Ocular node
The ocular node was a cybernetic device implanted within each Borg drone allowing for an increase in visual perception.

In 2376, the 's EMH was re-programmed by the renegade crew of the  in order to remove Seven of Nine's cortical array. As he did so, he sang a variation of "Dem Bones", noting that the ocular node was connected to the sensory node. ()

Borg components