Schematic view of a Zeiss fundus camera. The incandescent lamp (for observation) and the flash lamp (for photography) are superimposed by means of a beam splitter so that light from the flash travels along exactly the same path as the observation light. The lamp filaments are imaged in the vicinity of the holed mirror, which deflects light toward the eye. The holed mirror is similar to the mirror in many retinoscopes, having a central hole to allow observation. Unlike a retinoscope's mirror, however, the holed mirror in a fundus camera is imaged into the plane of the patient's pupil by the objective lens. The objective lens corresponds to the condensing lens in an indirect ophthalmoscope and, like the condensing lens, it is designed with aspheric surfaces to provide the best possible image quality over a wide field of view.