A mold assembly for manufacturing ophthalmic lenses comprising: a front mold half defining a central concave curved section, a peripheral flat section and a recess positioned between the central concave section and the peripheral flat section; a back mold half defining a central convex curved section, a peripheral flat section and a flash gathering section positioned between the central convex section and the peripheral flat section, wherein the flash gathering section comprises a number of protrusions; and an anti-tilt feature cooperatively associated with one of the front mold half and the back mold half, the anti-tilt feature being configured to ensure that the front mold half and the back mold half come into contact at contact edge points (320, 322), thereby creating the contact lens edge, and to prevent tilting of the back mold half relative to the front mold half; wherein the anti-tilt feature is a protrusion symmetrically positioned around the mold half and having a substantially triangular cross-section defined by an outward-facing flank and an inward-facing flank that meet at an apex such that the protrusion extends towards, and its apex but neither of its outward-facing and inward-facing flanks contacts, the peripheral flat section of the other of the front mold half and the back mold half when the two mold halves are mated with no tilting of the back mold half relative to the front mold half; wherein the recess comprises a notch in the front mold half with one end being the respective contact lens edge point and the anti-tilt feature is configured to prevent flash from travelling onto the peripheral flat sections (308, 316) from the flash gathering section and the recess. a front mold half defining a central concave curved section, a peripheral flat section and a recess positioned between the central concave section and the peripheral flat section; a back mold half defining a central convex curved section, a peripheral flat section and a flash gathering section positioned between the central convex section and the peripheral flat section, wherein the flash gathering section comprises a number of protrusions; and an anti-tilt feature cooperatively associated with one of the front mold half and the back mold half, the anti-tilt feature being configured to ensure that the front mold half and the back mold half come into contact at contact edge points (320, 322), thereby creating the contact lens edge, and to prevent tilting of the back mold half relative to the front mold half; wherein the anti-tilt feature is a protrusion symmetrically positioned around the mold half and having a substantially triangular cross-section defined by an outward-facing flank and an inward-facing flank that meet at an apex such that the protrusion extends towards, and its apex but neither of its outward-facing and inward-facing flanks contacts, the peripheral flat section of the other of the front mold half and the back mold half when the two mold halves are mated with no tilting of the back mold half relative to the front mold half; wherein the recess comprises a notch in the front mold half with one end being the respective contact lens edge point and the anti-tilt feature is configured to prevent flash from travelling onto the peripheral flat sections (308, 316) from the flash gathering section and the recess.