Correlation between lateral geniculate nucleus atrophy and damage to the optic disc in glaucoma

Abstract

Purpose: To investigate the relationship between morphological changes in the lateral geniculate nucleus (LGN), as measured by magnetic resonance imaging (MRI), and damage to the optic disc in primary open-angle glaucoma (POAG) patients.

Methods: A total of 23 patients with POAG and 23 age- and gender-matched non-glaucomatous subjects were enrolled. Every patient had structural damage to the optic disc. Cup-to-disc ratio (CDR) and retinal nerve fiber layer thickness (RNFLT) were measured, and 3.0-Tesla MRI examinations performed. Bilateral LGNs were identified and manually extracted, and their maximum heights and volumes compared with the clinical damage to the optic disc.

Results: In POAG patients, morphological changes in LGNs and RNFLT were consistently varied (P<0.05), while a negative correlation between LGN measurements and CDR was observed (P<0.05). LGN height was more significantly correlated with damage to the optic disc than was LGN volume. In contrast, no significant correlation was found between morphological changes in LGNs and age or optic disc parameters in the non-glaucomatous controls (P>0.05).

Conclusion: LGN atrophy in POAG patients was altered in a manner consistent with damage to the optic disc. Morphological changes in LGNs as measured by MRI and especially LGN maximum height may be useful ways to detect optic nerve neuropathy in glaucoma.

Keywords: Glaucoma; Lateral geniculate nucleus; Magnetic resonance imaging.