What differential diagnosis will the care team first suspect?

A 46-year-old male has presented to the emergency department because of the eye pain, severe headache, and blurred vision that have followed an eye exam at an optometrist’s office earlier in the day. The patient tells the triage nurse that he received eyedrops during the exam “to keep my pupils wide open.” What differential diagnosis will the care team first suspect?
Infectious conjunctivitis
Keratitis
Corneal trauma
Angle-closure glaucoma