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S.K. Gupta, G.Y. Shah, V.A. Shah, K.V. Chalam; Evaluation of Light Weight Autoclavable Self–Stabilizing Wide–Angle Contact Lens for Vitreous Surgery . Invest. Ophthalmol. Vis. Sci. 2005;46(13):690.
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© ARVO (1962-2015); The Authors (2016-present)
To evaluate an autoclavable self–stabilizing light weight wide–angle contact lens for vitreoretinal surgery
The light weight wide angle contact lens has two pieces in a high temperature resistant 302oF (150oC) plastic casing. This modification of the lens over the previously described conventional autoclavable lens is the casing. The casing has a window in the middle of the two lens parts. The inferior part has an acrylic concavo–convex lens with footplates (refractive index [RI] 1.51). The superior biconvex lens is made of glass (RI 1.883). The convex superior surface has a ROC of 6.95 mm
The refractive power of the lens is 150D, magnification 0.39X, and static field of view (total area of retina in a single field)106o, while the dynamic field (total area of the fundus that can be viewed by moving the lens on the cornea) is 127o. The plastic casing wiht a window reduces weight, allowing better lens stability on the eye during vitreous surgery. The open lens design prevents the lens from fogging during autoclaving and vitreous surgery on the eye. The lens is easy to sterilize by autoclaving and does not require the expensive gas sterilization or potentially injurious chemical sterilization.
The autoclavable self–stabilizing light weight wide–angle contact lens allows visualization of the peripheral retina during surgery and faster sterilization by autoclaving between surgeries without the disadvantage of lens fogging.
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