Table 1 Demographic characteristics of study participants 

Gender

 Females

999 (69.8%)

739 (72.6%)

260 (63.0%)

Age category

 18–20 years

389 (27.2%)

312 (30.6%)

77 (18.6%)

 21–23 years

510 (35.6%)

378 (37.1%)

132 (32.0%)

 24–26 years

296 (20.7%)

201 (19.7%)

95 (23.0%)

 27–29 years

129 (9.0%)

79 (7.8%)

50 (12.1%)

 30 years and above

107 (7.5%)

48 (4.7%)

59 (14.3%)

Field of study

 Medical college

751 (52.5%)

508 (49.9%)

243 (58.8%)

Marital status

 Single

1131 (79.0%)

823 (80.8%)

308 (74.6%)

 Married

274 (19.1%)

181 (17.8%)

93 (22.5%)

 Divorced

23 (1.6%)

12 (1.2%)

11 (2.7%)

 Widowed

3 (0.2%)

2 (0.2%)

1 (0.2%)

Year of study

 First year

231 (16.1%)

196 (19.3%)

35 (8.5%)

 Second year

291 (20.3%)

238 (23.4%)

53 (12.8%)

 Third year

248 (17.3%)

197 (19.4%)

51 (12.3%)

 Fourth year

308 (21.5%)

204 (20.0%)

104 (25.2%)

 Fifth year

102 (7.1%)

24 (2.4%)

78 (18.9%)

 Sixth year

23 (1.6%)

16 (1.6%)

7 (1.7%)

 Higher education

228 (15.9%)

143 (14.0%)

85 (20.6%)

Income level

 Less than 700 USD

982 (68.6%)

760 (74.7%)

222 (53.8%)

 700 – 1500 USD

302 (21.1%)

179 (17.6%)

123 (29.8%)

 1500 – 2000 USD

91 (6.4%)

58 (5.7%)

33 (8.0%)

 More than 2000 USD

56 (3.9%)

21 (2.1%)

35 (8.5%)

Do you suffer from any chronic conditions?

 Yes

107 (7.5%)

80 (7.9%)

27 (6.5%)

Contact lens user

 Yes

188 (13.1%)

142 (13.9%)

46 (11.1%)

Screen time (mobile, television, laptop, etc.…) (hours/day)

 Less than 2 h

40 (2.8%)

30 (2.9%)

10 (2.4%)

 2–4 h

155 (10.8%)

116 (11.4%)

39 (9.4%)

 4–6 h

370 (25.9%)

240 (23.6%)

130 (31.5%)

 6–8 h

396 (27.7%)

292 (28.7%)

104 (25.2%)

 8 h and above

470 (32.8%)

340 (33.4%)

130 (31.5%)