Abstract

P 082

Alvarez-Humphrey optic for the artificial accommodation system – optical simulations and design

Sieber I., Guth H.
Institut für Angewandte Informatik, Forschungszentrum Karlsruhe GmbH

Objective: The design of an optical system with tunable refraction power for use in a mechatronic microsystem for the recovery of the ability of accommodation (Artificial Accommodation System), must meet several requirements: ensuring the optical imaging quality, maintaining the boundary condition of the actuator used to adjust the desired refraction power, ensuring the post-operative balance of refraction and of an accommodation amplitude of at least 3dpt, maintaining a total axial thickness of the optical system of at most 2mm, and the adaptability of the lens system to the biometrical data surveyed pre-operational. The objective of this work is the design of an Alvarez-Humphrey optic under consideration of the above mentioned requirements. The desired change in refraction power can be adjusted by a lateral movement of two lens surfaces, which are conjugated to each other.
Methods: Optical modelling of the dioptric apparatus is carried out by means of the optical simulation software ZEMAX-EE. The ray-tracing algorithm used allows for the consideration of aberrational effects. The lens system is optimised with respect to the above-mentioned system requirements. The optical imaging quality is quantified by means of the modulation transfer function.
Results: It will be shown by the simulation results that two different approaches of the Alvarez-Humphrey optic meet the criteria set to an optical system with tunable refraction power for the mechatronic system: 1. Alvarez-Humphrey optic in aqueous fluid: the resulting advantage of the simple setup is achieved on cost of an increase in the axial thickness of the lens system. 2. Alvarez-Humphrey optic packaged, charged by air: on cost of a more complex setup (packaging) a decrease in thickness and the potential of foldable optics can be achieved. Both design approaches result in actuation paths that allow the application of polymeric bending actuators.
Conclusions: The Alvarez-Humphrey principle meets the criteria defined for an optical system with tunable refraction power for use in the Artificial Accommodation System. Packaging of the optics leads to a decrease in axial thickness and therefore enables the potential of folding.

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