A new biconcave contact lens for vitrectomy in eyes with intraocular lens implantation

The authors report a new biconcave contact lens capable of providing superior surgical views of eyes during vitrectomy and intraocular lens implantation under both fluid-filled and air-filled conditions. The new biconcave lens is made of a glass with a high refractive index (nd = 1.883). The lens is placed on the cornea using a regular lens ring for the floating vitrectomy lens system. During vitrectomy, the new biconcave lens provides a view as clear as that of the commercially available flat-concave lens when the vitreous cavity is filled with fluid. The lens also provides a more magnified view than the commercially sold biconcave lens during fluid-air exchange, with no need for replacement. The new biconcave vitrectomy lens spares the surgeon the trouble of replacing different refractive lenses during the fluid-air exchange procedure in an eye undergoing intraocular lens implantation, and may be helpful for vitreous surgery.