Table 1. Summary of the rats used and the study design.
| Method | Group | Number of rats |
| H&E, gamma synuclein, TUNEL | Sham | 6 |
| Placebo | 6 | |
| H2 | 6 | |
| PLR, FVEP, CTB | Sham | 6 |
| Placebo | 6 | |
| H2 | 6 | |
| MDA | Sham | 6 |
| Placebo | 6 | |
| H2 | 6 |
H&E, hematoxylin and eosin staining; gamma synuclein, immunohistochemical staining of gamma synuclein; TUNEL, terminal-deoxy-transferase-mediated dUTP nick end labeling; PLR, pupillary light reflex; FVEP, flash visual evoked potential; CTB, FITC-conjugated cholera toxin B tracing; MDA, malondialdehyde assay.