Correlation between Optic Disc Tomography and Frequency Doubling Technology in Glaucoma Suspect

ABSTRACT

PURPOSE: To evaluate the relationship between results obtained by Heidelberg Retina Tomography (HRT) and frequency-doubling technology (FDT) in glaucoma suspect. METHODS: A total of 24 patients with glaucoma suspect were included in this study. Each subject underwent 2 visual field tests (Humphrey central 30-2 and FDT N-30), a comprehensive ophthalmic examination, and HRT upon each eye. RESULTS: A comparison of FDT global indices with the parameters of HRT, MD and PSD of FDT showed no correlation with HRT parameters. However, there was a significant correlation between the number of abnormal points in FDT and the following HRT parameters cup-disc area ratio, rim volume, mean nerve fiber layer thickness, retinal nerve fiber layer cross sectional area, and classification (p<0.05). When comparing the group having two or less abnormal points by FDT to the group having three or more abnormal points by FDT, differences were found in the following HRT parameters disc area, cup-disc area ratio, rim volume, cup shape measure, mean nerve fiber layer thickness, nerve fiber layer cross sectional area, and classification (p<0.05). CONCLUSIONS: Significant correlations were found between the number of abnormal points in FDT and HRT parameters. We believe that the correlations between the results of FDT and HRT parameters in preperimetric glaucoma with normal achromatic visual field suggest that FDT may be used for early diagnosis in patients with glaucoma.