Patent ID: 8007105
Filing Date: 2011-08-30
Classification: A61B,A61F

Abstract:
1. A contact lens for vitreous surgery used to observe an ocular fundus during vitreous surgery consisting of: only one lens for intraocular observation comprising a lens main body having a lens lower surface provided with a curved surface that matches a curvature of a cornea, and a lens upper surface for observing a vitreous or an ocular fundus, and which is held on the cornea by the lens lower surface and is used for observing inside an eye from the lens upper surface, and an antireflective film that is coated on at least a portion of the lens upper surface or the lens lower surface via an ion beam sputtering method, is durable to high-pressure steam for sterilization, and is made of a multilayered film in which a layer that contains silicon dioxide and a layer that contains tantalum pentoxide are alternately layered, and the topmost layer of the antireflective film is the layer that contains silicon dioxide, wherein a reflective coating is formed on neither the lens upper surface nor the lens lower surface.