The Greek traditional belief of Evil Eye is an ancient superstition met in many cultures around the Mediterranean sea from the Ancient times.
As Greek people have, you can have at home, at office, in your car , an apotropaic « mataki » or a greek blue eye charm, an evil eye bracelet or an evil eye necklace or/and ring or any other evil eye to ward against the evil eye.
Evil Eye is also called the invidious eye and the envious eye. In Hebrew it is ayin ha'ra (the evil eye), which in Yiddish is variously spelled ayin horoh, ayin hora, or ayen hara. In Italian it is mal occhio (the bad eye) and in Spanish mal ojo or el ojo (the bad eye or just the eye).
In Sicily it is jettatore (the projection [from the eye]) and in Farsi it is bla band (the eye of evil).
The evil eye belief is that a person - otherwise not malefic in any way -- can harm you, your children, your business, by *looking at them* with envy and praising them.
A better understanding of the term "evil eye" is "overlooking,"and doesn't have any relation with the Evil ;-). The person who harbours jealousy and gives the evil eye is not necessarily an evil person.
In the eastern Mediterranean and Aegean region, especially throughout Greece and up into Turkey, there is a strong tendency to view blue-eyed people as bearers of the evil eye -- probably because few locally-born people have blue eyes and those who do show up, such as tourists, are given to praising and cooing over babies, who are thought to be most at risk from the eye.
I am always doing that which I cannot do, in order that I may learn how to do it.