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Comparison between a new Swept source OCT based optical biometer versus a standard PCI optical biometer in cataract patients

Poster Details

First Author: Z.Khatib INDIA

Co Author(s):    I. Khatib                    

Abstract Details


The aim of this study was to compare the refractive accuracy of a new optical biometer (Tomey OA-2000 which is based on swept source optical coherence tomography combined with Placido-disk corneal topography) versus a gold standard partial coherence interferometry optical biometer (IOLMaster 500).


A tertiary eye care hospital, Western Maharashtra, India.


40 eyes of patients (AL 22-26mm) who underwent uncomplicated Phacoemulsification with AcrysofIQ IOL were included. The 2 study arms which included 20 eyes each, underwent Biometry by the above 2 biometers respectively. Post-op refraction was performed at day 21 and the biometer error for each eye was calculated as difference between the prediction error and the actual post-op SE. IOL power was calculated for both groups using the online Barrett U2 calculator, and the absolute mean and median error was compared between the 2 groups. Also the percentage of eyes within +/-0.25D was found out and compared between the groups.


The mean and median absolute errors for the Tomey biometer were 0.23 and 0.19 respectively, while the mean and median absolute errors for the IOLMaster were higher at 0.30 and 0.29 respectively. This difference was not statistically significant. The Tomey biometer also showed a lower box and whisker distribution plot as compared to IOMaster indicating a more predictable result. The percentage of eyes whose error was within +/-0.25D was 70% for the Tomey group and 40% for the IOLMaster group.


In conclusion, the predicted refraction by the Tomey OA-2000 biometer proved to be more accurate and predictable as compared to the Zeiss IOL Master 500 in cataract patients with normal axial lengths.

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