Clinical Analysis of Ocular Parameters Contributing to Intraoperative Pain during Standard Phacoemulsification.

. To study the correlation between ocular parameters and subjective pain that patients perceived during phacoemulsification. . Medical records of 142 patients who underwent standard phacoemulsification under topical anesthesia between March and August 2016 were retrospectively reviewed. The pain during phacoemulsification and 1 h after surgery was assessed and compared using a visual analog scale. In addition, demographic data, preoperative biometric parameters, and intraoperative surgical parameters were recorded. . Mean age of patients was 67.49 ± 12.50 years. The mean pain score was 2.26 ± 0.85 during phacoemulsification and 0.40 ± 0.69 postoperatively. Intraoperative pain was significantly associated with higher preoperative intraocular pressure ( = 0.220, = 0.016), greater anterior chamber depth ( = 0.210, = 0.028), and greater axial length ( = 0.181, = 0.043). . To reduce the subjective pain when patients have high preoperative intraocular pressure, large anterior chamber depth, or great axial length, supplementary procedures may be required.