Thanks for the information. I did see a neuro-opthamologist. She didn't feel steroids would be helpful. My vision was worse after 5 weeks so I have wondered if they may have helped. My Neuro-ophthalmologist was highly recommended. I have good blood pressure without meds and I've been tested for sleep apnea. I'll ask my primary care doc if I can get checked out by a cardiologist. I will look into the oxygen concentrator and join the fb group you recommended. I'd just like to know how much risk there is with flying with a disk at risk. Thanks again for the reply