Final answer:
The term for a twitching of the eyelid is blepharospasm, which is characterized by involuntary muscle contractions around the eyelid.
Step-by-step explanation:
The term that refers to a twitching of the eyelid is . This condition involves involuntary muscle contractions of the muscles around the eyelid. The other terms listed have different meanings: blepharotomy is a surgical incision into the eyelid, blepharoptosis refers to a drooping of the upper eyelid, blepharoplasty is a surgical procedure to modify the eyelids, and blepharitis is inflammation of the eyelids, as referenced in Figure 21.8 (b).