IRCT20180606039989N1 IRCT 2018-07-27 Mashhad University of Medical Sciences Effect of pre-operative doses of betamethasone acetate 0.1% on control of eye inflammation and pain after cataract surgery. Comparing the effect of pre-operative doses of betamethasone acetate 0.1% and placebo on control of eye inflammation and pain after cataract surgery in patients who undergo phacoemulsification surgery. 2017-03-21 anticipated 80 Complete https://irct.ir/trial/31759 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Parallel, Purpose: Prevention, Randomization description: Simple randomization method was used to allocate patients to the control and experimental groups. At the beginning of the study, patients were assigned serial numbers 1-80, then the numbers were poured into a container and 40 items were randomly assigned that was placed in the experimental group and the remaining numbers were in the control group, Blinding description: This study will be conducted as double-blind . The drops will be filled by pharmacologist colleague and without the knowledge of the researchers and patients, and will be named as A or B. After performing all the steps and follow-up, at the end of the design, the type of each drop will be revealed. 2-3 senile cataract. Intervention 1: Intervention group: administering betamethasone 0.1% eye drop 3 days prior to surgery 4 times a day, one drop each time. Intervention 2: Control group: administering normal saline 0.9% eye drop 3 days prior to surgery 4 times a day, one drop each time. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is There is no further information.