Fused bifocal contact lens

A bifocal contact lens unit having a principal, distant vision body portion made from a material having a first index of refraction, and a bifocal segment fused in place at least partially within said lens body and formed from a material having a second index of refraction higher than said first index, said lens unit having a given optical center, said bifocal segment lying entirely below said center and having upper and lower bifocal segment surfaces, said lower surface extending through a circular arc of not more than 170.degree., but greater than 90.degree., said arc having its center at said optical center and lying generally parallel to the outer edge of the lens body, and terminating at a pair of outer end portions, said upper segment surface being a three-portion segment surface having a first surface portion extending through said circular arc of not more than 170.degree., but greater than 90.degree. being disposed generally centrally of said lens, having a radius of about 1.0 to about 1.2 millimeters, and terminating at a pair of inner end portions, said second and third surface portions extending outwardly, respectively, from said inner end portions and joining said respective outer end portions of said lower surface, said inner end portions being spaced downwardly from said lens center, said bifocal segment being constructed and arranged so that when said lens is oriented in its intended position for use, the line of sight of a user may move horizontally from left to right without passing through said bifocal segment, and whereby said line of sight falls entirely within said bifocal segment during horizontal eye movements when said lens is displaced upwardly.