Abstract: A photochromic optical article comprises a substrate, and a photochromic coating coated on an outer surface of the substrate and having at least two photochromic layers. Each of the photochromic layers has a composition that contains a carrier and at least one photochromic dye. The compositions of the photochromic layers are different from each other.

Abstract: A photochromic optical article comprises a substrate, and a photochromic coating coated on an outer surface of the substrate and having at least two photochromic layers. Each of the photochromic layers has a composition that contains a carrier and at least one photochromic dye. The compositions of the photochromic layers are different from each other.

Abstract: A combination device for attaching auxiliary spectacles to main spectacles has a base, a clip and a resilient member. The base is adapted to be mounted on the nose bridge of the auxiliary spectacles and has a recess with an opening. The clip is pivotally attached to the base to close of the opening of the recess. The clip has a length longer than that of the base to make the distal end extend away from the base and an inclined surface formed on the distal end. The resilient member is mounted between the base and the clip to provide a restitution force to the clip. Accordingly, a user can operate, without using hands, the combination device to attach or detach the auxiliary spectacles onto or from the main spectacles, and the use of the auxiliary spectacles is convenient.