| over time | 5 | temporal |
| condition → cause → blindness | 6 |
| condition → lead to → blindness | 5 |
| condition → be → leading cause of blindness | 3 |
| condition → result in → blindness | 3 |
| negative | neutral | positive |
| 0.872 | 0.114 | 0.013 |
| Raw frequency | 17 |
| Normalized frequency | 0.521 |
| Modifier score | 0.500 |
| Perplexity | 137.937 |