CVS symptoms | Device use time | ||||||
---|---|---|---|---|---|---|---|
1–3 h | 4–6 h | > 6 h | Correlation coefficient | ||||
N | Percentage (%) | N | Percentage (%) | N | Percentage (%) | ||
Dry eyes | |||||||
No effect | 40 | 20 | 21 | 15 | 30 | 11 | 0.263** |
Mild | 15 | 8 | 13 | 7 | 26 | 13 | |
Moderate | 3 | 2 | 20 | 10 | 26 | 13 | |
Severe | 1 | 1 | 1 | 1 | 1 | 1 | |
Red and Irritated eyes | |||||||
No effect | 35 | 18 | 18 | 9 | 23 | 12 | 0.279** |
Mild | 18 | 9 | 14 | 7 | 28 | 14 | |
Moderate | 4 | 2 | 16 | 8 | 22 | 11 | |
Severe | 2 | 1 | 7 | 4 | 10 | 5 | |
Neck and Shoulder pain | |||||||
No effect | 35 | 18 | 11 | 6 | 16 | 8 | 0.339** |
Mild | 13 | 7 | 19 | 10 | 26 | 13 | |
Moderate | 10 | 5 | 18 | 9 | 28 | 14 | |
Severe | 1 | 1 | 7 | 4 | 13 | 7 | |
Headache | |||||||
No effect | 3 | 18 | 13 | 7 | 23 | 12 | 0.248** |
Mild | 13 | 7 | 25 | 13 | 30 | 15 | |
Moderate | 9 | 5 | 12 | 6 | 19 | 10 | |
Severe | 2 | 1 | 5 | 3 | 11 | 6 | |
Eye strain and feeling tired | |||||||
No effect | 41 | 21 | 6 | 3 | 16 | 8 | 0.400** |
Mild | 10 | 5 | 26 | 13 | 24 | 12 | |
Moderate | 6 | 3 | 17 | 9 | 35 | 18 | |
Severe | 2 | 1 | 6 | 3 | 8 | 4 | |
Blurred vision | |||||||
No effect | 32 | 16 | 15 | 8 | 22 | 11 | 0.238**a |
Mild | 31 | 12 | 34 | 24 | 47 | 16 | |
Moderate | 3 | 2 | 8 | 4 | 12 | 6 | |
Severe | 0 | 0 | 2 | 1 | 1 | 1 |