| to remove cataracts | 3 | purpose |
| invention → relate to → laser | 5 |
| invention → use → a laser beam | 3 |
| invention → encompassed → laser | 3 |
| invention → use → laser | 3 |
| negative | neutral | positive |
| 0.040 | 0.688 | 0.271 |
| Raw frequency | 14 |
| Normalized frequency | 0.203 |
| Modifier score | 0.500 |
| Perplexity | 111.861 |