G A Hahn, P Biermann, J Reinhard, S Trauzettel-Klosinski
University Eye Hospital, Low Vision Department, Tuebingen, Germany
Purpose : Manual perimetry provides topographical assignment of visual field defects. The Macular Mapping Test (MM-Test, San Francisco) was designed to map remaining vision of the central visual field in a quick, easy and cost-effective manner. We examined the two methods regarding their correspondence in patients with macular vision loss. Methods : 50 patients (19 male, 31 female, mean age of 56 +/- 22 years) were examined. Inclusion criteria were: macular degeneration, central scotoma and visual acuity beyond 20/400 (0,05). 30° Tübingen manual perimetry (TMP) was performed kinetically. The mapping test assesses local responses to brief displays of letter targets in the central visual field (8 deg. radius) on a computer screen. It uses a set of 8 radial landmarks to stabilize gaze without foveal fixation. Comparison of the techniques was based on the degree of correspondence of the field defects in each sector. Results : In general, we found high correspondence (82%) of number and extent of the visual field defects between both methods. Best correspondence (95%) was found in patients with central fixation, lower correspondence (78%) in patients with eccentric fixation, which was documented by Scanning Laser Ophthalmoscope. Conclusion : Provided that fixation behavior is known, the Macular Mapping Test is a quick and easy screening method that provides data of high correspondence with standard visual field testing. Supported by "Fortüne" intramural research program, University of Tuebingen (F1222406 to S. T-K.)
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