Temporal inferior	0.106 (0.021)	0.003	0.070–0.160
Temporal superior	0.104 (0.019)	0.002	0.070–0.170
Nasal superior	0.091 (0.023)	0.003	0.050–0.160
Nasal inferior	0.092 (0.022)	0.003	0.040–0.150
Venule diameter (mm);
Temporal inferior	0.131 (0.030)	0.004	0.070–0.200
Temporal superior	0.134 (0.030)	0.004	0.070–0.210
Nasal superior	0.109 (0.027)	0.003	0.070–0.210
Nasal inferior	0.110 (0.027)	0.003	0.070–0.180
RNFL visibility (relative units); total	28.84 (4.64)	0.59	16–37
Temporal inferior	6.29 (1.22)	0.15	3–8
Temporal superior	5.90 (1.18)	0.15	3–8
Nasal superior	3.44 (1.13)	0.14	1–6
Nasal inferior	3.27 (0.85)	0.11	2–5
Temporal horizontal	1.94 (0.60)	0.08	1–3
Superior	2.82 (0.78)	0.01	1–4
Nasal	2.08 (0.61)	0.08	1–3
Inferior	3.07 (0.81)	0.10	1–4