The abducens nerve is one of the cranial nerves. Unlike most of the other cranial nerves, the abducents controls only one pair of muscles in humans - the lateral rectus, which are one of the six pairs of muscles that control the movement of the eyes by rotating them away from the nose.
Sixth nerve palsy, which causes diplopia, is caused by damage to the abducens. Diplopia can also be caused by a lesion on one of the nerves. The most common infection that affects the abducens is tuberculosis.