It’s a well-known fact that smoking can cause lung cancer, but did you know that smoking can also harm your eyes? Tobacco toxic optic neuropathy is the most common harm to the eyes caused by smoking. Smoking will hurt the eyes for the following reasons: on the one hand, smoking when the body inhaled oxygen is consumed, resulting in a drop in the oxygen content of the blood, and the retina is sensitive to hypoxia root, long-term, the optic nerve fibers will change, the retinal papillary macula will also be atrophied. On the other hand, tobacco burning produces smoke tar will lead to a decrease in the body’s vitamin B content, and vitamin B12 is a nutrient necessary to maintain the normal function of the optic nerve. Second-hand smoke is even more dangerous and can trigger asthma, bronchitis, pneumonia and ear inflammation in children’s, and can be very harmful to the eyes. For these reasons, smokers can not only cause their own vision loss, but can also endanger the health of others. Resolutely quitting the habit of smoking and staying away from smoking environments is the key to preventing the occurrence and development of vision damage caused by tobacco.