Ophthalmology General d21d5ed0 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 High-Yield Explanation Option A - ETDRS study Option C - DRS study Option B - DRVS study