A pair of glasses includes a front frame, at least one lens, two temples, and two elongated couplers. The front frame is formed with two connection blocks at its two opposite ends. The front side of each connection block defines a cut. The rear side of each connection block is provided with two spaced lugs. The lens defines a cut corresponding to the cut of one connection block of the front frame. The front end of each temple is provided with a pivot pin that can be detachably fitted in the through-holes of the lugs of the connection block and the rear end of the elongated coupler, so that each temple is foldable relative to the front frame. The front end of each elongated coupler is provided with a hooked portion that can be detachably fitted into the cuts of the lens and connection block to install the lens.