Decentered protective eyewear

A high base lens to be mounted in dual lens, protective, noncorrective eyewear, with the lens mounted in a frame and held in front of the eye with the lens in a tilted orientation with respect to the eye and a line of sight, the lens comprising:

• a substantially spherical anterior surface that substantially conforms to a first sphere having a first center, and a substantially spherical posterior surface that substantially conforms to a second sphere having a second center, wherein a radius of the first sphere is greater than a radius of the second sphere, so that a lens thickness tapers away from an optical center of the lens, and an optical axis extends through the first and second centers of the spheres and the optical center of the lens, wherein the lens has a low minus power, and the optical axis is rotated away from parallel with the line of sight, in a direction or directions generally opposite an angle of incline with which the lens is to be mounted in a frame.

A noncorrective, protective, lens mounted in dual lens eyewear with lateral wrap and pantoscopic tilt, wherein:

• the lens is a low power minus lens having −0.02 to −0.12 diopters power, a center thickness of 1.0-3.0 mm, a base curvature of 6-9, lateral wrap of 5-30°, and pantoscopic tilt of 3-20°, and a substantially spherical anterior surface that substantially conforms to a surface of a first sphere having a first center, and a substantially spherical posterior surface that substantially conforms to a surface of a second sphere having a second center, wherein a radius of the first sphere is greater than a radius of the second sphere, so that a lens thickness tapers away from an optical center of the lens, and an optical axis extends through the first and second centers of the spheres and the optical center of the lens, and the optical axis is horizontally and vertically displaced away from a parallel to the normal line of sight, and the optical axis is angularly rotated nasally and superiorly away from the parallel with the line of sight, to a sufficient extent to substantially offset prismatic distortion induced by the tilted orientation of the lens, as compared to the same lens in which the optical axis is spaced from and parallel to the normal line of sight.

A method of manufacturing a non-corrective lens that is to be mounted in a tilted orientation in a frame, wherein the lens is a low power lens of a selected center thickness and base curvature, and the lens is cut from a lens blank at a position such that an optical axis of the lens is to be horizontally and vertically displaced from a line of sight, and angularly deviated to the line of sight at an angle sufficient to offset at least some of the prismatic distortion introduced into the lens by the tilted orientation.

A method of cutting a lens from a lens blank having a central equatorial line defined by an optical center offset from a lens blank geometric center, the method comprising orienting the A line of the lens at an angle with respect to a central equatorial line.

A method of manufacturing a right lens for dual lens optically corrected eyewear exhibiting wrap and pantoscopic tilt, the method comprising:

• providing a lens blank, the lens blank having a thickness which is vertically tapered symmetrically on either side of a central equatorial line and horizontally tapered from a relatively greater thickness at an optical center located between the geometric center of the blank at a medial edge of the blank to a relatively lesser thickness at a lateral edge of the blank, the equatorial line dividing the lens blank into an upper half and a lower half;
• and
• cutting the lens from the lens blank such that the lens is rotated with respect to the optical center, without substantially changing the geometric and optical characteristics of the lens.