Table 3.
Median scores of each item and the Cronbach’s alpha of the subscale of the DEQS-Th when each item was deleted
| All items and subscales | Median score (range) | Cronbach’s alpha | ||
|---|---|---|---|---|
| Frequencya | Degreeb | Frequency | Degree | |
| Bothersome Ocular Symptoms | ||||
| 1. Foreign body sensation | 1.0 (0–3) | 1.0 (0–4) | 0.75 | 0.67 |
| 2. Dry sensation in eyes | 0.5 (0–3) | 0.5 (0–2) | 0.70 | 0.58 |
| 3. Painful or sore eyes | 0.0 (0–2) | 0.0 (0–2) | 0.79 | 0.65 |
| 4. Ocular fatigue | 0.5 (0–3) | 0.5 (0–2) | 0.74 | 0.61 |
| 5. Heavy sensation in eyelids | 0.0 (0–3) | 0.0 (0–2) | 0.80 | 0.74 |
| 6. Redness in eyes | 0.0 (0–1) | 0.0 (0–2) | 0.79 | 0.66 |
| Impact on Daily Life | ||||
| 7. Difficulty opening eyes | 0.0 (0–2) | 0.0 (0–2) | 0.89 | 0.89 |
| 8. Blurred vision when watching something | 1.0 (0–4) | 1.5 (0–4) | 0.86 | 0.87 |
| 9. Sensitivity to bright light | 0.5 (0–3) | 0.5 (0–3) | 0.88 | 0.88 |
| 10. Problems with eyes when reading | 1.0 (0–4) | 1.5 (0–4) | 0.87 | 0.87 |
| 11. Problems with eyes when watching television, looking at a computer or using a cell phone | 1.0 (0–3) | 1.0 (0–3) | 0.86 | 0.87 |
| 12. Feeling distracted because of eye symptoms | 0.0 (0–2) | 0.0 (0–2) | 0.88 | 0.88 |
| 13. Eye symptoms affecting work | 0.0 (0–3) | 0.0 (0–3) | 0.87 | 0.88 |
| 14. Not feeling like going out because of eye symptoms | 0.0 (0–2) | 0.0 (0–2) | 0.89 | 0.90 |
| 15. Feeling depressed because of eye symptoms | 0.0 (0–2) | 0.0 (0–2) | 0.89 | 0.90 |
a Range from 0 (not at all) to 4 (always), and b Range from 0 (not at all) to 4 (very much)