污染环境的有害重金属可直接影响视网膜的视觉受体,但主要是对视网膜的杆状细胞有影响,而对锥状细胞则无作用,这是重金属对人体作用的一个新的重要发现。 此项研究工作说明,接触重金属后,发现有许多视觉缺损。他们观察到接触铅和甲基汞的人,夜间的视力敏感性有所下降。在以含有低浓度铅的乳品饲喂大鼠的实验中证实大鼠的视觉中心发育与对照组不同。 因青蛙的视网膜杆状细胞和锥状细胞与其他脊椎动物的特征相同,所以,作者还做了低浓度铅、汞、镉及氯化钡盐对离体青蛙视网膜的电反应作用的研究。 重金属对杆状细胞的作用规律是随着浓度 Harmful heavy metals that pollute the environment can directly affect the retinal visual receptors, but mainly affect the rod cells of the retina, but have no effect on the pyramidal cells, which is a new important discovery of the effect of heavy metals on the human body. The research shows that after exposure to heavy metals, found that there are many visual defects. They observed a decrease in nighttime vision sensitivity in people exposed to lead and methylmercury. Experiments in rats fed diets containing low concentrations of lead demonstrated that the visual center development in rats differed from that in the control group. Because of the same features of the frog’s retinal rod cells and pyramidal cells as other vertebrates, the authors also studied the electrical response of isolated frog’s retina to low concentrations of lead, mercury, cadmium and barium chloride. Heavy metals on the role of rod-shaped cells with the concentration