A lens includes a lens body, and an electro-active section (liquid crystals and a diffraction section) that is provided to a region of part of the lens body. The lens includes a pair of electrodes that are embedded in the lens body, that are electrically connected to a focal length modification section, that extend downward from an upper side end of the lens body, and that are disposed substantially parallel to each other spaced apart in a width direction orthogonal to an up-down direction of the lens body. Lower ends of the pair of electrodes are disposed spaced apart from the electro-active section in the up-down direction of the lens body.

A computer-implemented method for providing a lens shape for an ophthalmic lens is disclosed. Further, there is provided a method for angular smoothing of a surface determined by carrier lines radially outwards of a prescription zone bordered by a first boundary line. In addition, there is provided an ophthalmic lens, in particular, a spectacle lens. Moreover, a method for minimizing the difference in thickness between two ophthalmic lenses for the same spectacles is provided. A computer program product and a machine-readable storage medium are provided as well.

A helmet assembly includes a face shield and a single, center top mounting arrangement that operatively connects a center top location of the face shield to a center front mount on the helmet. The face shield can be raised and lowered about a pivot axis provided in the mounting arrangement between a tilted up, non-use position and a lowered, deployed position. The mounting arrangement can include a detent and two recesses, wherein the detent engages a first recess at a slightly forwardly displaced position to allow ventilation between the helmet and mandible and the face shield and a second recess at the tilted up, non-use position. The recess and detent engagement can be overcome by easy manual force acting on the face shield to reposition the face shield.

An off-axis curvature center lens is characterized by an x-y-z coordinate system of the convergence-reducing lens, the off-axis curvature lens comprising a distance-vision region with a non-negative distance-vision optical power, having a front distance-vision surface with a center of front distance-vision curvature, and a rear distance-vision surface with a center of rear distance-vision curvature; and a near-vision region with an optical power within 0.5D of the distance-vision optical power, having a front near-vision surface with a center of front near-vision curvature, and a rear near-vision surface with a center of rear near-vision curvature; wherein at least one of an x-coordinate of the center of front near-vision curvature is nasal relative to an x-coordinate of the center of front distance-vision curvature, and an x-coordinate of the center of rear near-vision curvature is temporal relative to an x-coordinate of the center of rear distance-vision curvature.

Aspects of the disclosure provide for a method of designing a lens. Examples of the method include determining a central optic zone of the lens, determining a transition zone of the lens disposed about the central optic zone, determining a landing zone of the lens disposed about the transition zone, and determining an edge lift zone of the lens disposed about the landing zone. Examples of the landing zone of the lens comprise a temporal radius, a nasal radius, a vertical radius, and an inferior radius each with respect to a common point, where at least one of the temporal radius, the nasal radius, the vertical radius, or the inferior radius is not equidistant from the common point with respect to a remainder of the from the common point with respect the a remainder of the temporal radius, the nasal radius, the vertical radius, and the inferior radius.

Aspects of the disclosure provide for a method of creating a lens. Examples of the method include identifying a limbal zone of the eye, determining a back optic zone within the limbal zone, determining a front optic zone based at least partially on the limbal zone, computing a lens surface of the lens based at least partially on the limbal zone, the back optic zone, and the front optic zone, de-centering at least one of the back optic zone or the front optic zone from a visual axis or a spindle axis of the lens.

Embodiments concern an optical eye-contact device comprising a lens body having a symmetry axis and which further comprises a light-transmissive portion and an opaque portion, wherein the light-transmissive portion is decentered with respect to the symmetry axis.

A helmet assembly includes a face shield and a single, center top mounting arrangement that operatively connects a center top location of the face shield to a center front mount on the helmet. The face shield can be raised and lowered about a pivot axis provided in the mounting arrangement between a tilted up, non-use position and a lowered, deployed position. The mounting arrangement can include a detent and two recesses, wherein the detent engages a first recess at a slightly forwardly displaced position to allow ventilation between the helmet and mandible and the face shield and a second recess at the tilted up, non-use position. The recess and detent engagement can be overcome by easy manual force acting on the face shield to reposition the face shield.

An optical lens for use with an eyewear frame includes an inner surface and an outer surface, with the lens being configured to be positionable adjacent a wearer's eye to enable viewing through both the inner and outer surfaces of the lens. The optical lens additionally includes a plurality of magnification regions, with each magnification region extending between the inner surface and the outer surface and being associated with a respective minimum magnification magnitude and a respective peripheral boundary. The peripheral boundaries for the plurality of magnification regions are disposed about a common center of magnification. The lens includes a geometric center residing on at least one of a longitudinal midline of the lens or a latitudinal midline of the lens, with the center of magnification being offset from the geometric center.

A computer-implemented method for providing a lens shape for an ophthalmic lens is disclosed. Further, there is provided a method for angular smoothing of a surface determined by carrier lines radially outwards of a prescription zone bordered by a first boundary line. In addition, there is provided an ophthalmic lens, in particular, a spectacle lens. Moreover, a method for minimizing the difference in thickness between two ophthalmic lenses for the same spectacles is provided. A computer program product and a machine-readable storage medium are provided as well.