Peripapillary atrophy (PPA) is a clinical finding associated with chorioretinal thinning and disruption of the retinal pigment epithelium (RPE) in the area surrounding the optic disc.
The software defines the peripapillary region as a 1.0-mm wide round annulus extending from the optic disc boundary (Fig. 1A). The peripapillary vessels were analyzed in superficial retinal layers from the RPC segment that extends from the inner limiting membrane to the nerve fiber layer (Fig.Aug 1, 2019
What is Peripapillary atrophy in glaucoma?
Peripapillary Atrophy (PPA) Indicates Optic Disc Stiffening in Primary Open Angle Glaucoma (POAG) without Statistically Elevated Intraocular Pressure (IOP)
What causes choroidal crescent?
Similarly, choroidal crescents result from the absence of retinal tissue directly adjacent to the ONH, allowing more detailed visualization of the underlying choroidal pigment in the region. Crescents may change over time with globe elongation or other pathologies that cause retinal stretching.Jun 15, 2014
What is retinal nerve fiber layer?
The retinal nerve fiber layer (RNFL) or nerve fiber layer, stratum opticum, is formed by the expansion of the fibers of the optic nerve; it is thickest near the optic disc, gradually diminishing toward the ora serrata.