Which procedure can be used as a surgical treatment for KCS?

Parotid duct transposition is a surgical procedure specifically designed to address keratoconjunctivitis sicca (KCS), commonly known as dry eye. In this condition, a significant reduction in tear production can lead to discomfort and corneal damage. The parotid duct transposition involves rerouting the saliva duct from the parotid gland to the conjunctival sac, thus providing moisture to the eye through saliva which can help alleviate the symptoms of KCS.

This procedure effectively introduces an alternative source of lubrication to the ocular surface, which is crucial for maintaining eye health and comfort in patients suffering from this condition. The saliva is not a perfect substitute for natural tears but helps manage the clinical signs associated with KCS.

Blepharoplasty, limb grafting, and corneal transplant do not address the underlying issue of tear production in KCS. Blepharoplasty focuses on eyelid appearance and function, while limb grafting is a technique often used for corneal reconstruction or repair, and corneal transplants serve to replace damaged corneal tissue but do not impact tear production. Thus, parotid duct transposition is the specific surgical option that targets the etiology of KCS directly by enhancing tear film stability.