Correlación entre el espesor de la capa de fibras nerviosas y el campo visual

Laburpena

Purpose: To determine the correlation between the nerve fiber layer thickness measured with laser polarimetry and the visual field using the Delphi perimetry. Methods: 44 eyes from 25 primary open angle glaucoma patients were studied. The NFLT was measured using the Nerve Fiber Analyser (GDx). A 10 pixel width ring of 1.75 disc diameter centred on the optic disc was used. Three 15º images were obtained and then the baseline imaged calculated. The total thickness and thickness of four 90° quadrants (superior, inferior, nasal and temporal) was considered. We also calculated the mean thickness of the superior and inferior quadrants (MT SQ-IQ). The mean sensibility of the visual field and the threshold values of the four critical point of the Delphi perimetry were used to correlate with the nerve fiber layer measurements. Results: Mean total NFLT was 56.87 DS 12.89 µm and mean NFLT of the superior and inferior quadrants was 65.35 DS 17.97µm (MT SQ-IQ). Mean sensibility (MS) of the visual field was 20.01 DS 9.11 Db. Significant correlation (p>0.001) was found between the MS and the MT SQ-IQ (r: 0.6687), the MS of the four critical points and the MT SQ-IQ (r: 0.6779), and the individual critical points sensibility and the corresponding NFLT area. Conclusion: The nerve fiber layer thickness measured with the GDx significantly correlates with the Delphi perimetry in glaucoma patients.