Purpose: We aimed to determine prospectively the incidence of abnormal test results on frequency doubling perimetry (FDT), the nerve fibre analyser (GDx) and standard automated perimetry (SAP) in a cohort of glaucoma suspect patients with normal findings for all these tests at baseline. Methods: Seventy glaucoma suspect patients were followed prospectively for 4 years with SAP (Humphrey field analyser 30-2 SITA Fast), FDT (C-20 full-threshold) and GDx (Version 2.010) in a clinical setting. All patients had normal baseline test results on SAP, FDT and GDx. After the follow-up period, the number of patients who converted (whose test results changed from normal at baseline to reproducibly abnormal during follow-up) were counted for each technique and then compared. The cut-off point for FDT was > 1 depressed test-point p < 0.01 in the total deviation probability plot; the cut-off point for GDx was the Number > 29. Results: Of the 70 glaucoma suspect patients, three converted on FDT, 14 on GDx and six on SAP. These proportions are significantly different for GDx versus SAP (p = 0.033) and GDx versus FDT (p = 0.002), but not for FDT versus SAP (p = 0.256). Conclusions: The most frequent finding after a 4-year follow-up was conversion on GDx.

Frequency doubling perimetry (FDT), GDx, Glaucoma, Glaucoma suspect, Perimetry, Scanning laser polarimetry
dx.doi.org/10.1111/j.1755-3768.2008.01279.x, hdl.handle.net/1765/24869
Acta Ophthalmologica (Print)
Erasmus MC: University Medical Center Rotterdam

Jansonius, N.M, & Heeg, G.P. (2009). The Groningen Longitudinal Glaucoma Study. II. A prospective comparison of frequency doubling perimetry, the GDx nerve fibre analyser and standard automated perimetry in glaucoma suspect patients. Acta Ophthalmologica (Print), 87(4), 429–432. doi:10.1111/j.1755-3768.2008.01279.x