An optical stack includes a reflective polarizer disposed on, and substantially conforming to, a major surface of an optical lens. The reflective polarizer substantially reflects light having a first polarization state and substantially transmits light having an orthogonal second polarization state. The optical lens has an optical retardance of greater than 10 nm at a first location in a largest optically active region of the optical lens. A same principal axis of the optical retardance is aligned with a same one of the first and second polarization states to within about 10 degrees at the first location.