Dresden 2020 – scientific programme
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BP: Fachverband Biologische Physik
BP 20: Poster VIII
BP 20.18: Poster
Tuesday, March 17, 2020, 14:00–16:00, P2/4OG
Wavelength and pressure dependent measurement of the retinal radiation exposure during diaphanoscopic illumination — •Nicole Sieber1, Philipp Kölbl1, Christian Lingenfelder2, Kathrin Stucke-Straub3, Sebastian Kupferschmid4, and Martin Hessling1 — 1Institute of Medical Engineering and Mechatronics, Ulm University of Applied Sciences, 89081 Ulm, Germany — 2Pharmpur GmbH, 86343 Koenigsbrunn, Germany — 3Department of Mathematics, Natural and Economic Sciences, Ulm University of Applied Sciences, 89081 Ulm, Germany — 4Clinic of Ophthalmology, Bundeswehrkrankenhaus Ulm, 89081 Ulm, Germany
In vitreoretinal surgery the imaging of the ocular fundus is of great interest. Therefore, sufficient bright illumination of the intraocular space is necessary. However, excessive irradiance can cause irreversible photochemical and thermal damage to the retina. In the international standard DIN EN ISO 15007-2: 2014 limit values for the irradiance of the retina are given. These values must not be exceeded during surgery. In fact, the actual intraocular irradiance caused by ophthalmological illumination systems has never been determined. In this study the retinal irradiances during diaphanoscopic illumination through the porcine eye wall is investigated. The irradiance is wavelength and pressure dependent if the illuminator is pressed against the eyeball. The irradiance is measured spectrally resolved for different pressures inside eyes to assess the photochemical and thermal retinal hazard. These data also permit calculating the appropriate application time of the illumination system during eye surgery.