| 摘要 |
A pair of spectacles 1 has a frame 2 and a pair of combined lenses 8a-b carried by the frame. Each combined lens has an adjustable focal length and may be adjusted by movable actuators 10a-b and has two lens elements 14, 16 arranged one behind the other along an optical axis 12a-b of the combined lens. An adjustment mechanism is arranged to move the two lens elements laterally relative to one another to vary the focal length whereby each lens element is movable in a direction opposite to the other lens element and transverse to the optical axis. In this manner the optical axis remains substantially fixed relative to the frame. The adjustment mechanism comprises at least one frame-connected rotatable element, such as lugs (44, 46, Figure 6) engaging at least one lens element and, when in use, urges a lateral movement of the lens element. |
