What is the Peripapillary area?
What is the Peripapillary area?
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.
What is an RNFL test?
RNFL analysis is an extremely helpful tool for the management of glaucoma patients. It can be used in conjunction with other examination findings and diagnostic imaging tools to diagnose early or preperimetric cases, and the quantitative nature of these measurements is useful for monitoring disease progression.
What is normal RNFL thickness?
Average RNFL thickness indicates a patient’s overall RNFL health. The mean value for RNFL thickness in the general population is 92.9 +/- 9.4 microns. Typically, a normal, nonglaucomatous eye has an RNFL thickness of 80 microns or greater. An eye with an average RNFL thickness of 70 to 79 is suspicious for glaucoma.
What is nerve fiber analysis?
A nerve fiber analysis test will detect any damage to the nerve fiber layer around the optic nerve due to glaucoma. This process is painless and takes approximately five minutes. The test consists of a scanning laser used to measure the thickness of the nerve fiber layer around the optic nerve.
Is Peripapillary atrophy normal?
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. It is non-specific and can occur in both benign and pathologic conditions, including glaucoma 1 and high myopia 2.
Can Peripapillary atrophy cause visual field defects?
Disc tilting and large amounts of peripapillary atrophy (PPA), and larger disc area, for example, can disturb the interpretation of standard glaucoma tests9. There are reports that myopic degeneration can also cause glaucomatous-like visual field (VF) defects, which can minimally or not progress as glaucoma10,11.
What quadrants are RNFL?
Normal RNFL thickness values follow the ISNT rule with decreasing RNFL thickness values starting from the thickest quadrant inferiorly to the thinnest quadrant temporally: inferior quadrant (126 ± 15.8), superior quadrant (117.2±16.13), nasal quadrant (75 ± 13.9), and temporal quadrant (70.6 ± 10.8 µm).
What are RNFL quadrants?
What does Oct stand for in Optometry?
Optical coherence tomography
Optical coherence tomography (OCT) is a non-invasive imaging test. OCT uses light waves to take cross-section pictures of your retina. With OCT, your ophthalmologist can see each of the retina’s distinctive layers. This allows your ophthalmologist to map and measure their thickness.
What is RNFL defect?
Retinal nerve fiber layer (RNFL) abnormalities, manifesting as thinning or defects, are frequently encountered in subjects with diabetes. 3–5. Thinning of the RNFL around the optic disc and macula thinning have been reported, and these changes often occur before the development of DR.
