It's usually due, in part, to the orientation of the bony orbits; they eye sockets; the holes the eyeballs are in and the lower part of the bony circumference outside of the eyeball holes in the skull called the lower orbital rim. It's not an uncommon trait for some ethnic groups to have. So, personally, I would not assess it as a 'deformity'. The best way to show it is via a frontal photo and also a profile.