Efficacy of intravitreal triamcinolone acetonide before pan retinal photocoagulation for improvement of visual acuity and macular edema in diabetic retinopathy

This study is testing whether giving a steroid injection (triamcinolone acetonide) into the eye before laser treatment (called pan retinal photocoagulation) can protect eyesight and reduce swelling in the back of the eye for people with a serious form of diabetic eye disease called diabetic retinopathy. The researchers believe the steroid may help control swelling in the part of the eye responsible for sharp vision (the macula), leading to better vision outcomes after laser treatment. You may be eligible if: - You have diabetes - You have been diagnosed with severe non-proliferative or proliferative diabetic retinopathy - Both of your eyes are at the same stage of the disease, whether or not you have a type of macular swelling called CSME - You are 18 years of age or older You may NOT be eligible if: - Your retina has pulled away from the back of the eye (tractional retinal detachment) - You have glaucoma (increased eye pressure) - Your eye pressure rises in response to steroid treatment (corticosteroid responder) - You have an active infection or disease on the surface of the eye - There is something blocking the view of the back of your eye (media opacity) Talk to your doctor about whether this trial might be right for you.