Patent ID: 6773107
Filing Date: 2004-08-10
Classification: G02C

Abstract:
A contact lens having top, a bottom, a rotational axis, an inner surface and an opposite outer surface, the outer surface including a plurality of zones, comprising:a. an optical zone having a lower edge, including: i. a distance vision zone having a first radius of curvature that provides distance vision correction and having a first area that is sufficient to overlay a substantial portion of a pupil of a user and disposed in a first position within the optical zone so that the user's pupil is substantially subtended by the distance vision zone when the user is gazing at a substantially horizontal point; and ii. a near vision zone, extending radially outward from the distance vision zone, having a second radius of curvature that provides near vision correction and having a second area that is sufficient to overlay a substantial portion of a pupil of a user and disposed in a second position within the optical zone so that the user's pupil is substantially subtended by the near vision zone when the user is gazing at a near vision point below the substantially horizontal point; b. a ridge zone, having an upper edge and a lower edge and disposed below the optical zone, that includes a latitudinal ridge portion extending outwardly from the outer surface to enable engagement with a lower eyelid of a user and thereby provide vertical translation support for the contact lens when being worn by the user; c. a transition zone extending from the lower edge of the optical zone to the upper edge of the ridge zone that provides a smooth transition from the ridge zone to the optical zone; and d. a bevel zone, extending radially outward from a ridge-off zone and the lower edge of the ridge zone, that tapers to a narrow end.