An ophthalmic solution is provided. The calibration of the transmission or receiving power of the transmitter or receiver includes a summing step for summing transmission or reception signals of the antenna array, and a common calibrating step for commonly calibrating the summed signals. Data and control signals are interchanged with the separate external memory IC chip through the serial or parallel external-memory port using the RF port when the external electronic system is not available or through the external electronic system serial or parallel port when the external electronic system is available. The microphone arm has a length, which in the main is less than or of the same order as the greatest extent of the housing, so that in the folded-in state the microphone arm does not project out over the circumference of the housing. A resulting unique overall golf ball multiple color appearance is achieved by the positioning and aligning one layer about another.