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S. Caffey, P.A. A. Mello–Filho, J.V. Rossi, G.Y. Fujii, A. Barnes, R. Lakhanpal, M.S. Humayun, E. de Juan; USE OF NIGHT VISION IMAGE INTENSIFICATION TECHNOLOGY FOR RETINAL PROCEDURES . Invest. Ophthalmol. Vis. Sci. 2004;45(13):2807.
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Purpose: To determine the feasibility of night vision image intensification technology (IIT) using an infrared illumination system coupled with military grade generation III infrared intensification scopes in a vitreoretinal surgical setting. Methods: Three surgeons evaluated the night vision image intensification technology during a pars plana vitrectomy in a rabbit eye. The IIT comprises an external infrared illumination system using an 830nm infrared filter (attached to the coaxial microscope light) and two military grade SNS–1 generation III image intensification scopes (U.S. Night Vision, California) attached to a surgical microscope (Zeiss, Germany). Vitrectomy in the fellow eye performed by the same surgeons using standard vitrectomy settings (same aspiration and infusion rate) using visible light provided by the non–filtered microscope illumination served as the control. For both the IIT and standard vitrectomy procedures, no intraocular illumination was used. Main outcome measures included: ability to perform vitrectomy without visible light; time required to aspirate 50 cc of vitreous/infusion fluid; surgeons' impression regarding stereoscopy and visibility; ability to avoid retinal or lens contact; and occurrence of complications. Results–: Pars plana vitrectomy using the night vision image intensification technology was performed by all 3 surgeons without need of visible light. Average vitrectomy time to aspirate 50 cc of vitreous/infusion was 5.11 minutes and 4.15 minutes for the ITT and control procedures respectively. All three surgeons felt that sufficient visibility and stereoscopy was obtained for the proposed procedure using the ITT. No intraoperative or immediate postoperative complications were observed. Conclusions: Vitrectomy surgery without visible light using the night vision image intensification technology (IIT) is feasible and may become an adjunct for improving visualization in low light conditions.
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