In an image display apparatus, two light sources emit illumination light having different wavelengths, with which a liquid crystal display device is illuminated. By modulating the illumination light, the liquid crystal display device produces a first and a second image light having different wavelengths. Two holographic optical elements respectively reflect the first and second image lights and direct them to the user's eye so that virtual images of the images represented by the first and second image lights are formed at different positions. As the light source from which to obtain the illumination light is switched between the two, the dioptric power with which to present an image is changed.