'Periscopic spectacles' definitions:

Definition of 'Periscopic spectacles'

From: GCIDE

Periscopic \Per`i*scop"ic\, a. [Cf. F. p['e]riscopique.] Viewing all around, or on all sides. [1913 Webster]
2. of or relating to a periscope[2]. [1913 Webster]
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. [1913 Webster]