Which of these is also known as drinking alcohol?

George, It can, in great excess, lead to impairment of vision. You might be muddling, to some degree, ethanol with methanol. Methanol can easily cause blindness due to the toxins produced therefrom through metabolim in the liver.

it is also used as a cheap form of alcohol and if used in excess can cause blindness

Sagitarian56, Most of the natural world works by chemical reactions of one sort or anther

Sagitarian56, that's an odd thing to say.?

You don’t want to drink that!