| Objective: A survey of the relationship between dry eye prevalence and riskfactors among visual display terminal users of a company in Dalian, to further improvethe understanding of visual display terminal syndrome and to provide awareness forVDT operators on early detection, early diagnosis, early treatment and VDT workrelated eye disease prevention.Methods: Selected318VDT operators from a Dalian company.All of theminitially underwent eye examinations, followed by filling up of a questionnaire. Tearbreakup time measurement, inspection of the meniscus tear lake, sodium fluoresceinstaining and Schirmer’s test were carried out. All survey data were analyzed by the useof SPSS11.5software for statistical analysis, use P<0.05for statistical significance.Results:(1) A total number of318VDT users (636eyes) were surveyed. Theaverage age was35.34±10.38years old. The number of female VDT users was78,accounting for24.53%.240VDT users were male, accounting for75.46%; male tofemale ratio was3.08:1. The prevalence rate of dry eye was38.99%, including80males and44females (33.33%prevalence rate in males,56.41%prevalence rate infemales).The female prevalence rate was significantly higher than that in male. Onchi-squared analysis, the prevalence rate in males was statistically different compared tothat in females (χ2=13.178, P<0.05).(2) The subjective symptoms from the survey, indecreasing order of frequency were as follows: dry eye>eye fatigue> itching> eye pain> memory loss> blurred vision> tearing> headache and dizziness> insomnia> redeye> diplopia> loss of appetite> sensation.(3) The VDT operation time was dividedinto four groups:4h/d group,5~7h/d group,8~10h/d and>10h/d group. Dry eyeprevalence rate showed statistical difference at different VDT operation time, χ2=8.411, P <0.05. Comparison among groups showed that VDT users of≤4h/d wasstatistically different compared to VDT users of>10h/d（P=0.005＜0.00714）.Thelonger the VDT work duration, the higher the dry eye prevalence rate would be. The prevalence of dry eye among VDT users of≤4h/d was significantly lower than that inVDT users of>10h/d.(4) Dry eye was divided into three levels as mild, moderate andsevere according to the symptoms. The VDT operation time was divided into fourgroups:4h/d group,5~7h/d group,8~10h/d and>10h/d group. Different VDT worktime and different dry eye levels had statistical significance, χ2=26.690, P<0.05.Among the four groups, comparisons revealed that8~10h/d group and10h/d groupwhen compared with≤4h/d group, dry eye level showed significant statistical difference(P<0.05), dry eye level in both groups were higher than those of <4h/d group;>10h/dgroup when compared with5-7h/d group,dry eye level had significant statisticaldifference (P<0.05), dry eye level of>10h/d group was higher than that of5~7h/dgroup. The remaining groups had no statistical differences.Operation time and dry eyelevel were positively correlated（r=0.463, P<0.05）, i.e. when the work was of longerduration, dry eye was more serious.(5)In the investigation of the636eyes, BUT wasbetween0and10s in489eyes, accounting for76.89%; Schirmer ’s I test was≤10mm/5min in378eyes, accounting for59.43%; corneal staining was positive in362eyes,accounting for56.92%; meniscus tear lake abnormalities were present in152eyes,accounting for23.90%.(6) In the univariate logistic regression analysis comparing age,sex, length of service, VDT operation time, screen position, protective glasses and airconditioning as factors, there was statistical significance for age,sex, length of serviceand VDT operation time in the occurrence of dry eye (P <0.05). Female,age more than40years old, length of service more than16years and VDT operation time more than10h/d are risk factors for dry eye; other factors are not related with dry eye.Conclusion:1. The survey showed the prevalence rate being higher in femalesthan in males.2. The subjective symptoms from the survey, in decreasing order offrequency were as follows: dry eye, musculoskeletal symptoms, eye fatigue, itching, eyepain, memory loss,blurred vision, tearing,headache and dizziness, insomnia, red eye，diplopia，loss of appetite，sensation.3. The longer the VDT work duration, the higherthe dry eye prevalence rate would be. Operation time and dry eye level were positivelycorrelated, i.e. when the work was of longer duration, dry eye was more serious.4. Thesurvey showed that age,sex, length of service and the VDT operation time wereassociated with the occurrence of dry eye.Female,age more than40years old, length ofservice more than16years and VDT operation time more than10h/d are risk factors fordry eye. |
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