Question: A parent brings their 8-year-old son with a swollen eye, low-grade fever, and malaise to the emergency department. They noticed an insect bite around his right eyelid two days ago. Physical examination reveals a fixed and dilated pupil, red conjunctiva, edema, and proptosis. His vision has been impaired since these symptoms started. There is orbital tenderness on palpitation. What is the most likely diagnosis? A. Orbital cellulitis B. Preseptal cellulitis (periorbital cellulitis) C. Corneal abrasion D. Blepharitis