RT info:eu-repo/semantics/article
T1 Reliability and agreement of apparent chord mu measurements between static and dynamic evaluations
A1 Martínez Plaza, Elena
A1 Marcos, Mario
A1 López De La Rosa, Alberto
A1 López Miguel, Alberto
A1 Maldonado López, Miguel José
K1 Chord mu
K1 Scheimpflug and Placido-disk technology
K1 repeatability
K1 agreement
AB Purpose: To assess the repeatability and agreement of Cartesian coordinates and the length of apparent chord mu and pupil diameter measurements during static (Galilei G4) and dynamic (Topolyzer Vario) evaluations.Setting: IOBA-Eye Institute, Valladolid, Spain.Design: Case series.Methods: 3 consecutive measurements per scenario (Galilei G4 and Topolyzer Vario under low mesopic and photopic conditions) were performed by the same clinician. The intrasession repeatability was assessed using the within-subject SD (Sw), the precision, the coefficient of variation, and the intraclass correlation coefficient (ICC). The agreement was analyzed using repeated-measures analysis of variance and the Bland-Altman method.Results: Thirty-seven healthy participants were recruited. The Sw values for chord mu parameters and pupil diameter ranged from 0.01 to 0.03 and 0.08 to 0.21, respectively. The ICC was ≥0.89 for all parameters. Galilei G4 and Topolyzer Vario under low mesopic and photopic conditions provided significantly different measures of apparent chord mu length (0.23 ± 0.11 mm, 0.30 ± 0.10 mm, and 0.25 ± 0.11 mm, respectively, P ≤ .02), X-coordinate (-0.18 ± 0.12 mm, -0.27 ± 0.11 mm, and -0.21 ± 0.12 mm, respectively, P < .001), and pupil diameter (3.38 ± 0.50 mm, 6.29 ± 0.60 mm, and 3.04 ± 0.41 mm, respectively, P < .001). Y-coordinate values obtained by Galilei G4 and Topolyzer Vario under low mesopic conditions were significantly different (0.06 ± 0.13 mm vs 0.03 ± 0.11 mm, respectively, P = .02), in contrast to Galilei G4 and Topolyzer Vario under photopic conditions (0.05 ± 0.13 mm, P = .82) and both illumination conditions of Topolyzer Vario (P ≥ .23).Conclusions: Galilei G4 and Topolyzer Vario provide consistent measurements of apparent chord mu Cartesian coordinates and length, as well as pupil diameter; however, the measurements are not interchangeable. Ophthalmic surgeons should consider these findings when planning customized intraocular lens implantation and refractive surgery procedures.
SN 0886-3350
YR 2023
FD 2023
LK https://uvadoc.uva.es/handle/10324/75174
UL https://uvadoc.uva.es/handle/10324/75174
LA eng
NO Journal of Cataract & Refractive Surgery, 2023, vol. 49, n. 1, p. 21-28.
DS UVaDOC
RD 09-abr-2025