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.
letter . 2020 Jun 2;13(4):277. doi: 10.1016/j.optom.2020.05.002
Reply to: “Agreement analysis”
Respuesta a: “Análisis de concordancia”
Hassan Hashemi
a, Samira Heydarian
b, Abbas Ali Yekta
c, Mohamadreza Aghamirsalim
d, Mahin Ahmadi-Pishkuhi
a, Mehrnaz Valadkhan
a, Hadi Ostadimoghaddam
e, Ahmad Ahmadzadeh Amiri
f, Mehdi Khabazkhoob
g,⁎
Hassan Hashemi
aNoor Research Center for Ophthalmic Epidemiology, Noor Eye Hospital, Tehran, Iran
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Samira Heydarian
bDepartment of Rehabilitation Science, School of Allied Medical Sciences, Mazandaran University of Medical Sciences, Sari, Iran
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Abbas Ali Yekta
cDepartment of Optometry, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran
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Mohamadreza Aghamirsalim
dEye Research Center, Tehran University of Medical Sciences, Tehran, Iran
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Mahin Ahmadi-Pishkuhi
aNoor Research Center for Ophthalmic Epidemiology, Noor Eye Hospital, Tehran, Iran
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Mehrnaz Valadkhan
aNoor Research Center for Ophthalmic Epidemiology, Noor Eye Hospital, Tehran, Iran
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Hadi Ostadimoghaddam
eRefractive Errors Research Center, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran
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Ahmad Ahmadzadeh Amiri
fDepartment of Ophthalmology, Faculty of Medicine, Mazandaran University of Medical Sciences, Sari, Iran
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Mehdi Khabazkhoob
gDepartment of Medical Surgical Nursing, School of Nursing and Midwifery, Shahid Beheshti University of Medical Sciences, Iran
Find articles by Mehdi Khabazkhoob
aNoor Research Center for Ophthalmic Epidemiology, Noor Eye Hospital, Tehran, Iran
bDepartment of Rehabilitation Science, School of Allied Medical Sciences, Mazandaran University of Medical Sciences, Sari, Iran
cDepartment of Optometry, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran
dEye Research Center, Tehran University of Medical Sciences, Tehran, Iran
eRefractive Errors Research Center, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran
fDepartment of Ophthalmology, Faculty of Medicine, Mazandaran University of Medical Sciences, Sari, Iran
gDepartment of Medical Surgical Nursing, School of Nursing and Midwifery, Shahid Beheshti University of Medical Sciences, Iran
⁎
Corresponding author. Khabazkhoob@yahoo.com
Issue date 2020 Oct-Dec.
© 2020 Spanish General Council of Optometry. Published by Elsevier España, S.L.U.
This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
PMCID: PMC7520515 PMID: 32507614
See "Agreement analysis" on page 276.
