yes, it will lead to blindness. After you drink alcohol, it causes the tiny blood vessels on the surface of the eye, called the sclera, to become dilated and inflamed, resulting in bloodshot eyes. So you will feel hot in your eyes after drinking. Besides, you should know that heavy drinking depletes the body of the nutrients needed for eye health and consequently can lead to a condition know as alcoholic optic neuritis. This can impair eyesight and, in time, lead to blindness. And for the brain, in the short term, heavy drinking depletes the body of vitamin B1, causing a lack of concentration and poor memory. In the longer term, it can kill off brain and nerve cells leading to memory loss, confusion and reduced co-ordination. It can also shrink the brain, which increases the risk of epileptic fits, and make cerebral blood vessels more likely to rupture and hemorrhage. in other words, drinking alcohol will not only damage your eyes and brain ,but also do harm to your other organ like mouth ,teeth ,heart ,skin and so on. So you'd better control it for your body's health.