Periscopic spectacles (Opt.), spectacles having concavo-convex or convexo-concave lenses with a considerable curvature corresponding to that of the eye, to increase the distinctness of objects viewed obliquely.
... who now appeared through the aisles of the tall corn, within range of Tommy's periscopic vision, chortling and boasting to the sober harem that followed him. Suddenly he raised his head; his beady eyes glittered; he hurried greedily toward the crumbs, squawking hoarsely, clucking wildly, like a crude fellow who aspires to be a ... — Frank of Freedom Hill • Samuel A. Derieux
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