A 40-year-old man with no past medical history presents with eye pain.
A 40-year-old man with no past medical history presents with eye pain. His eye is red and the eyelid appears swollen. You are unable to fully test his eye movements as he finds this painful. He has been feeling congested for several days and thinks he may have had a fever since yesterday. What is the most important investigation?
Select the SINGLE most appropriate option from the list below. Select ONE option only.
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