Estudio comparativo de la medición del poder corneal central usando el queratómetro manual, el IOLMaster® y el tomógrafo Sirius®

Translated title of the contribution: Comparative study of the measurement of central corneal power using the manual keratometer, the IOLMaster® and Sirius® tomography

Manuel Garza-León, Paola de la Parra-Colín, Tonatiuh Barrientos-Gutierrez

Research output: Contribution to journalArticle

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Abstract

© 2015. Objective: To assess the repeatability and comparability of the central keratometric power measurements obtained from a novel Scheimpflug camera with a Placido-disc topographer (Sirius®), manual keratometer and IOLMaster®. Material and methods: In a sample of 30 unoperated eyes of healthy subjects, the central corneal power was analyzed by a single examiner using the Sirius®, the manual keratometer and the IOLMaster®. Repeatability of 3 sets of measurements from each device were evaluated using the coefficient of variation, standard deviation, and intraclass correlation coefficient. T-test with Bonferrioni adjustment and Bland and Altman plots were used to assess agreement between devices. Results: All instruments showed high reproducibility with coefficient of variation less than 0.30% for all measurements (0.291% and 0.237%, 0.238% and 0.361%, 0.238% and 0.208% for the flattest (FK) and steepest keratometry of Sirius®, manual keratometer and IOLMaster®respectively) and a higher intraclass correlation coefficient of 0.95 in all measurements. The manual keratometer has the lowest keratometric power (FK 41,988 and SK 43,277 D), followed by Sirius®(FK 42.285 D and SK 43.510 D) and finally the IOLMaster®(FK 42.483 D and SK 43.763 D), with a statistically significant differences. Conclusion: In the assessment of normal corneas, central corneal power measured with this 3 devices showed high repeatability however there was no agreement between the equipments and the differences were statistically significant.
Original languageSpanish
Pages (from-to)111-117
Number of pages7
JournalRevista Mexicana de Oftalmologia
Volume90
Issue number3
DOIs
Publication statusPublished - 1 May 2016

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Tomography
Equipment and Supplies
Cornea
Healthy Volunteers

All Science Journal Classification (ASJC) codes

  • Ophthalmology

Cite this

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title = "Estudio comparativo de la medici{\'o}n del poder corneal central usando el querat{\'o}metro manual, el IOLMaster{\circledR} y el tom{\'o}grafo Sirius{\circledR}",
abstract = "Objective: To assess the repeatability and comparability of the central keratometric power measurements obtained from a novel Scheimpflug camera with a Placido-disc topographer (Sirius{\circledR}), manual keratometer and IOLMaster{\circledR}. Material and methods: In a sample of 30 unoperated eyes of healthy subjects, the central corneal power was analyzed by a single examiner using the Sirius{\circledR}, the manual keratometer and the IOLMaster{\circledR}. Repeatability of 3 sets of measurements from each device were evaluated using the coefficient of variation, standard deviation, and intraclass correlation coefficient. T-test with Bonferrioni adjustment and Bland and Altman plots were used to assess agreement between devices. Results: All instruments showed high reproducibility with coefficient of variation less than 0.30{\%} for all measurements (0.291{\%} and 0.237{\%}, 0.238{\%} and 0.361{\%}, 0.238{\%} and 0.208{\%} for the flattest (FK) and steepest keratometry of Sirius{\circledR}, manual keratometer and IOLMaster{\circledR} respectively) and a higher intraclass correlation coefficient of 0.95 in all measurements. The manual keratometer has the lowest keratometric power (FK 41,988 and SK 43,277 D), followed by Sirius{\circledR} (FK 42.285 D and SK 43.510 D) and finally the IOLMaster{\circledR} (FK 42.483 D and SK 43.763 D), with a statistically significant differences. Conclusion: In the assessment of normal corneas, central corneal power measured with this 3 devices showed high repeatability however there was no agreement between the equipments and the differences were statistically significant. {\circledC} 2015.",
author = "Manuel Garza-Le{\'o}n and {de la Parra-Col{\'i}n}, Paola and Tonatiuh Barrientos-Gutierrez",
year = "2016",
month = "5",
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doi = "10.1016/j.mexoft.2015.05.011",
language = "Spanish",
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pages = "111--117",
journal = "Revista Mexicana de Oftalmologia",
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Estudio comparativo de la medición del poder corneal central usando el queratómetro manual, el IOLMaster® y el tomógrafo Sirius®. / Garza-León, Manuel; de la Parra-Colín, Paola; Barrientos-Gutierrez, Tonatiuh.

