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Abstract
Abstract
The Haptic Element Differentiation of Potentially Accommodative IOLs Using Three-dimensional High Frequency Ultrasound
Stachs O., Stave J., Beck R. und Guthoff R. F.
Augenklinik, Universität Rostock
Purpose: High frequency ultrasound is the only tool to localize IOL haptic positions hidden behind the iris diaphragm. But the evaluation of the ultrasonographically data is difficult. The principal ability of potentially accommodative IOLs bases on an axial shift of the IOL optic induced by the ciliary body action in interaction with a reversible change in haptic angulation. The aim of this study was to investigate the accommodative performance of this new IOL generation.
Method: The authors have designed a test device to study IOL performance (1CU, HumanOptics; AT-45, C&C Vision) experimentally using an artificial capsular bag and a streching device. These results are transmitted to elucidate the so far questionable in vivo situation in patients with accommodative implants.
Results: The 3D high resolution presentation of the anterior segment of eye allows a seperation of the IOL haptic elements. The authors are able to distinguish and to analyse the haptic position and angulation in consideration of the accommodation state. In the selected in vivo cases a change in haptic angulation <12° was found.
Conclusions: The used simulation model in combination with the 3D ultrasound biomicroscopy provide information about the potential of accommodative IOL designs. Conclusions corresponding changes in haptic angulation during accommodatio