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Central retinal vessel trunk position affects visual field pattern in advanced glaucoma
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Perimetric loss patterns correlated with the position of the central retinal vessel trunk in a study of end-stage glaucoma patients.
The observational study compared the position of the central retinal vessel trunk (CRVT) in 21 patients with remaining central visual field island and 22 patients with remaining temporal visual field.
Retinal nerve fiber layer measured by RTVue Fourier-domain optical coherence tomography (Optovue) was significantly thicker in the temporal region (48.1 ± 5.5 µm vs. 37.2 ± 7.9 µm; P < .001) and thinner in the nasal region (41.6 ± 8.3 µm vs. 48.0 ± 7.8 µm; P = .01) in patients in the central visual field group.
Also in the central visual field island group, the CRVT exit was found in six patients, whereas the CRVT exit was found in no patients in the central visual field group; the difference was statistically significant (P = .009).
“The results agree with the notion that an optic disc region with a short distance to the CRVT may be associated with a decreased risk of glaucomatous RNFL loss and of glaucomatous visual field defects,” the authors said.
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