Hi Kelly,

A Lumbar Puncture(LP) is used in the diagnostic process for many things

If you will read though the link provided in the quoted area you will see some of the conditions the LP may be used to diagnose.

A LP for MS is looking for CSF oligoclonal banding (o-banding). Information about o-banding:
https://www.nlm.nih.gov/medlineplus/...cle/003631.htm

Approximately 90%-95% of those with MS have o-bands when testing spinal fluid. However, there are those diagnosed with MS who either never had a LP or their LP was negative.

There is no single test, by it's self, that can give a definite diagnosis.

What testing, other than the MRI have you had done for your vision? Have you seen an Ophthalmologist? If an Ophthalmologist did not find Optic Neuritis(ON) on exam and the MRI did not show any sign of ON then it would be highly doubtful your eye problem is due to ON.

Lesions found on MRI can have many different causes. Your MRI report has an "impression" section that will give you more information about possible causes for MRI findings. The impression section is not a diagnosis.

Is it possible for headaches/migraines, and/or an injury to cause lesions? Yes.

Multiple Sclerosis is not a disease of the joints. Have you been to a Rheumatologist?