| to normal vision | 12 | other |
| along with the lens | 7 | other |
| very | 3 | degree |
| cornea → be → important | 8 |
| cornea → be → essential | 7 |
| cornea → be → critical | 4 |
| cornea → be → vital | 3 |
| negative | neutral | positive |
| 0.061 | 0.558 | 0.381 |
| Raw frequency | 22 |
| Normalized frequency | 0.467 |
| Modifier score | 0.500 |
| Perplexity | 112.152 |