Study of Two-step Anesthesia in Posterior Vitrectomy

Purpose: topical anesthesia combined sub‐conjunctival anesthesia(two‐step anesthesia) for minimally invasive vitrectomy Methods: This prospective, randomized, single‐blinded clinical trail is conducted at Shanghai Aier Eye Hospital. Selected group of 60 patients with retinal‐vitreous diseases will be randomized divided into 3 groups and underwent 25‐gauge vitrectomy. Group1 uses two‐step anesthesia , whereas Group 2 uses retrobulbar anesthesia, group 3 uses peribulbar anesthesia. A 5‐point Visual Analogue Pain Scale is used to assess patients' pain score and surgeon's ease while operating. Any complications therefore will be made note of.