Medical retina & posterior segment: Case five

This 75 year old man had bilateral open angle glaucoma which were poorly controlled with topical medication. A left trabeculectomy was performed and he complained of reduced visual field 2 day post-operative. The above appearance was seen on fundoscopy.

a. What does the picture show?

b. What are the possible causes of such appearances? What is the most likely cause in this patient?

c. How would you manage this patient?