Edge light problem

Hi !
Ok so i’m posting here because i have some issue with the lighting of my model.
the problem is that the eyes and above, was separated object from the face, it worked well on “flat” chading but it mess up with smooth shading, so i merged the two object but it doesn’t fix the issue. I tried to merge the point, or to link them but nothing, i can’t get it right (moreover, merging point totally mess up texture coordonates, i on’t know why)

here is a screenshot to explain better :

thanks !

go into edit mode and remove doubles