To compare the Kappa Angle consistency measuring using Pentacam front section analyzer and Topolyzer corneal topography instrument.

Prospective controlled study. All 29 patients with refractive error (57 eyes) from the Department of Ophthalmology in Quanzhou#180 Hospital were received femtosecond laser refractive surgery from June 2015 to Au-gust 2015 were measured Kappa Angle using Pentacam and Topolyzer, and applied Topolyzer iris location model to acquire image and imported EX500 excimer laser iris location cutting pattern to generate Kappa Angle by the same inspectors respectively. The consistency was evaluated by using three methods of Kappa Angle (vertical level X and Y values) Intraclass correlation coefficient and Bland-Altman analysis method.

Intraclass correlation coefficient analysis of three sets of X and Y values was uniform. X 95% LoA1 of group 2 was-0.14~ 0.09; Group 1 and 3 was-0.15~ 0.12; Group 2 and group 3 was-0.10~ 0.11. Y value 95% LoA of group 1 and group 2 was-0.14~ 0.03; Group 1 and group 3 was-0.17~ 0.08; Group 2 and group 3 was-0.10~ 0.11 by Bland-Altman analysis method.

The three methods of measuring results are consistent, can substitute, correct and supplement each other. Pentacam front section analyzer and Topolyzer corneal topography can obtain accurate Kappa Angle data.

Pentacam front section analyzer; Topolyzer corneal topography; Kappa Angle