i always lash all the medium lashes then i lash the more mature lashes even though they are going to fall out as already said you will at some point infil on the new lashes that grow in their place, some people have really thick strong lashes to start others dont have as many, i have never counted the number of lashes per eye, i will have a go on my next set and see how many, i like to lash as many as i can and will still think at the end, oooh just a few more, then a few more lol x