Spectacles comprising a front frame designed to support at least one lens, and a pair of arms, wherein each arm: - extends between a first end attached to the front frame and a second, longitudinally opposed end, - comprises a first portion associated with the first end and extending along a first axis, and - comprises a second portion, associated with the second end, which extends along a second axis coplanar with the first axis, abuts the first portion at a first bearing plane which is not perpendicular to the first and second axes, and is selectively rotatable relative to the first portion about an adjustment axis perpendicular to the first bearing plane to vary the inclination between the first and the second axis, wherein: - the first portion comprises a first element attached to the front frame and a second element abutting the first element, on the side opposite the front frame, at a second bearing plane perpendicular to the first axis, the second element being selectively rotatable relative to the first element about the first axis so as to rotate the position of the plane formed by the first and second axes, and - the second portion comprises a third element abutting the first portion and a fourth element which abuts the third element, on the side opposite the first portion, at a third bearing plane perpendicular to the second axis, and which is selectively rotatable relative to the third element about the second axis, characterized in that at least one of the second portion, the second element and the fourth element is movable relative to the first portion or, respectively, relative to the first element or relative to the third element, between an engaged position in which the first and second portion (20, 30), or, respectively, the first and second element (21, 22) or the third and fourth element (31, 32) are mutually fixed with respect to rotation, and an adjustment position in which the first and second portion (20, 30) or, respectively, the first and second element (21, 22) or the third and fourth element (31, 32) are rotatable, respectively, about the adjustment axis, the first axis or the second axis, and in that the first and second portion (20, 30) or, respectively, the first and second element (21, 22), or the third and fourth element (31, 32) are abutted at respective bearing surfaces on which respective front toothed rings are formed, these rings being mutually engageable when the first and second portion (20, 30) or, respectively, the first and second element (21, 22) or the third and fourth element (31, 32) are moved to the engaged position. - extends between a first end attached to the front frame and a second, longitudinally opposed end, - comprises a first portion associated with the first end and extending along a first axis, and - comprises a second portion, associated with the second end, which extends along a second axis coplanar with the first axis, abuts the first portion at a first bearing plane which is not perpendicular to the first and second axes, and is selectively rotatable relative to the first portion about an adjustment axis perpendicular to the first bearing plane to vary the inclination between the first and the second axis, - the first portion comprises a first element attached to the front frame and a second element abutting the first element, on the side opposite the front frame, at a second bearing plane perpendicular to the first axis, the second element being selectively rotatable relative to the first element about the first axis so as to rotate the position of the plane formed by the first and second axes, and - the second portion comprises a third element abutting the first portion and a fourth element which abuts the third element, on the side opposite the first portion, at a third bearing plane perpendicular to the second axis, and which is selectively rotatable relative to the third element about the second axis,