Table 1. Measurements (Mean ± Standard Deviation) of Optic Disc Parameters in Patients with unilateral or bilateral non-arteritic anterior ischemic optic neuropathy (NA-AION).

	Unilateral NA-AION			Bilateral NA-AION
	Affected Eye	Unaffected Eye	P-Val.	Right Eyes	Left Eyes
Optic Disc Diameter
Horizontal	4.54±0.49	4.61±0.48	0.30	4.49±0.44 (P* = 0.11)	4.66±0.53 (P* = 0.06)
Vertical	4.71±0.57	4.84±0.52	0.61	4.74±0.63 (P* = 0.26)	4.81±0.54 (P* = 0.43)
Cup/Disc Diameter Ratio
Horizontal	0.19±0.14	0.20±0.11	0.47	0.18±0.12 (P* = 0.33)	0.22±0.15 (P* = 0.07)
Vertical	0.21±0.15	0.20±0.12	0.19	0.18±0.12 (P* = 0.22)	0.24±0.16 (P* = 0.06)

P-Val.: Statistical significance of the difference between the affected eyes and the unaffected eyes of patients with unilateral NA-AION.

P*: Statistical significance of the difference between the eyes of patients of bilateral NA-AION and the unaffected eyes of patient with unilateral NA-AION.