Abstract: A pair of eyeglasses includes a lens, two engaging blocks each having an end engaged with a side of the lens, and two clamping members. A ring is mounted to the other end of each engaging block. An end of each clamping member is mounted to a cap visor. The other end of each clamping member includes an engaging hole. An annular toothed wall extends from a bottom wall defining the engaging hole. An annular groove is defined between an outer face of the annular toothed wall and an inner circumference defining the engaging hole. The rings are engaged in the engaging holes the clamping members, with teeth on the annular toothed wall engaged with teeth on the ring. The annular toothed wall expands into the annular groove when the teeth of the rings press against the teeth of the annular toothed wall during pivotal movement of the rings.