Abstract: A method of fabricating a lens element for an adjustable power lens of the kind comprising two lens elements that are slidable relative to one other in a direction transverse the optical axis of the lens and have respective lens surfaces that are shaped to act together to form a corrective lens, the power of which varies according to the relative disposition of the two lens elements, the method comprising the steps of forming a lens puck having two opposite faces, which are shaped to form opposite lens surfaces of one of the lens elements of the adjustable power lens, the puck having at least one alignment feature, and thereafter edging the puck to a desired eye shape with reference to the alignment feature.

Abstract: To achieve this an air routing valve is used to alter the stream of exhaust air coming from the outlet of the motorized fan housing away from the cleaning head of the Air Recycling Cleaner back into the ambient air to create a vacuum cleaner. Both systems the Air Recycling Cleaner and the Vacuum Cleaner have their own place in floor care. However as it is not convenient or practical to have two cleaners available in the home at all times the dual mode system allows one upright cleaner to do both jobs and allows the operator to have the advantage of both types of cleaning system available in one machine simply by the operation of an air routing valve control.