Cataracts are the leading cause of preventable blindness in the world, and Cataract surgery is the second most frequently performed surgical procedure in the world. Before surgery, a measurement procedure is performed to determine the accuracy of the IOL, the biometric measurement procedure is very important to determine the size of the IOL to be implanted to replace the natural lens in patients suffering from cataracts because if there is an error during the calculation procedure, it can cause postoperative refractive abnormalities. Determine the accuracy of biometric calculations in patients after cataract surgery at Waled Regional General Hospital, Cirebon in 2022. This study uses an observational design, retrospective descriptive. The research was carried out through observation of secondary data from the medical records of post-cataract patients at Waled Hospital, Cirebon in 2022 using total sampling and analyzed using univariate analysis. The accuracy of biometric calculation in patients undergoing cataract surgery, after obtaining glasses correction then spherical equivalent calculations were carried, in the accurate category (-1.99 – 1.99) there were 365 eyes (92.2%), while in the inaccurate category (> ±2), 31 eyes (7.8%). Therefore, the results of this study show that the calculation of biometric lenses is quite accurate with the most numbers in the good category, with a percentage of 92.2%. The accuracy of biometric calculations amounted to 365 (92.2%), out of a total of 396 eyes in 220 patients and it is said to be accurate in Waled Public Hospital

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