I had a torn retina a few years ago. The procedure to fix it is removing the gel sac and reattaching the retina with a laser. I've heard that the procedures have been changed but even then what they did made wonder if they knew what they were doing. They sewed a ring around my eyeball to squeeze it which made the eye nearsighted. They then put water and a bubble of air in and I had to stay face down for weeks until the bubble disappeared. The theory was that the ring squeezing the eyeball puts pressure on the retina. The other theory is that, face down, the bubble presses up against the retina and holds it the back of the eyeball. Both those theories sound like BS to me.