quite simply, as a developmental being, if you couldn't see, you wouldn't know what was going to try and eat you, and you wouldn't be able to see what you were you going to eat.
the result of this is obvious.
Morningstar et al. examined the relative importance of the visual system in hierarchical control of the spine.
they performed a review of studies examining the functional interactions of the postural and somatosensory reflexes.
their findings suggested vision was most important reflexively.