Seeing Double

Question:  A 56 year old male is referred to you for Graves' eye disease causing unilateral left sided retroorbital headache.  You offer him an endoscopic orbital decompression procedure. Two hours after surgery you receive a call from the postoperative area stating that he feels pain and pressure in his left eye.  Your resident evaluates him and finds proptosis with a firm globe.  What happened and what is your next step in management?  [Answer will be posted with next week's new question]

Answer to last week's question, "Breathe In The Air" (July 18, 2016): 

Internal recurvature of the lateral crura.  Batten grafts may be used to support the cartilages and prevent inspiratory collapse of the valve area.