14 January 1998 Removal of vitreous body by IR laser radiation
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The common method to remove the vitreous body of the eye (vitrectomy) is based on mechanical cutting and pulling of the tissue. Since this involves the risk of mechanical violation it can not be performed in close contact to the retina. This limitation should not exist for erbium laser radiation due to its short penetration depth. A flashlamp pumped, pulsed free- running erbium:YAG laser was used at a wavelength of 2.94 micrometer. Three different pulse length were used. The measurements were performed at freshly enucleated porcine vitreous bodies stored in cooled saline water. The ablation rate was taken by a high precision scale. The same experiments were performed with saline water replacing the vitreous body. Pulse energies under 25 mJ were ignored. The ablation rates did hardly differ here from the results measuring the evaporation of water. Energies above 125 mJ per pulse caused a visible movement of the surface. Therefore this energy range was not included in the experiment. The ablation rate was observed to increase linear with higher pulse energies and shorter pulse lengths. The ablation energy per mass decreases linear with increasing pulse energy for all pulse length. The results show that it is possible to ablate the vitreous body. It should be possible to perform the ablation process in less than half an hour.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Diana Steeb, Diana Steeb, Hans-Jochen Foth, Hans-Jochen Foth, M. Krause, M. Krause, J. Weindler, J. Weindler, } "Removal of vitreous body by IR laser radiation", Proc. SPIE 3195, Laser-Tissue Interaction, Tissue Optics, and Laser Welding III, (14 January 1998); doi: 10.1117/12.297903; https://doi.org/10.1117/12.297903

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