First of all, understanding your eye shape will help you choose the kind of styles of lashes that will suit you.
Deep-set eyes; when your eyes are set deeper into the head creating an illusion of a more prominent brow bone. Try lashes that are longer in length at the centre of the lashes.
Downturned eyes; when the outer corners of the eyes appear to be drawing downwards. Try a shorter strip lash that is longer in the outer corners to lift your eyes.
Hooded eyes; when the crease on your eyelid isn't visible. Try a thin strip lash in a shorter length.
Prominent eyes; when your eyelids appear projected in the eye socket area. Try balancing your top lashes with strip lashes on the bottom, too, which will give the illusion of pushing back your eyes.
In addition, consider if your eyes are close-set or wide set.
The close-set / wide-set test:
Using a pencil, pen or makeup brush look into a mirror and place your tool from the inner corer of the eye to the outside edge which will let you measure your eye. Technically you should be able to fit the width of one of your eyes perfectly in between the two eyes. When you get overlap (i.e. there's less than one eyeball width space apart) you tend to have close-set eyes so you want to create the illusion of drawing them apart with lashes that are longer at the outer corners. If the space is bigger than one eyeball width then you have wide-set eyes and want the emphasis to be towards the center and inner corner of the lashes to draw the eyes together.
