Table 1.
Participant Demographics
| S1 | S2 | S3 | |
|---|---|---|---|
| Gender | Male | Male | Female |
| Age at baseline (years) | 47 | 63 | 66 |
| Eye condition | Retinitis pigmentosa (rod cone dystrophy) | Retinitis pigmentosa (rod cone dystrophy) | Retinitis pigmentosa (cone rod dystrophy) |
| Observed nystagmus | Mild, constant | Mild, intermittent | None |
| Visual acuity | Light perception OU | Light perception OU | Light perception OU |
| ffERG stimulus light threshold (cd.s/m2) | 0.1 | 0.1 | 0.001 |
| Age when legally blind | 20 | 34 | 41 |
| Years of useful form vision | 34 | 43 | 56 |
| Primary mobility aid | Cane | Cane | Guide dog |
| Implanted eye | Left | Right | Right |
ffERG, full-field electroretinogram.
Nystagmus was rated on a 4-point scale (none, mild, moderate, severe) and assessed for whether it was constant or intermittent in primary position (looking straight ahead) by an experienced clinician.