Beta zone parapapillary atrophy in elderly Chinese

Purpose Assess the beta zone parapapillary atrophy in elderly Chinese. Patients and methods The Beijing Eye Study 2011 is a population-based cross-sectional study, which includes 3468 patients with the average age of 64.5 [+ or -] 9.8 years. The beta zone of parapapillary atrophy was captured and analyzed morphometrically by using colour optic disc photographs. Results The beta zone was found in 1358 (39.9%) eyes, measuring 0.37 [+ or -] 0.84 mm.sup.2 in size, 203.5 [+ or -] 81.8[degrees] in circumferential angle, 0.36 [+ or -] 0.27 mm in the maximum radial extent, the most often and longest in the temporal peripapillary region, followed by the temporal inferior region and the temporal superior region, the nasal region at least. Beta zone has statistically significant association with male gender (P = 0.001), myopic refractive error (P = 0.003), thinner retinal nerve fiber layer thickness (P