Abstract: In a contact lens (1) provided with a front curve (2) formed with a plurality of distance portion curved surfaces (F.sub.1, F.sub.2, . . . ) for seeing a distant place . . . )and a plurality of near portion curved surfaces (N.sub.1, N.sub.2, for seeing a near place arranged alternately and repeatedly in concentric zone shape, the distance portion curved surfaces formed at least a central zone of the front curve have respective curvature centers (O.sub.F1, O.sub.F2, . . .

Abstract: An electronic watch which normally displays home time and calendar data, on demand displays additional data and correct time and calendar data for every global time zone in response to actuation of external members. An alarm function is set by actuation of external members in either the home or global mode. When the alarm is set in the home mode, the alarm sounds at the same display-indicated time regardless of the time zone of operation. When the alarm is set in the global mode, the alarm sounds at the selected hour in a particular time zone regardless of the time in the actual zone of operation. The display returns to the home time display mode if the external members are continuously actuated for a time in excess of a predetermined period. Data derived from a signal generator and divider network is inputted to counters accumulating timekeeping and calendar data. An alarm-setting counter holds alarm data selected by the user.

Abstract: An electronic wristwatch including an auxiliary power supply for energizing at least the timekeeping circuit when the main power supply is being removed for replacement is provided. The wristwatch includes a high frequency time standard that vibrates at a high frequency and a timekeeping circuit coupled to the high frequency time standard for converting the high frequency vibrations of the time standard into low frequency timekeeping signals representative of actual time. A display is coupled to the timekeeping circuit for displaying actual time in response to the low frequency timekeeping signals applied thereto. The main power supply is coupled to the timekeeping circuit and to the display for delivering a voltage of a sufficient magnitude to operate the timekeeping circuit and display.