is the eye sitting deeper in the socket or lower in the socket (towards the cheek)....does one eye look smaller than other? any double vision at all?
This can occur after trauma, and If you have not suffered blunt trauma, this may be a manifestation of thyroid disorders. Without really seeing it, it is hard to assess whether you need thyroid testing, you should have it checked out. Even with thyroid disorders it is very very uncommon for the eye to sit lower in the eye socket. I think you should have this looked at by an eye doctor. Tell your primary doc so he can send a referral for you to see an ophthalmologist, Dr. Stevens