INVESTIGATION OF EYESTRAIN AND WORKING CAPACITY FOR FEMALE CRANE OPERATORS

Ninety-three female mobile crane operators (with an average age of 27. 8 years and average length of service of 8.8 years), exposed to poor e nvironmental conditions, noise, vibration, CO and dust, were investiga ted. The results showed that their distant vision, stereopsis, and acc ommodative functions were normal. However, the eyestrain index, visual motor reaction time, reading ability and mental workload of the femal e drivers were significantly worse than for the controlled group. The post-work's near point convergence, visual motor reaction time and err or rates were significantly worse after work as compared to before wor k. which indicated that fatigue occurred. The visual motor reaction ti me was an important part in evaluating the fatigue of female crane dri vers.