Traumatic eye with late presentation of unilateral proptosis and scleral hyperamia is seen in
Retrobulbar hematoma
Retrobulbar cellulitis
Carotico cavernous fistula
Pneumo orbit
Proptosis after trauma, late presentation ,scleral hyperamia, most probable diagnosis is Retrobulbar hematoma . Refer khurana 6/e 404
Diseases of orbit, Lids and lacrimal apparatus