My father, aged 68, was recently in complete bed rest for the last 3 months and was taking akt 4 ofr first 2 months and then 1 month of akt3 after being diagnosed with Pott's spine. Spine surgeon told us that he is clinically doing really well and his CRP has improved from 67 to 11.2 Recently he is started to have blurred vision so we checked with Eye specialists and they suggested it to be EMB induced optical neuropathy. Its been some 4 weeks now that we have stopped Ethambutol and he has partially regained vision though there is acuity problems still. Now that he is on Rifampicin and Isoniazid, does he need to take some other medicine in place of ethambutol for his TB treatment? Hope stopping Ethambutol will not effect his spinal TB.