I'm posting for my father as he's not into computers. He went to...

I'm posting for my father as he's not into computers. He went to the hospital for COPD - emphysema and he was on Prednisone for 10 days that he was there followed by 3 weeks of tapering it off. I didn't listen to his complaints and now I feel bad, it seems that his blurred vision and teeth and gum pain are serious, and a couple of his teeth have basically fallen out. Does anyone know if the vision problems were permanent? Obviously it's too late for his teeth...