scholarly journals A Comparison of Retinal Nerve Fibre Layer Thickness by Spectral Domain Optical Coherence Tomography in Primary Open Angle Glaucoma, Normotensive Glaucoma and Glaucoma Suspect

2018 ◽  
Vol 3 (5) ◽  
Author(s):  
Arun Kumar S
Keyword(s):  
Optical Coherence Tomography ◽  
Layer Thickness ◽  
Nerve Fibre ◽  
Primary Open Angle Glaucoma ◽  
Open Angle Glaucoma ◽  
Retinal Nerve Fibre Layer ◽  
Optical Coherence ◽  
Open Angle ◽  
Glaucoma Suspect ◽  
Nerve Fibre Layer

scholarly journals Retinal nerve fibre layer thickness measured by spectral domain optical coherence tomography amongst early primary open-angle glaucoma patients at Hospital Melaka

2020 ◽  
Vol 2 (3) ◽  
pp. 203-218
Author(s):  
Anhar Hafiz Silim ◽  
Raja Norliza Raja Omar ◽  
Othmaliza Othman ◽  
Rona Asnida Nasaruddin ◽  
Norshamsiah Md Din
Keyword(s):  
Optical Coherence Tomography ◽  
Visual Field ◽  
Layer Thickness ◽  
Nerve Fibre ◽  
Primary Open Angle Glaucoma ◽  
Open Angle Glaucoma ◽  
Retinal Nerve Fibre Layer ◽  
Open Angle ◽  
Fibre Layer ◽  
Nerve Fibre Layer

Introduction: Glaucoma is second only to cataract as a cause of blindness worldwide and Asians account for almost half the cases. Retinal nerve fibre layer (RNFL) assessment is an important objective method for diagnosis and monitoring of glaucoma as it develops earlier than the development of visual field defects. Purpose: To estimate the proportion of primary open-angle glaucoma (POAG) patients with normal RNFL thickness (RNFLT) amongst early POAG patients who were under follow-up at the Ophthalmology Department, Hospital Melaka (Melaka, Malaysia). Study design: Observational cross-sectional study. Materials and methods: Consecutive sampling of 64 POAG patients who were diagnosed as early POAG as defined by the Glaucoma Staging System 2 (GSS 2) into stage 1 and 2 on Octopus visual field test were recruited in this study. Data collected included demographic data, refraction, slit-lamp examination, intraocular pressure (IOP), gonioscopy, peripapillary retinal nerve fibre layer thickness (RNFLT) measured by spectral-domain optical coherence tomography (SD-OCT), and fundus photography. Results: Among 64 eyes, 57.8% were found to have normal and 42.2% to have abnormal RNFLT classification. There was no difference in terms of age, gender or ethnicity between those with normal and abnormal RNFLT. Mean IOP at presentation, mean duration of POAG, and mean spherical dioptres were compared between the two groups. Only mean spherical dioptres showed a significant difference between the two groups, p < 0.001. An increase of spherical dioptres also had a moderate positive correlation with RNFLT in most optic disc quadrants except the nasal, temporal, superonasal, and inferonasal quadrants. Conclusion: OCT cannot be used as a diagnostic tool alone, especially in early glaucoma, as it showed a normal RNFLT in almost half the patients. RNFLT in early POAG had significant correlation with spherical dioptres in most quadrants.

scholarly journals Macular, papillary and peripapillary perfusion densities measured with optical coherence tomography angiography in primary open angle glaucoma and pseudoexfoliation glaucoma

2021 ◽  
Author(s):  
Anna Cornelius ◽  
Daniel Pilger ◽  
Aline Riechardt ◽  
Emanuel Reitemeyer ◽  
Anne Rübsam ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Nerve Fibre ◽  
Optical Coherence Tomography Angiography ◽  
Primary Open Angle Glaucoma ◽  
Open Angle Glaucoma ◽  
Retinal Nerve Fibre Layer ◽  
Open Angle ◽  
Pseudoexfoliation Glaucoma ◽  
The Mean ◽  
Nerve Fibre Layer

Abstract Purpose To compare the blood flow situation in primary open-angle glaucoma (POAG) and pseudoexfoliation glaucoma (PXG) using optical coherence tomography angiography (OCTA). Methods In this prospective study a total of 26 POAG and 23 PXG eyes were included. All patients underwent a complete ophthalmological examination including standard automated perimetry, stereoscopic photographs of the optic disc, peripapillary retinal nerve fibre layer analysis and examination of vascular parameters of the optic nerve head (ONH), the peripapillary region and macula using OCTA. In addition to the vascular parameters recorded by the device, the vascular images were graphically evaluated using Image J. All recorded vascular parameters were compared between both groups and correlated to structural and functional parameters. Results The mean superficial perifoveal plexus perfusion density (PD) was significantly lower in PXG eyes than compared to POAG eyes using OCTA (32.57% ± 3.57% vs. 34.92% ± 2.11%, p = 0.007). The mean PD parameters for the superficial peripapillary plexus (40.98% ± 3.04% vs. 42.09% ± 2.29%, p = 0.152) as well as the size of the foveal avascular zone (FAZ) (0.23 mm2 ± 0.1 mm2 vs. 0.23 mm2 ± 0.09 mm2) did not differ between both groups. Additional graphic evaluation using Image J showed no significant difference for superficial perifoveal plexus PD (32.97% ± 1.11% vs. 33.35% ± 0.95%, p = 0.194) and peripapillary plexus PD (46.65% ± 0.83% vs. 46.95% ± 0.5%, p = 0.127) between the groups. Retinal nerve fibre layer (RNFL) thickness correlated significantly with peripapillary plexus PD for both OCTA data and Image J data (p < 0.001, p = 0.032). Conclusion The severity of the glaucoma seems to be crucial for peripapillary and macular perfusion densities, and not the form of glaucoma. An additional graphic evaluation is a possible step that could be implemented to improve the comparability of OCTA scans and to optimize the possibility of quantitative perfusion analysis in the case of deviating quality criteria.

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