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Purpose . To study the correlation between ocular parameters and subjective pain that patients perceived during phacoemulsification.  Methods . 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.  Results . 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 ( β  = 0.220,  P  = 0.016), greater anterior chamber depth ( β  = 0.210,  P  = 0.028), and greater axial length ( β  = 0.181,  P  = 0.043).  Conclusions . 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.

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