1904年9月24日,第一个用紫外线治疗狼疮的丹麦著名医学家芬生逝世。芬生被人称为“用光线治病的神医”。现代医学中用激光来治病,也是光线治病的一种,让我们来看一下激光是如何治病的!一块小小的放大镜,就可以将太阳光聚成一个小点,这个小点上的能量可以使火绒燃烧。古希腊学者阿基米得,曾经根据这个道理,用一块很大的凹面镜,将太阳光聚焦成一点,企图摧毁罗马舰队,当时要制造巨大的凹面镜,在工艺技术上受到了限制,无法会聚成强大的能量,终未成功。很久以前,眼科医生就认为用太阳光的聚焦能量,可用来治疗眼病,并设想将能量聚焦在眼视网膜上,引起小的灼伤,结疤后能焊接破裂的视网膜。但是,太阳光里含有一些看不见的射线,这些射线会损伤眼睛,而且聚焦等技术不易解决,所以,用太阳光来治疗眼病,只停留在设想上并没有实现。20世纪50年代初,眼科医生根据上述原理,使用了氙弧白光治疗眼病,证实了用光聚焦在视网膜上引起小的灼伤,可以焊接破裂的视网膜。可是,氙弧白光同太阳光一样,也是不纯的光,它同样带有损伤眼睛的射线。
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