I see what you are saying - the eye does not have a healthy bulge. It's like popped and either flat or concave.
In that case, I cannot determine what caused this in an unknown retrospect - I understand you are not asking for how it happened but what it is - unfortunately, knowing how it happened usually is of great help in arriving at a few plausible diagnoses. The eye looks dead. A handful of things could have done it.
Again, if there is no reflection of light when using flash on your camera, there is no lens = no eye. No bulge = no eyeball anymore.