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在人的视网膜上,分布着“锥体细胞”和“杆体细胞”,人们之所以能够在白天看清物体,依赖于锥体细胞的功能;而杆体细胞的功能则是让人产生夜视。除了维生素A缺乏外,能导致杆体细胞功能障碍的原因都可导致夜盲。常见的有以下几种: 铁屑性夜盲 在生产劳动中,当铁屑弹入眼内时,即刻会产生严重的刺激症状;如果铁屑没有完全取出,在眼内就会慢慢发生化学变化,生成氧化铁,影响视网膜上杆体细胞的功能,使之产生夜盲。其特点是:有异物弹入眼内的病史;大多为单侧,由于健侧的代偿作用,往往难于发现自己夜盲,常在健侧眼睛患病或健康体检时才被发现。这种夜盲用维生素A治疗无效。唯一的方法是取出眼内铁屑。
In people’s retina, the distribution of “pyramidal cells” and “rod cells”, people have been able to see objects during the day, depends on the function of pyramidal cells; and rod cells function is to make people produce night vision. In addition to vitamin A deficiency, can cause bar body cells dysfunction can cause night blindness. Common are the following: Iron filings night blindness In the production of labor, when the iron filings into the eye, immediately have a serious irritation; if the iron is not completely removed, the chemical changes occur slowly in the eye, Generate iron oxide, affecting the function of rod cells on the retina, so that the night blindness. Its characteristics are: a foreign body bounced into the eye history; mostly unilateral, due to contralateral compensation, it is often difficult to find themselves night blindness, often in the healthy side of the eye or ill health was found. This night blind with vitamin A treatment is invalid. The only way is to remove the eye iron.