On a Friday, I had surgery for a detached retina and a small gas bubble was placed in my eye. I was told that I only had to keep my head down over the weekend, which I did. I slept on my left side until the bubble dissipated, about 2 weeks. I had central vision before the surgery, now, a month after the surgery I still do not have central vision. There is a gray shadow wherever I focus. Will my central vision come back in time or do I need another procedure to correct this?