有位不吸烟、不饮酒、有良好卫生习惯的青年。半年前,由于爱情上的波折,使他消沉极了,他天天陶醉在烟酒之中。最近不知是何原因,他的双眼视力逐渐进行性的模糊,有时颜色也分辨不清,看了一位眼科医师毫无效果。现在阅读都感到困难,他害怕有失明的危险,决定去省医院检查,在省医院他做了眼底检查,发现视神经轻度萎缩,视野检查出现了哑铃状暗点最后诊断为中毒性弱视症,是过量吸烟饮酒的结果,其原因是烟中含有氰,吸入体内后变成硫氰化物,在正常情况下这种物质可以从尿中排出,若排泄发生障碍储积在体内则影响视神经,发生中毒性弱视症。酒中含有乙醇 There is a non-smoking, no drinking, have good health habits of youth. Six months ago, due to the twists and turns in love, so that he was extremely depressed, he every day intoxicated with alcohol and tobacco. Recently I do not know why, his eyes gradually blurred vision, and sometimes the color is also not clear, saw an eye doctor no effect. Now feel difficult to read, he was afraid of the risk of blindness, decided to go to the provincial hospital examination, he did in the provincial hospital fundus examination found mild optic atrophy, visual field dumbbell-like dark spots appeared finally diagnosed as toxic amblyopia, Is the result of excessive smoking and drinking, the reason is that the smoke contains cyanide, inhaled into the body into thiocyanate, under normal circumstances this substance can be discharged from the urine, if the excretion of obstacles in the body is stored in the optic nerve, the occurrence of Toxic amblyopia. Alcohol contains alcohol