Background/aims: Evaluation of the reproducibility of the Lenstar LS 900 non-contact biometer, and a comparison with the Visante anterior-segment Optical Coherence Tomography (AS-OCT) and the IOLMaster.
Methods: Central corneal thickness (CCT), anterior chamber depth (ACD), lens thickness (LT), keratometry (K)-values, corneal diameter (CD), and axial length (AL) were obtained in 38 healthy volunteers (76 eyes) to determine the reproducibility of the Lenstar. CCT, ACD, CD, K-values, and AL measurements measured with the Lenstar were compared to the AS-OCT and IOLMaster. Intraocular lens (IOL) power calculations were done to study the significance of the difference between AL measurements.
Results: Reproducibility of the Lenstar was better than 0.9% for CCT, ACD, LT, K-values, and AL measurements. Although all correlations were highly significant (P <0.001), all comparisons showed a significant difference, except for the comparison of CD measurements using the Lenstar and IOLMaster (P=0.175). The difference in IOL power calculations for an AL of 20, 25, and 30 mm with a mean difference between Lenstar and IOLMaster AL measurements of 0.03 mm, were 0.13 D, 0.10 D, and 0.08 D, respectively.
Conclusion: Reproducibility of the Lenstar was excellent. Small but significant differences exist between the Lenstar, Visante OCT and the IOLMaster. Therefore, measurements of the the Lenstar, AS-OCT, and IOLMaster are not interchangeable. Despite the significant difference between AL measurements, there is no clinically significant difference in the IOL power calculation results.