Patent ID: 8251557

Claim:
Method for manufacturing a batch of headlight lenses for a vehicle headlight, wherein each headlight lens comprises a lens body made from transparent material and having an essentially planar, optically operative surface as well as a convexly curved, optically operative surface and an optical axis, wherein each lens in the batch has substantially a same convexly curved, optically operative surface, the method comprising providing first mould for moulding the convexly curved, optically operative surface, providing a second mould for moulding the essentially planar, optically operative surface, which second mould comprises a first mould section and an annular second mould section enclosing the first mould section, the first mould section being movable with respect to the annular second mould section, providing a pre-form having a volume, moulding the pre-form using the first mould and second mould to form the headlight lens with an integrally formed lens edge formed by an offset depending on the volume of the pre-form a step is pressed into the headlight lens of the second mould section with respect to the first mould section, and wherein the first mould section is set back with respect to the second mould section at least in a region of the offset such that a height of a step of headlight lens of the batch differs from the height of a step of at least one further headlight lens of the batch.