Adjusted Peripapillary Retinal Nerve Fiber Layer Thickness Measurements Based on the Optic Nerve Head Scan Angle

2010 ◽  
Vol 51 (8) ◽  
pp. 4067 ◽  
Author(s):  
Samin Hong ◽  
Chan Yun Kim ◽  
Gong Je Seong
Keyword(s):  
Optic Nerve ◽  
Nerve Fiber ◽  
Layer Thickness ◽  
Retinal Nerve Fiber Layer ◽  
Optic Nerve Head ◽  
Fiber Layer ◽  
Nerve Fiber Layer ◽  
Nerve Fiber Layer Thickness ◽  
Thickness Measurements ◽  
Retinal Nerve Fiber

scholarly journals The influence of corneal astigmatism on retinal nerve fiber layer thickness and optic nerve head parameter measurements by optical coherence tomography

QJM ◽  
2020 ◽  
Vol 113 (Supplement_1) ◽  
Author(s):  
S M M S Ahmed ◽  
N H Abdallah ◽  
L S Eliwa ◽  
A M Bayomy
Keyword(s):  
Optic Nerve ◽  
Nerve Fiber ◽  
Layer Thickness ◽  
Retinal Nerve Fiber Layer ◽  
Optic Nerve Head ◽  
Corneal Astigmatism ◽  
Fiber Layer ◽  
Nerve Fiber Layer ◽  
Nerve Fiber Layer Thickness ◽  
Retinal Nerve Fiber

Abstract Background Astigmatism is a worldwide common ocular disorder. Total astigmatism is mainly driven by corneal astigmatism (CA), which occurs due to an irregular shape of the cornea. In eyes with astigmatism, retinal images can be distorted, and the image size could vary according to the axis of astigmatism assessed with computer-based methodology in astigmatic eyes. Objective to evaluate the influence of corneal astigmatism on the RNFL thickness and ONH parameters obtained by spectral-domain OCT. Patients and Methods 40 patient chosen from outpatient ophthalmology of Ain Shams University Hospitals and Om El¬_Massrein General Hospital and classified in two groups, the study group (high astigmatic patients ≥ 3 diopter) and control group (normal astigmatism< 3 diopter) with no significant change in the age and sex. All cases were free of any ocular diseases with no past history of medical importance (DM, HTN or any neurological diseases), all this cases never had any previous refractive surgery or any retinal lesion. Results In this study all cases had average IOP > 21 mmhg, and randomly selected from the outpatient clinic. The study group had thinner retinal nerve fiber layer in temporal quadrant and larger disc area than the control group. These study support the concept that corneal astigmatism has an effect on retinal nerve fiber layer thickness and optic nerve head parameters. Conclusion In our study, we compare between the OCT pattern of retinal nerve fiber layer thickness (total, superior, nasal and inferior quadrants) and the optic nerve head parameters (cup area, disc area, vertical and horizontal C/D ratio) in the high astigmatic patients (≥ 3 diopter) and normal astigmatism < 3 diopter.

scholarly journals Evaluation of the optic nerve head and peripapillary retinal nerve fiber
layer thickness in patients receiving Electro-Convulsive Therapy

2017 ◽  
Vol 4 (12) ◽  
pp. 1885-1897 ◽  
Author(s):  
Kourosh Shahraki ◽  
Alireza Khosravi ◽  
Shiva Kaffashipour ◽  
Kianoush Shahraki ◽  
Masoud Sadeghi
Keyword(s):  
Optic Nerve ◽  
Nerve Fiber ◽  
Layer Thickness ◽  
Retinal Nerve Fiber Layer ◽  
Optic Nerve Head ◽  
Normal Range ◽  
Fiber Layer ◽  
Nerve Fiber Layer ◽  
Nerve Fiber Layer Thickness ◽  
Retinal Nerve Fiber

Background: Electroconvulsive therapy (ECT) is a method commonly used in the treatment of psychiatric disorders. As ocular side effects from OCT are less studied and discussed, the aim of this study was to evaluate the profile of the peripapillary retinal nerve fiber layer thickness in patients receiving ECT. Method: This study was performed on 30 patients who had indication for ECT. After recording demographic data, retinal nerve fiber layer thickness was measured by using spectral domain optical coherence tomography (Heidelberg Engineering, Heidelberg, Germany) of optic nerve head and peripapillary retinal nerve fiber layer. Results: Our results showed that for most of the studied variables, the normal range was observed in less than 85% of patients receiving ECT. Variables which were outside the normal range were: cup disk (C/D) ratio (right and left eyes were 50% and 46.7%, respectively), vertical C/D ratio (right and left eyes were 53.3% and 46.7%, respectively), and cup volume (right and left eyes were 53.3% and 33.3%, respectively). Conclusion: This study showed that a high percentage of patients receiving ECT had changes in the optic nerve head while intra-ocular pressure in these patients was normal. It is warranted for examiners to pay attention to diagnosis of normal tension glaucoma in patients receiving ECT.

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