From the past one month I experienced slight blurriness in left eye and had pain around eye..but this was temporary..then after some days same thing happened in my right eye..but now it is gone..but now it is in left eye...I had gone to opthalmologist last week . ..he checked my eye through indirect opthalmoscopy and said that everything was normal.in April I was detected with low b12 levels so I am taking medications for it..troynuron SR and biod3 max ..I also took hi cobal injection initially. Why is it happening and what is it?