Plaques are quite typical of MS, which is a demyelinating disease of the nervous system with clinical features like
visual blurring due to optic neuritis, decline in cognitive function and
memory loss, numbness and spastic weakness in limbs. Diagnosis would depend on the criteria set for MS and includes MRI brain and spine, csf analysis and visual, somatosensory evoked potentials. You would need your neurologist to assimilate your symptoms with investigations. Best wishes to you.