Table 1.
Reliability and validity of the CHI-NEI-VFQ-25 subscales
| Subscale | Number of items | Cronbach α | Convergent validity | Discriminant validity |
|---|---|---|---|---|
| General health | 1 | NA | NA | NA |
| General vision | 1 | NA | NA | NA |
| Ocular pain | 2 | 0.872 | 100 | 100 |
| Near vision activities | 3 | 0.863 | 100 | 100 |
| Distance vision activities | 3 | 0.853 | 100 | 100 |
| Social function | 2 | 0.866 | 100 | 100 |
| Mental health | 4 | 0.807 | 100 | 100 |
| Role difficulty | 2 | 0.982 | 100 | 100 |
| Dependence | 3 | 0.886 | 100 | 100 |
| Driving | 3 | 0.586 | 100 | 100 |
| Color vision | 1 | NA | NA | NA |
| Peripheral vision | 1 | NA | NA | NA |
CHI-NEI-VFQ-25, Chinese version of the National Eye Institute Visual Function Questionnaire-25
NA, not applicable for subscales with only one item