Conversation so far:
why do they tape your eyes in surgery
During general anesthesia, eyes need protection either by tape or ointment to avoid corneal injuries.
what is the protection of taped eyes under general anesthesia called
Perioperative eye protection under general anesthesia.
can bruising occur when eyes are taped during a general anaesthetic
Bruising of the eyelid can occur when the tape is removed, especially if you have thin skin and bruise easily.
what does the tape protect the eye from during general anesthesia
The tape protects the cornea and keeps it moist.

Question: how do the doctors wake the patient up
Self-contained rewrite: how do the doctors wake the patient up from anesthesia