Gadzira shanduro yakaoma zvikuru yemutsara uyu Kune marudzi makuru matatu evashanduri, ayo ose akawanikwa kubva kuFresnel prisms.
Zvechokwadi, shanduro yakaoma zvikuru yemutsara uyu ndeiyi "Kune marudzi makuru matatu evaparadzi, ayo ose akawanwa kubva kuFresnel prisms: the Gottlieb Visual Field Awareness System, the Chadwick hemianopsia lens, uye the EP horizontal lens".