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Functional comparison of the performance of a new biometry instrument

Poster Details

First Author: J.Dermott UK

Co Author(s):    S. Kheterpal   R. Morris   C. O'Donnell   A. Hartwig   J. Thethy  

Abstract Details


To assess the accuracy, reproducibility and ergonomics of using a new all-in-one optical coherence biometry device (Aladdin, Topcon, Tokyo, Japan) compared with outcomes from devices already established in use.


Optegra Eye Sciences, Optegra UK.


Retrospective agreement analysis of measurements of axial length, anterior chamber depth (ACD) and keratometry obtained on the same group of eyes (n = 48) using two instruments; the Topcon Aladdin and the Zeiss IOLMaster. A Bland-Altman method was used in order to investigate the limits of agreement.


For axial length, the mean arithmetic difference (95%CI) between measurements was 0.011±0.020mm (0.017 to 0.004mm). Limits of agreement were -0.0292 to 0.0503 mm. For ACD, the mean arithmetic difference (95%CI) between measurements was -0.025±0.080mm (0.002 to 0.052mm). Limits of agreement were -0.1816 to 0.1319 mm. For keratometric astigmatism, the mean arithmetic difference (95%CI) between measurements was 0.01±0.25mm (-0.077 to 0.093mm). Limits of agreement were -0.4912 to 0.5074 mm. There were no statistically or clinically significant differences obtained for any parameter.


Agreement has long been established between applanation ultrasonography and optical methods, and this study suggests agreement between a new optical biometer and an established standard to within the limits of clinical significance. FINANCIAL INTEREST: NONE

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