Table 1
Electrophysiological staging using the results of multifocal ERG and photopic Ganzfeld ERG
| Classes | Description | No of eyes |
|---|---|---|
| I | Subnormal multifocal ERGs only in groups 1 and 2 (0°–7°) | 7 |
| II | Subnormal multifocal ERGs in groups 1-3 (0°–12°) | 56 |
| III | Subnormal ERGs in the entire test field (0°–30°), but normal Ganzfeld ERG | 10 |
| IV | Subnormal ERGs in the entire test field (0°–30°) plus pathological Ganzfeld ERG | 14 |
| V | Atypical forms | 2 |
| No defect detectable using the multifocal ERG | 4 |
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Ninety three eyes of 47 patients were analysed. (Eight eyes of four patients with subnormal results in the entire test field in multifocal ERG have not been assessed by photopic Ganzfeld ERG. These patients were omitted in the analysis.)
