Correlation of Visual Operation Time with Ocular Symptoms and Anterior Ciliary Artery Hemodynamics

Objective To evaluate the correlation of visual operation time with ocular symptoms and anterior ciliary artery hemodynamics.

Methods Video display terminals(VDT) workers(n=147) were enrolled as study group, and non-VDT workers(n=142) as control group. Screen operation time, ocular symptom scores, and the hemodynamic parameters of anterior ciliary artery including peak systolic velocity(PSV), end diastolic velocity(EDV), and resistance index(RI) were calculated and compared. Their correlations with screen operation time were also evaluated.

Results The ocular symptom scores and anterior ciliary artery RI of the study group were significantly higher than those of the control group(6.24±1.36 vs. 1.68±0.24, 0.57±0.07 vs. 0.55± 0.07), while the anterior ciliary artery PSV and EDV were lower. The screen operation time was positively correlated with the ocular symptom scores and anterior ciliary artery RI(r=0.62, 0.66, both Ps < 0.05), but negatively correlated with the PSV and EDV(r=-0.71, -0.64, both Ps < 0.05). The total ocular symptom scores were positively correlated with the RI(r=0.74, P < 0.05), but negatively with the PSV and EDV(r=-0.66, -0.71, both Ps < 0.05).

Conclusion Long-time visual operation is liable to cause ocular symptoms, and lead to a high resistance and low perfusion of anterior ciliary artery. Lower blood flow perfusion of anterior ciliary artery is associated with more obvious ocular symptoms of the workers.