This study is a double-blind clinical trial because patients were anesthetized, and they were not aware of intraocular injection and evaluation was performed by an anesthesiologist who did not know the code of patients. The purpose of this study is to reduce postoperative pain after cataract surgery. Study patients consisted 48 male and female candidates for cataract surgery and cases with liver and kidney failure, hypothyroidism, hyperthyroidism, uncontrolled diabetes, or uncontrolled hypertension were excluded from the study. They were randomized completely into two groups (each one 24 cases) and both groups by the same drugs were placed under general anesthesia: midazolam 0.2 mg/kg, fentanyl 2 µg/kg, thiopental sodium 4 mg/kg, atracurium 0.05 mg/kg. In the study group after induction and washing and cutting the cornea to the anterior chamber, 0.1 mg of lidocaine 1% was injected and in the control group, lidocaine was not injected. Pain of the patients was evaluated based on the pain scale ranging from 0 to 10 just after their admission to recovery, and 1, 2, and 3 hours after their transition to the recovery. Moreover, their blood pressure, heart rate and complications such as itching was evaluated.