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Comparison of horizontal corneal diameter by the Atlas corneal topography system and IOLMaster

Poster Details

First Author: A.Gonçalves BRAZIL

Co Author(s):    B. Gomes   T. Valadao                 

Abstract Details


To compare white-to-white horizontal corneal diameter (WTW) measurements using Zeiss Atlas Corneal Topography and Zeiss IOL master 500 model in general patients.


Ophtalmology Group at Corneal Department of the Federal Hospital of Bonsucesso situated in Rio de Janeiro – Brazil.


WTW distance were measured with the Atlas Topography and IOLMaster 500 in 361 eyes of 181 patients. Statistical evaluation was performed using the paired t test, Pearson correlation, and Bland-Altman analysis for comparison of measurement techniques.


The mean WTW distance measurements with the Atlas topography and IOL Master 500 were 12.26 ± 0.55 mm and 12.09 ± 0.44 mm, respectively (t=6.93; P < 0.0001). The mean WTW difference between the two devices was 0.17mm (95% confidence interval of mean difference: 0.12 – 0.22mm). The Pearson correlation coefficient between the two devices was 0.61.


There was a statistically significant difference between the mean values of WTW measured with the Atlas Topography and IOL Master 500. These devices should not be used interchangeably regarding WTW measurement.

Financial Disclosure:


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