My dad's cataract surgery went wrong

My father had cataract surgery 2 weeks ago. The evening of his surgery he received a phone call from a nurse checking on him and then a few hours later his surgeon called to check on him. At the time, my mom thought this meant they were just being very, very caring, but now, in retrospect, we are wondering if he experienced an intraoperative complication. At first his vision was a little blurry, then it seemed to get better, but now it is worse again. He says his vision is growing dark. Surgery on the other eye has been put on hold. His surgeon told him at his follow-up appointment that he had experienced a very rare complication. I wish I could have been there because my mom and dad do not understand what went wrong and they are not sure what to do next. I think he needs a second opinion. Any thoughts?