I had both eyes done two weeks apart a year ago. The first eye went great! However, the second eye did not go as well. Shortly after the second eye procedure I had a detached retina. A no fun surgery! Still dealing with some issues even now. I had no eye issues prior to having cataract surgery.
However my detachment resulted from a traumatic injury and was not related to the cataract surgery. Just bad luck.
Retinal detachment is a possibility with almost any kind of invasive eye procedure including cataract surgery and most laser procedures like lasik surgery. My Dr fully advised me of the risks before my cataract surgery. IMO The benefits far outweighed the risk, so I made the choice.