What would cause a feeling of vertigo for just a split second with eye movement up or down?seems happen when scrolling on phone. mri clear.ent clear.

Imbalance: Sounds like you may have an imbalance in the semicircular canals which are activated by eye movements. The brain will be activated then, in an asymmetric fashion making your brain think that you're spinning in a certain direction. A neurologist or Neuro-ophthalmologist can help you. Important to figure out what's CAUSING those eye movements as well.