Programm                 "Degeneration und Regeneration– Grundlagen, Diagnostik und Therapie"

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Intraocular Vision Aid – Development of Components and System Assembly

Krisch I.1, Schmid A.1, Hosticka B.1, Buß R.2, Prämaßing F.2, Püttjer D.2, Jäger D.2
1Fraunhofer Institut Mikroelektronische Schaltungen und Systeme, Duisburg; 2Universität Duisburg-Essen, Zentrum für Halbleitertechnik und Optoelektronik, Duisburg

Purpose: Incurable opacity as well as cicatrisation of the cornea, as for example after corrosion or chronic intraocular inflammations, frequently lead to blindness. The development of an intraocular visual aid (IOVA) can improve the life situation of blind patients with intact retinal function. In order to gain patients’ acceptance the system has to be miniaturized to a magnitude that external components can be integrated into a portable unit, and that the microsystem can be implanted into the eyeball.
Method: A high dynamic range CMOS camera captures live images of the scenery. By means of a transmission module these image data are processed and compressed. Then they are transmitted wireless via infrared coupling to the implant which is embedded into an artificial lens. Here the received signals are used to drive an array of light emitting diodes (LEDs) via an appropriate driver circuit. This LED array employs a suitable micro-optical system to project the images onto the patient’s retina. The implant is powered wireless by using RF-techniques.
Results: The camera contains an CMOS image sensor with a resolution of 360 x 280 pixels. Outstanding features

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