A little confused what should i do.?

Ok so i went to the doctors because of visual disturbances...I told them my worries of a brain tumor..they looked into my eyes and said that it checked out fine and that there wasnt a tumor pressing on the optic nerve so that its not related to a brain tumor. They checked other things to rule out a brain tumor as well(neurological exams). I passed them all. So at the end the doctor said i dont have a brain tumor. But she didnt tell me whats causing the visual disturbances. Should i go back to the doctor or because they ruled out a brain tumor should i just go to an eye doctor?