Visual contact
Visual contact was a term for describing when something was visible.

In 2265, as the  approached the disaster recorder of the , Captain James T. Kirk asked navigator Lee Kelso, "No visual contact?" Kelso respond, "No, sir." ()

In 2366, sensors aboard the  indicated the approach of a Borg vessel but there was no visual contact. Captain Jean-Luc Picard ordered Worf to use their current viewscreen magnification to view fifty s starboard and there was still not visual contact. ()

Measurements