Table 4 Internal consistency at baseline and test-retest reliability of NEI-VFQ 25 in patient and control group
NEI-VFQ 25 | Number of items | Cronbach’s Alpha in patients (N = 175) | ICC in patients (N = 31) | ICC in controls (N = 21) |
|---|---|---|---|---|
General Health | 1 | NA | 0.64 | 0.78 |
General vision | 1 | NA | 0.51 | 0.72 |
Ocular Pain | 2 | 0.64 | 0.91 | 0.89 |
Near activities | 3 | 0.74 | 0.87 | 0.65 |
Distance activities | 3 | 0.77 | 0.90 | 0.68 |
Social Function | 2 | 0.66 | 0.93 | 0.83 |
Mental health | 4 | 0.69 | 0.80 | 0.65 |
Role difficulties | 2 | 0.78 | 0.49 | 0.92 |
Dependency | 3 | 0.76 | 0.75 | 0.59 |
Driving | 2 | 0.61 | 0.97 | 0.97 |
Color vision | 1 | NA | 0.89 | −0.11 |
Peripheral vision | 1 | NA | 0.96 | 0.60 |
25-item composite | 25 | 0.85 | 0.91 | 0.96 |