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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Abstract

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
Volume38
Issue number3
DOIs
Publication statusPublished - 1 Jun 2018

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Biometry
Mexico
Observational Studies
Students

All Science Journal Classification (ASJC) codes

  • Ophthalmology

Cite this

Velasco-Barona, C., Cervantes-Coste, G., Mendoza-Schuster, E., Corredor-Ortega, C., Casillas-Chavarín, N. L., Silva-Moreno, A., ... Gonzalez-Salinas, R. (2018). Comparison of biometric measurements obtained by the Verion Image-Guided System versus the auto-refracto-keratometer. International Ophthalmology, 38(3), 951-957. https://doi.org/10.1007/s10792-017-0541-3
Velasco-Barona, Cecilio ; Cervantes-Coste, Guadalupe ; Mendoza-Schuster, Erick ; Corredor-Ortega, Claudia ; Casillas-Chavarín, Nadia L. ; Silva-Moreno, Alejandro ; Garza-León, Manuel ; Gonzalez-Salinas, Roberto. / Comparison of biometric measurements obtained by the Verion Image-Guided System versus the auto-refracto-keratometer. In: International Ophthalmology. 2018 ; Vol. 38, No. 3. pp. 951-957.
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abstract = "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 Asociaci{\'o}n para Evitar la Ceguera en M{\'e}xico 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.",
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Velasco-Barona, C, Cervantes-Coste, G, Mendoza-Schuster, E, Corredor-Ortega, C, Casillas-Chavarín, NL, Silva-Moreno, A, Garza-León, M & Gonzalez-Salinas, R 2018, 'Comparison of biometric measurements obtained by the Verion Image-Guided System versus the auto-refracto-keratometer', International Ophthalmology, vol. 38, no. 3, pp. 951-957. https://doi.org/10.1007/s10792-017-0541-3

Comparison of biometric measurements obtained by the Verion Image-Guided System versus the auto-refracto-keratometer. / Velasco-Barona, Cecilio; Cervantes-Coste, Guadalupe; Mendoza-Schuster, Erick; Corredor-Ortega, Claudia; Casillas-Chavarín, Nadia L.; Silva-Moreno, Alejandro; Garza-León, Manuel; Gonzalez-Salinas, Roberto.

In: International Ophthalmology, Vol. 38, No. 3, 01.06.2018, p. 951-957.

Research output: Contribution to journalArticle

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T1 - Comparison of biometric measurements obtained by the Verion Image-Guided System versus the auto-refracto-keratometer

AU - Velasco-Barona, Cecilio

AU - Cervantes-Coste, Guadalupe

AU - Mendoza-Schuster, Erick

AU - Corredor-Ortega, Claudia

AU - Casillas-Chavarín, Nadia L.

AU - Silva-Moreno, Alejandro

AU - Garza-León, Manuel

AU - Gonzalez-Salinas, Roberto

PY - 2018/6/1

Y1 - 2018/6/1

N2 - 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.

AB - 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.

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Velasco-Barona C, Cervantes-Coste G, Mendoza-Schuster E, Corredor-Ortega C, Casillas-Chavarín NL, Silva-Moreno A et al. Comparison of biometric measurements obtained by the Verion Image-Guided System versus the auto-refracto-keratometer. International Ophthalmology. 2018 Jun 1;38(3):951-957. https://doi.org/10.1007/s10792-017-0541-3