Patent ID: 8192020

Claim:
A tilted-wear type contact lens, comprising: an optical zone situated in a lens center section, and provided with a first diopter power region and a second diopter power region having a lens diopter power that is more positive than that of the first diopter power region, wherein the contact lens has a lens profile that is axisymmetric with respect to a symmetrical meridian defined by one diametrical line 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 against a geometric center of the optical zone, wherein a circumferential positioning member is provided to afford stable positions in a lens circumferential direction when worn in an eye, wherein an orthogonal meridian that is orthogonal to the symmetrical meridian is tilted by a prescribed angle with respect a vertical line of the eye, wherein the circumferential positioning member is adapted to give rise to a first stable state in which, with the lens placed in a right eye, the orthogonal meridian is tilted by a first tilt angle in the circumferential direction relative to the vertical line of the eye, and to a second stable state in which, with the lens placed in a left eye with an orientation thereof flipped vertically from that when worn in the right eye, the orthogonal meridian is tilted relative to the vertical line of the eye by a second tilt angle to an opposite side in the circumferential direction from the first tilt angle, and wherein a visible indicator mark is provided for identifying normal position and flipped position in relation to the orientation in a lens vertical direction.