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M.C. Patel, S.K. Gupta, S. Vinjamaram, K.V. Chalam, V.A. Shah; Newly Designed Dual Purpose Autoclavable Lens for Vitreous Surgery . Invest. Ophthalmol. Vis. Sci. 2003;44(13):3055.
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Purpose: To develop an autoclavable dual purpose wide-angle contact lens for vitreous surgery. Methods: The wide-angle contact lens is made of autoclavable plastic material. It has two lens pieces within a plastic casing. The inferior lens is made of acrylic has a concave contact surface with a radius of curvature (ROC) of 7.7 mm. The superior glass lens has a convex superior surface of 6.95 mm ROC. The inferior lens is mounted on the case to make the wide-angle assembly (Figure). The benefit of this lens system is that the inferior concavo-convex lens can be individually used as a separate high magnifying lens for posterior pole surgery. While the lens assembly is used as the conventional wide-angle vitrectomy lens system. The lens is kept on the cornea upon a drop of viscoelastic substance. An assistant holds the lens with the conventional lens holder. Results: The new lens enables the surgeon to have a stable magnified view of the central retina and ability to address the peripheral retina as well. The field of view of the wide-angle lens is 106 degrees static and 127 degrees dynamic view. The lens is easy to sterilize by autoclaving and does not require the expensive gas sterilization or potential injurious chemical sterilization. Conclusions: To the best of our knowledge, this is one of the initial conventional wide-angle lenses that can be autoclaved for sterilization purposes. The other advantage of this lens system is that a single lens can be used as a concavo-convex high magnifying lens for precise posterior pole surgery and wide-angle lens for peripheral vitreous surgery. View OriginalDownload SlideView OriginalDownload Slide
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