The evil eye, ayn al-ḥasūd, nazar, ʿáyin hā-ráʿ, "buda", "cheshim mora", to máti, mal de ojo, malocchio
 is the belief that envy, can either intentionally or unintentionally 
cause bad luck, sickness, fever, blindness etc in another. Those most at
 risk are considered young children and babies (from childless women’s 
envy) but all can fall victim of it. The idea of the evil eye is most 
prevalent in the Mediterranean, Latin America (do to Spanish conquest), 
Africa and Arabic areas of the world, and in Judaism and Islam but it 
can be found throughout the world. The origin of the evil eye concept, 
appears to have originated from the awareness that we need water to 
survive so the evil eye dries things up. Milk in mothers and livestock, 
trees, men’s semen, babies suddenly getting diarrhea or vomiting etc.It 
is thought that this idea of drying up as the ultimate fear stems from 
the desert origins of the evil eye, but origins can not really be pin 
pointed so exactly and I would venture to say all humans probably 
figured the necessity of reliable water fairly quickly in human history.
 And for those who have studied the early modern beliefs of witchcraft 
in Western Europe and England you will see a correlation in this drying 
things up, with the favorite pastimes of so called witches, so I would 
venture to say in this blog that the fear of lack of moisture was 
probably a fairly universal human phenomenon. Also correlating with 
Western European and English concepts of witchcraft, those who are 
especially good at dealing out the evil eye are those with light eyes, 
unibrows and of course women, especially older barren women, who were 
thought to be only left on Earth after child bearing ages to do the 
Devil’s work, I mean, what else are women for if not baby making?  ;). 
Whatever
 the origins, it appears that the evil eye is caused either 
intentionally or not, by praise or being praise worthy. Even an honest 
and non-envious glance that lasts too long or a compliment paid without 
touching can allow the evil eye to affect you. This is the reason why it
 is a practice to sometimes not dress up children and allow them to be 
dirty in order to avoid the envious look. 
Despite
 the connotation that evil eye has, the victim is also not entirely free
 of blame. Being boastful and pompous, showing off wealth or success 
will draw the evil eye to you and according to Jewish belief, you 
deserve it. Being insensitive to those around you and boasting causes 
real pain and any pain you cause requires a Divine retribution and the 
evil eye is one way of allocating that punishment. The lesson being, to 
take the higher road, there is no need to boast of your success and take
 care not to hurt those around you with it. This is why, one of the many
 ways to deter the evil eye is to give the glory back to Divine. Such as
 the Muslim practice of saying Mash’Allah, literally God will’s it, 
after paying a compliment so any harm the complement may cause will not 
affect the receiver. 
So
 now that you know about the evil eye, you are probably a little worried
 right? You’re out there in the spotlight at your shows and restaurants,
 taking photos posting them all over Facebook and Instagram, you’re 
practically begging for the evil eye. So what’s a dancer to do? There 
are many ways to deter the evil, the most famous being to wear the 
bright blue nazar as a piece of jewelry. Depending on your background, 
you want the eye to be very noticeable, one of the first things the eye 
goes to, so the evil eye will go into it and not you. But if you are of 
the Western Mediterranean variety you may want the charm to always be 
hidden, and over your heart. If the charm is seen, it loses its potency.
 (Sidenote: this was my grandmother’s belief and as soon as I started 
developing early she feared the evil eye and started sewing charms into 
the inside of my bra). Another way, is to have a charm right at the 
entrance of your house, it does not have to be an eye or even eye 
shaped, just something that attracts the eye first and so all evil eye 
will go into that. Especially for children, red cords, black beads are a
 very common deterrent, if it breaks then it is used up and a new one 
needs to be made. Also peacock eyes, the color blue, fish, the hand of 
Fatima (Muslim) or Miriam (Jewish) all are beneficial in deterring the 
evil eye. Or in Italy, a horn pendant is effective. The horn being a 
phallic symbol and the evil eye being considered almost solely sent out 
by women. 
What
 if you don’t have any of these charms on you and some unibrowed, blue 
eyed, barren woman comes strolling into your show staring you down? Well
 if you follow the Italian beliefs, then the hand symbol of holding your
 middle and ring finger down with your thumb (think metal heads rocking 
out, Spiderman shooting web, the traditional horned God symbol) and 
shoot it back at them. Or make an ‘O’ with your index and thumb and put 
your index finger through it (literally a “doing it” from middle 
school). The idea of these hand symbols coming from balancing the 
malintent female energy with masculine energy or creating wetness via 
intercourse.
Want
 to pay a compliment without inadvertently causing the evil eye? Give 
the glory to Divine and say God wills it or Mash’Allah, spit after 
paying the complement (hence the Greek tradition of spitting after 
seeing the bride as she walks down the aisle), or touch the person after
 paying the complement. 
Think
 you are being affected by the evil eye? Take a bath in salt water, 
women with pretty hair spend extra time on your hair (per advice from a 
customer of mine who was so afraid she had given me the evil eye after 
looking at my hair she took salt from the table and sprinkled it in my 
hair and spit). Smudge yourself with cleansing herbs such as sage. To 
officially diagnose the evil eye most processes involve water. Drop oil 
in water and watch the patterns. If the oil forms an eye shape keep 
dropping oil while praying asking for the eyes removal till the pattern 
is no longer eye shaped. Drop charcoal in the water, if it floats you 
have the evil eye. Drop wax in water if it splatters or sticks to side, 
then you have the eye. Roll an egg over your body and crack open if it 
looks cooked or like an eye (though really what egg doesn’t look like an
 eye) if it does you have the eye. Or drink holy water preferably with 
the spit of the perpetrator in it. This idea is also seen in the custom 
of praying over undrank portions of drink from guests and drinking it 
after they left. 
So
 there is the quick and dirty. I am sure there are a lot of evil eye 
beliefs I have left out, but this is what I am familiar with. Feel free 
to add your beliefs in the comments below.