The most likely cause of abnormal vision in this patient is: (poll 8103022)

The most likely cause of abnormal vision in this patient is:

Optic neuritis, constituting breakthrough MS disease activity on fingolimod.

Macular edema as a complication of fingolimod.

Optic neuritis, likely due to poor compliance/not taking fingolimod.

Uhthoff's Phenomenon.

Retinal detachment, unrelated to MS or MS treatment.

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