one or more light sources operable to emit a plurality of light beams;

a phase modulator comprising a two-dimensional array of pixels, the pixels controllable to retard phase of light incident on the pixels by variable amounts, the phase modulator having an active area in an optical path of the plurality of light beams, each of the plurality of light beams incident on the active area of the phase modulator in a corresponding one of a plurality of distinct regions of the active area of the phase modulator;

a controller configured to set the pixels of each of the distinct regions of the phase modulator to display an optical form for a patch lens corresponding to the distinct region, the patch lens is configured to correct for non-uniformities in at least one of: