Given a passage, construct a question on the basis of the information present in the passage. Construct the question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) it answer uses text phrases from the passage. Avoid creating questions that (i) can't be answered correctly without actually understanding the passage and (ii) uses the same words or phrases given in the passage.

Corticosteroids remain the mainstay for control of ocular inflammation after vitreous surgery. A controlled, randomized, prospective study was performed to evaluate the effectiveness of a single intravitreal injection of dexamethasone phosphate on postoperative inflammation after simple vitreous surgery in patients with proliferative diabetic retinopathy and macular pucker.', 'Aqueous cell flare intensity was measured preoperatively and on days 1, 10, and 90 in 56 consecutive patients who underwent vitreous surgery for proliferative diabetic retinopathy and macular pucker. Subjects were consecutively randomized to two groups: 400 microg of intravitreal dexamethasone (treatment group) or no dexamethasone (control group)', 'Before surgery, cell and flare intensity was similar in both groups. Flare intensity was significandy lower at 10, 30, and 90 days in the proliferative diabetic retinopathy treatment group (P < .05).
Does intravitreal dexamethasone effectively reduce postoperative inflammation after vitreoretinal surgery?