Periscopic /(?)/

Per·i·scop·ic

Periscopic

a.
  1. Viewing all around, or on all sides.
  2. of or relating to a periscope{2}.

Phrases & Compounds
Periscopic spectacles
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.