Thought to share my experience with those who are treated with 3 antibiotics. Recently it has been confirmed that my vision loss was due to a year treatment of 3 antibiotics. The culprit was Ethambutol. My vision gets a bit improvement about two months after stopping the treatment. Good to know that the process seems reversible. During treatment I have been monitored by a ophthalmologist, the problem was discovered at ~11 month treatment. Please note that not everyone will have this problem, please discuss with your doctor about this issue.

@jkiemen I was also changed from 3 times weekly to daily. My infectious disease doc was unhappy with changes he saw in my lung CT and wanted to get more aggressive. At first I had more gastro-intestinal issues and FATIGUE was back like before treatment. Now after about 2 months, the fatigue seems to be less, but I am still losing weight -trying to find a regimen of eating that works again. I have talked to the ID doc and he wants me to try to push through this in hopes that we can get the MAC under control. When I was switched to daily meds, the audiologist did another baseline hearing test and asked to see me every 4 months or immediately if anything changes. The opthamologist sees me every 3 months, and was adamant about keeping the schedule - she does a full visual field exam plus dilated eye exam every time (I also have mild glaucoma.) The ID doc has ordered full blood counts, EKG and liver panel every month, and I see him every 3 months.
As for the beta-blockers, I had to stop taking those a while ago because they interfered with the effectiveness of my asthma medications (which are a beta-agonist.) Hence the frequent EKG to monitor mild heart issues.