Mean Platelet Volume in Patients with Nonarteritic Anterior Ischemic Optic Neuropathy

Objective. We aimed to investigate the mean platelet volume (MPV) of the patients with nonarteritic anterior ischemic optic neuropathy (NAION). Methods. The medical records of 46 patients with the diagnosis of NAION and 90 control subjects were retrospectively evaluated. All participants underwent complete ocular examination including intraocular pressure (IOP) measurement. Hematocrit, MPV, hemoglobin, and platelet levels of the patients with NAION were compared with those of control subjects. Results. There was no significant difference between the groups in platelet counts (p=0.76). NAION group had significantly higher MPV values (8.25±1.26 fL) than that of control subjects (7.64±1.01 fL) (p<0.001). Multivariate logistic regression analysis showed that MPV is an independent predictor of NAION (odds ratio = 1.61; 95% confidence interval (CI) = 1.13–2.28; p=0.007). The mean IOP was significantly higher in NAION group (p