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AbstractDO.03.08 Conception of a mechatronic microsystem to restore human accommodation Klink S.1, Bergemann M.1, Gengenbach U.1, Guth H.1, Rückert W.1, Sieber I.1, Bretthauer G.1, Guthoff R.2
1Institute for Applied Computer Science, Forschungszentrum Karlsruhe GmbH, 2Ophthalmic hospital, University of Rostock Objective: Cataract and presbyopia get more and more important in an ageing society. A new approach to restore human accommodation is to implant a mechatronic microsystem (Artificial Accommodation System) instead of a conventional intraocular lens. This system consists of an active optical element with an actuator, a measurement system to get information about the accommodation demand and an energy supply. This system does not rely on the ciliary muscle movements.
Methods: To restore vision for different distances, the components of the artificial accommodation system have to satisfy several restrictions, which concern amongst others accuracy and amplitude of accommodation, optical quality, reliability, adaptibility to different patients and the delay of accommodation response. The components cannot be regarded as independent, hence a conception of the complete system was necessary. Different solutions have been developed which meet the requirements.
Results: One of these solutions is presented in this article. An optical system including Alvarez-Humphrey surfaces and an polymer actuator leads to a sufficient amplitude of accommodation and small lateral shifts. The accommodation demand can be measured by small electronic compass sensors within each eye detecting the rotation angles of the eyes. The necessary transfer of information between the systems can be accomplished by a coil in one implant and the magnetic sensors in the other implant. The energy density of lithium-polymer accumulators within the remaining volume is sufficient to power the system for one week with the aimed energy consumption. The accumulator can be recharged by an external system via magnetic induction using the coil in the implant.
Conclusions: An implantable mechatronic microsystem which restores human accommodation is feasible and has a high potential to improve the quality of life in advanced years.
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