Contact lens ballasting

A contact lens comprising:

• a contact lens body having a convex anterior surface, a concave posterior surface, and a peripheral edge therebetween,
• the contact lens body having a thickness between the anterior surface and the posterior surface
• the contact lens body comprising:
• a peripheral zone adjacent the peripheral edge, the thickness of the body in the peripheral zone tapering towards the peripheral edge;
• an inner zone, circumscribed by the peripheral zone;
• and
• an optic zone circumscribed by the inner zone;
• and wherein
• in a first angular sector of the inner zone spanning at least 10 degrees, the thickness of the lens body increases monotonically along a first blink axis of the lens, and the lens body comprises a series of consecutive cross-sections, each cross-section extending along a first reference axis, each first reference axis extending transversely to the first blink axis, each cross-section having a substantially uniform thickness not varying by more than 15 μm or 10% of the minimum thickness along said first reference axis whichever is greater in absolute terms;
• and
• in a second, different, angular sector of the inner zone spanning at least 10 degrees, the thickness of the lens body increases monotonically along the length of a second, different, blink axis of the lens, and the lens body comprises a series of consecutive cross-sections, each cross-section extending along a second reference axis, each second reference axis extending transversely to the second blink axis, each cross-section having a substantially uniform thickness not varying by more than 15 μm or 10% of the minimum thickness along said reference axis whichever is greater in absolute terms.

A contact lens comprising:

• a contact lens body having a convex anterior surface, a concave posterior surface, and a peripheral edge therebetween;
• the contact lens body having a thickness between the anterior surface and the posterior surface;
• the contact lens body comprising:
• a peripheral zone adjacent the peripheral edge, the thickness of the body in the peripheral zone tapering towards the peripheral edge;
• an inner zone, circumscribed by the peripheral zone;
• and
• an optic zone circumscribed by the inner zone;
• and wherein in a 90 degree sector of the inner zone and for the majority of the minimum width of the inner zone:
• (i) the thickness of the lens body at any given radial position varies with angular position around the centre of the optic zone by at least 15 μm or 10% of the minimum thickness in the inner zone whichever is greater in absolute terms;
• (ii) the thickness of the lens body increases monotonically with distance from the peripheral edge inwardly along a first blink axis of the lens;
• (iii) the maximum thickness of the lens body at any given radial position lies within 5 degrees or 5% of the angle of the first blink axis to the vertical meridian whichever is lesser in absolute terms;
• and
• (iv) a reference axis extends transversely to the blink axis, and along said reference axis on each side of the blink axis for a distance ending at the blink axis and being equal to at least 5% of the minimum width of the inner zone, the thickness of the lens body monotonically increases with distance along the reference axis towards the blink axis by at least 15 μm or 10% of the minimum thickness along said reference axis whichever is greater in absolute terms.