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Table 4 CVS symptoms and correlation with the device used

From: Prevalence rate of attention deficit hyperactivity disorder (ADHD) and computer vision syndrome (CVS) symptoms predisposition among digital device users of Bangladesh

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