ABSTRACT
The refractive results of cataract surgery has greatly improved due to recent advances in biometry. Accurate measurement of preoperative axial length is required for accurate IOL power calculation. Postoperative refractive surprises due to error in axial length and keratometry measurements are common. A 54% of all IOL power calculation surprises are due to wrong axial length measurements.1 Under ideal circumstances, an error of 1.0 diopter is seen in 15% of eyes.2
