DTI of the optic system in a healthy subject. (a) The automated perimeter did no show visual field defects. (b) The frequency doubling test likewise did not show any impaired spatial-temporal contrast sensitivity. (c) The findings in the T2-weighted MRI were normal. (d) The localization of the optic radiations (arrows) is labelled in the T1-weighted MRI. (e) DTI reveals that the optic radiation in the occipital lobe (arrows) is developed vigorously and completely. (f) The schematic drawing shows the anatomy of the visual pathway, particularly of the optic radiation and lateral geniculate nucleus (LGN).