Patent ID: 7080906

Claim:
A pair of multifocal contact lenses, a first translating contact lens and a second translating contact lens, wherein each of the first and second lenses comprises an anterior surface and an opposite posterior surface, wherein the anterior surface of each lens includes a vertical meridian and horizontal meridian, and a central optical zone, wherein the central optical zone of each lens has a superior optical zone, an inferior optical zone, and an optical blending zone, wherein the optical blending zone has a surface that ensures a smooth surface transition from the superior optical zone to the inferior optical zone and that allows the superior and inferior optical zones independently of each other to be designed and optimized so that ghost images or blur from the superior and inferior optical zones is minimized or eliminated, wherein the superior optical zone of the first lens is for distance vision correction and the inferior zone of the first lens is for intermediate or near vision correction, wherein the superior optical zone of the second lens is for distance or intermediate vision correction and the inferior zone of the second lens is for intermediate or near vision correction, wherein the apex of the superior optical zone coincides with the center of the central optical zone, wherein the vertex center of the inferior optical zone is located at the intersection point of the vertical meridian or a line which is parallel to the vertical meridian and passes through the center of the central optical zone with its boundary line with the optical blending zone, wherein the width of the optical blending zone is about 0.1 mm or less at the center, and wherein a first line passing through the vertex center of the inferior optical zone and the center of curvature at the vertex center of the inferior optical zone intersects a second line passing through the apex of the superior optical zone and the center of curvature at the apex of the posterior surface, wherein the intersection point of the first line with the second line is within 2 mm or less of the center of curvature at the apex of the base optical surface.