| 摘要 |
An improved ophthalmic lens and method of making same, said lens being formed of refractive material having two refractive surfaces one of which is divided into first and second viewing zones intended respectively for distant vision and near vision. The first viewing zone of the lens occupies substantially the upper half of said one surface and may be spherical or it may be an aspheric surface of revolution. The second zone of the lens occupies the lower portion of said one surface and is uniquely configured to markedly reduce blur and distortion. The method of the invention provides a novel and superior technique for smoothly connecting the surface between the distance and near viewing portions of the lens. The lens produced by the method is unique in that blur and distortion in the portion of the lens predominently used by the wearer is substantially eliminated. |
