The Collaborative International Dictionary of English v.0.48:

glasses \glasses\ n. pl.
   Same as eyeglasses. See eyeglass[1].

   Syn: spectacles, specs, eyeglasses.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

glasses
    n 1: optical instrument consisting of a frame that holds a pair
         of lenses for correcting defective vision [syn:
         spectacles, specs, eyeglasses, glasses]

Moby Thesaurus II by Grady Ward, 1.0:

30 Moby Thesaurus words for "glasses":
   Polaroid glasses, bifocals, blinkers, cheaters, colored glasses,
   contact lens, dark glasses, divided spectacles, eyeglass,
   eyeglasses, goggles, granny glasses, harlequin glasses,
   horn-rimmed glasses, lorgnette, lorgnon, mini-specs, monocle,
   nippers, pair of glasses, peepers, quizzing glass, readers,
   reading glasses, shades, specs, spectacles, sun-specs, sunglasses,
   trifocals