Objective of ETDRS study is: (A) Effect of aspirin on the course of diabetic retinopathy, (B) To observe patients with severe DR in type 1 and type 2 diabetes over 2 years to determine visual outcomes, (C) To evaluate whether photocagulation prevents severe visual loss in eyes with diabetic retinopathy, (D) ALL of the above
Answer is A. Option A - ETDRS study
Option C - DRS study
Option B - DRVS study