In the lumbar puncture the pressure of the fluid around your brain (csf) will be checked. If there is swelling in both your optic nerves, and sometimes when there is swelling in just one, it can be due to increased intracranial pressure. Also, a sample of csf will be taken to check for bleeding, fungal, viral and bacterial infection as well as evidence of inflammatory conditions (such as MS) or neoplastic processes.
I would expect that your ophthalmologist would work closely with an internal medicine physician during this workup. Any of the above issues could cause optic nerve inflammation, headache, night sweats as well as a slew of other physical symptoms.
The reduced vision and washed out colors in your affected eye is due to the involvement of the optic nerve. This might improve once the inflammation resolves, it is hard to tell at this point.
You have a very complex problem but from what you have stated it sounds like you are in are in good hands. I would do exactly what your ophthalmologist is doing if you came to my office.
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