You planning a trip, Mister Kirby? Stein peered at him over a pair of old-fashioned, steel-bowed spectacles which perched on his sharp parrot's beak of a nose.
Stein wore contact lenses instead of glasses. 
mnli hypothesis: Stein wore contact lenses instead of glasses.  premise: You planning a trip, Mister Kirby? Stein peered at him over a pair of old-fashioned, steel-bowed spectacles which perched on his sharp parrot's beak of a nose.