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For discrepancies between eyes, averages were used. For discrepancies between parameters, 2 out of 3 determined the category. μV= microvolt.
| Category | Rod amplitude range (μV) | Cone amplitude range (μV) | HVF horizontal diameter (°) |
|---|---|---|---|
| Unaffected/Mild | >100 | >50 | >30 |
| Moderate | 30–100 | 20–50 | 10–30 |
| Severe | <30 | <20 | <10 |
