@arkie01 Hi, yes the doctor described it as optic nerve damage due to the Ethambutol. I stopped taking the Ethambutol and saw a total of three ophthalmologists. After about 4 months my vision in my left eye started to get better. By August my vision was back to normal. The doctor said I was lucky since I'm 66 years old. My ID doctor did not replace that antibiotic with something else. He just kept me on the azithromycin, rifampin and arikace.