Consistency analysis of Kappa angle measurement by Pentacam and Keratron Scout

• Main Authors: Jiao Zhao, Geng-Sheng Hao, Li Zeng, Zong-Shun Liu, Bu-Dan Hu, Ke Mao
• Format: Article
• Language: English
• Published: Press of International Journal of Ophthalmology (IJO PRESS) 2019-07-01
• Series: Guoji Yanke Zazhi
• Subjects: Pentacam Front Section Analyzer; Keratron Scout Corneal Topographer; Kappa angle; agreement; repeatability
• Online Access: http://ies.ijo.cn/cn_publish/2019/7/201907043.pdf

AIM: To investigate the repeatability and agreement of Pentacam Front Section Analyzer and Keratron Scout Corneal Topographer in measuring Kappa angle.<p>METHODS: Totally 69 patients were randomly selected from Ophthalmology Department of Leshan People's Hospital. Three readings were taken by the same examiner. Results were recorded in(<i>X</i>, <i>Y</i>)coordinates format and assessed by intraclass correlation coefficient(ICC), Cronbach's Alpha Coefficient, <i>t-</i>test, Pearson correlation analysis and bland-altman analysis.<p>RESULTS: Both instruments showed excellent repeatability in Kappa angle assessment. The results significantly correlated(<i>X</i> value: <i>r</i>=0.90,<i> P</i><0.01; <i>Y</i> value: <i>r</i>=0.91, <i>P</i><0.01), however, no significant difference were found between the two instruments. The widest 95% LoA was -0.11-0.14mm for <i>X</i> coordinate and -0.10-0.11mm for <i>Y</i>.<p>CONCLUSION: Pentacam and Keratron Scout showed excellent repeatability and agreement in Kappa angle assessment. The two instruments could aid and verify each other.