[1] Tampere Univ Technol, BioMediTech, Elect & Commun Engn, FIN-33101 Tampere, Finland
[2] UCL, Inst Ophthalmol, London, England
[3] Univ Tampere, BioMediTech, FIN-33101 Tampere, Finland
[4] Moorfields Eye Hosp, London, England
[5] Charite, Expt Ophthalmol, D-13353 Berlin, Germany