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 |