|
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
|
- a,**Correlation coefficient for the Pearson-spearman significance at the p = 0.01(2-tail)
