Comparing the Accuracy of Four Intraocular Lens Formulas in Eyes with Two Types of Widely Used Monofocal Lens Implants

The present study aimed to compare the accuracy of intraocular lens calculation formulas Barrett Universal II, Hoffer Q, Holladay 1, and SRK/T in prediction postoperative refraction for two widely used monofocal implants: SN60WF ZCB00. All eyes were divided based on axial length (<22 mm, 22–24.5 >24.5 mm) type. mean median absolute refractive error (AE) calculated all four formulas, using manufacturer-recommended constants as well optimized constants. subgroup analysis showed that II formula had smallest three groups (with short, medium, long length) before after factor optimization, 1 best results (of medium length), one short group, AL group A-constant optimization. This hints at versatility formula, a fourth-generation is now available most optical biometers provides useful tool lengths even without constant