Repeatability and Agreement of Central Vault for Implantable Collamer Lens Obtained by the Tomey OA-2000 Biometer and Spectralis OCT.

Objective: To assess repeatability and agreement of central vault for implantable collamer lens (ICL) measured by the Tomey OA-2000 biometry and Spectralis optical coherence tomography (OCT). Methods: In this prospective study, the central vault was measured by the Tomey OA-2000 biometer and Spectralis OCT in 84 eyes (43 patients) after ICL implantation at six month follow-up. Three consecutive scans were obtained by one experienced technician using Tomey OA-2000 and the Spectralis OCT in the same day. The coefficient of variation (CoV), intraclass correlation coefficient (ICC), within-subject standard deviation (Sw), and 2.77 Sw were calculated to assess the repeatability and reproducibility. The paired t-test and Bland-Altman plots were used to analyze the differences and agreements of central vault measured by two devices. Results: Repeatability of the central vault measured by Tomey OA-2000 biometer and Spectralis OCT showed that the CoV was 2.71% and 1.66%, respectively. The ICC for both devices was 0.996 and 0.999, respectively. The paired t-test showed that central vault measured by Tomey OA-2000 biometer was -7.25 ± 23.57 microns lower than that measured by Spectralis OCT (P = 0.006). The mean difference between measurements for Tomey OA-2000 and ASM-OCT with 95% limits of agreement (LoAs) was -38.94 to 53.44 µm. Conclusion: Both Tomey OA-2000 biometer and Spectralis OCT displayed good repeatability for the measurement of central vault of ICL. Good reliability and agreement were observed between Tomey OA-2000 biometer and Spectralis OCT. Both instruments are useful but not replaced each other for central vault measurements.

Helical catena-poly[[tris(1H-benzimidazole-kappaN(3))cobalt(II)]-micro-maleato-kappa(3)O,O':O"].

The crystal structure of the title compound, [Co(C(4)H(2)O(4))(C(7)H(6)N(2))(3)](n), consists of polymeric chains of the Co(II) complex. Two maleate dianions and three benzimidazole ligands coordinate to the Co(II) atom with a distorted octahedral geometry. The maleate dianions bridge neighbouring Co(II) atoms via both terminal carboxylic acid groups, one of which is monodentate and the other bidentate, to form a helical structure of alternating maleate dianions and Co(II) atoms, with a pitch height of 9.2667 (17) A. The absolute structure has been determined, and the crystal contains only right-handed helices. Intrahelical N-H...O hydrogen bonds stabilize the helical structure, while interhelical N-H...O hydrogen bonds link neighbouring helices to form the supramolecular structure.