Abstract: A hinge, particularly for rotatably coupling two parts of a pair of eyeglasses preferably made of plastics. The hinge is constituted by at least one first element, which merely allows the mutual positioning of the two components, and by at least one separate second element, which allows the mutual and temporary rotary coupling of the two parts.

Abstract: A device for interconnecting and pivoting two components of eyeglasses or protective elements for sports use. The device is constituted by a single flexible body that is detachably associable at at least one hole formed on one of the two components. The single body is provided with temporary engagement elements for the other one of the two components.

Abstract: A connecting device, particularly usable for eyeglasses, having two elements that are rotatably associable to each other and can be detachably connected to two separate components of the eyeglasses, at least one of the components being made of a material that cannot be welded to the device, such as aluminum. It is thus possible to produce aluminum or carbon fiber eyeglasses without welds.

Abstract: Multilayer lens particularly usable for sunglasses, having a main layer made of polycarbonate, cellulose acetate, or similar materials. A mirror reflecting layer is possibly coupled to the main layer or deposited thereon in vacuum by sublimation of appropriate substances, with the optional interposition of a layer of paint. The multilayer lens furthermore includes an outer layer that partially affects the outer surface of the lens. The lens may also include an inner antifogging layer that does not absorb moisture. This multilayer lens allows optimum vision to the user, eliminating or attenuating spurious incident rays at the lateral ends of the lens.

Abstract: The engagement device has a first seat having a longitudinal extension and formed in a first end of a lens of a pair of eyeglasses. A second seat, also formed in the first end of the lens, has an essentially circular configuration and communicates with the first seat. The engagement device also has a longitudinal bridge connected to a second end of a temple and a cylinder connected to the bridge. The bridge and the cylinder are interposed transversely between two wings formed at the second end of the temple. The bridge is accommodated in the first seat and the cylinder is accommodated in the second seat. The walls laterally delimiting the first seat may be manufactured at mutually different angles to each other according to the desired angle of the lens with respect to the temple.