| previously | 3 | temporal |
| in 2002 | 2 | temporal |
| patient → have → lasik | 8 |
| patient → undergo → lasik | 7 |
| patient → had → lasik | 7 |
| patient → consider → lasik | 5 |
| negative | neutral | positive |
| 0.267 | 0.596 | 0.138 |
| Raw frequency | 27 |
| Normalized frequency | 0.386 |
| Modifier score | 0.700 |
| Perplexity | 81.469 |