| 摘要 |
Various forms of contact lenses can be produced having improved properties. The surface of the lens to be polished is brought into contact with a polishing compound associated with a flexible (but non-resilient) sheet, causing the sheet to flex. Fluid pressure is applied to the sheet counteracting the flexing as a result of lens contact, so that polishing compound associated with the sheet makes contact with the lens surface with uniform force distribution. Relative rotation between the lens and sheet is effected so that all portions of the lens surface in contact with the polishing compound are polished to the same extent. The lens may then be ground to provide a multifocal lens. A multifocal hydrophilic or silicone contact lens having desired distance and intermediate powers may be constructed by acting on the lens so that it is capable of accepting grinding activity, and then effecting distortion-free grinding thereof. Usually a single vision hydrophilic or silicone lens is fitted in a wearer's eye, and then is removed and ground to provide a multifocal contact lens suitable for use by the wearer. |
