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Evaluation of the Optic Nerve and Retinal Nerve Fiber Layer in Myopic Individuals

Published Online: June 21st 2012 US Ophthalmic Review, 2012;5(2):91-3 DOI: http://doi.org/10.17925/USOR.2012.05.02.91
Authors: Ahmad A Aref, Donald L Budenz
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Abstract:
Overview

Clinical discrimination between myopic tilted optic discs and glaucomatous optic neuropathy is often challenging, especially when considering that myopia is a risk factor for the development of glaucoma. Myopic tilted discs are usually larger than average, with associated relative cupping and thinner neuroretinal rim tissue. Histopathologic study has revealed thinner parapapillary retinal tissue in these eyes. Optical coherence tomography (OCT)-measured average retinal nerve fiber layer (RNFL) thickness has been found to decrease with longer axial length and higher myopic refractive error. Parapapillary RNFL quadrant and clock-hour analyses result in a higher false-positive rate in myopic eyes. Careful slit-lamp examination, quality baseline stereoscopic disc photographs, and frequent serial visual field testing are essential to the follow-up of myopic individuals with suspected glaucoma. A novel diagnostic parameter, OCT-derived ganglion cell analysis, may prove to be useful in the diagnosis and follow-up of these individuals.

Keywords

Retinal nerve fiber layer, myopia, glaucoma, optical coherence tomography, optic nerve

Article:

According to pooled data from large, population-based eye surveys, the estimated prevalence of myopic refractive error (-1 diopter [D] or less) in individuals >40 years old is 25.4, 26.6, and 16.4 % in the US, Europe, and Australia, respectively. For myopia less than -5 D, the prevalence estimates are 4.5, 4.6, and 2.8 %, respectively.1 The prevalence of myopic refractive error is indeed substantial and is the highest of any ocular disorder in this age group.

Furthermore, optic nerve and visual field abnormalities associated with high myopia are notoriously difficult to differentiate from those associated with glaucomatous optic neuropathy. The challenge of distinguishing otherwise healthy myopic eyes from those afflicted with glaucoma becomes even more complex when considering that myopic refractive error is a risk factor for open-angle glaucoma. Marcus and colleagues2 performed a systematic review and meta-analysis of population-based cross-sectional studies published between 1994 and 2010, in order to determine the association between myopia and glaucoma. Analysis of seven studies that reported risk estimates for both low and high myopia revealed a pooled odds ratio of 1.65 (95 % confidence interval [CI] 1.26–2.17) between low myopia and open-angle glaucoma. The pooled odds ratio for the association between high myopia (-3 D or less) and open-angle glaucoma was found to be 2.46 (95 % CI 1.93–3.15). The authors acknowledge that, due to the presence of myopic visual field defects and relatively larger optic nerve cups in myopic individuals, studies included in this meta-analysis may have overestimated the prevalence of glaucoma and therefore they cite a single longitudinal study3 (deemed to be less prone to misdiagnosis of glaucoma) that yielded the same overall results. High myopic error does indeed appear to be an independent risk factor for open-angle glaucoma; however, clinicians must be aware of myriad clinical features that may confound an accurate diagnosis. This article aims to shed light on these clinical features and also to provide practical tips for the examination and follow-up of myopic individuals with suspected open-angle glaucoma.

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Disclosure

The authors have no conflicts of interest to declare.

Correspondence

Donald L Budenz, MD, MPH, Department of Ophthalmology, University of North Carolina School of Medicine, 5151 Bioinformatics, CB 7040, Chapel Hill, NC 27599-7040, US. E: dbudenz@med.unc.edu

Received

2011-10-11T00:00:00

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