Relationship between indices of Frequency Double Technique perimetry and Octopus perimetry in Glaucoma

Objective To investigate the correlation between the indices of Frequency Doubling Technique(FDT) perimeter and Octopus perimeter in patients with primary open-angle glaucoma(POAG),normal tension glaucoma(NTG),suspected glaucoma,or normal.Methods 35 normal,27 glaucoma suspected,37 patients with POAG and 50 patients with NTG were examined with the N-30 program of FDT and dG2 program of Octopus.The correlation between MD(FDT-MD)or pattern standard deviation PSD(FDT-PSD) and MD (Octopus-MD) or loss variance LV(Octopus-LV) were evaluated using linear regression analysis.Results Overall,FDT-MD and FDT-PSD significantly related with Octopus-MD(r=0.88,P0.001)and Octopus-LV(r=0.862,P0.001).In POAG,FDT-MD and FDT-PSD significantly correlated with octopus-MD(r=0.828,P0.001)and Octopus-LV(r=0.758,P0.001).In NTG,FDT-MD and FDT-PSD also significantly correlated with Octopus-MD(r=0.827,P0.001)and Octopus-LV(r=0.783,P0.001).Significant difference was found between FDT and Octopus for the time needed to perform the visual field test.Conclusions The indices of FDT significantly correlated with the indices of Octopus both in POAG and NTG.FDT could be used in screening and diagnosis of glaucoma.The FDT is a faster way to analyze the visual field.