What is the purpose of eyeshadow base and/or primer?

It helps to keep eyeshadow from smudging from sweat and oil on your face. Also it gives powder shadows something to stick to so they stay on better and longer.What is the purpose of eyeshadow base and/or primer?
The purpose of eyeshadow base is:





To make the eyes stand out.


To improve appearance.


To create a memorable look (In Theatre)





It was used many years ago in egypt,greece and rome and is also written in the old testament Ezekiel 23:40What is the purpose of eyeshadow base and/or primer?
to help your eyeshadow on all day... if you use bright colors it also makes them brighter


My favorite is Too Faced Shadow Insurance
it helps the eyeshadow to stick to the eye and to make the eyeshadow brighter.
To prevent creasing, makes eyeshadow colors truer, last longer, and apply better :)
Helps eyeshadows stay true to color


Lasts longer


Blends Better


May even hide imperfections like veins on the eyelid
It makes the color stand out more and become brighter, it also helps it lasts longer. I love Urban Decay's!
It's to help the colors you use mix easier and blend more naturally =)
To keep your eye shodow from natrely smudgind from the oild in ones face.
Blend more naturally.