A 28-year-old man with neurofibromatosis type 1 (NF1) undergoes routine MRI brain for surveillance. Imaging reveals a 1.2 cm T2-hyperintense, non-enhancing lesion in the left optic nerve with mild mass effect on the globe but no visual symptoms. Visual acuity is 6/6 in both eyes. What is the most appropriate next step in management?

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