In the case of leukemia, the cancer interferes with the body's ability to make blood. Leukemia attacks the bone marrow and the blood itself, causing fatigue, anemia, weakness, and bone pain. It is diagnosed with a blood test in which specific types of blood cells are counted.amples of blood from a healthy person and from one with leukemia, a type of blood cancer. Leukemia is often diagnosed after blood testing. Hematologists analyze blood cancer samples. Swollen lymph nodes are one symptom of lymphoma. Red blood cells.
1 Antidepressants, which change how information is processed in the nerves in the brain. Any medication that affects neurological function can affect vision and cause changes in the cornea, optic nerve, lens, macula and retina.  Venlafaxine, prescribed for depression can lead to optic nerve damage and/or glaucoma.
Read More. Optic nerve drusen can look like papilledema-swelling of the optic nerve. This can be due to a brain tumor or swelling in the brain. If your first doctor was correct, the other doctor misdiagnosed the problem. was just diagnosed with an optic nerve tumor from a Cat scan and follow up testing from an opthamologist. I was referred to an occuloplastics eye surgeon who is sending me for a MRI. The tumor is sitting on top of the optic nerve and to the left.