A 30-year-old male presents to ED with 3-day history of red and painful left eye associated with blurred vision.

Red painful eye

1. List two abnormalities in the above image. 2 marks

2. What is the diagnosis and most likely underlying aetiology? 2 marks

3. Complete the table below with respect to differential diagnosis for acute atraumatic monocular visual disturbance. 8 marks