I have no idea how they are chosen. I think trial will be the technique. Try it if you feel that it absolutely perfect for you then you buy it. nevertheless ask the vendor which one is the best.

There are no tricks in choosing eyelashes; actually that depend on your choice. I’ve chosen Paula Dorf Cake Mascara. I’ve just bought that and I must tell you it is a worth praising product. It is not washed away by water and does not clump. It is a soft liquid that dries quickly on application and make the lashes appear voluminous. It could your choice too. Test it.

I always look for the most expensive and famous beauty products for my sister, not only that, i would also ask for advice from the beauty consultants before purchasing the products and i would advice you also to do the same and your problem solved!

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"Love built on beauty, soon as beauty, dies."
-John Donne