Patent ID: 7976156

Claim:
A wearing-orientation selectable contact lens comprising: an optical zone situated in a lens center section; a first diopter power region provided in the optical zone; and a second diopter power region provided in the optical zone and having a lens power that is more positive than that of the first diopter power region, wherein the contact lens has a lens profile axisymmetric with respect to a symmetrical meridian defined by one of diametrical lines of the optical zone; wherein a superficial center of at least one of the first diopter power region and the second diopter power region is decentered on the symmetrical meridian from a geometric center of the optical zone; wherein a circumferential positioning member is provided so as to afford a stable position in a circumferential direction of the lens when worn in an eye where an orthogonal meridian that is orthogonal to the symmetrical meridian refers to a vertical direction of the eye; wherein the circumferential positioning member is adapted to selectively set up: a first stable state where the superficial center of the one of the first diopter power region and the second diopter power region, the one being decentered from the geometric center of the optical zone, is positioned to one of left and right side of the eye, and a second stable state where the superficial center of the one being decentered from the geometric center of the optical zone is positioned to another of left and right side of the eye; and wherein a visible indicator mark is provided for identifying a lens orientation of the first stable state and a lens orientation of the second stable state.