Advice please

My brother has been recently diagnosed with RA   , he has thinning of the eyes an a cornea mekt , which he had a operation for 2 weeks ago , which doesnt seem to of worked , as hes has more melting an thinning , theyre giving him chemotherapy , he has his 2nd dose next week , I just wanted to know if anyone else has been through this   , my brother is really down an is convinced he'll lose his site , be so grateful for any feed back xxx