97th DOG Annual Meeting 1999

V408

MOTION ARTEFACTS IN THE VITREOUS BODY DURING VITRECTOMY

P. Riedel, M. Mrochen, H. Petersen, T. Seiler

Movements and vibrations of intraocular structures can be observed during vitrectomy with mechanical cutting systems. The aim of this work was an experimental comparision of these intraocular motion artefacts between mechanical and Er:YAG laser vitrectomy.

Material and Method: The intraocular structures were reliabl simulated by a 0.9 mm wide foil (thickness 10 ┬Ám) in a water filled cuvette. The movements caused by commercal mechanical cutter systems could be compared with vibration caused by several laser surgery propes (laser pulse energy 20 mJ). Laser triangulation was used to messure the movements at various cutting rates of 2, 5 and 10 Hz and a constant suction force of 50 mmHg.

Results: We observed in all cases that the vibration frequence is the same as the cutting rate. The ratio of the maximal amplitude between laser surgery propes (AL) and mechanical cutter system (AM) is AL/AM = 0.3.

Conclusion: The reduced intraocular movements with the Er:YAG laser vitrectomy constitutes a potential advantage for the posterior segment surgery.

University of Dresden, Department of Ophthalmology, Fetscherstr. 74, D-01307 Dresden, Germany


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