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Abstract #59064 Published in IGR 16-3

Asymmetry analysis of macular inner retinal layers for glaucoma diagnosis

Yamada H; Hangai M; Nakano N; Takayama K; Kimura Y; Miyake M; Akagi T; Ikeda HO; Noma H; Yoshimura N
American Journal of Ophthalmology 2014; 158: 1318-1329.e3

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PURPOSE: To determine if asymmetry in thickness of the retinal nerve fiber layer (RNFL), ganglion cell layer, ganglion cell complex, and total retina between upper and lower macula halves can predict glaucoma. DESIGN: Retrospective case-control series. METHODS: One hundred twenty-two eyes of 122 patients (30 normal eyes and 30 preperimetric, 31 early, and 31 advanced glaucoma eyes) were studied. The RNFL, ganglion cell layer, ganglion cell complex, and total retina were segmented and measured on 10 vertical B-scans over a 30 × 15 degree macular area. The equation asymmetry index =|log10 (lower hemiretinal thickness/upper hemiretinal thickness)| was used to calculate asymmetry indices for 8 pairs of upper and lower 0.5-mm segments equidistant from the fovea on each scan. Areas under the receiver operating characteristic curve (AROCs) for mean thickness and mean asymmetry index of 10 B-scans were compared. RESULTS: The overlap in values for normal and glaucomatous eyes was minimal for the ganglion cell layer asymmetry index. Thickness parameters decreased with the severity of glaucoma, whereas asymmetry indices did not. AROCs for thickness measurements tended to increase with increasing glaucoma severity (preperimetric, 0.746-0.808; early, 0.842-0.940; advanced, 0.943-0.995), whereas AROCs for asymmetry indices did not have distinct ranges according to glaucoma severity (advanced, 0.819-0.996; early, 0.861-0.998; preperimetric, 0.773-0.994). The AROC for the ganglion cell layer asymmetry index remained almost perfect regardless of glaucoma severity (0.994-0.998). CONCLUSIONS: Macular retinal layer thickness asymmetry indices, particularly for the ganglion cell layer, show promise as early indicators of glaucomatous retinal damage.

Department of Ophthalmology and Visual Sciences, Kyoto University Graduate School of Medicine, Kyoto, Japan.

Full article

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Classification:

2.13 Retina and retinal nerve fibre layer (Part of: 2 Anatomical structures in glaucoma)

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