The body includes the main objective lens system of the surgical microscope and carries an optical magnification system. The laser apparatus includes a spectral beam combiner configured to combine the corresponding pump laser beams into a substantially spatially-coherent pump laser beam having a pump spectrum that includes the unique peak wavelengths, and first and second selectively reflective elements spaced from each other to define a lasing cavity including a lasing medium therein. The polyethylene blend also has a narrow molecular weight distribution of less than 3 and a density of from 0. The swellable elements can be unitized with one another through each aperture. The image display method comprises the steps of extracting attribute values indicating attributes for specifying the image information from the description data, listing the extracted attribute values, selecting at least one attribute value from among the listed attribute values, reading the image information specified by the selected attribute value, and displaying the image information.