What is the primary purpose of facial nerve blocks during ophthalmic surgery?

The primary purpose of facial nerve blocks during ophthalmic surgery is indeed to prevent patients from squeezing their eyelids. This is crucial because involuntary eyelid closure can obstruct the surgeon's view and hinder surgical procedures. By blocking the facial nerve, which is responsible for eyelid movement, the surgeon can ensure that the eyelids remain open, allowing for better access to the eye and surrounding structures throughout the operation. This application is particularly important in surgeries involving the eyelid, the conjunctiva, or other anterior segments, where precision and visibility are paramount for a successful outcome.

In contrast, while easing patient discomfort or providing sedation might be relevant in a broader context of surgical procedures, these are not the specific focuses of a facial nerve block within the realm of ophthalmic surgery. Enhancing visual acuity is not directly related to the function of a nerve block, as this pertains more to visual clarity rather than the surgical approach itself.