9 Spectral-domain OCT adjustments using the DFA usually result in increased inferotemporal (IT) RNFL and decreased supero-temporal RNFL thickness measurements. 8Įyes with greater DFA have a difference of more than 20% in the minimum optic nerve rim width between superior and inferior temporal sectors when the centroid of the optic nerve head and fovea are aligned. For instance, in myopic eyes the greater the DFD, the greater the DFA. Inter-individual differences in these parameters could potentially affect the distribution of the RNFL bundles that project from the macula to the optic nerve head. The displacement of the foveal region relative to the optic nerve head is due to a combination of inter-related, variable distances (disc-fovea distance, DFD) and angles (disc-fovea angle, DFA) between the fovea and the optic nerve head among healthy subjects and glaucomatous patients. 3– 6 The investigation of the macular area has gained more attention after advances of imaging technologies that now enable high-resolution, 3-dimensional analysis of the retina layers, particularly after the introduction of spectral-domain optical coherence tomography (sdOCT). 1, 2 In recent studies, glaucoma at all stages has been associated with damage to the macular RGC complex, with RNFL damage corresponding to this region. All this research, development and testing ensures maximum horsepower gains throughout a broad power band all while maintaining reasonable sound levels for the street and provide a distinct, sporty exhaust note that is purely Porsche.Glaucomatous visual field (VF) loss results from damage to the retinal ganglion cells (RGC) and often follow the anatomical arcuate trajectory of the axons in the retinal nerve fiber layer (RNFL).
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