Tokai Optical’s new designing engine, “DIGITECH-CORE 5” has realized sway-free distortion-free sight with the strong reduction of the aberration. The user is provided with natural “adaptation to wear” and “better ease of use” having not been experienced. In addition, Active Mode is provided to meet demands for various lifestyles. The seamless sight which can be achieved and the variation of selection can realize a free and active lifestyle.