An optical lens includes a lens portion having an optical axis, and an exterior portion connected to an outer periphery of the lens portion. In one aspect, an operating system includes an application programming interface, a display driver interface, and a display driver. In accordance with an exemplary embodiment of the invention the satellite communication link can be switched to an off-state when it is not needed for transferring calls or other information. % or less, at viscosity of 2 poise or less. A computation circuit may compute the internal DC resistance of the switching inductor based in part on the duty cycle measured by the duty cycle circuit and the current measured by the current sense circuit. Said other end has sections, which can be torn off and are separated from each other by perforations, to be attached to an injection device or the like.