Abstract:

 Objective To compare horizontal corneal diameter [white-to-white (WTW) distance] measurements with measuring caliper, IOLMaster, and Pentacam in the patients before ICL implantation. Design Diagnostic test. Participants 23 cases (46 eyes) who underwent ICL implantation. Methods The preoperative horizontal corneal diameter was measured using measuring caliper, IOLMaster, and Pentacam. Analysis of the correlation and agreement were performed. Main Outcome Measures 95% limit of agreement (LoA). Results The mean WTW distance measurements were (11.60±0.34) mm as obtained with measuring caliper and (11.54±0.32) mm with Pentacam and (11.94 ± 0.35) mm with IOLMaster. Measuring caliper versus Pentacam, measuring caliper versus IOLMaster , Pentacam versus IOLMaster  were highly correlated (r=0.895， 0.874, 0.897, respectively. all P=0.000). The 95% LoA for caliper versus Pentacam, caliper versus IOLMaster, Pentacam versus IOLMaster was (-0.24, 0.36) mm，(-0.68, 0.01) mm，(-0.70, -0.09) mm respectively. Conclusion Measuring caliper and Pentacam can be used interchangeably to measure WTW in clinical practice. Measuring caliper and IOLMaster, Pentacam and IOLMaster cannot be considered interchangeable, when it comes to measure WTW. (Ophthalmol CHN, 2017, 26: 252-255)

Key words: corneal diameter, IOLMaster, Pentacam