Suggest Treatment For Peripheral Vision Loss After Cataract IOL And Glaucoma

I had retinal detachment surgery 14 years ago. Six years ago, I had cataract IOL and then glaucoma. I have used eye drops. Now I have one half of my vision remaining (peripheral loss). I bean using Cosopt a.m. and pm along with Travatan. My doctor says the loss is due to the surgery. Will I lose the remaining vision? I am very compliant.