In a pair of glasses, in particular industrial safety glasses, comprising a frame with side pieces which are articulated thereto by a side-piece projection; and two eyeholes with encircling grooves and sight pieces inserted in the grooves; the frame being divided in the vicinity of the eyeholes for expansion and exchange of the sight pieces and lockable in the closed position; and the frame being divided in the vicinity of the side-piece projection; it is provided that the side-piece projection, in prolongation of the divided area of the frame, is divided into a top projection of the top frame member and a bottom projection; and that a pivoted locking device is pivotably mounted on the top projection of the frame member and lockable in place by the bottom projection.