Could it be a disorder like dysgraphia? DS has messy handwriting as well and has developmental coordination disorder.

DS's neuropsych (with a large university) did NOT recommend VT, said the research does not back it up. I thought that was kind of overboard harsh considering that his eyes were quite obviously crossed for several months due to brain damage (but maybe VT has little chance of helping in that circumstance anyway). The only person that "pushed" VT, was his OT. Neither opthamologist did (one was a neuro-opthamologist) nor the neuropsych. I think there are probably some legitimate cases where it might help, but I also think that convergence issues are probably way over-diagnosed by people specializing in VT.