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Letter to the Editor
DOI: 10.1016/j.optom.2020.05.002
Open Access
Available online 3 June 2020
Reply to: “Agreement analysis”
Respuesta a: “Análisis de concordancia”
Hassan Hashemia, Samira Heydarianb, Abbas Ali Yektac, Mohamadreza Aghamirsalimd, Mahin Ahmadi-Pishkuhia, Mehrnaz Valadkhana, Hadi Ostadimoghaddame, Ahmad Ahmadzadeh Amirif, Mehdi Khabazkhoobg,
Corresponding author

Corresponding author.
a Noor Research Center for Ophthalmic Epidemiology, Noor Eye Hospital, Tehran, Iran
b Department of Rehabilitation Science, School of Allied Medical Sciences, Mazandaran University of Medical Sciences, Sari, Iran
c Department of Optometry, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran
d Eye Research Center, Tehran University of Medical Sciences, Tehran, Iran
e Refractive Errors Research Center, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran
f Department of Ophthalmology, Faculty of Medicine, Mazandaran University of Medical Sciences, Sari, Iran
g Department of Medical Surgical Nursing, School of Nursing and Midwifery, Shahid Beheshti University of Medical Sciences, Iran
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Thank you for reading the article. The objective of this study was not to show agreement through reporting the Pearson's correlation coefficient. Generally, agreement is not a point when there is a weak correlation, and a strong correlation dies not indicate agreement. Sometimes there is a strong correlation but there is a difference between two devices. The presence of a strong correlation yet a large difference indicates bias, which can be overcome through calibration. ICC is mostly used for repeatability and is less commonly used for agreement. Of course, some studies have used ICC for agreement, which is not correct.

Copyright © 2020. Spanish General Council of Optometry
Journal of Optometry

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