IRCT20231231060584N1 IRCT 2024-01-27 Hamedan University of Medical Sciences study of the effect of Dexmedetomidine and Fentanil on pain severity and hemodynamic status on catarct surgeries patients Comparative study of the effect of intravenous Dexmedotomidian and Fentanyl in comparison with Midazolam and Sufentanyl on pain severity, surgen consent, patient sedation, hemodynamic status after cataract surgery 2024-01-21 anticipated 80 Complete https://irct.ir/trial/74764 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: The research units are placed in two intervention and control groups with easy sampling and random allocation. The random method is block random. The random sequence and block are extracted from the following website. https://www.sealedenvelope.com/simple-randomiser/v1/lists, Blinding description: The participants in the study (patients) do not know in which group 1 or 2 they are. The surgeon does not know which group 1 or 2 the patient will be operated on. 3 Cataract surgery by phacoemulsification. Intervention 1: Intervention group: Dexmedetomidine 1 microgram/kg and Fentanyl 1 mg/kg are used intravenously during surgery. (Both drugs must be injected on each patient.). Intervention 2: Control group: Sufentanil 1 mg/kg and midazolam 1 mg/kg are used as intravenous injections during surgery. (Both drugs must be injected to each patient.). Yes - There is a plan to make this available What will be shared: It will be available after the end of sampling. When: It will be available after the end of sampling. To whom: It will be available after the end of sampling. Conditions: It will be available after the end of sampling. Where to obtain: It will be available after the end of sampling. How to obtain: It will be available after the end of sampling. Comments: