Blinding is a type of physical punishment which results in complete or nearly complete loss of vision. It has been used as an act of vengeance and torture.
The method has been known since Antiquity. The Greek mythology makes several references to blinding as divine punishment, which reflects human practice. An example is Oedipus, who gouged out his own eyes after accidentally fulfilling the prophecy that he would end up killing his father and marrying his mother. In the Bible, Samson was blinded upon his capture by the Philistines.
Early Christians were often blinded as a penalty for their beliefs. For example, St. Lucy's torturers tore out her eyes. In the Middle Ages, blinding was used as a penalty for treachery or as a means of rendering a political opponent unable to rule and lead an army in war. In the 11th century, William the Conqueror used blinding as a punishment for rebellion to replace the death penalty in his laws for England. Henry I of England blinded William, Count of Mortain, who had fought against him at Tinchebray in 1106. He also ordered blinding and castration as a punishment for thieves. In 1014, the Byzantine emperor Basil II had 99 of every 100 captured Bulgarians blinded, leaving 150 one-eyed men to lead them back to their commander. Blinding was accomplished by gouging out the eyes, sometimes using a hot poker, and by pouring a boiling substance, such as vinegar, on them.