Corrected entry: The crew members are in a forest having hallucinations because of the wraith machine. Sheppard is hallucinating that he is in the desert during the war helping an injured soldier, so when he's walking around why isn't he bumping into trees? He sees nothing but sand, even mentions it at one point, but they are in the forest and he walks around pretty freely.
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Correction: The human brain has more than one set of visual "control" systems which creates a phenomenon called "blindsight" when the higher visual functions are either disrupted or-theoretically-affected by some sort of illusion. Basically, blindsight is involved in "instinctual" responses to visual stimuli-like avoiding collisions or aligning the fingers to grasp an object-which can function even as the person can't consciously register anything visually.