In: Revista Mexicana de Oftalmologia, Vol. 90, No. 3, 01.05.2016, p. 111-117.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Estudio comparativo de la medición del poder corneal central usando el queratómetro manual, el IOLMaster® y el tomógrafo Sirius®

AU - Garza-León, Manuel

AU - de la Parra-Colín, Paola

AU - Barrientos-Gutierrez, Tonatiuh

PY - 2016/5/1

Y1 - 2016/5/1

N2 - Objective: To assess the repeatability and comparability of the central keratometric power measurements obtained from a novel Scheimpflug camera with a Placido-disc topographer (Sirius®), manual keratometer and IOLMaster®. Material and methods: In a sample of 30 unoperated eyes of healthy subjects, the central corneal power was analyzed by a single examiner using the Sirius®, the manual keratometer and the IOLMaster®. Repeatability of 3 sets of measurements from each device were evaluated using the coefficient of variation, standard deviation, and intraclass correlation coefficient. T-test with Bonferrioni adjustment and Bland and Altman plots were used to assess agreement between devices. Results: All instruments showed high reproducibility with coefficient of variation less than 0.30% for all measurements (0.291% and 0.237%, 0.238% and 0.361%, 0.238% and 0.208% for the flattest (FK) and steepest keratometry of Sirius®, manual keratometer and IOLMaster® respectively) and a higher intraclass correlation coefficient of 0.95 in all measurements. The manual keratometer has the lowest keratometric power (FK 41,988 and SK 43,277 D), followed by Sirius® (FK 42.285 D and SK 43.510 D) and finally the IOLMaster® (FK 42.483 D and SK 43.763 D), with a statistically significant differences. Conclusion: In the assessment of normal corneas, central corneal power measured with this 3 devices showed high repeatability however there was no agreement between the equipments and the differences were statistically significant. © 2015.

AB - Objective: To assess the repeatability and comparability of the central keratometric power measurements obtained from a novel Scheimpflug camera with a Placido-disc topographer (Sirius®), manual keratometer and IOLMaster®. Material and methods: In a sample of 30 unoperated eyes of healthy subjects, the central corneal power was analyzed by a single examiner using the Sirius®, the manual keratometer and the IOLMaster®. Repeatability of 3 sets of measurements from each device were evaluated using the coefficient of variation, standard deviation, and intraclass correlation coefficient. T-test with Bonferrioni adjustment and Bland and Altman plots were used to assess agreement between devices. Results: All instruments showed high reproducibility with coefficient of variation less than 0.30% for all measurements (0.291% and 0.237%, 0.238% and 0.361%, 0.238% and 0.208% for the flattest (FK) and steepest keratometry of Sirius®, manual keratometer and IOLMaster® respectively) and a higher intraclass correlation coefficient of 0.95 in all measurements. The manual keratometer has the lowest keratometric power (FK 41,988 and SK 43,277 D), followed by Sirius® (FK 42.285 D and SK 43.510 D) and finally the IOLMaster® (FK 42.483 D and SK 43.763 D), with a statistically significant differences. Conclusion: In the assessment of normal corneas, central corneal power measured with this 3 devices showed high repeatability however there was no agreement between the equipments and the differences were statistically significant. © 2015.

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