Abstract: A light projector device for projecting eyesight examination tests onto a screen comprises a test disc and a mask disc mounted one in front of the other with their peripheral regions in the path of a light beam from a light projection unit. The discs are rotatable by independent motors and the test disc has on its periphery a series of translucent areas carrying tests while the mask disc has a series of light passages capable of being superimposed on the test areas of the test disc in the light beam. A test carrier dial is adapted for rotation in the light beam about an axis co-axial with the optical axis of the projection unit, and this test carrier dial and the test disc are both mounted on a plate which is adapted to rock between two end positions.