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Retinal nerve fiber layer evaluation in multiple sclerosis with spectral domain optical coherence tomography

Authors Khanifar AA, Parlitsis GJ, Ehrlich JR, Aaker GD, D’Amico DJ, Gauthier SA, Kiss S

Published 14 September 2010 Volume 2010:4 Pages 1007—1013


Review by Single-blind

Peer reviewer comments 3

Aziz A Khanifar1, George J Parlitsis1, Joshua R Ehrlich1, Grant D Aaker1, Donald J D’Amico1, Susan A Gauthier2, Szilárd Kiss1
1Departments of Ophthalmology, 2Neurology, Judith Jaffe Multiple Sclerosis Center, Weill Cornell Medical College, New York, USA

Purpose: Histopathologic studies have reported retinal nerve fiber layer (RNFL) thinning in various neurodegenerative diseases. Attempts to quantify this loss in vivo have relied on ­time-domain optical coherence tomography (TDOCT), which has low resolution and requires substantial interpolation of data for volume measurements. We hypothesized that the significantly higher resolution of spectral-domain optical coherence tomography (SDOCT) would better detect RNFL changes in patients with multiple sclerosis, and that RNFL thickness differences between eyes with and without optic neuritis might be identified more accurately.
Methods: In this retrospective case series, patients with multiple sclerosis were recruited from the Judith Jaffe Multiple Sclerosis Center at Weill Cornell Medical College in New York. Patients with a recent clinical diagnosis of optic neuritis (less than three months) were excluded. Eyes with a history of glaucoma, optic neuropathy (other than multiple sclerosis-related optic neuritis), age-related macular degeneration, or other relevant retinal and/or optic nerve disease were excluded. Both eyes of each patient were imaged with the Heidelberg Spectralis® HRA + OCT. RNFL and macular thickness were measured for each eye using the Heidelberg OCT software. These measurements were compared with validated published normal values, and were modeled as linear functions of duration of disease. The odds of an optic neuritis diagnosis as a function of RNFL and macular thickness were calculated.
Results: Ninety-four eyes were prospectively evaluated using OCT. Ages of patients ranged from 26 to 69 years, with an average age of 39 years. Peripapillary RNFL thinning was demonstrated in multiple sclerosis patients; mean RNFL thickness was 88.5 µm for individuals with multiple sclerosis compared with a reported normal value of 97 µm (P < 0.001). Eyes with a history of optic neuritis had more thinning compared with those without optic neuritis (83.0 µm versus 90.5 µm, respectively, P = 0.02). No significant differences were observed in macular thickness measurements between eyes with and without optic neuritis, nor were macular thickness measurements significantly different from normal values. As a function of multiple sclerosis duration and controlling for age, RNFL thickness was decreased in patients with a duration of multiple sclerosis greater than five years compared with those with a duration less than or equal to one year (P = 0.008).
Conclusions: Patients with a history of multiple sclerosis had RNFL thinning that was detectable on SDOCT. Decreasing RNFL thickness in eyes with optic neuritis was found, and the odds of having optic neuritis were increased significantly with decreasing RNFL thickness. Average RNFL thinning with increasing duration of disease was an excellent predictor of a reported history of optic neuritis. SDOCT retinal imaging may represent a high-resolution, objective, noninvasive, and easily quantifiable in vivo biomarker of the presence of optic neuritis and severity of multiple sclerosis.

Keywords: multiple sclerosis, spectral-domain optical coherence tomography, optical ­coherence tomography, nerve fiber layer, nerve fiber layer thickness, optic neuritis

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