”Many smokers are often intoxicated by the intoxicating habits of life, but are unaware of an invisible killer that is slowly coming to them. It has become common knowledge that heavy smoking and alcohol abuse can be harmful to the human body, for example, the incidence of lung cancer is significantly higher in smokers than in non-smokers. For example, in industrialized countries, 20% of deaths are indirectly or directly related to smoking, and can also induce myocardial infarction, pulmonary heart disease, gastric ulcers and bronchitis. Long-term alcohol consumption can cause chronic liver toxicity and liver stiffness, etc. However, do you know the damage they can do to the fundus of the eye? For as tobacco contains substances with vasoconstrictive effect, long-term smoking can cause retinal vasospasm, inducing retinal vein artery or vein blockage and lead to retinal and vitreous hemorrhage, especially for the elderly, the cardiovascular system is already sclerosis, stenosis, and can also cause toxic amblyopia. The reason for this is that in addition to the nicotine and arsenic toxic substances contained in tobacco, but also contains a very toxic hydrogen compounds. Normal people inhale a small amount of hydride, in the body can be converted into a very low toxicity of sulfur hydride, through the kidneys from the urine. But when excessive smoking leads to excessive accumulation of hydride in the body, it can cause chronic poisoning, so that the retina and optic nerve damage, and even cause optic nerve atrophy, so that vision loss, serious cases can lead to blindness. There is a British proverb on the wine “Dukang” portrayed as “the god of wine kills like the god of the sea”, a normal person, if more than 100 milliliters of liquor for five consecutive years, will cause alcoholic cirrhosis of the liver. Excessive alcohol consumption can not only induce retinal hemorrhage, and can aggravate the original retinal vascular disease, such as ischemic lesions, and can cause alcoholic amblyopia. Some people are addicted to excessive smoking and alcohol, and the combination of the two can aggravate the symptoms of tobacco and alcohol poisoning. Therefore, in order for these people to get rid of eye diseases, they should always be warned that only by giving up their bad habits as soon as possible can they achieve health and happiness.