A viewing lens that is divided into at least three sections such that a wearer can see through a center section with both eyes, and can see through a lateral section only with the eye immediately adjacent to that section. The vibration detector detects vibration relative to a moving direction of an exposure head of the printer. In some aspects, the oligomers or liposome formulations of oligomers are administered in combination with one or more other therapeutic agents. A locking slid over one of the axle spring’s end enters into the cut formed on the tool’s slider and holds the tool in working position. Vapor derived from a liquid calibration standard in this manner can be employed as an accurate gas-phase calibration reference.