Approach to a red eye Quiz: Ace Your Exams

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A 62-year-old woman presents to the emergency department for redness of her left eye that she noticed after awakening in the morning and looking in the mirror. She does not have eye pain. There has not been any trauma, and she has not experienced recent vomiting or coughing. The redness has not changed over the last 6 hours. Past medical history includes atrial fibrillation for which she takes warfarin. Temperature is 37.0°C (98.6°F), pulse is 80/min, respiratory rate is 16/min, blood pressure is 124/80 mmHg, and oxygen saturation is 99% on room air. On examination, the patient is in no distress. Vision is 20/20 in both eyes. The left eye has well-demarcated erythema as seen in the picture below. Bilateral pupils are reactive to light and accommodation, extra-ocular muscles are intact, and fluorescein examination is normal.  Minor bruises are noted on the forearms bilaterally and the patient states these are from lifting furniture while helping her son move the day before. International normalized ratio (INR) is 2.5. Which of the following is the best next step in management? 



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