Method Subjective symptoms of the VDT operators under the Multi-user system were measured before and after work in the field study.Visual indices were measured at 8:15,9:15,10:15,11:15,or 12:15 a.m.

• 方法对寻呼员上午工作前和工作后的主观感觉进行了测评，并分别在8:15、9:15、10:15、11:15、12:15对闪光融合频率、动态视力和屈光度等视觉指标进行现场测试。