I'm only an educated reader, not a doctor, but I think the role of eye movements (or Tetris!) in these types of therapies is simply to consume the patient's ful

I'm only an educated reader, not a doctor, but I think the role of eye movements (or Tetris!) in these types of therapies is simply to consume the patient's full attention and brain power without being tiring or frustrating in the short term - those things just happen to be quite effective at it.