Location of Parapapillary Gamma Zone and Vertical Fovea Location. The Beijing Eye Study 2011.

Purpose: To assess the spatial relationship between the locations of the parapapillary gamma zone and the fovea.

Methods: In a non-glaucomatous subgroup of the population-based Beijing Eye Study population, we measured the mean angle between the optic disc-fovea line and the horizontal (disc-fovea angle), the vertical distance of the fovea from the horizontal through the optic disc center (fovea vertical distance), and the location and width of the widest part of parapapillary gamma zone.

Results: The study included 203 individuals (203 eyes; mean axial length, 24.