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Birefringent Optical Waveguides
Published in María L. Calvo, Vasudevan Lakshminarayanan, Optical Waveguides, 2018
María L. Calvo, Ramόn F. Alvarez-Estrada
As revealed by electron microscopy, the RNFL contains bundles of nerve cells (nerve-cell axons) that run just under and across the surface of the retina. A nerve fiber bundle contains four different kinds of approximately cylindrical structures: a) axonal cell membranes around nerve axons (axonal membranes), b) microtubules, c) neurofilaments, and d) mitochondria. Those structures lie in a rather complex cellular environment (some aqueous solution of proteins and other cellular constituents). Within the scope of this chapter, it is interesting to describe briefly those structures and their sizes.24
Research Methodology
Published in Arwa Ahmed Gasm Elseid, Alnazier Osman Mohammed Hamza, Computer-Aided Glaucoma Diagnosis System, 2020
Arwa Ahmed Gasm Elseid, Alnazier Osman Mohammed Hamza
The RNFL (retinal nerve fiber layer) is the area surrounding the optic disc. For RNFL extraction a modified mathematical method has been used. This method is based on subtracting the whole image from the disc area. The goal of RNFL extraction is to measure this area thickness using the texture features, which will help in glaucoma detection. RNFL=ROIregion–OD
Glaucoma Detection Using Optical Coherence Tomography Images: A Systematic Review of Clinical and Automated Studies
Published in IETE Journal of Research, 2022
Hina Raja, Muhammad Usman Akram, Taimur Hassan, Aneeqa Ramzan, Amtual Aziz, Hira Raja
Retinal OCT images can detect the structural damage prior to any detectable visual field defects; thus it is effective for early glaucoma diagnosis. Figure 3 shows a retinal OCT image exposing the different retinal layers; ganglion cell layer (GCL), retinal nerve fiber layer (RNFL), and inner limiting member (ILM) have been affected by glaucoma. Analysis of the retinal nerve fiber layer (RNFL), as well as the parameters RNFL thickness and RNFL volume, are significant in discriminating the timely diagnosis of glaucoma.