Mapping the visual field to the optic disc in normal tension glaucoma eyes1☆,
Section snippets
RNFL photography
The archive of RNFL photographs from the Normal Tension Glaucoma Clinic at Moorfields Eye Hospital was searched for examples of photographs with discrete (focal and wedge) RNFL defects and/or prominent nerve fiber bundles, the course of which could easily be traced. Sixty-nine photographs of 69 eyes (63 patients) satisfied these criteria. If photographs of both eyes of a single patient met the criteria, both eyes were included (six patients).
Nerve fiber layer photography had been performed as
Results
Fifty-two field test points were assigned values, representing all points in the 24-2 test grid, except those immediately above and below the ONH.
A median of 22, of a possible 69, values was assigned to each point (range, 4–58). The mean value for each point is shown in Figure 4. In general, central points and points in the arcuate bundles were assigned more values than peripheral points. The median standard deviation of assigned values was 7.2° (range, 2.6°–10.3°). No locations in particular
Discussion
The map relating visual field test points to positions at the ONH (Fig 4) is, to our knowledge, the first complete map to be derived from human RNFL images. It is compared with Wirtschafter et al’s map in Figure 6. The maps differ in two significant respects. The first is that paracentral and arcuate areas of the visual field are represented by sectors nearer the poles of the ONH in the map derived from this study and by sectors nearer the temporal horizontal meridian in Wirtschafter’s map. The
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D. F. Garway-Heath is funded by the BUPA Fellowship (Royal College of Ophthalmologists/BUPA) and the David Cole Travel Award (Glaucoma Society (UK & Eire)/Merck Sharp & Dohme).
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The authors have no proprietary interest in the development or marketing of any product or instrument mentioned in this article.