Abstract: An ophthalmic lens (112?, 200) for use in preventing or slowing the development or progression of myopia comprises an optic zone (202) for focusing light from distant point objects to a focal surface. The optic zone comprises a diffractive lens (206) for manipulating the longitudinal chromatic aberration properties of the light proximate the focal surface.

Abstract: A contact lens (201) includes an optic zone (202) that is centred on an optical axis (219), and a peripheral zone (204) surrounds the optic zone (202). A cross-sectional slice through the optic zone (202) along a meridian comprises a series of successive arcs (203a-203h) having a radial curvature power profile. The radial curvature power profile increases monotonically with radial distance from the optical axis (219). Light rays from a distant point source passing through the midpoint of each arc converge toward a point (215) on the first optical axis (203a-203h). For each arc (203a-203h), light rays from a distant point source pass through that arc (203a-203h) and converge towards a point (216) that is spaced away from the optical axis by a first distance. Methods of designing and manufacturing such contact lenses (201) are also described.

Abstract: A contact lens (201) and methods of manufacturing such a lens are described. The lens (201) includes an optic zone (202). The optic zone (202) comprises a central region (205), the central region (205) having a first optical axis (219), a base radial curvature power, a base radial sagittal power, and a centre of curvature that is on the first optical axis (219). The optic zone (202) comprises an annular region (203), wherein at a point halfway across the width of the annular region (203) the annular region (203) has a radial curvature power of X, wherein X is greater than the base radial curvature power. The annular region (203) has an off-axis centre of curvature that is a first distance from the optical axis (219) such that, at a point halfway across its width, the annular region (203) has a sagittal power of Y, wherein Y is greater than the base radial sagittal power, and wherein Y is less than X.

Abstract: An ophthalmic lens for use in preventing or slowing the development or progression of myopia. The lens has a first optical axis. A first surface of the lens is shaped to form a first surface power map. A second surface of the lens is shaped to form a second surface power map. The first and second surface power maps together form a lens power map. One of the first surface power map, the second surface power map, and the lens power map comprises: a base region and a myopia control region. The base region has a base power which focusses light to a focal point that is on the first optical axis. The myopia control region comprises a spiral shape and focusses light to a plurality of focal points that are offset from the first optical axis. Also a method of manufacturing such an ophthalmic lens.

Abstract: A contact lens for use in preventing or slowing the development or progression of myopia, and methods of manufacturing and using such a lens. The lens includes an optic zone and a peripheral zone that has a variation in thickness configured to control rotation of the lens. The optic zone comprises a central region having a base power that focuses light from distant point objects to a distal focal surface, said light forming a blur circle as it passes through a proximal focal surface. An annular region surrounding the central region, includes an add power region spanning less than 75% of the annular region, and having an add power of 0.5 D or more. Points defining centres of curvature of the add power region form a segment of an annulus. The add power region focuses light from distant point objects to form a focused arc at a proximal focal surface.