1. An imager module comprising: an imager die; an imager pixel array mounted on the imager die; and a first spacer lens comprising a lens portion and a spacer portion formed as a single unitary piece with a substantially flat upper surface, wherein the lens portion and the spacer portion create a fully enclosed first spacer lens cavity between the imager die and the lens portion; and wherein the spacer portion of the spacer lens is bonded to the imager die and an interior surface of said lens portion adjacent to the first spacer lens cavity has a curved surface such that the lens portion is optically aligned with the imager pixel array.