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Table 2 One year prevalence of CVS symptoms lasting for at least one week during the previous year and severity

From: Computer vision syndrome among computer office workers in a developing country: an evaluation of prevalence and risk factors

  N All prevalence  % (95 % CI) (n = 2210) Males prevalence % (95 % CI) (n = 1122) Females prevalence % (95 % CI) (n = 1088) p value*
Pain in and around the eyes 634 28.7 (26.8–30.6) 27.8 (25.2–30.5) 29.6 (26.9–32.4) NS
Headache 1010 45.7 (43.6–47.8) 38.1 (35.2–41.0) 53.5 (50.5–56.5) <0.05
Blurred near vision 526 23.8 (22.0–25.6) 24.6 (22.1–27.2) 23 (20.5–25.6) NS
Blurred distant vision 444 20.1 (18.4–21.8) 19.6 (0.4–40.5) 20.6 (18.2–23.1) NS
Dry eyes 688 31.1 (29.1–33.1) 30.8 (28.1–33.6) 31.4 (28.7–34.3) NS
Sore/irritated eyes 578 26.2 (24.4–28.1) 25.3 (22.8–27.9) 27 (24.4–29.8) NS
Red eyes 400 18.1 (16.5–19.8) 21.9 (19.5–24.5) 14.2 (12.1–16.4) <0.05
Excessive tearing 460 20.8 (19.1–22.6) 23.2 (20.7–25.8) 18.4 (16.1–20.8) <0.05
Double vision 302 13.7 (12.3–15.2) 15 (12.9–17.2) 12.3 (10.4–14.4) NS
Twitching of eye lids 452 20.5 (18.8–22.2) 21 (18.7–23.5) 19.9 (17.6–22.5) NS
Changes in visualizing colours 206 9.3 (8.1–10.6) 12.7 (10.8–14.7) 5.9 (4.6–7.5) <0.05
Severity of CVS
 Mild-moderate cases 300 42.1 (39.1–45.3) 44.7 (40.4–49.5) 55.3 (49.7–60.9) <0.05
 Severe cases 412 57.9 (54.7–60.9) 54.9 (50.0–59.6) 45.1 (39.1–50.3) NS
  1. CVS computer vision syndrome, NS not significant, N number of subjects with complaints
  2. * p value for males vs. females