| Aims To evaluate the intraobserver repeatability of a new optical low-coherence reflectometry (OLCR) device Lenstar LS 900 and assess the agreement of it with partial coherence interferometry (PCI) device IOLMaster and high-resolution rotating Scheimpflug photography Pentacam.
Methods In a prospective study 62 eyes of 31 young phakic myopes scheduled for refractive surgery were examined with Lenstar LS 900 (Haag Streit AG) biometer and with the IOLMaster V.5 (Carl Zeiss Meditec AG). A subgroup of 56 eyes also had rotating Scheimpflug Pentacam-HR system (Oculus, Germany) performed. Intraobserver repeatability of the Lenstar measurements was assessed and Bland–Altman analysis was applied to assess agreement between the Lenstar and IOLMaster for axial length (AL), anterior chamber depth (ACD) epithelium to lens, keratometry readings of flattest and steepest meridian (K1 and K2) and white to white distance (WTW) as well as agreement between the Lenstar and Pentacam for central corneal thickness (CCT), ACD endothelium to lens, K1and K2.
Results The intraobserver repeatability of the Lenstar was better than 0.5% for AL and K values. It demonstrated less repeatable results for CCT while performed the most repeatable results for AL (respective coefficient of variation: 2.235% vs 0.069%). For all the variables studied, Lenstar agreement with IOLMaster is strongest, followed by those with Pentacam. The respective 95% limits of agreement (LoA) between the Lenstar and IOLMaster were -0.071 mm to 0.145 mm for AL, -0.158mm to 0.165 mm for ACD, -1.046 diopters (D) to 1.054 D for K1 and -1.179 D to 0.691 D for K2. The respective LoA between the Lenstar and Pentacam were -22.761 μm to 18.832 μm for CCT, -0.158 mm to 0.136 mm for ACD, -1.104D to 1.993 D for K1 and -1.285 D to 1.529 D for K2.
Conclusions The intraobserver repeatability of the Lenstar was excellent. It exhibited a good agreement with measures derived from IOLMaster and Pentacam in a population of young myopes. Optical low-coherence reflectometry device might become a promising new instrument for biometric measurement before refractive surgery or for evaluating myopia progression. |
