In Orbit

Question:  A 15 year old male develops pain in the left eye and forehead following an upper respiratory infection.  On endoscopic examination you find purulence in the middle meatus.  His eye has conjunctival injection, proptosis, and chemosis.  You suspect a complicated frontal sinusitis and order CT imaging, which is pending.  Based on the physical examination alone, which Chandler grade is ruled out?  [Answer will be posted with next week's new question]

Answer to last week's question, "Pop Your Ears" (December 5, 2016):

Grade 2 (injection plus mild hemorrhage in the TM).