Dresden 2020 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 20: Poster VIII

BP 20.18: Poster

Dienstag, 17. März 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.