A method for storing additional data relating to menu data, particularly to thumbnail pictures, on optical media, e. The timing device consists of a main body and a timing initiator. The apparatus comprises; liquid crystal panels 12R, 12G, and 12B; light emitting units 13R, 13G, and 13B, positioned at the back of the liquid crystal panels and provided with organic EL elements as light emitting layers; and cooling bodies 14R, 14G, and 14B, positioned at the back of the light emitting units, for dispersing the heat generated by the light emitting layers. This enables viewers to grasp efficiently and panoramically the contents of a large number of images which are displayed in a display area of a limited size. A third sleeve is in operable communication with the first sleeve, and a release member is in operable communication with the third sleeve and is configured to move the third sleeve after it is released. In some embodiments, the apparatus can include a surgical microscope andor a wavefront aberrometer.