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Predicted refraction and postoperative refractive outcomes using three different biometers in cataract surgery

Poster Details

First Author: A.Miranda PORTUGAL

Co Author(s):    S. Parreira   S. Barros   N. Marques   J. Cardoso   P. Telles   N. Campos     

Abstract Details


The choice of a suitable intraocular lens is an intriguing challenge in modern cataract surgery. Therefore it is important to test the accuracy of biometers, particularly taking the postoperative results into consideration. The purpose of our study was to compare the difference between the predicted and actual postoperative refractions using optical biometers IOL-Master 500 (Carl Zeiss Meditec, Jena, Germany) and AL-Scan (Nidek Co, Aichi, Japan), and contact A-scan biometry.


Hospital Garcia de Orta, EPE, Portugal


Retrospective study, including 93 eyes from 80 patients who underwent uncomplicated cataract surgery with primary in-the-bag intraocular lens implantation. Predicted refraction was obtained using SRK-T formula in IOL-Master in 30 eyes, AL-Scan in 36 eyes and contact biometry complemented with automated keratometer RK-F2 (Canon) in 27 eyes. Postoperative refractive error was calculated using subjective refraction performed one month after surgery. The difference between the predicted and actual postoperative refractions was determined and compared between the three biometers.


93 eyes from 80 patients with available data one month after surgery were evaluated. The mean axial length in the IOL-Master group was 23,29±0,84 mm, in the AL-Scan group 23,38±1,32 mm and in the contact biometry group 23,26±1,63 mm. The mean difference between the predicted and actual postoperative refractions with SRK-T formula was 0,35±0,23 diopters (D) in the IOL-Master group, 0,47±0,33 D in the AL-Scan group and 0,67±0,73 D in the contact biometry group. We established a statistically significant difference between IOL-Master and contact biometry groups (p=0,04). We found no difference between AL-Scan and IOL-Master (p=0,2) or contact biometry (p=0,6).


Compared to other biometers included in our study, IOL-Master was the most satisfactory in achieving the predicted refraction after cataract surgery. This difference was particularly relevant when comparing IOL-Master with contact ultrasound biometry.

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