Abstract: An optical device, to be used by a user driving a vehicle, the optical device including a controllable variable-tint lens and a controller, where the controller is configured to switch the optical device between at least two different modes, at least one mode being a driving mode and when the optical device is in the driving mode, a control parameter of the lens meets at least one driving criterion.

Abstract: An eyewear having a quick lens release structure includes a frame, a latching member, an elastic member, and a lens. The frame has a groove including a plurality of slots and a notch. The latching member is disposed in the groove and includes a lever disposed in the notch and a plurality of hooking portions disposed in the slots with portions protruding from slots. The lens is engaged to the frame and has a plurality of hooking portions. One end of the elastic member presses against the latching member, and the other end presses against the groove such that the hooking portions of the latching member and the lens can be coupled and decoupled.