Inter-instrument agreement of anterior corneal curvature measurements:  Topographer, auto kerato-refractometer and manual keratometer

Phongvarin  Naksaranyuyottana; Thareerat   Raktrakulwitthaya; Phatthanakan Klongkidpanich; Phanchita  Phuwasinsawad; Chutiralai  Ketru; Supasin  Jeak-in; Pichit  Boonkrong

Authors

Phongvarin Naksaranyuyottana Faculty of Optometry, Rangsit University, Patumthani 12000, Thailand
Thareerat Raktrakulwitthaya Faculty of Optometry, Rangsit University, Patumthani 12000, Thailand
Phatthanakan Klongkidpanich Faculty of Optometry, Rangsit University, Patumthani 12000, Thailand
Phanchita Phuwasinsawad Faculty of Optometry, Rangsit University, Patumthani 12000, Thailand
Chutiralai Ketru Faculty of Optometry, Rangsit University, Patumthani 12000, Thailand
Supasin Jeak-in Faculty of Optometry, Rangsit University, Patumthani 12000, Thailand
Pichit Boonkrong College of Digital Innovation and Information Technology, Rangsit University, Patumthani 12000, Thailand

Keywords:

auto kerato-refractometer, Bland-Altman analysis, corneal curvature measurements, inter-instrument agreement, manual keratometer, topographer

Abstract

In this paper, inter-instrument agreement among topographer, auto kerato-refractometer and manual keratometer are the main concerns. The corneal steep, flat and average powers from the 61 right eyes of 61 healthy undergraduate students at Rangsit University were measured by three different instruments. In statistical analysis, measurement concordance and correlation between pairs of instruments were analyzed by Bland-Altman analysis. Intraclass correlation coefficient and paired t-test analysis were also performed. It was found that the three instruments showed indifferent mean corneal steep and flat and average powers at a significance level of 0.05. Therefore, topographer, auto kerato-refractometer and manual keratometer can be practically interchangeable.

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