. . "non-prismatic" . "Risley prisms" . "Prism#Reflective prisms" . "prisms" . "Prism" . . "Reflective prisms" . . . "cube-corner prisms" . . . "Prism#In optometry" . . . . . . "PRISM" . . . . . . . . . "blocks" . "trigonal glasses" . "aethereal glut" . . "prism" . "Optical prisms" . . . "six reflections" . "prismatic" . . "Prism glasses" . . . "Prism" . "Prismatic" . "Prism (surveying)" . "prism's" . "optical prisms" .