Eyepiece
A Human eye prepped for the addition of the eyepiece
A Borg drone equipped with a laser eyepiece
An eyepiece or ocular processing core was a cybernetic device replacing one of the eyes of some Borg drones.
A removable component, the Borg eyepiece was capable of detecting a wide visual spectrum as well as providing advanced spatial and geometric analyses. Some versions emitted low-intensity lasers. (ENT: "Regeneration"; TNG: "I Borg"; Star Trek: First Contact)
After Seven of Nine was freed from the Borg Collective in 2374, The Doctor designed an artificial eye to replace her eyepiece. (VOY: "The Gift")
In 2399, a Romulan doctor removed the ocular processing core of Patient 8923/3, a former Borg drone in regenestasis on the Artifact. (PIC: "Maps and Legends")