I have had 3 surgeries for a detache retina. The first with scleral buckle and gas bubble, the second with silicone, and the third to remove the silicone and handle a cataract. The last one was just bofre Thanksgiving. Last week, I has some laser doen, I think for the cataract, and also had an injection of Avastin to my retina. Can you explain the use of the Avastin? I can't find much online, and the Dr.