Comparison of biometric measurements obtained by the Verion Image-Guided System versus the auto-refracto-keratometer

Cecilio Velasco-Barona, Guadalupe Cervantes-Coste, Erick Mendoza-Schuster, Claudia Corredor-Ortega, Nadia L. Casillas-Chavarín, Alejandro Silva-Moreno, Manuel Garza-León, Roberto Gonzalez-Salinas

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3 Citations (Scopus)


Purpose: To compare the biometric measurements obtained from the Verion Image-Guided System to those obtained by auto-refracto-keratometer in normal eyes. Methods: This is a prospective, observational, comparative study conducted at the Asociación para Evitar la Ceguera en México I.A.P., Mexico. Three sets of keratometry measurements were obtained using the image-guided system to assess the coefficient of variation, the within-subject standard deviation and intraclass correlation coefficient (ICC). A paired Student t test was used to assess statistical significance between the Verion and the auto-refracto-keratometer. A Pearson’s correlation coefficient (r) was obtained for all measurements, and the level of agreement was verified using Bland–Altman plots. Results: The right eyes of 73 patients were evaluated by each platform. The Verion coefficient of variation was 0.3% for the flat and steep keratometry, with the ICC being greater than 0.9 for all parameters measured. Paired t test showed statistically significant differences between groups (P = 0.0001). A good correlation was evidenced for keratometry values between platforms (r = 0.903, P = 0.0001 for K1, and r = 0.890, P = 0.0001). Bland–Altman plots showed a wide data spread for all variables. Conclusion: The image-guided system provided highly repeatable corneal power and keratometry measurements. However, significant differences were evidenced between the two platforms, and although values were highly correlated, they showed a wide data spread for all analysed variables; therefore, their interchangeable use for biometry assessment is not advisable.

Original languageEnglish
Pages (from-to)951-957
Number of pages7
JournalInternational Ophthalmology
Issue number3
Publication statusPublished - 1 Jun 2018

Bibliographical note

Funding Information:
Acknowledgement The Asociación Para Evitar la Ceguera en México I.A.P. provided financial support in the form of biometry assessment grant for enrolled subjects (Grant Number SA-16-00). The sponsor had no role in the design or conduct of this research.

Publisher Copyright:
© 2017, Springer Science+Business Media Dordrecht.

Copyright 2018 Elsevier B.V., All rights reserved.

All Science Journal Classification (ASJC) codes

  • Ophthalmology

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