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视觉系统是许多毒物的靶器官。视力测验对检验暴露于低浓度的神经环境污染物是个很灵敏的方法。为了早期发现铅致神经系统影响的轻微征候,作者对一组职业性接触铅的工人和匹配的不接触铅的对照组进行了视野的定量测定,及临界闪烁频率试验(Performance test of critical fusion frequence)。作者观察男工35人,年龄20～60岁,连续暴露于铅环境下二年以上,全部在生产聚氯乙烯管工厂工作,接触硬脂酸铅。除了配料区铅浓度有时超过阈限值外,其余地方均在阈阳值下且呈弥散的均匀的分布。工人实行轮班制,因此对毒物的接触基本上是相似的。选择条件
The visual system is the target organ of many poisons. Eye tests are a sensitive way of testing for exposure to low levels of neuro-environmental contaminants. In order to early detect mild symptoms of lead-induced nervous system effects, the authors performed a quantitative field of view measurement for a group of workers exposed to lead and matched controls not exposed to lead, and a performance test of critical fusion frequence ). The authors observed 35 male workers, aged 20 to 60 years, exposed to lead for more than two consecutive years, all in the production of PVC pipe factory work, contact with lead stearate. Except for the concentration of lead in the ingredients sometimes exceeding the threshold value, the remaining parts were all distributed uniformly and uniformly at the threshold level. Workers are on a shift basis, so the exposure to poisons is basically similar. Selection criteria