A 26-year-old woman presents with diplopia, since waking up a couple of hours ago.
She also complains of a worsening retro-orbital headache which started 3 days ago, and fever since 4 days ago. Self-medication with acetaminophen controlled the fever, but did not relieve the headache.
She was diagnosed with type I diabetes mellitus 8 years ago, and is on insulin therapy. Her glycemic control has been suboptimal due to poor compliance. Her most recent HbA1c assay is 7.5%, dating from 1 month ago.
Her history is otherwise unremarkable. A random capillary glucose is found to be 306 mg/dL (17 mmol/L).