Assessment of fundus oriented perimetry in glaucoma
M. Flad, T. J. Dietrich, F. Stumpp, A. Schuster, D. Neumann, U. Schiefer
Purpose: For quantitative assessment of glaucomatous visual fields (VF), these are usually represented by one numerical value ("VF index"). The aim of this study was to compare the "CIGTS-score" (Collaborative Inter-ventional Glaucoma Treatment Study), as an example of a censored scale, with the new, continuously scaled perimetric index "defect volume" (DV).
Methods: VF were examined with Fundus Oriented Perimetry (FOP) using individual test point grids with locally condensed stimulus arrangement in morphologically conspicuous areas of the fundus three times (0,6,12 months). The results were evaluated with a CIGTS-score modified for FOP. Additionally, the DV was calculated as deviation from age-related normal VF.
Subjects: We examined 47 glaucoma patients or suspects (14 to 78 years); 21 of which were under local Carboanhydraseinhibitor (CAI) treatment, 26 did not receive CAI. Inclusion criteria: visual acuity > 10/20; refractive error sph < 6dpt, cyl < 3dpt; visual field stage 0-3 according to the Aulhorn classification; no other relevant ocular pathology; no use of miotic drugs.
Results: Unanimously for both scoring methods, 30 patients (63.8%) showed stable VF during the examination period of approximately one year. Three patients showed VF defect progression, two irregular VF courses, whereas one patient seemed to improve concerning VF defects. Different results in both scoring methods were found in the 11 VF left, and DV tends to progression, while CIGTS rather tends to an irregular course.
Conclusions: The defect Volume scoring method, which is impartial to the shaping and size of scotomata, seems to be a good completion to other scoring system like CIGTS.
Under support of MSD Sharpe & Dohme, Haar
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