Abstract: Linearly adjustable sunglasses for allowing a wearer of a pair of eyeglasses to removably mount sunglasses lenses on the pair of eyeglasses. The inventive device includes a first-half frame member and a second-half frame member linearly adjustably coupled to the first-half frame member. A first lens and a second lens are secured to the first-half frame member and the second-half frame member, respectively. The first-half frame member and the second-half frame member are linearly adjustable between an expanded position and a contracted position. As such, the first lens and the second lens are positionable in use between the temple pieces of a pair of eyeglasses rearward the lenses of the pair of eyeglasses.