This lens is mounted in a frame having two earpieces and composed of two spherical surfaces and an optical center. In the vertical orientation liquid crystal display, a plurality of regions having different inclination orientations of liquid crystal molecule are formed by applying a voltage to each pixel electrode having an aperture or a recessed portion. A beneficial agent is loaded into the opening within the strut in layers to achieve desired temporal release kinetics of the agent. It relates a monolithic process. In the calculation circuit, pixel data of the subject pixel of the HD signal is calculated using an estimating equation based on the tap data xi corresponding to the subject pixel of the HD signal selectively fetched from the SD signal in the tap selection circuit and the coefficient data wi read in class code CL from the coefficient memory. The head holding device comprises a splint connected to the middle board member immovably, two sliding grooves are provided on the splint, and two head holding clips and a mandible tray connected to the sliding pieces mounted in the two sliding grooves respectively, which can slide along the sliding grooves.