Contact lens for non-rotational orientation

Details Contact lens for non-rotational orientation Contact lens for non-rotational orientation

G - Physics

02

C

88/40

G02C 7/04 (2006.01)

Patent

CA 1140374

CONTACT LENS FOR NON-ROTATIONAL ORIENTATION Abstract of the Disclosure A contact lens for the correction of astigmatism or presbyopia and for the correction of "high riding" lenses being of lenticular construction. This invention avoids unwanted in- crease in center thickness of the lens and unwanted prism in the central area. The curved lenticular carrier portion of the lens, the non-visual portion, is constructed with a concentric curve cut which produces a thick lens edge. The lenticular carrier is also provided with a second eccentric curve cut, with respect to the visual axis of the lens, to provide a thickness disparity between the superior and inferior portions of the lens and to provide an offset center of gravity and a desirable rotational positioning of the lens in the eye of a wearer, particularly when the lens is of astigmatic or bifocal type.

362304

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