The present application relates to a pair of smart glasses. The smart glasses comprise a frame, an imaging optical module, an eye-tracking optical module and a waveguide assembly, wherein the frame comprises rims and a connecting part, a mounting cavity for the mounting of the imaging optical module and the eye-tracking optical module thereon being formed in the connecting part; and the waveguide assembly is embedded in the rims, and comprises a waveguide substrate, and a first coupling-in and coupling-out grating group and a second coupling-in and coupling-out grating group, which are disposed on the waveguide substrate, at least some gratings in the first coupling-in and coupling-out grating group and the second coupling-in and coupling-out grating group being located on the same side of the waveguide substrate, and the gratings located on the same side of the waveguide substrate at least partially overlapping to form a composite grating.