Biometrie des vorderen Augensegmentes zur Implantation phaker Vorderkammerlinsen

Abstract

Implantation of phakic intraocular lenses (pIOL) is gaining in importance. Exact measurement of the anterior chamber is important to assure safe and effective pIOL implantation. In this study six currently available diagnostic devices were tested in order to compare accuracy of measurements (anterior chamber depth and diameter) and ease of handling. In this study 100 eyes from 50 healthy patients were enrolled. All measurements were done by the same operator (L. K.) on the same day and under the same lighting conditions. The following devices were used to measure anterior chamber depth and diameter: IOLMaster 500, Visante OCT, UBM Vumax II, Galilei, Pentacam Classic und Orbscan IIz. Correlations between each method were assessed using Pearson's correlation. Bland Altman plots were composed to evaluate the range of agreement between two methods. The mean epithelial anterior chamber depth was 3.45 ± 0.38 mm with IOLMaster 500, 3.69 ± 0.33 mm with Visante OCT, 3.59 ± 0.35 mm with Pentacam, 3.67 ± 0,36 mm with Galilei, 3.48 ± 0.38 mm with Orbscan IIz and 3.52 ± 0.34 mm with UBM VumaxII. The mean white-to-white measurements were 11.98 ± 0.37 mm with IOLMaster 500 and 11.71 ± 0.36 mm with Orbscan IIz. The mean angle-to-angle distances were 11.83 ± 0. 43 mm with Visante OCT, 10.73 ± 0.38 mm with Pentacam, 12.30 ± 0.45 mm with Galilei, and 11.15 ± 0.52 mm with UBM Vumax II. In the Bland Altman plots the range of agreement was 0.5 mm between Visante OCT and IOLMaster 500, regarding anterior chamber depth as well as anterior chamber diameter. The IOLMaster 500 provides exact measurement of the anterior chamber depth and diameter and is easy to handle in the daily clinical routine.