title: [Energy and memory efficient calculation of the accommodation demand in the artificial accommodation system].
abstract: Presbyopia and cataract are gaining more and more importance in the ageing society. Both age-related complaints are accompanied with a loss of the eye's ability to accommodate. A new approach to restore accommodation is the Artificial Accommodation System, an autonomous micro system, which will be implanted into the capsular bag instead of a rigid intraocular lens. The Artificial Accommodation System will, depending on the actual demand for accommodation, autonomously adapt the refractive power of its integrated optical element. One possibility to measure the demand for accommodation non-intrusively is to analyse eye movements. We present an efficient algorithm, based on the CORDIC technique, to calculate the demand for accommodation from magnetic field sensor data. It can be shown that specialised algorithms significantly shorten calculation time without violating precision requirements. Additionally, a communication strategy for the wireless exchange of sensor data between the implants of the left and right eye is introduced. The strategy allows for a one-sided calculation of the demand for accommodation, resulting in an overall reduction of calculation time by 50 %. The presented methods enable autonomous microsystems, such as the Artificial Accommodation System, to save significant amounts of energy, leading to extended autonomous run-times.
authors.affiliation: Institut für Angewandte Informatik, Karlsruher Institut für Technologie, Eggenstein-Leopoldshafen. joerg.nagel@kit.edu
authors.forename: J A
authors.initials: JA
authors.lastname: Nagel
authors.forename: C
authors.initials: C
authors.lastname: Beck
authors.forename: H
authors.initials: H
authors.lastname: Harms
authors.forename: P
authors.initials: P
authors.lastname: Stiller
authors.forename: H
authors.initials: H
authors.lastname: Guth
authors.forename: O
authors.initials: O
authors.lastname: Stachs
authors.forename: G
authors.initials: G
authors.lastname: Bretthauer
mesh_terms: D000065:Accommodation, Ocular; D000465:Algorithms; D017076:Computer-Aided Design; D011211:Electric Power Supplies; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D007910:Lenses, Intraocular; D055617:Micro-Electrical-Mechanical Systems / Q000295:instrumentation*; D012030:Refractive Errors / Q000534:rehabilitation*; D057488:Visual Prosthesis