Vision Problems And Lupus - light appears dim all the time

My son is having a series of medical problems. The doctors have mentioned Lupus but because of a recent heart problem things have been put on hold until it can be figured out. He recently had a heart catherization, after the proceedure and lying flat for the four hours, the nurse attempted to get him up. He had what appeared to be a small seizure. He had a head CT done and everything was normal. Now the weird part, he is having vision problems now. He says it feels like the lights are on dim all the time. He even had one episode where he completely lost vision. Now even weirder, he sees things that are not there. For example, he sees things that he has seen earlier throughout the day, just out of nowhere. It is hard to explain, but it is not like hallucnations, it is actually things he has seen, and they appear exactly like he saw them earlier. I was just wandering if anyone diagnosed with Lupus has similar problems.